The document contains questions about electronics concepts and components. It covers topics like registers, photoelectric effect, Hall effect, semiconductors, diodes, transistors, operational amplifiers, and electronic circuits. The questions have multiple choice answers provided at the end in a list format.

1. 1. The register is a
1. Simplified unit of a subtractor
2. Cascaded group of the flip-flop
3. Binary ripple counter
4. Data selector
2. The energy of the photo electron depends upon the following factor
1. Intensity of incident radiation
2. Quality of the photocathode
3. Frequency of incident radiation
4. Type of the incident light source
3. Hall effect is used to determine
1. Magnetic flux
2. Current density
3. Type of semiconductor material
4. All of the above
4. Which one of the following is the thermistor
1. Semiconductor device
2. Microwave device
3. Platinum resistance thermometer

2. 4. Thermo-couple device
5. Silicon is having direct band gap
1. True
2. False
3. No gap
4. None of these
6. Boron is doped in silicon to form
1. P-type
2. N-type
3. Intrinsic
4. None of these
7. The concentration of impurity in doped silicon semiconductor per atom is
1. 1018 b. 1022 c.108 d.10-22
8. Conduction in P-type semiconductor is due to
1. Movement of hole
2. Movement of electron
3. Movement of atoms

3. 4. Movement of electron-hole pair
9. Slope of electrical conductivity Vs temperature in semiconductor is
1. Positive
2. Negative
3. Linear
4. No effect
10. Volt equivalent of temperature of silicon at room temperature (300 deg K) is
1. 0.7V b. 1.1V c. 0.026V d. 16V
Answer
1. b2. c3. d4. d5. a6. a7. a8. a9. b10.
11. Carbon is not used as semiconductor because
1. It does not belong to silicon group
2. It is a good conductor
3. It is not a conductor
4. Band gap is very high
12. In forward bias of P-N junction depletion region

4. 1. Increases
2. Decreases
3. Remains the same
4. Breaks down
13. Knee voltage in diode stands for
1. Reverse break down voltage
2. Saturation voltage
3. Threshold of current conduction
4. Peak inverse voltage
14. An ideal semiconductor diode for an AC input acts like
1. Unidirectional switch
2. Bidirectional switch
3. Cuts off AC part
4. Power booster
15. Reverse saturation current in P-N junction diode is due to
1. Hole conduction
2. Electron conduction
3. Minority carrier conduction
4. Majority carrier conduction

5. 16. In the zener diode the break down in the reverse characteristic current is due to
1. Electrons
2. Hole
3. Electron hole pair
4. Crystal ions
17. The percentage of voltage regulation is defined as
1. V no load " V load r100 / V load
2. V load " V no load r100 / V load
3. V load " V no load r100 / V no load
4. V no load r100 / V load
18. Filtering is effected by shunting the load with a
1. Capacitor
2. Resistor
3. Inductor
4. None of these
19. Without applying the biasing voltage the transistor current would be
1. Maximum

6. 2. Minimum
3. No change
4. Zero
20. In the transistor the doping at the emitter is much larger than the base results in
1. Emitter current entirely of holes
2. Emitter current entirely of electrons
3. Base current is due to electron-hole pair
4. Emitter does contribute carrier which can reach collector
Answers
c11. b12. b13. c14. a15. c16. c17. a18. a19. b20.
21. The largest current carrying component in P-N-P transistor is
1. Electrons
2. Holes
3. Electron hole pair
4. Silicon atoms
22. The circuit shown in the figure represents
1. Rectifier
2. Clamping circuit
3. Clipping circuit
4. Low pass filter

7. 23. Clamping circuit is used for
1. AC to DC conversion
2. Biasing
3. Limiting the amplitude
4. Wave shaping
24. For ideal clipping circuit one should use a diode with cut-in voltage
1. 0.7V b.1.1V c. 0V d. 0.2V
25. The ratio of peak inverse voltage of full wave and half wave rectifier is
1. 1 b. 2 c. 1/2 d. 1/4
26. Which of the following transistor configuration is a power amplifier
1. Common emitter
2. Common base
3. Common collector
4. All of the above
27. In a active mode of a transistor, collector conduction takes place due to
1. Majority carrier

8. 2. Minority carrier
3. Common collector
4. All of the above
28. Common emitter configuration is used for a
1. Current amplification
2. Voltage amplification
3. Current and voltage amplification
4. Charge amplification
29. The transistor configuration where input is emitter and output is collector is called:
1. Common emitter
2. Common base common collector
3. Voltage follower(current gain)
30. Beta of a transistor is given by
1. Ib/Ic b. Ic/Ib c. Ib/Ie d. Ic/Ie
Answers
b21. b22. b23. c24. b25. a26. d27. a28. c29. b30.
31. Germanium transistor is preferred over silicon transistor in the following application
1. High frequency
2. High power

9. 3. Low voltage
4. Power rectification
32. SCR is based on the principle of
1. Voltage regeneration
2. Current regeneration
3. Power regeneration
4. Power rectification
33. The number of clock pulses arriving at the digital counter input, should be in the form of
1. Decimal
2. Binary
3. Octal
4. Hexadecimal
34. In which of the counter the clock input is common to all flip flops
1. Asynchronous counter
2. Synchronous counter
3. Decade counter
4. Down counter

10. 35. Multiplexer helps in which of the following
1. Repetition of similar circuit construction
2. Selecting all the signal at the output at the same time
3. Prevention of constructing similar circuits
4. Increase in the constructional costs due to repetition circuits
36. Full adder for two inputs can be developed with the help of
1. Two half adder on OR gate
2. One half adder and two OR gate
3. An EXOR gate and AND gate
4. Two AND gates and an OR gate
37. The important use of gray code is for a
1. Ripple counter
2. Full adder
3. Encoder
4. Decoder
38. In which of the code only one bit changes at each time
1. BCD
2. Aiken code
3. Excess 3 code

11. 4. Gray code
39. In Johnson code for N bits, the maximum number can be formed is given by an expression
1. 2.N b. 2N c. 2N " 2N d. None of these
40. The active mode of transistor operation is used in log circuits because of its
1. Non linearity
2. Linearity
3. Switching nature
4. High speed
Answers
b31. b32. c33. b34. b35. a 36. a37. c38. d39. b40. a
41. Intermediate frequency in television receiver is
1. 26-46 MHz
2. 1.6-2.3 MHz
3. 455-KHz
4. None of these
42. At absolute temperature, a silicon crystal acts like an insulator because
1. Electrons cannot move through a crystal
2. Electrons are tightly held by other atoms
3. Electrons can break away only by supplying energy

12. 4. All of the above
43. Extrinsic semiconductor is
1. Doped with impurities
2. Exists in the pure state
3. N-type only
4. Only P-type
44. The process of extracting the audio information from the modulated envelope is called
1. Modulation
2. Detection
3. Transmission
4. Oscillation
45. Selectivity of a radio receiver is defined as
1. Ability to reproduce the original frequencies
2. Ability to eliminate wanted frequencies
3. Ability to reject unwanted frequencies
4. Ability to pick up the weak signal
46. Digital counter cannot be used as

13. 1. Clock
2. Timer
3. Event counter
4. Multiplier
47. Distortion in the amplifier is due to
1. Non linearity of the device
2. Inductance presents in the circuits
3. Capacitance
4. Stray effect
48. The purpose of RF amplifier tuning in the radio receiver is
1. To reject all the frequencies
2. To select all the frequencies
3. Only to select required frequencies & amplification
4. To vary the band width
49. The intermediate frequency used in the radio receiver is
1. 455KHz b. 1.6 MHz c. 20 MHz d. 60 MHz
50. The purpose of using tuned circuit between stages in the radio receiver is

14. 1. To increase the selectivity
2. To increase the sensitivity
3. To increase both selectivity and sensitivity
4. To get the detector output
Answers
41. d42. d43. a44. b45. c46. d47. a48. c49. a50.
51. In an amplifier, the frequency characteristic may be divided into how many regions
1. Two b. Three c. Four d. Zero
52. Op.amp. has high input impedance because
1. High band width
2. Differential amplifier
3. Current source at input end
4. Common collector configuration
53. Gain of an OP amp. In inverting mode is "Rf / Rn provided, the OP.amp. has
1. Low output impedance
2. Low input bias current
3. High CMRR
4. High open loop gain

15. 54. Slew rate of an OP.amp.is
1. Change of O/p voltage with time
2. Propagation speed
3. Input RC time constant
4. Off set voltage drift
55. Instrumentation OP.amp. is used in application where
1. Two instrument are to be interfaced
2. Input is very low level signal
3. DC signals are involved
4. Differential signals are involved
56. An OP.amp. integrater will be
1. Capacitor at input
2. Diode at input
3. Diode feed back
4. Capacitor feed back
57. A logarithmic amplifier will have
1. Inductor feed back
2. Diode feed back

16. 3. Resistance feed back
4. Thermistor feed back
58. OP.amp. can be converted into capacitor by
1. Increasing bandwidth
2. Removing feed back
3. Increasing input impedance
4. Positive feed back
59. Comparators are used as
1. Switching device
2. Linear amplifiers
3. Power amplifiers
4. High speed amplifiers
60. Typical output impedance of 741 OP amps. is
1. 0.5 W b. 1 K W c. 1 W d. 75 W
Answers
51. c52. b53. d54. b55. b56. d57. d58. a59. a60. a
61. Typical unity gain bandwidth of 741 OP amps. is
1. 10 MHz b. 100 KHz c. 1 MHz d. 1.5 MHz

17. 62. OP.amp. wein bridge oscillator works when the over all gain is
1. 180 b. 3 c. 1.2 d. 125
63. Important part in a electronic voltage regulator is
1. Error amplifier
2. External pass transistor
3. Reference voltage diode
4. All the above
64. To generate a triangular wave form from a square wave
1. Differentiator is used
2. Integrator is used
3. Logarithmic amplifier is used
4. Clipping circuit is used
65. For multiplying two analog signals which one of the following is used
1. Comparator
2. Hall effect device
3. Gunn diode
4. Tunnel diode

18. 66. Which of the following device is used as an electronic memory element
1. Astable multivibrator
2. Monostable multivibrator
3. Magnetic tape
4. None of these
67. Phase sensitive detector in lock-in-amplifier is used
1. To increase the sensitivity of an instrument
2. To limit the bandwidth
3. To increase the dynamic range of the signal
4. To increase the input impedance
68. In television transmission video signal is
1. Frequency modulated
2. Amplitude modulated
3. Phase modulated
4. delta modulated
69. The Boolean function XYZ + YZ + XZ, after simplification gives
1. X b. Y c. Z d. X+Y+Z

19. 70. Extremely low power dissipation and low cost per gate can be achieved in
1. MOS ICs
2. CMOS ICs
3. TTL ICs
4. ECL ICs
Answers
c61. a62. b63. d64. b65. a6. c7. b68. b69. c70. b
71. Which of the following digital IC families can give maximum fan-out
1. ECL b. PMOS c. HTL d. CMOS
72. A punched card has
1. 22 rows, 90 columns
2. 12 rows, 80 columns
3. 12 rows, 2 columns
4. 8 rows, 128 columns
73. Which one of the following is a 16 bit microprocessor
1. Zilog 80
2. Intel 8085
3. Motorola 6800
4. Intel 8086

20. 74. (0.3125)10 when converted to base 8 gives
1. (0.16)8 b. (0.26)8 c. (0.24)8 d. (0.124)8
75. Excess " 3 code is a
1. Weighted code
2. Cyclic code
3. Error correcting code
4. Self complementing code
76. ASC II code is a
1. Error detecting code
2. Self correcting code
3. An alphanumeric code
4. A weighted code
77. Modulo " 2 addition is represented by
1. f = XY + XY
2. f = XY + XY
3. f = X + XY
4. f = XY + XZ + YZ

21. 78. Which one of the following Boolean identities is correct?
1. XYZ + YZ + XZ = YZ + XZ
2. XYZ + YZ +XZ = XY + XZ
3. XY +XZ = XY + XZ + YZ
4. X + XY = XY
79. SN7410 IC is a
1. Quad 2 input NAND gate
2. Triple 3 input NAND gate
3. Dual M/S J-K flip flop
4. None of these
80. Intel 8085 microprocessor has two registers known as primary data pointers these are
1. Registers V & C
2. Registers D & E
3. Registers H & L
4. None of these
81. Intel 8080 microprocessor has an instruction set of 91 instructions. The op-code to implement the
instruction set should be at least
1. 6 bit b. 7 bytes c. 7 bit d. 8 bit

22. 82. A micro programmed computer can have the following memories in its control memory unit
1. Semiconductor ROM
2. Semiconductor RAM
3. Magnetic RAM
4. None of these
83. In digital circuits parallel operation is preferred because
1. It requires less memory
2. Circuitry is simple
3. It is faster than series operation
4. For None of these of the above reasons
84. SN 7401 IC is a
1. Quad 2 input NAND gate
2. Quad 2 input NAND gate with open collector output
3. Quad single input NAND gate with open collector output
4. None of these
85. What is the binary code of (26)?
1. 11001 b. 10001 c. 11010 d. 10100

23. 86. The basic RS flip flops is
1. A bistable multivibrator
2. A monostable multivibrator
3. An astable multivibrator
4. None of these
87. The input impedance of an operational amplifier is
1. Very small
2. Zero
3. Very high but not infinite
4. Infinite
88. Sn 7411 is
1. OP.amp. monolithic and short circuit protection in-built
2. Two input NAND gate
3. Three input NAND gate with open collector output
4. None of these
89. The output voltage of an operational amplifier is
1. 90 deg out of phase from the input
2. 90 deg out of phase from the input

24. 3. 45 deg out of phase from the input
4. 180deg out of phase from the input
90. The equivalent octal number of (492) is
1. 574 b. 547 c. 754 d. 758
Answers
71. d72. b73. d 74. c75. d76. c77. a78. c79. b80. c81. c82. a83. b84. b85. c86. a87. c88. c89. d90. c
91. The equivalent decimal number for gray code 1011 is
1. 14 b. 13 c. 41 d. 31
92. The output will be only if all inputs go to 1 in case of
1. OR gate b. AND gate c. NAND gate d. NOT gate
93. Which of the following circuits is known as half adder?
1. AND circuit
2. OR circuit
3. Exclusive OR circuit
4. None of these
94. Which of the following memories is used to store variable quantities of the data?

25. 1. RAM b. ROM c. PROM d. EPROM
95. Large scale Integrated (LSI) circuits usually contain
1. Less than 10 gates
2. 10 to 100 gates
3. more than 100 gates
4. more than 1000 gates
96. The Boolean expression A + AB + B on simplification can be reduced to:
1. 0 b. 1 c. A + B d. A + B
97. For realizing a decade counter using flip-flops the minimum number of flip-flops required is
1. 4 b. 5 c. 6 d. 10
98. Which logic family is widely used in SSI & MSI applications?
1. ECL b. DTL c. TTL d. None of these
99. An amplitude modulation detector detects
1. The peak value of the modulation signal
2. The envelop of the modulation signal

26. 3. The peak value of the carrier signal
4. The average value of the carrier signal
100. Microwave (MW) links are generally preferred to coaxial cable for TV transmission because:
1. They have less overall phase distortion
2. They are cheaper
3. Of their greater bandwidth
4. Of their relative immunity to impulse noise.
91. b92. b93. c94. a95. c96. b97. a98. c99. b100. a
(Technical-Electronics-IInd)
1. Resistivity of silicon in ohms cm. is approx. equal to
a. 50 b. 1012 c. 230k d. 10-6

27. 2. Rsistivity ofGermanium in ohms cm. is approx. equal to
a. 50 b. 10-12 c. 50k d. 10-6
3. The number of free electrons/cubic cm intrinsic Germanium at room temperature is approx. equal to
a. 1.5*1010 b. 2.5*1013 c. 1000 d. 5*106
4. The number of free electrons/cubic cm of intrinsic silicon at room temperature is approx. equal to
a. 1.5*1010 b. 2.5*1013 c. 10000 d. 5*106
5. The forbidden energy gap for silicon is
a. 1.1eV b. 067eV c. 0.97eV d. 1.7eV

28. 6. The forbidden energy gap for Germanium is
a. 1.1eV b. 067eV c. 0.97eV d. 1.7eV
7. N type material is formed by the addition of the following (penta valent )atom in n to semiconductor
material
a. Antimony
b. Arsenic
c. Phosphorous
d. Any of the above
8. P type material is formed by the addition of the following [Trivalent] atom tn to semiconductor
material
a. Boron b. Gallium c. Indium d. Any of the above

29. 9. Impurity atoms that produces N type material by its addition in semiconductor is called
a. Donar b. Acceptor c. Conductor d. Insulator
10. Impurity atoms that produces P type material by its addition in semiconductor is called
a. Donar b. Acceptor c. Conductor d. Insulator
11. Dynamic resistance of a diode Rd is if voltage changes is DVd and the current change is D Id
a. D Vd / D Id
b. D Id / D Vd
c. 1 / DVd
d. 1 / D Id

30. 12. Point contact diodes are preferred at very high frequency, because of its low junction
a. Capacitance and inductance
b. Inductance
c. Capacitance
13. Identify the circuit given below
a. AND gate
b. OR gate
c. Rectifier
d. NOR gate
14. Identify the circuit given below
a. AND gate

31. b. OR gate
c. Rectifier
d. NOR gate
15. DC value of a Half wave rectifier with Em as the peak value of the input is
a. 0.318Em
b. 0.418Em
c. 0.518Em
d. 0.618Em
16. Change in Zener voltage of 10V at 100o C if temperature co-efficient is 0.072%o C as
a. 0.54 V b. 0.74 V c. 0.64 V d. 0.14 V

32. 17. If Tc is th e% temperature co of / oC and Vz as zener voltage and T as change in temperature then
the change in zener voltage is
c. 100. Vz. Tc DT
d. None of these of the above
18. PIV for a full wave rectifier, if Em is the peak voltage is
a. Em b. 1.5Em c. 0.636Em d. 2Em
19. Schottky Barrier diodes becomes important at
a. DC level operation
b. Low frequency operation

33. c. High frequency operation
d. None of these
20. Clamping network is the one that will clamp the signal to a
a. Different peak value
b. Different DC level
c. Different polarity level
d. Different RMS level
Answers
1. c2. a3. a4. b5. a6. b7. d8. d9. a10. b11. a12. c13. b14. a15. a16. a17. a18. d19. c20
21. Clipping network is the one that will clip a portion of the

34. a. Input signal without distorting the remaining portion
b. Input signal with distorting the remaining portion
c. Any of the above
d. None of these
22. Transition capacitance Ct of a Varicap diode with Knee voltage Vt, reverse voltage Vr and K, the
constant based on semiconductor material and the construction technique & N dependent on type of
junction is given by
a. 1 / K (Vt + Vr)N/2
b. 1 / K (Vt + Vr)N
c. K / (Vt + Vr)N
d. K / (Vt + Vr)1/N

35. 23. Ct = K / (Vt + Vr)N where Vt Knee voltage, Vr reverse voltage, K manufacturing dependent constant
and N dependent on type of junction, for alloy junction the value of N is
a. 1/3 b. 2/3 c. 1/2 d. 1/4
24. Ct = K / (Vt + Vr)N where Vt Knee voltage, Vr reverse voltage, K manufacturing dependent constant
and N dependent on type of junction, for diffused junction the value of N is
a. 1/3 b. 2/3 c. 1/2 d. 1/4
25. In JFET, the drain current Id is given by (Idss drain – source saturation current Vgs – Gate – source
voltage, Vp the pinch off voltage)
a. Idss[1 – Vp/Vgs]
b. Idss(1 – Vgs/Vp)2
c. Idss[1 – Vgs/Vp)
d. Idss(1 – Vgs/Vp)3/2

36. 26. The shadow mask in colour tube is used to
a. Reduce X-Ray emission
b. Ensure each beam hits its own dots
c. Increase screen brightness
d. Provide degaussing for the screen
27. Indicate which of the following signal is not transmitted in colour TV
a. Y b. Q c. R d. I
28. Another name for horizontal retrace in TV receiver is the
a. Ringing b. Burst c. Damper d. Fly back

37. 29. Another name for the colour sync in the colour TV system
a. Ringing b. Burst c. Damper d. Fly back
30. The HV anode supply for a picture tube of a TV receiver is generated in the
a. Mains transformer
b. Vertical output stage
c. Horizontal output stage
d. Horizontal oscillator
31. The output of vertical amplifier is
a. Direct current
b. Amplified vertical sync pulse
c. A saw tooth voltage

38. d. A saw tooth current
32. In a transistor if Alpha = 0.98, current gain is equal to
a. 29 b. 59 c. 69 d. 49
33. The active region in the common emitter configuration means
a. Both collector and emitter junction is reverse biased
b. The collector junction is forward biased and emitter junction
c. The collector junction is reverse biased and emitter junction is forwared biased
d. Both collector & emitter junction are forward biased
34. The saturation region in the common emitter configuration means that

39. a. Both collector & emitter junction are reverse biased
b. The collector junction is forward biased and emitter junction
c. The collector junction is reverse biased and emitter junction is forwared biased
d. Both collector & emitter junction are forward biased
35. The % of Red, Green & Blue in 100% White Y is given by
a. 30%, 59%, 11%
b. 50%, 30%, 11%
c. 30%, 11%, 50%
d. 33.3%, 33.5%, 38.3%
36. Equalizing pulse width, if H is the Horizontal sync rate
a. 0.64 H b. 0.07 H c. 0.04 H d. 0.16 H

40. 37. In a simple RC network the bandwidth is equal to
a. 1/2 p RC
b. RC / 2
c. 2 C / p R
d. 2 p / RC
38. The time constant of a RC network is given by
a. RC b. C/R c. R/C d. None of these
39. First zero crossing of pulse frequency spectrum occurs at if d is the pulse width, T is the pulse
repetition rate
a. 1/d b. d/T c. T/d d. T

41. 40. The distortion less output characteristic of a network means
a. Constant amplitude and linear phase shift over frequency
b. Linear phase shift and amplitude need not be constant
c. Any amplitude and phase
d. None of these
41. Single sideband means suppressed
a. Carrier
b. Carrier and one side band
c. One side band
d. None of these

42. 42. In an amplitude modulated signal, lower side band frequency is equal to (if the carrier frequency is fc
and modulation frequency is fm)
a. fm + fc b. fc – fm c. fm r fc d. fc / fm
43. Modulation index of the frequency modulation depends on
a. Amplitude & frequency of the modulation signal
b. Frequency and amplitude of carrier signal
c. Carrier frequency
d. None of these
44. The BW of the narrow band FM if modulating frequency is fm
a. 3 r fm b. 2 r fm c. 2.5 r fm d. 10 r fm

43. 45. Reactance tube modulator is known for
a. FM b. AM c. PPM d. PAM
46. Bandwidth and rise time product is
a. 0.35 b. 0.45 c. 0.30 d. 0.49
47. Energy gap, Lg, for Germanium at room temp [300o K] is
a. 0.72eV b. 1.1eV c. 1.53eV d. 0.2eV
48. Volt equivalent of temperature VT, at 116o K is
a. 0.11V b. 0.01V c. 1.16V d. 0.1V
49. Reverse saturation current of a Ge.diode is in the range of

44. a. mA b. uA c. nA d. pA
50. Cut-in voltage V for silicon is approximately
a. 0.2V b. 0.6V c. 0.9V d. 1.1V
Answers
b21. a22. c23. c24. a25. b26. b27. c28. d29. b30. c31. d32. d33. c34. d35. a36. c37. a38. d39. a40. a41.
b42. b43. a44. b45. b46. a47. a48. b49. b50.
51. Every 10o C rise in temp. the reverse saturation current
a. Doubles
b. Halves
c. Triples
d. No change

45. 52. Hall effect with reference to Metal or Semiconductor carrying a current I is placed in a
transversemagnetic field B, an electric field E is induced in
a. Parallel to B
b. Perpendicular to I
c. Perpendicular to both B & I
d. Perpendicular to B
53. 1 eV (electron volt) is equal to:
a. 1.9 r 10-20 J
b. 1.6 r 10-19 J
c. 1.6 r 10-20 J
d. 1.16 r 10-19 J
54. Donar impurity is having a valency of:

46. a. 2 b. 3 c. 4 d. 5
55. Acceptor impurity is having a valency of
a. 2 b. 3 c. 4 d. 5
56. Electron volt arises from the fact that if any electron falls through a potential of 1 volt, its kinetic
energy will
a. Decrease, & potential energy will increase
b. Increase & potential energy decrease
c. Be unaltered & potential energy decreases
d. Increase & potential energy increase
57. Hole is created in a semiconductor material if one of following impurities are added

47. a. Antimony
b. Arsenic
c. Indium
d. Phosphorus
58. Excess electron is created by
a. Boran
b. Gallium
c. Indium
d. Arsenic
59. A snubber circuit is used across the SCR to protect against
a. The di/dt of the anode current

48. b. The dv/dt turn on
c. L.di/dt of load inductance
d. None of these
60. Germanium has the valency of
a. 2 b. 3 c. 4 d. 5
61. Silicon has the valency of
a. 2 b. 3 c. 4 d. 5
62. Hole acts as a free charge carrier of polarity
a. Negative

49. b. Positive
c. Neutral
d. None of these
63. Burst signal in NTSC system is 8 cycles of the frequency of
a. Colour sub carrier
b. Picture carrier
c. Sound carrier
d. None of these
64. Colour sub carrier reference burst is superimposed on the
a. Back porch of the each horizontal sync pulse
b. Front porch of the each horizontal sync pulse

50. c. Front porch of the each vertical sync pulse
d. Back porch of the each vertical sync pulse
65. The law of mass action with reference to semiconductor technology states that the product of free
negative & positive concentration is a constant and
a. Independent of amount of donor and acceptor doping
b. Dependent on amount of donor and independent of the amount acceptor impurity doping
c. Depend on amount of both donor & acceptor impurity doping
d. None of these
66. The snubber circuit used across SCR is a simple
a. R-L network
b. RLC network

51. c. LC network
d. RC network
67. To limit the rate of rise of SCR anode current a small
a. Inductor is inserted in cathode circuit
b. Inductor is inserted in anode circuit
c. Capacitor is inserted in anode circuit
d. Capacitor is inserted in cathode circuit
68. Torque developed by a DC servo motor is proportional to the
a. Product of power and time
b. Product of armature current and back emf
c. Armature voltage and armature current

52. d. Field voltage and field current
69. Proportional Integral control
a. Reduces steady state error but reduces the forward gain
b. Increases the forward gain and reduces the steady state error
c. Increases the steady state error and increases the forward gain
d. None of these
70. Increasing the servo bandwidth:
a. Improves signal to noise ratio
b. Improves speed response and lowers signal to noise ratio

53. c. Improves power output
d. None of these
Answers
b51. a52. c53. b54. b55. b56. b57. c58. d59. b60. c61. c62. b63. a64. a65. a66. d67. b68. b69. a70. b
71. Notch filter is
a. Low pass filter
b. High pass filter
c. Narrow stop band filter
d. Narrow pass band filter
72. In TV Receivers the Electron beam deflection method used is
a. Electro static
b. Electro magnetic

54. c. Magnetic
d. All the above
73. In a line of sight communication the maximum range R in miles between the receiver antenna and
transmitter antenna of height H in feet is approximately
a. R = 1.93 ÖH
b. R = 1.23 ÖH
c. R = 1.53 ÖH
d. R = 2.03 ÖH
74. In wavelength of the 60 MHz carrier frequency is
a. 10 metres
b. 15 metres

55. c. 5 metres
d. 2.5 metres
75. In standard TV receiving antenna the dipole element is
a. 0.5 of the wave length
b. 0.25 of the wave length
c. 1.5 of the wave length
d. 1.0 of the wave length
76. The characteristics of FET are similar to:
a. Triode
b. Tertode
c. Pentode

56. d. Diode
77. Charge coupled device is an array of capacitors whose structure is similar to:
a. Shift register
b. Flip-flop
c. NAND gate
d. Amplifier
78. Operational amplifier characteristics are which of the following:
a. Infinite gain
b. Infinite input impedance
c. Output impedance is zero

57. d. All of the above
79. The typical value of the open loop gain in dB of an amplifier at DC with no feedback is:
a. 90 to 100
b. 80 to 90
c. 0 to 50
d. 50 to 70
80. The 3 dB band width means the frequency at which
a. The open loop voltage gain reduced to 0.707
b. The open loop gain reduced to unity
c. Maximum voltage of a signal is without distortion
d. It is a medium wave band width of radio receiver

58. 81. Rise time of an amplifier is defined as time required
a. To change from 0 to 100 % of its final value
b. To change from 0 to 50 % of its final value
c. To change from 10 to 90 % of its final value
d. To change from 10 to 100 % of its final value
82. High speed amplifier design emphasized on
a. Extremely small bandwidth
b. Very slow response
c. Unity gain bandwidth after 10 MHz
d. None of these

59. 83. Tuned amplifier having the frequency range between
a. 150 KHz – 50 MHz
b. 100 Hz – 100 KHz
c. 100 KHz – 120 KHz
d. 50 MHz – 100 MHz
84. The resonance frequency of a tuned circuit made up of R, L, C is given by
a. 1/2 pÖLC
b. 2 pÖLC
c. 2 p / ÖLC
d. ÖLC / 2

60. 85. The voltage follower can be obtained using operational amplifier
a. Without any feedback
b. Series parallel feedback of unity
c. Parallel feedback
d. Series feedback
86. Fidelity of the amplifier is when
a. It is a linear amplifier
b. It does not add or subtract any spectral components
c. It amplifier each component by the same amount
d. All of the above

61. 87. What would be the output when two input sine waves of frequency 50 KHz and 100 KHz passed
through an amplifier in the medium signal
a. 50 KHz and 100 KHz
b. 100 KHz and 200 KHz
c. 50 KHz and 150 KHz
d. All of the above
88. The important application of Schmitt trigger is
a. To convert slowly varying input voltage to abrupt voltage change
b. To convert abruptly varying input voltage into slowly varying output
c. To change the frequency of the input
d. None of these
89. Meaning of decoding is

62. a. Binary addition
b. Data transmission
c. Demultiplexing
d. Storage of binary information
90. Approximately how many number of gates are incorporated in SSL chip
a. 12
b. 100
c. Excess of 100
d. Excess of 1000
91. The circuit diagram represents which one of the following

63. a. Half adder
b. Full adder
c. Exor gate
d. AND gate
92. Flip flop cannot be called as
a. Bistable multivibrator
b. 1 Bit memory unit
c. latch
d. combinational circuit
93. The important use of low pass filter in power supply is
a. To get the regulation in the output voltage

64. b. To filter out the ripple frequency
c. To increase the current rating
d. To convert AC into DC
94. Binary equivalent of the decimal number 145 is
a. 10010001
b. 1001011
c. 1010001
d. 1100010
95. In which of the following gate the output will be high when all the maintained at high level
a. NOR

65. b. AND
c. NAND
d. EXOR
96. Which of the following definition is true in the De Morgan’s theorem
a. Multiplication symbols are replaced by addition symbol
b. Addition symbols are replaced by Multiplication symbol
c. Each of the terms are expressed in the complementary form
d. All of the above
97. 8421/BCD code fro a decimal number 149 is
a. 0001 0100 1001
b. 10010101

66. c. 10101001
d. None of these
98. Combinational circuit are mainly characterized by
a. Output depends upon the previous state & presents state
b. Output depends upon the input at that particular instant
c. Output depends upon the presents state & the clock state
d. Output does not depends upon the input at all
99. A flip flop is defined as
a. A bistable device with two complementary outputs
b. It is memory element

67. c. It will respond to input and it is a basic memory element
d. All of the above
100. Four bit code is called
a. Nibble
b. Byte
c. Word
d. Register
Answer:-
.71. c72. c73. b74. c75. a76. c77. a78. d79. d80. a81. c82. c83. a84. a85. b86. d87. a88. a89. c
90. a91. a92. d93. b94. a5. b96. d97. a98. b9. d100.a

68. 1. The gray code equivalent of binary 1100 is
a. 1011 b. 1101 c. 1010-and d. 1100
2. A Multiplexer has
a. Multiple inputs and single output
b. Single input and Multiple outputs
c. Multiple inputs and Multiple outputs-ans
d. Multiple inputs for Storage of Data
3. A binary half adder

69. a. Adds two binary digits and produces their sum and carry-ans
b. Adds half the sum to the carry
c. Adds two binary digits and carry from previous addition
d. Adds two binary digits at half the speed
4. An index register in a computer is for
a. Arithmetic and logic functions
b. Storage of results
c. Modifying the address-ans
d. Counting the no of programmes
5. An example of volatile memory is

70. a. RAM-ans b. ROM c. EPROM d. Magnetic tape
6. Barrier voltage in a P-N junction is caused by
a. Thermally generated electrons and holes
b. Diffusion of majority carriers across the junction-ans
c. Migration of minority carriers across the junction
d. Flow of drift current
7. The temperature coefficient of an intrinsic semiconductor is
a. Positive b. Negative-ans c. Zero d. Like metals
8. A silicon transistor has a leakage current 1cbo = 1 ma. If the temp. rises by 50o C the leakage current
will be
a. 30 ma b. 32ma-ans c. 50ma d. no change

71. 9. The noise figure of an ideal amplifier in decibel is
a. 0.5 b. 0-ans c. 1 d. 10
10. The rise time of an amplifier is 200 nsec. Its bandwidth is
a. 70MHz b. 140MHz c. 100MHz d. 1.75Mhz-ans
11. MOSFET operates in
a. Depletion mode only
b. Enhancement mode only
c. Depletion and enhancement mode-ans
d. None of these of the above

72. 12. A device which behaves like SCRs is
a. UJT b. Triac-ans c. MOSFET d. SRD
13. A plate modulated class C RF amplifier produces 100 KW of radiated power at 100 % modulation.
The modulating audio amplifier supplies approximately
a. 25KW b. 33KW-ans c. 50KW d. 66KW
14. A 100 MHz FM carrier, modulated by a 5 KHz sine wave deviates by 50 KHz If the frequency of the
modulating sine wave is doubled, the deviation will
a. Double b. Half c. Quadruple d. Have no change-ans
15. Noise generated by a resistor is dependent on
a. Its Value

73. b. Its temperature
c. Both value and temp-ans
d. None of these
16. A 32 channel 8 bit PCM system samples at 8 KHz rate. The overall bit rate in kilobits per second will
be
a. 2048-ans b. 2000 c. 1920 d. 64
17. Stub matching eliminates standing wave on
a. Load side of the stub
b. Source side of the stub
c. Both sides-ans
d. On the stub

74. 18. A half wave folded dipole has a radiation resistance of
a. 72 W b.50W c. 144W d. 288W-ans
19. Top loading is used in antennas for
a. Decrease in impedance
b. Increase in bandwidth
c. Increase in effective height-ans
d. Decease the height
20. The term critical frequency in Ionospheric propagation is
a. Lowest frequency reflected by Ionosphere
b. Highest frequency reflected by the Ionosphere at vertical incidence-ans

75. c. Lowest frequency reflected by the Ionosphere at vertical incidence
d. Lowest communication frequency possible
21. The cathode ray oscilloscope can be used to measure
a. Frequency b. Time interval c. Voltage d. All the above-as
22. A wein bridge is used for measurement of
a. Resistance b. Capacitance c. Inductance d. Audio frequency-ans
23. The frame rate per second used in India TV is
a. 60 b. 50 c. 25-ans d. 30
24. VHF signals are propagated

76. a. Via the ionosphere
b. Along the ground-ans
c. Through the troposphere
d. By reflection in ionosphere
25. The impedance of a 3 element yagi antenna is around
a. 75W b. 300W-ans c. 50W d. 100W
26. A PIN diode is microwave
a. Oscillator b. Mixer c. Detector d. Switch-ans
27. A transmission line of VSWR 2 has a reflection coefficient

77. a. 0.25 b. 0.5 c. 75-ans d. 0
28. Microwave repeaters are typically
a. 25 b. 50-ans c. 75 d. 100 Kms apart
29. To overcome fading in a ship-to-ship communication system we can efficiently use
a. Broadband Antenna
b. Directional Antenna
c. Space Diversity
d. Frequency Diversity-ans
30. Frequency in the UHF range is propagate by waves of
a. Ground b. sky c. Space-ans d. Surface

78. 31. A duplexer is used to
a. Receive two signals in one antenna
b. Prevent interference between two antenna
c. Mix two signals to the same antenna
d. Allow one antenna for both transmission and reception-ans
32. Strapping is used in a magnetron to
a. Prevent mode jumping-ans
b. Reduce frequency drift
c. Ensure proper bunching
d. Dissipate heat

79. 33. A rectangular waveguide behaves like a filter of
a. Band pass b. High pass-ans c. Low pass d. Band stop
34. The signal propagation time in milliseconds for a geosynchronous satellite is
a. 540 b. 270 c. 135-ans d. 100
35. The silicon solar cell is a
a. Photo conductive
b. Photo emissive
c. Photo voltaic-ans
d. Photo resistive

80. 36. For the national TV and ratio network, INSAT-IB uses
a. 400MHz b. 2.5GHz c. 2.5 and 5GHz d. 4 and 6 GHz-ans
37. A typical fibre-optic detector is
a. Step recovery diode
b. Light emitting diode
c. Avalanche photo diode-ans
d. Field effect transistor
38. A modem is a device used for
a. Digitizing voice data
b. Transmission of data on lines

81. c. Modulating and demodulating signals sent on a line-ans
d. Suppressing noise interference
39. The most effective anti-jamming technique is
a. Frequency hopping-ans
b. Spread Spectrum
c. Frequency synthesis
d. Burst transmission
40. Mono-mode is a term used in
a. Fibre-optics-ans
b. Radar
c. Satellite communication

82. d. Magnetics
41. Monopulse technique is used in
a. Radar-ans
b. Radio relay
c. Data communication
d. Fibre-optics
42. HDLC is a term for
a. Data communication protocol-ans
b. Synchronizing pulses
c. Gain control in receivers

83. d. Error checking
43. A gateway
a. Is a place where radars are connected
b. Permits dissimilar networks to communicate-ans
c. Bifurcates the RF path of a transmitter
d. Is a feeder cable
44. Ethernet is a name of
a. Medium of computer communication
b. Network for computer communication-ans
c. Procedures for computer communication network
d. Software for computer communication

84. 45. If several stations in a network want to use a single channel without interfering with one another,
the technique used is called
a. Carrier sense
b. Phantom-freeze
c. Packet switching
d. Multiplexing-ans
46. In a monolithic IC, resistors are formed from
a. Ceramic materials
b. Copper
c. P-type semiconductor-ans

85. d. Aluminium deposition
47. ICs made by sputtering of materials on a ceramic substrate are called
a. Monolithic b. Hybrid c. Thick film d. Thin film-ans
48. Two coils (inductors) connected in series have a combined inductance of 15mH. When terminals of
one of the coils are reversed and connected to the other, the combined inductance is measured to be
9mH. What is the value of mutual inductance
a. 1.5mH b.3mH c.6mH d.12mH
49. If a parallel LC circuit is excited at frequency less than its resonant frequency, the nature of its
effective impedance is
a. Resistive b. Inductive c. Capacitive d. None of these of these
50. The wave length of 1 Giga hertz frequency signal is

86. a. 10cm b. 30cm c. 3cm d. 1cm
51. Which of the following microwave tubes can be considered as broad band devices
a. Magnetrons
b. Klystrons
c. Reflex klystrons
d. Traveling wave tubes[TWT]
52. Which family of the following integrated circuits has the highest speed
a. DTL b. ECL c. TTL d.CMOS
53. The most important feature of CMOS family of ICs is
a. High speed

87. b. Small size
c. Low power consumption
d. Low input impedance
54. What is the resolution of 8 bit A/D converter if its full scale voltage is 10v
a. 0.02v b. 0.01 c. 0.039v d. 0.078v
55. What value of resistance is to be used in LSB of 4 bit weighted ladder D/A converter if MSB has 10
kW resistor
a. 160k b. 80k c. 240k d. 100k
56. The pulse width of a radar transmitter is 0.6m sec. and the pulse repetition rate is 700 Hz. The
average power measured is 420 watts. What is the peak power
a. 100KW b. 420KW c. 1MW d. None of these

88. 57. The device used for isolating the transmitter and receiver in a radar system is called
a. Diplexer
b. Duplexer
c. Directional coupler
d. None of these
58. “Baud” is
a. Total No. of bits/sec in each character
b. Reciprocal of shortest signal element in a character
c. Duration of a character in data transmission
d. None of these

89. 59. The advantage of Totem pole output stage in TTL ICs is
a. Low output impedance
b. Can sink more current
c. Oscillations avoided
d. None of these
60. The capacitance value of a varactor is controlled by
a. A reverse voltage applied to it
b. A series resistance
c. Varying its supply voltage
d. Current through the device
Answers

90. b50. b51. d52. b53. c54. c55. b56. c57. b58. b59. a60. a
61. Electron volt is equivalent to
a. 3.8 * 10-20 erg
b. 1.602 * 10-12 erg
c. 1.602 * 10-18 erg
d. 1.602 * 10-16 erg
62. The kinetic energy of photo electrons emitted by a photo sensitive surface depends on
a. Intensity of the incident radiation
b. Wavelength of the incident radiation
c. Angle of incident of radiation

91. d. Surface conditions of the surface
63. Flux is expressed in radio-metric system in
a. Lumens
b. Photons
c. Watts
d. Candles
64. In a three-phase bridge rectifier circuit, the ripple frequency is
a. Same as line frequency
b. Twice the line frequency
c. Thrice the line frequency
d. Six times the line frequency

92. 65. Energy stored in a capacitor as a function of voltage is given by
a. CV2
b. 1V2/2C
c. ½ CV2
d. 1V/2C
66. The operational amplifier used in analog computers have usually open loop flat gain approximately
upto
a. 1MHz b. 100MHz c. 10MHz d. 0.1MHz
67. An oscillator of 350 MHz is fed with a pulse of rise time 2 n sec. The rise time of the displayed
waveform is approximately
a. 1 n sec b. 2.2 n sec c. 2.0 n sec d. 1.7 n sec

93. 68. A radar transmits a peak power of 100 KW with pulse width of 1 m sec and a pulse repetition rate of
100 KHz. The average output power of the radar is
a. 100KW b.10KW c. 1000KW d. 50KW
69. The incremental inductance in a coil is due to
a. Saturation
b. Superimposed DC
c. Mutual inductance
d. Change of frequency
70. Microwave tube based on velocity modulation principle is
a. Klystron
b. Magnetron

94. c. Light house tube
d. Traveling wave tube
Answers
61. b62. b63. a64. b65. c66. d67. c68. b69. d70. a71. a72. a73. b74. a75. b76. a77. b78. a79. a80. b
71. Noise output from the receiver decreases uniformly with noise side band frequency for
a. Frequency modulation
b. Amplitude modulation
c. Pulse amplitude modulation
d. None of these
72. In amplitude modulation the maximum permissible modulation index is
a. Unity b. 100 c. infinity d. None of these

95. 73. In frequency modulation the maximum permissible modulation index is
a. Unity b. 50 c.1000 d. no limit
74. In FM transmission and reception, the pre-emphasis and de-emphasis are used to improve the
a. Signal to noise ratio
b. Frequency response of the receiver
c. Frequency response of the transmitter
d. The sensitivity of the transmitter
75. De-emphasis network uses the combination of
a. R-L b. R-C c. R-L-C d. Transformer

96. 76. The usage of micro sec for defining emphasis is a standard practice but this micro sec definition
means
a. 3 dB point of the network means
b. mid point of the network response
c. roll off the network response
d. the stop band ripple of the network response
77. Delayed AGC is applied
a. For all singal strength
b. For singal strength exceeding a specified limit
c. For low singal strength
d. For FM receiver

97. 78. Selectivity means
a. Bandwidth
b. Gain
c. Modulation index
d. None of these
79. Narrow bandwidth broadcast reduces
a. The quality and noise
b. Quality alone
c. Noise alone
d. Quality and intelligibility

98. 80. Squelch means keeping the receiver
a. ON in the absence of carrier
b. OFF in the absence of carrier
c. To remove AGC
d. Increase the AGC
81. Let Z be the series impedance and Y be the shunt admittance of the transmission line, then the
characteristic impedance
a. ÖZY b.ÖY/Z c. ÖZ/Y d.All the above
82. Noise figure of an amplifier is defined as
a. Input SNR output SNR
b. Input SNR / output SNR
c. Output SNR / input SNR
d. Input SNR / gain

99. 83. A broadcast radio transmitter radiates 10 KW power when modulation is 60%. Its carrier power will
be
a. 8.47KW b.8.92KW c. 8.31KW d.10.00KW
84. In AM transmission antenna current is 8 Ampere at zero modulation indexes but increased to 8.93
Ampere when modulated on single sine wave. Then the % of modulation is approximately
a. 70.1% b. 80.1% c. 65.1% d. 10.0%
85. In AM transmission antenna current is 8 Ampere at zero modulation index. At 80% modulation index
the antenna current will be
a. 10.00A b. 8.72A c. 9.19A d. 9.79A
86. If two sine waves are amplitude modulated with modulation index m1 and m2, the effective
modulation index is

100. a. Ö m12/m22
b. Ö m1 m2
c. Ö m12+m22
d. Ö m22/m12
87. If it is transmitted current and Ic is transmitter current at zero modulation index and the transmitted
current at modulation index of m will
a. It = Ic Ö[1+m]
b. It = Ic Ö[1+m2]
c. It = Ic Ö[1+m/22]
d. It = IcÖ1+m2
88. If Rr is the radiation resistance and Rd is the lumped resistance, then the antenna efficiency is given
as –

101. a. (Rr - Rd) / (Rr + Rd)
b. (Rr + Rd) / (Rr – Rd)
c. Rr / (Rr + Rd)
d. Rd / (Rr + Rd)
89. In end fire array, the current
a. Magnitude and phase in each element is the same
b. Magnitude is the same but phase is different in each element
c. Magnitude is different but no phase difference in each element
d. Magnitude and phase are different in each element
90. In a board side array, the current

102. a. Magnitude and phase in each element is the same
b. Magnitude is the same but phase is different
c. Magnitude is different but no phase difference in each element
d. Magnitude and phase are different in each element
91. Beam width of the 2 metre paraboloid reflector at 6 GHz is
a. 4.5o
b. 9.25o
c. 3.5o
d. 7.75o
92. The cut of wave length for TE m, n mode is in a wave guide of dimension a*b is
a. 2/Ö(m/a)2 +(n/b)2

103. b. 2Ö [m/a]2 + [n/b]2
c. Ö(m/a)2 + (n/b)2 /2
d. Ö [m/a]2 + [n/b]2
93. For the standard rectangular waveguide dimension of 4*2 cm the off wavelength for TM11 mode is
approximately
a. 1.788cm b. 3.576cm c. 1.682cm d. 2.546cm
94. In IMPATT diode, the voltage and current are
a. In phase
b. Out off phase by 90o
c. Out off phase by 180o
d. None of these of the above

104. 95. Which of the following statement is true
a. Tunnel diode & IMPATT diode are negative resistance devices
b. Tunnel diode is positive resistance device and the IMPATT diode is negative resistance device
c. Tunnel diode is negative resistance device and the IMPATT diode is positive resistance device
d. None of these of the above
96. In a SSB modulation system with 100% modulation index the power saving will be
a. 5/6 of carrier power
b. 2/8 of carrier power
c. 5/12 of the carrier power
d. ½ of the carrier power

105. 97. In SSB modulation the modulation index is increased from 0.5 to 1.0, then the power will be
increased by
a. 2 times b. 4 times c. 16 times d. 32 times
98. 900 rpm is equal to
a. 94.2 rad/sec
b. 47.1 rad/sec
c. 188.4 rad/sec
d. 16.72 rad/sec
99. Darlington pair is used to
a. Increase the voltage gain
b. Increase the current gain

106. c. Decrease voltage gain
d. Decrease current gain
100. The transfer function of the system shown is
a. G(s) / {1 + H(s)}
b. G(s) H(s) / {1 + G(s) H(s)}
c. G(s) / {1 + G(s) H(s)} d. G(s) / G(s) H(s)-ans
Answers
81. c82. b83. a84. a85. c86. c87. c88. c89. b90. a91. c92. a93. b94. c95. a96. a97. b98. b99. b100. c
2011 BEL Placement Paper:-

107. 1. In which of the following movements ‘Vande Mataram’ was adotped for the first time as a slogan for
agitation?
(A) Revolt of 1857
(B) Partition of Bengal in 1905
(C) Non-cooperation Movement in 1922
(D) Quit India Movement in 1942
2. Who warned Gandhiji not to encourage fanaticism of Muslim religious leaders and their followers?
(A) Agha Khan
(B) AjmaI Khan
(C) Hasan Imam

108. (D) Mohammad Ali Jinnah
3. Which one of the following is not correct about the Congress Session.of Lucknow, 1916?
(A) Ambika Charan Majumdar was not the president of this session
(B) In this session the reunion between the liberal and the extremist was established
(C) Mahatma was apprised the problems of the peasants Champaran for the first time
(D) None of the above
4. Kanpur conspiracy case was against the leaders of?
(A) Khilafat Movement

109. (B) Non-cooperation Movement
(C) Communist Movement
(D) Revolutionary Movement
5. In India “Currency Notes issue system” is based on?
(A) Minimum reserve system
(B) Proportional reserve system
(C) Fixed exchange rate system
(D) Full convertibility system
6. ‘Disguised’ unemployment means?

110. (A) Persons with no jobs
(B) Unemployment among house wives
(C) Unemployment among per sons above 60 years pf age
(D) Employment of more persons in a job which lesser number of persons can perform
7. Which of the following statements are true about the income tax in India?
1. It is a progressive tax,
2. It is a direct tax.
3. It is collected by the Government.
4. It is a proportional tax Select the correct answer from the code given below

111. Codes:
(A) 1 only
(B) 1 and 2 only
(C) 1,2and3only
(D) 2, 3 and 4 only
8. ‘SIDBI’ has been established to-
(A) Finance small scale industries
(B) Finance cottage industries
(C) Finance large scale industries
(D) Finance public sector under takings

112. 9. Gangubai Hangal, who died a few months ago, was a?
(A) Classical singer
(B) Dancer
(C) Painter
(D) Sitar player
10. Deep Joshi has recently been given Raman Magsaysay Award in the category of?
(A) Government service
(B) Public service
(C) Community leadership

113. (D) Emergent leadership
11. The missing number in the following series: 5,10,13,26,29, 58, 61,…Is?
(A) 122
(C) 128
(B) 125
(D) 131
12. If 2 jeans and 3 shirts cost Rs. 4,000 and jeans and 2 shirts cost Rs. 3,500, how much does a jeans
cost?
(A) Rs. 1,500
(B) Rs 1,000

114. (C) Rs. 500
(D) Rs. 2,000
13. Which one of the following expresses error in computer data?
(A) chip
(B) byte
(C) bug
(D) bit
14.Assertion (A) Graphite is a good lubricant. Reason (R) Graphite is good conductor of electricity. Select
the correct answer from the codes given below Codes:

115. (A) Both (A) and (R) are true and (A) is the correct explanation of (A)
(B) Both (A) and (A) are true but (H) is not the correct explanation of (A)
(C) (A) is true but (R) is false
(D) (A) is false but (A) is true
15. Acid rain is caused by pollution ot environment by?
(A) Carbon dioxide and Nitrogen
(B) Carbon monoxide and Carbon dioxide
(C) Ozone and Carbon dioxide
(D) Nitrous oxide and Sulphur dioxide

116. 16. The professional printed circuit board generally use the following as the raw material:
1.Paper base bakelite copper clad sheet
2. Glass epoxy copper clad sheet
3.Tin plated Nylon sheet
4. Silver plated pyrex sheet
17. Many switch contacts use silver as the material because
1. It is a good electrical conductor with low contact resistance
2. Silver does not tarnish
3. It is easily shaped as per requirement

117. 4. It is very hard and does not wear off
18. A resistance of approximate value 85W is to be measured by using an ammeter of range 0-1 A having
a resistance of 20 W and voltmeter of range 0-50V having a resistance of 5000W. Two arrangement for
the measurement are shown in the figure below. Which method would you recommend?
1. Method X
2. Method Y
3. Either X or Y
4. Neither X nor Y
19. The value of capacitance across points A & B in the circuit shown below is (in microfarads)

118. a. .3 b. 1 c. 0.67 d. 0.33
20. It is proposed to fabricate a simple Ohm meter for measuring resistor values. A milliammeter with
an internal resistance of 50 W is available. Choosing a configuration using a 3 V battery, a large
resistance and the ammeter in a loop, the unknown resistor is proposed to be measured by noting the
current initially and then connecting the unknown resistor across the ammeter. If the ratio of the two
current is 2, what is the value of the unknown resistor (rn W ) ?
a. 3000 b. 150 c. 100 d. 50
21.The current I flowing into the branch indicated by an arrow in the circuit shown is equal to
a. 2 Amp b. 0.5 Amp c. 1 Amp d. 0.25 Amp

119. 22. For the circuit shown, the maximum power is delivered to the load resistance RL when the value of
Rg is
a. 2 ohms b. zero c. 10 ohms d. infinity
23. A signal generator is available in the laboratory, which is in good condition except for the attenuator
dial which has got displaced. In order to calibrate this, a high frequency oscilloscope is available. At a
particular setting of the knob an open circuit voltage of 450 mV rms is measured. If the impedance of
the generator is 50 ohms, the setting of the attenuator dial is to be adjusted for
a. 6 dBm b. 1 dBm c. 0 dBm d. 10 dBm
24. The relation Loge (X + Loge (1 + X) = 0 also means that
1. X2 + X + 1 = 0

120. 2. X2 + X - 1 = 0
3. X2 + X + e = 0
4. X2 + X – e = 0
25. The Laplace transform of the function f(t) = cos wt is
1. w/(s2 + w2)
2. s2/(s2 - w2)

121. 3. w2/(s2 + w2)
4. s/(s2 + w2)
26. If a = b = c, one value of X which satisfies the equation
=0 is given by
a. x=a b. x=b c. x=c d. x=0
27. An LC oscillator is being analysed. If the LC tank circuit (with quality factor = Q) is isolated from the
amplifying device, the impedance at the resonant frequency as measured looking into the amplifier will
be

122. 1. Q r [LC]1/2
2. ½ rp r [LC]1/2
3. – Q r[LC]1/2
4. Q r [LC]1/2
28. A battery eliminator is required to be constructed and an assortment of rectifiers, resistors and
capacitors is available. However, the step down transformer available has no center tap. The following
configurations for the rectifier are feasible. The one giving the lowest ripple will be
1. Full wave rectifier

123. 2. Half wave rectified
3. Bridge rectifier
4. None
29. Chokes used in rectifier filter circuits are wound on a core with a small air gap. This is done in order
to
1. Get as high an inductance as possible
2. Prevent saturation of the core
3. Absorb the ripple effectively
4. Prevent loading the transformer
30. An integrated circuit linear regulator is used at the output of a power supply having a ripple of 1 V
rms. Assuming that the IC represents a typical design generally available, the output rms ripple to be
expected will be

124. a.. 0.1 V rms b. 0.1 mV c. 100 mV d. 1.0 V rms
Here are the details of 2011 BEL Placement Paper - II job in Bharat Electronics Limited - BEL
1. Which one of the following is called the ‘metal of future’?
(A) Copper
(B) Iron
(C) Titanium
(D) Aluminum

125. 2. The earliest coins of India were made of ?
(A) Copper
(B) Gold
(C) Lead
(D) Silver
3. The Mongols appeared for the first time on the banks of Indus during the reign of?
(A) Balban
(B) Iltutrnish
(C) Qutubuddin Aibak

126. (D) Razia
4. The first woman ruler of medieval India was?
(A) Chand Bibi
(B) Durgavati
(C) Noorjahan
(D) Razia
5. The Moplah Rebellion (1921) took place in?
(A) Malabar

127. (B) Marathawada
(C) Telengana
(D) Vidarbha
6. Which part of the Constitutions of India has been described as the: Soul of the Constitution ?
(A) Directive principles of State policy
(B) Fundamental rights
(C) Preamble
(D) Right to constitutional remedies
7. The first state to implement the Panchayati Raj System in India was?

128. (A) Uttar Pradesh
(B) Rajasthan
(C) Gujarat
(D) Karnataka
8. Who has the right to seek advisory opinion of the Supreme Court on any question of law?
(A) Prime Minister
(B) President
(C) Any High Court
(D) All of the above

129. 9. Consider the following statements about the Governor of a State
1. He is appointed by the President.
2. He holds office at the pleasure of the President.
3. The executive power of the: State vests in him.
4. Normally he holds office for five years.
Select the correct answer from the codes given below
(A) l and 2
(B) 1,2 and 3
(C) 1,2 and 4
(D) All the four
10. Which one of the following pairs is not correctly matched ?

130. (A) Ahmedabad—Sabarmati
(B) Lucknow —Gomti
(C) Bhubaneshwar—Mahanadi
(D) Ujjain-Shipra
11. Dilwara Jain temple is situated at?
(A) Palitana
(B) Mount Abu
(C) Sonagiri
(D) Girinarji

131. 12. Which one of the following is the biggest shipping canal in the world?
(A) Kiel Canal
(B) Panama Canal
(C) Soo Canal
(D) Suez Canal
13. Where was the battle of Plassey fought?
(A) Karnal
(B) Haldighati
(C) Mysore

132. (D) Bengal
14. Who was the first Vice-President of India?
(A) Dr. S. Radhakrishnan
(B) Dr. Rajendra Prasad
(C) C. V. Raman
(D) Jawahar Lal Nehru
15. What was the reason behind the mutiny of 1857?
(A) Cartridge containing fat

133. (B) Frustration in soldiers
(C) Failure of British Government
(D) Administrative research
16. For VHF interfering waves generated by automobile ignition systems or other electrical equipment
located close to the ground, specify which of the following components of the interfering signal are
significant at receiving locations such as used in the reception of TV signals:
1.Horizontal polarization component
2.Vertical polarization component
3. Both horizontal and vertical polarization components
4. Neither horizontal nor vertical polarization components
17. The ratio of lower frequency limit to the MUF for radio communication at short-wave is generally

134. 1. Smaller at night than in the day time
2. Larger at night than in the day time
3. Same at night and in the day time
4. A maximum during the evening times
18. Two UHF amateur radio antenna placed at the same height and 30 statute miles apart are to be such
that each is on the radio horizon line of the other. The height of the antennas should be
a. 56.25 ft b. 112.5ft c. 150ft d. 225ft
19. A transmitter with a radiated power of 1 KW produces a field strengthof 300 mv/m at a distance of 1
Km from the antenna. If the transmitter power is increased to 50 KW and the vertical directivity of the
antenna is increased by a factor of 1.41, the field strength a the same distance from the antenna is
approximately

135. a. 1.5 V/m b. 2.115 V/m c. 3.0 V/m d. 6.0 V/m
20. The directive gains of non-resonant and resonant wire antennas of equal length are approximately in
the ratio of
a.. 4:1 b. 1.5:1 c. 1:1 d 3:1
21.A simple wire radiator produces a radiation field of intensity 100 mV/m at a distance point 25 Km
away. The field produced (in mV/m) at a point 50 Km away in the same direction is
a. 25 b.50 c. 12.5 d. 100
22. Assuming the plane of polarization of the incoming wave and the plane of the receiving antenna to
be the same, the effective height of the receiving antenna is proportional to

136. 1. Radiation resistance
2. Power gain of the antenna
3. Physical area of the antenna
4. Wavelength, assuming other parameters being same
23. The function performed by the following circuits is
1. General combinational logic
2. Exclusive OR logic
3. Exclusive NOR logic
4. Digital comparator logic

137. 24. Narrow trigger pulses are required to be generated from a square wave pluse train (pulse width =
T). The linear wave shaping circuit would be an RC circuit (time constant = T) with the following features:
1. High pass with T << T
2. High pass with T >> T
3. Low pass with T >> T
4. Low pass with T << T
25. The circuit given below acts as
1. An OR gate
2. An AND gate
3. An inverter
4. A NOR gate

138. 26. In the circuit shown below. if R = 0 and S = 1, the outputs Q and Q' will be
1. Q low, Q' high
2. Both low
3. Q high, Q' low
4. Both high
27. Schmitt trigger buffers are normally used as input buffers to digital logic circuit to achieve
1. Higher isolation
2. Higher fan-in-capability

139. 3. Higher drive capability
4. Higher noise-immunity
28. For a reverse-biased PN junction. If the applied voltage is doubled the junction capacitance
decreases by a factor of 2 ½. Assuming the junction acts as a parallel plate condenser, the average
spacing between the plates changes by a factor of
1. 22 b.2 c. 1/21/2 d. 21/2
29. Many frequency sources use a piezo-electric resonator in the feedback circuit essentially to achieve
a
1. Miniature product
2. Low cost design
3. Stable frequency

140. 4. Large output power
30. A pulse train has the following characteristics:
Peak amplitude = 10 V, Pulse ON time 1 sec
Pulse OFF time = 4 sec
The pulse train is passed through a high pass RC filter with a large time constant. The amplitude of
the positive peak at the output will be
1. .10 V b. 2V c. 4V d. 8V

141. TECHNICAL (100M)
ENG +APTI+REASONING (100M)
1.Ghost interference in TV is Due to?
2. which of the following frequency is not used in TV Broad cast ?
3. % of R,G,B in TV ?
4.one problem on self bias circuit?
5.four question on logic gate ?
6. hexadecimal to decimal conversion?
7.maximum &minimum voltages in TTL circuit ?
8. fanout of TTL circuit ?
9.if VSWR is 1, then |L|=?

142. 10.for maximum power transfer theorem |ZL|=?
11.one question on capacitor filter, rectifier circuit ?
12. three questions on fourier transform ?
13. maximum efficiency achieved in class-A transformer fed power amplifier
14. one question on polar plot ?
15.one question on bode plot?
16. four questions on measurements ?
17.In DSB-SC ,demodulation quadrature null effect occurs when θ=?
18.which of the following is generation of SSB-SC ..........
19.formula for power of FM modulated signal ........
20.n-type semiconductor formed due to si is doped with arsenic
21. 1 byte is equal to 8-bits

143. 22. group of 4-bits used in nibble
23. number of address lines required for 4096x12 ROM..........
24.volatile memory ..........
a) SRAM b)DRAM c)ROM
25.Tachometer is used to measure SPEED
26. the value of K for CLTF ,unconditionally stable
T.F=ks/(s+1)(s2+s+1)
27.determine the centroid for above CLTF?
28.determine the angle of asymptotes ?
29.Hays bridge is used when Q is ?
a) Q<10 b)Q>10 c) 1<Q<10
30. formula for skin depth is ?

144. . Transition capacitance Ct of a Varicap diode with Knee voltage Vt, reverse voltage Vr and K, the
constant based on semiconductor material and the construction technique & N dependent on type of
junction is given by
a. 1 / K (Vt + Vr)N/2
b. 1 / K (Vt + Vr)N
c. K / (Vt + Vr)N
d. K / (Vt + Vr)1/N
Answer : c
2. Ct = K / (Vt + Vr)N where Vt Knee voltage, Vr reverse voltage, K manufacturing dependent constant
and N dependent on type of junction, for alloy junction the value of N is
a. 1/3
b. 2/3

145. c. 1/2
d. 1/4
Answer : c
3. The distortion less output characteristic of a network means
a. Constant amplitude and linear phase shift over frequency
b. Linear phase shift and amplitude need not be constant
c. Any amplitude and phase
d. None of these
Answer : a
4. Single sideband means suppressed
a. Carrier
b. Carrier and one side band

146. c. One side band
d. None of these
Answer : b
5. In an amplitude modulated signal, lower side band frequency is equal to (if the carrier frequency is fc
and modulation frequency is fm)
a. fm + fc
b. fc – fm
c. fm r fc
d. fc / fm
Answer : b
6. The noise figure of a receiver is a measure of:

147. 1. Excess noise generated
2. Bandwidth of the receiver
3. Gain of the receiver
4. Operating frequency
Answer :1
7. The ratio receiver is:
1. Direct detection type
2. Super regenerative type
3. Super heterodyne type
4. None of these
Answer : 3

148. 8. In an amplitude modulation system, the modulation index is dependent upon:
1. Modulating frequency only
2. Carrier amplitude only
3. Modulating signal amplitude only
4. Modulating and carrier amplitudes only
Answer : 2
9. Image rejection mixer is generally used:
1. To reject the unwanted signal
2. To improve signal amplitude
3. To improve noise figure
4. To improve conversion loss

149. Answer : 3
10. The value of a resistor creating thermal noise is doubled. The noise power generated is therefore:
1. Halved
2. Quadrapuled
3. Doubled
4. Unchanged
Answer : 2
11. Ct = K / (Vt + Vr)N where Vt Knee voltage, Vr reverse voltage, K manufacturing dependent constant
and N dependent on type of junction, for diffused junction the value of N is
a. 1/3
b. 2/3
c. 1/2
d. 1/4

150. Answer : a
12. In JFET, the drain current Id is given by (Idss drain – source saturation current Vgs – Gate – source
voltage, Vp the pinch off voltage)
a. Idss[1 – Vp/Vgs]
b. Idss(1 – Vgs/Vp)2
c. Idss[1 – Vgs/Vp)
d. Idss(1 – Vgs/Vp)3/2
Answer : b
13. The shadow mask in colour tube is used to
a. Reduce X-Ray emission
b. Ensure each beam hits its own dots

151. c. Increase screen brightness
d. Provide degaussing for the screen
Answer : b
14. Indicate which of the following signal is not transmitted in colour TV
a. Y
b. Q
c. R
d. I
Answer : c
15. Another name for horizontal retrace in TV receiver is the
a. Ringing

152. b. Burst
c. Damper
d. Fly back
Answer : d
16. Another name for the colour sync in the colour TV system
a. Ringing
b. Burst
c. Damper
d. Fly back
Answer : b

153. 17. The HV anode supply for a picture tube of a TV receiver is generated in the
a. Mains transformer
b. Vertical output stage
c. Horizontal output stage
d. Horizontal oscillator
Answer : c
18. The output of vertical amplifier is
a. Direct current
b. Amplified vertical sync pulse
c. A saw tooth voltage
d. A saw tooth current
Answer : d

154. 19. In a transistor if Alpha = 0.98, current gain is equal to
a. 29
b. 59
c. 69
d. 49
Answer : d
20. The active region in the common emitter configuration means
a. Both collector and emitter junction is reverse biased
b. The collector junction is forward biased and emitter junction
c. The collector junction is reverse biased and emitter junction is forwared biased

155. d. Both collector & emitter junction are forward biased
Answer : c
21. The saturation region in the common emitter configuration means that
a. Both collector & emitter junction are reverse biased
b. The collector junction is forward biased and emitter junction
c. The collector junction is reverse biased and emitter junction is forwared biased
d. Both collector & emitter junction are forward biased
Answer : d
22. The % of Red, Green & Blue in 100% White Y is given by
a. 30%, 59%, 11%
b. 50%, 30%, 11%

156. c. 30%, 11%, 50%
d. 33.3%, 33.5%, 38.3%
Answer : a
23. Equalizing pulse width, if H is the Horizontal sync rate
a. 0.64 H
b. 0.07 H
c. 0.04 H
d. 0.16 H
Answer : c
24. In a simple RC network the bandwidth is equal to

157. a. 1/2 p RC
b. RC / 2
c. 2 C / p R
d. 2 p / RC
Answer : a
25. The time constant of a RC network is given by
a. RC
b. C/R
c. R/C
d. None of these
Answer : d

158. 26. First zero crossing of pulse frequency spectrum occurs at if d is the pulse width, T is the pulse
repetition rate
a. 1/d
b. d/T
c. T/d
d. T
Answer : a
27. Indicated the false statement:
1. HF mixer are generally noisier than HF amplifier
2. Impulse noise voltage is independent of bandwidth
3. Thermal noise is independent of the frequency at which it is measured
4. Industrial noise is usually of the impulse type

159. Answer : 2
28. If the carrier of a 100 percent modulated AM wave is suppressed the percentage power saving will
be:
a. 50
b. 70
c. 100
d. 66.6
Answer : d
29. A balanced modulator produces:
1. The carrier and Two side bands
2. The carrier and one side band
3. Two side bands alone

160. 4. Carrier and a number of side bands
Answer : 3
30. The frequency deviation in FM system is proportional to:
1. Modulating frequency
2. Carrier amplitude
3. Modulating signal amplitude
4. None of these
Answer : 3
31. In FM, the total transmitted power is:
1. Dependent on modulating signal amplitude

161. 2. Dependent on modulating frequency
3. Dependent on modulating index
4. Independent of the above
Answer : 4
32. A quarter wave line when short circuited at the far end behaves like
1. Pure inductor
2. Pure capacitor
3. Parallel tuned circuit
4. Series tuned circuit
Answer : 3
33. The stub line used to match transmission line with a given load impedance is generally

162. 1. Another open circuited line
2. Another short circuited line
3. Quarter wave transmission line
4. Half wave transmission line
Answer : 2
34. The smith chart generally covers a distance of
1. Quarter wavelength
2. Half wavelength
3. One wavelength
4. Twice the wavelength
Answer : 2

163. 35. The component generally used to sample a portion of the energy transmitted in a line is
1. Isolator
2. Circulator
3. Directional coupler
4. None of these
Answer : 3
36. The return loss in a transmission line is a measure of
1. Loss of the line
2. Standing wave ratio
3. Characteristic impedance of the line
4. None of these

164. Answer : 2
37. The antenna can be considered as
1. Matching the source and free space
2. Matching the source to the line
3. Matching the line and free space
4. None of these
Answer : 3
38. The free space impedance is approximately equal to
1. 177 W
2. 277 W

165. 3. 377 W
4. 50 W
Answer : 3
39. The polarization refers to
1. The physical orientation of the radiated wave
2. The directional of propagation of the wave
3. Direction perpendicular to the propagation of the wave
4. None of these
Answer : 3
40. If u & e are the permeability and permittivity respectively the characteristic impedance of the
medium is given by
a. ue

166. b. Öu/e
c. Öe/u
d. Öeu
Answer : 2
41. The power density at distance ‘r’ from an isotropic radiator with transmitted power P is:
1. P/r2
2. P/2 p r2
3. P/4 p r2
4. None of these
` Answer : 3

167. 42. The carrier in an FM system disappears for the lowest modulation index of:
a. 0.5
b. 1.0
c. 2.4
d. 3.5
Answer : c
43. The difference between phase and frequency modulation:
1. Is purely theoretical because they are the same in practice
2. Is too great to make the two systems compatible
3. Lies in the poorer audio response of phase modulation
4. Lies in the different definition of the modulation index
Answer : 4

168. 44. The overall noise figure of two cascaded amplifiers is equal to
1. The algebraic sum of the two
2. The sum of the squares of the two
3. The square root of the product of the two
4. None of these
Answer : 4
45. The noise power output of an amplifier is equal to:
1. KTo BFG
2. KTo FG
3. KTo F/G

169. 4. KTo / FG
Answer : 1
46. The effective noise temperature of an amplifier is equal to
1. (F + 1) To
2. FTo
3. (F – 1) To
4. None of these
Answer : 3
47. The noise figure of an amplifier depends upon
1. Its bandwidth
2. Its gain

170. 3. Its operating frequency
4. None of these
Answer : 4
48. The velocity of electromagnetic wave in a coaxial cable is
1. Equal to the velocity in free space
2. Less than the velocity in free space
3. Greater than the velocity in free space
4. None of these
Answer : 2
49. The standing wave ratio [SWR] in a transmission line:

171. 1. Is proportional to the load impedance
2. Is dependent on the source impedance
3. Is a mis-match between the load and line
4. Is a measure of its power handling capability
Answer : 3
50. The standing wave ratio (SWR) is unity in a transmission line if
1. The load impedance is equal to the characteristic impedance of the line
2. The load impedance is twice that of the characteristic impedance
3. The load impedance is half of the characteristic impedance of the line
4. None of these
Answer : 1

172. 51. The standing wave voltage node along a line repeats at the rate of if L is the wave length
a. L/4
b.L/2
c.L
d.2L
Answer : 2
52. FM modulation becomes equivalent to AM modulation if
1. FM index is greater than 1
2. FM index is equal to 1
3. FM index is very much less than 1

173. 4. FM index less than or equal to 1
Answer : 3
53. S/N improvement of FM over AM, B is the FM modulation index
a. 3B2
b.B
c.2B
d.B/2
Answer : a
54. Picture transmission in TV employs
1. Suppressed carrier modulation
2. Vestigial side band

174. 3. Single side band
4. None of these
Answer : 2
55. Sound transmission in TV employ
1. Amplitude modulation
2. Phase modulation
3. Frequency modulation
4. Pulse amplitude modulation
Answer : 3
56. One of the following is an indirect way of generating FM this is the:

175. 1. Reactance FET modulator
2. Varacter divide modulator
3. Amstrong modulator
4. Reactance bipole transistor modulator
Answer : 3
57. The modulation index of AM wave is changed from 0 to 1. The transmitted power is
1. Un-changed
2. Halved
3. Doubled
4. Increased by 50%
Answer : 4

176. 58. The isotropic antenna is represented by
1. Dipole antenna
2. Rhombic antenna
3. Yagi uda antenna
4. No such antenna exists in practice
Answer : 4
59. The gain of parabolic reflector antenna is proportional to
1. The diameter of the reflector
2. Square of the diameter of the reflector
3. Aperture area of the feed
4. None of these

177. Answer : 2
60. The parabolic reflector antenna are generally used to
1. Provide high gain
2. Provide pencil beam
3. Increase bandwidth of operation
4. None of these
Answer : 2
61. Cassegrain feed is used with a parabolic reflector to
1. Increase gain of the system
2. Increase the bandwidth of the system
3. Reduce the size of the main reflector

178. 4. Allow the feed to be placed at a convenient point
Answer : 4
62. A helical antenna is used for satellite tracking because of its
1. Circular polarization
2. Maneuverability
3. Broad bandwidth
4. Good front – to – back ratio
Answer : 1
63. The discone antenna is
1. A useful direction finding antenna

179. 2. Used as a radar receiving antenna
3. Circularly polarized like other circular antenna
4. Useful as a VHF receiving antenna
Answer : 4
64. Waveguides are used mainly for microwave signals because
1. They depend on straight line propagation which applies to microwaves only
2. Losses would be too heavy at lower frequencies
3. There are no generators powerful enough to excite them at lower frequencies
4. They would be too bulky at lower frequencies
Answer : 4
65. The wavelength in a waveguide

180. 1. Is greater than in free space
2. Depends only on the waveguide dimensions and the free-space wavelength
3. Less than the free space wavelength
4. Equal to the free space wavelength
Answer : 1
66. The dominant mode of propagation is preferres with rectangular waveguide because(indicate false
statement)
1. It leads to the smallest waveguide dimensions
2. The resulting impedance can be matched directly to coaxial lines
3. It is easier to excite than the other modes
4. Propagation of it without any spurious generation can be ensured
Answer : 2

181. 67. The velocity of propagation (group velocity) in a waveguide is
1. Less than the free space velocity
2. Greater than the free space velocity
3. Equal to be free space velocity
4. None of these
Answer : 1
68. A wave can propagate in a waveguide if its cut off wavelength is
1. Greater than the free space wavelength
2. Less than the free space wavelength
3. Equal to be free space wavelength
4. None of these

182. Answer :3
69. The dominant mode in a rectangular waveguide is
a. TE11
b. TE10
c.TE20
d.TM11
Answer : 2
70. The characteristic wave impedance of a waveguide
1. Depends on the mode of propagation
2. Does not depend on the mode of propagation

183. 3. Is same as the free space impedance
4. None of these
Answer : 1
71. A choke flange may be used to couple two waveguides
1. To help in the alignment of the waveguides
2. Because it is simpler than any other joint
3. To compensate the discontinuities at the joint
4. To increase the bandwidth of the system
Answer : 2
72. Frequencies in the UHF range is normally propagated by means of
1. Ground waves

184. 2. Sky waves
3. Surface waves
4. Space waves
Answer : 4
73. As electromagnetic waves travel in free space, only one of the following can happen to them
1. Absorption
2. Attenuation
3. Reflection
4. Refraction
Answer : 2

185. 74. High frequency waves are
1. Absorbed by the F2 layer
2. Reflected by the D layer
3. Affected by the solar cycle
4. Capable of use for long distance communications on the moon
Answer : 3
75. Indicate which one of following terms applies to troposcatter propagation
1. SIDS
2. Fading
3. Fraday rotation
4. Atmospheric storms
Answer : 2

186. 76. When microwave signals follow the curvature of the earth, this in known as
1. Faraday effect
2. Ducting
3. Ionospheric reflection
4. Tropospheric scattering
Answer : 2
77. An ungrounded antenna near the ground:
1. Is unlikely to need an earth mat
2. Acts as a single antenna of twice the height
3. Must be horizontally polarized

187. 4. Acts as an antenna array
Answer : 4
78. One of the following consists of non-resonant antenna:
1. The folded dipole
2. The rhombic antenna
3. The end fire array
4. The broad side array
Answer : 2
79. Balun is:
1. A circuit element to connect balance line to unbalanced antenna or line:
2. A circuit element to connect balance line to balanced line

188. 3. A circuit element to connect unbalance line to unbalanced line
4. None of these
Answer : 1
80. The slotted line is used to measure:
1. Standing wave ratio
2. Load impedance
3. Source impedance
4. None of these
Answer : 1
81. In amplitude modulation Ec ( 1 + m Sin Wmt) Sin Wot, each side band amplitude will be:

189. 1. Ecm/2
2. Ecm
3. Ec/m
4. 2Ec/m
Answer : 1
82. The dominant mode in a circular waveguide is
a. TE01
b.TE11
c.TM01
d.TM11
Answer : 3

190. 83. A ferrite is
1. A non-conductor with magnetic properties
2. An inter metallic compound with particularly good conductivity
3. An insulator which heavily attenuates magnetic fields
4. A microwave semiconductor invented by farady
Answer : 1
84. The maximum power that may be handled by a ferrite component is limited by the
1. Curie temperature
2. Saturation magnetization
3. Line width

191. 4. Gyro magnetic resonance
Answer : 1
85. The isolator is
1. Bidirectional
2. Unidirectional
3. Used to tap the power in a waveguide transmission line
4. Used for None of these of the above
Answer : 2
86. Isolator is generally used:
1. To protect the high power transmitter
2. To protect receiver

192. 3. To protect the antenna
4. To avoid arcing in waveguides
Answer : 1
87. A TR tube is used
1. To protect the high power transmitter
2. To protect receiver
3. To avoid arcing in waveguides
4. For None of these of the above
Answer : 2
88. Rieke diagrams are used to select best operating conditions for

193. 1. TWT amplifier
2. Klystron oscillator
3. Magnetron oscillator
4. Cross field amplifiers
Answer : 3
89. The gain bandwidth product of a microwave transistor FT, is the frequency at which the
1. Alpha of the transistor falls by 3 dB
2. Beta of the transistor falls by 3 dB
3. Beta of the transistor falls to unity
4. Power gain of the transistor falls to unity
Answer : 1

194. 90. The cavity magnetron uses strapping to
1. Prevent mode jumping
2. Prevent cathode-back heating
3. Ensure bunching
4. Improve the phase-focussing effect
Answer : 4
91. The transferred – electron bulk effect occurs in
1. Germanium
2. Gallium arsenide
3. Silicon
4. Metal semiconductor junction

195. Answer : 2
92. One of the following is not used as a microwave mixer or detector
1. Crystal diode
2. Schottky – barrier diode
3. Backward diode
4. PIN diode
Answer : 4
93. SAW devices may be used as:
1. transmission media like stripline
2. filters
3. UHF amplifiers

196. 4. Oscillators at millimeter frequencies
Answer : 2
94. Surface acoustic waves propagate in:
1. Gallium arsenide
2. Indium phosphide
3. Stripline
4. Quartz crystal
Answer : 4
95. A parametric amplifier has an input and output frequency of 2.25 GHz, and is pumped at 4.5 GHz is a
1. Traveling wave amplifier

197. 2. Degenerate amplifier
3. Lower-side band up converter
4. Upper-side band up converter
Answer : 2
96. The negative resistance in a tunnel diode
1. Is maximum at the peak point of the characteristic
2. Is available between the peak and valley points
3. Is maximum at the valley point
4. May be improved by the reverse bias
Answer : 2
97. Microwave links repeaters are typically 50KM apart

198. 1. Because of atmospheric attenuation
2. Because of output tube power limitations
3. Because of Earth’s curvature
4. To ensure that the applied voltage is not excessive
Answer : 3
98. Microwave links are generally preferred to coaxial for television transmission because
1. They have less overall phase distortion
2. They are cheaper
3. Of their greater bandwidths
4. Of their relative immunity to impulse noise
Answer : 1

199. 99. A geostationary satellite
1. Is motionless in space(except for its spin)
2. Is not really stationary at all, but orbits the earth with a 24 hour period
3. Appears stationary over Earth’s magnetic pole
4. Is located at a height of 35800KM to ensure global coverage
Answer : 2
100. The geostationary satellite launched by India are called
1. INTELSAT
2. INSAT
3. COMSAT
4. MARISAT

200. Answer : 2
101. After a target has been acquired the best scanning system for tracking is
1. Nodding
2. Spiral
3. Conical
4. Helical
Answer : 3
102. The Doppler frequency increases as the target
1. Approaches the radar
2. Recedes the radar

201. 3. Moves perpendicular to the beam
4. Does not depend on the target velocity
Answer : 1
103. The Doppler effect is used in (indicate the false statement)
1. Moving target plotting on the PPI
2. MTI system
3. FM Radar
4. CW Radar
Answer : 1
104. Solution to the blind speed problem is to
1. Change the Doppler frequency
2. Vary the PRF

202. 3. Use monopulse
4. Use MTI
Answer : 2
105. The A-scope displays
1. Target position and range
2. Target range but not position
3. Target position but not range
4. Neither range nor position but only velocity
Answer : 2
106. In the colour television system the sub carrier frequency in MHz is approximately

203. a. 3.58
b.4.5
c. 45.75
d. 5.58
Answer : a
107. In television 4: 3 : represents
1. The interlace ratio
2. The maximum horizontal deflection
3. Aspect ratio
4. The ratio of the two diagonals of picture tube
Answer : 3

204. 108. Equalizing pulses in TV are sent during the:
1. Horizontal blanking
2. Vertical blanking
3. The serrations
4. Horizontal retrace
Answer : 2
109. The number of lines per field in Indian television system is:
a. 625
b. 312.5
c. 525
d. 262.5

205. Answer : 2
110. The number of frames in Indian TV system is:
a. 50
b. 60
c. 25
d.30
Answer : a
111. In a TV receiver the colour killer:
1. Cuts off the chromastages during monochrome reception
2. Ensures that no colour is transmitted to monochrome receivers
3. Prevents colour overloading

206. 4. Makes sure that the colour burst is not mistaken for sync pulses
Answer : 1
112. A parametric amplifier must be cooled
1. Because parametric amplification generates a lot of hest
2. To increase bandwidth
3. Because it cannot operate at room temperature
4. To improve the noise performance
Answer : 4
113. If the peak transmitted power in a Radar system is increased by a factor of 16, the maximum
range will be increased by a factor of
a. 2

207. b. 4
c.8
d. 16
Answer : d
114. Telephone traffic is measured
1. With echo
2. By relative congestion
3. In terms of the grade of service
4. In erlangs
Answer : 1
`115. If the antenna diameter in a radar system is increased by a factor of 4, the maximum range will be
increased by a factor of:

208. a. O2
b. 2
c. 4
d. 8
Answer : c
116. A high PRF will (indicate the false statement)
1. Make the returned echoes easier to distinguish from noise
2. Make target tracking easier with conical scanning
3. Increase the maximum range
4. Have no effect on the range resolution
Answer : 3

209. 117. The bandwidth of a radar receiver is inversely proportional to the
1. Pulse width
2. Pulse repetition frequency
3. Pulse interval
4. Square root of the peak transmitted power
Answer : 1
118. If d is the pulse width, T is pulse repetition period and P is the peak power, the duty ratio is
a. T/d
b.P/T
c.P/d
d.d/T

210. Answer : d
119. If d is the duty ratio and P is the peak power in a pulsed transmitter, then the average power is
a. P.d
b. P.2d
c.P/d
d. P/2d
Answer : a
120. If the return echo arrives after the allocated pulse interval
1. It will interfere with operation of the transmitter
2. The receive might be overloaded

211. 3. It will not be received
4. The target will appear closer than it really is
Answer : 4
ROUND 2
1How many of the integers between 25 and 45 are even?
A) 21
B) 20
C) 11
D) 10
E) 9

212. 2 If taxi fares were Rs.1.00 for the first 1/5 mile and Rs.0.20 for each 1/5 miles thereafter, the taxi fare
for a 3-mile ride was
A) Rs.1.56
B) Rs.2.40
C) Rs.3.00
D) Rs.3.80
E) Rs.4.20
3. A computer routine was developed to generate two numbers (X, Y) the first being a random number
between 0 and 100 inclusive, and the second being less than or equal to the square root of the first.
Each of the following pairs satisfies the routine EXCEPT
A) (99.10)
B) (85.9)
C) (50.7)
D) (1.1)

213. E) (1.0)
4. A warehouse had a square floor with are 10,000 sq. metres. A rectangular addition was built
along one entire side of the warehouse that increased the floor by one-half as much as the original floor.
How many metres did the addition extend beyond the original building?
A) 10
B) 20
C) 50
D) 200
E) 500
5. A digital wristwatch was set accurately at 8.30 a.m. and then lost 2 seconds every 5 minutes. What
time was indicated on the watch at 6.30 p.m. of the same day if the watch operated continuously that
time?
A) 5:56

214. B) 5:58
C) 6.00
D) 6:23
E) 6:20
6. A 5 litre jug contains 4 litres of a saltwater solution that is 15 percent salt. If 1.5 litres of the solution
spilts out of jug, and the jug is then filled to capacity with water, approximately what percent of the
resulting solution in the jug is salt?
A).5%
B) 9.5%
C) 10.5%
D) 12%
E) 15%
7. It was calculated that 75 men could complete a piece of work in 20 days. When work was scheduled
to commence, it was found necessary to send 25 men to another project. How much longer will it take
to complete the work?

215. 8. A student divided a number by 2/3 when he required to multiply by 3/2. Calculate the percentage of
error in his result.
9. A dishonest shopkeeper professes to sell pulses at the cost price, but he uses a false weight of 950gm.
for a kg. His gain is …%.
10. A software engineer has the capability of thinking 100 lines of code in five minutes and can type 100
lines of code in 10 minutes. He takes a break for five minutes after every ten minutes. How many lines of
codes will he complete typing after an hour?
11.There are total 15 people. 7 speaks french and 8 speaks spanish. 3 do not speak any
language. Which part of total people speaks both languages?
Ans: 1/5

216. 12. A jogger wants to save ¼th of his jogging time. He should increase his speed by how much %age?
Ans: 33.33 %
13. a is an integer. Dividing 89 & 125 gives remainders 4 & 6 respectively. Find a ?
Ans: 17
14. A Child is saying numbers 1, 2, 3, 4. When he says 1 Another child puts white marble in a box. On
saying 2 he puts Blue marble and on saying 3 he puts red marble. When child says 4 other child take out
white and blue marble. Child says some no. in a sequence then questions are based on the no. of
marbles in the box. Like this
1,1,2,3,1, 4, 1,1,3,2,2,4,111…

217. a) Find the no. of Blue marble in the box
b) Find the no. of White
c) No. of red marbles
15 A man crosses a circle of perimeter 35 m in 44 sec and he runs a hexagon of 42 m side. In how many
second he finishes the complete perimeter of the hexagon?
16. A+b do a work in 6 days. A+c do the work in 10 days, c+a in 7.5 days. How manydays will it take for
a+b+c to do the work and also find the number of days required by a alone?
17. Complete the series 7 49 56 392………….

218. 18. A regular hexagon is inscribed in a circle. What is the perimeter of the hexagon in relation with the
radius of the circle?
19. A circular path has a perimeter of 120m.a, b,c travel at 5 7 15m/s respectively. They start
simultaneously. At what time do they meet next?
20. Totally there are 12 pipes. Some pipes fill the tank and some empties the tank (data will be given). If
all the pipes are opened simultaneously when will the tank be filled?
21.Average age of 24 students is 36. When the age of teacher is added the average age is increased by 1
year. What is the age of the teacher?
22. Water and milk are mixed in the ratio 2:1,5:3 and 9:4.when all the mixtures of equal volume are
mixed together what is the ratio water and milk in the resulting solution?
23. Average rate of five orange and four apples is 12 and 7 orange and 8 apples are 86. Find the total
rate of 24 orange and 24 apples.

219. 24.In how many ways the letters in the word MANAGEMENT can be arranged such that A’s does not
come together?
25. A give B a start of 20 sec and leads by 20m. When he starts off 25 sec he finishes at the same
time. What is the speed of A. (wordings not sure)?
25) A father has six children .all the children are born at regular intervels.if the sum of their ages of all
the children and father is 186. calculate the age of the elder son, when the younger sons age is 3?
26. A man was engaged on a job for 30 days on the condition that he would get a wage of Rs. 10 for the
day he works, but he have to pay a fine of Rs. 2 for each day of his absence. If he gets Rs. 216 at the end,
he was absent for work for ... days.
27. A contractor agreeing to finish a work in 150 days, employed 75 men each working 8 hours daily.
After 90 days, only 2/7 of the work was completed. Increasing the number of men by ________ each
working now for 10 hours daily, the work can be completed in time.
28. Rs 50000 is divided into two parts

220. One part is given to a person with 10% interest and another part is given to a person with 20 %
interest.At the end of first yearn he gets profit 7000 . Find money given by 10% ?
29. Time shown by a watch is 2.20 .Find the angle between them ?
30. Avg cost of 5apples+4 mangoes=rs.36
Avg cost of 7 apples + 8 mangoes=rs.48
Find total cost of 24 mangoes and 24 apples?
TECHNICAL (100M)
ENG +APTI+REASONING (100M)
1.Ghost interference in TV is Due to?

221. 2. which of the following frequency is not used in TV Broad cast ?
3. % of R,G,B in TV ?
4.one problem on self bias circuit?
5.four question on logic gate ?
6. hexadecimal to decimal conversion?
7.maximum &minimum voltages in TTL circuit ?
8. fanout of TTL circuit ?
9.if VSWR is 1, then |L|=?
10.for maximum power transfer theorem |ZL|=?
11.one question on capacitor filter, rectifier circuit ?
12. three questions on fourier transform ?
13. maximum efficiency achieved in class-A transformer fed power amplifier

222. 14. one question on polar plot ?
15.one question on bode plot?
16. four questions on measurements ?
17.In DSB-SC ,demodulation quadrature null effect occurs when θ=?
18.which of the following is generation of SSB-SC ..........
19.formula for power of FM modulated signal ........
20.n-type semiconductor formed due to si is doped with arsenic
21. 1 byte is equal to 8-bits
22. group of 4-bits used in nibble
23. number of address lines required for 4096x12 ROM..........
24.volatile memory ..........
a) SRAM b)DRAM c)ROM
25.Tachometer is used to measure SPEED

223. 26. the value of K for CLTF ,unconditionally stable
T.F=ks/(s+1)(s2+s+1)
27.determine the centroid for above CLTF?
28.determine the angle of asymptotes ?
29.Hays bridge is used when Q is ?
a) Q<10 b)Q>10 c) 1<Q<10
30. formula for skin depth is ?
1. Forbidden gap of Ge diode is…?
Ans: 0.65V

224. 2. N-Type Semiconductor will be formed by adding which type of impurities?
Ans: Pentavallent impurities.
3. Which of the following are pentavallent impurities?
Ans: Antimony & Arsenic.
4. Find output voltage Vo….?
Ans: Vo= -RC dVi/dt.
5. Circuit of Astable multivibrator is given and asked to find which terminal(s) has to be grounged…?
6. Ohms law……?
Ans: J= σE
7. Angstorm(Å )=……?
Ans: 10^-10m
8. Unit of conductivity…?
Ans: Ω-m.

225. 9. How can an amplifier gives more o/p than i/p, don’t u think its a violation of law conservation of
energy…?
Ans: dc supply used for active devices hence law is not violated.
10. A question based on IC-555…?
11. Which junction is formed by recrystallization..?
12. Calculate Doppler Frequency…?
13. By increasing PRF of the Radar, what is effect on error in unambiguous range…?
14. 2 Questions based on Radar Classification..?
15. Which of the following is the analog modulation.?
a)PAM b) Delta c)PCM d)….
16. Which of the following is digital modulation.?
a)PAM b) Delta c)….
17. A FM broadcast station having Frequency deviation of 100MHz, Calculate Modulation Index..?

226. 18. A Question based on the definition of Geo-synchronous orbit..?
19. Howmany number of Geo-synchronous satellites are required to cover entire Globe..?
Ans: 3
20. Calculate cutoff frequency of TE10 mode… wider dimension is given as 2.5cms..?
21. Directivity is same as…..?
a) Same as Directive gain b) greater than directive gain c) smaller than directive gain d)None
22. DB is expessed……
a) Power ratio b)voltage level c) Current level d)None
23. The wave length of a wave travelling in wave guide is
a) less than free space b) more than free space c) equal to free space
24. Which of the following is not an omnidirectional antenna..?
25. Which antenna is used for TV broadcasting..?

227. Ans: Yagi-uda antenna..
26. The standard time taken to scan one Horizontal line in TV as per FMCC standard..?
Ans: 64µsec.
27. A question based on the TV picture tube…?
28. If impedance in delta n/w is purely inductive then impedance in star n/w will be
a) purely capacitive b) purely inductive c) resistive
d) Either capacitive or inductive depends on its magnitudes.
29. what is Laplace transform of integral of f(t)..?
30. Laplace transform of c1f(t)+c2f(t)….?
31. Area under unit impulse signal is…?
Ans: 1
32. The next no’s of (777)8 & (1111)2 are….?

228. Ans: (1000)8 & (10000)2
33. In floating point representation, 853.29 can be represented as _____?
34. Shifting left and putting a zero in LSB is equivalent to…..?
Ans. multiply by 2.
35. If we require o/p equal to i/p then which flip-flop has to be used .?
a) D-Flipflop b) D-Latch c)…
36. Which of the following gate is used for making inverter..?
Ans: NAND gate
37. In which technology the no. of gates are more than 12…?
Ans: MSI.
37. For an n-bit microprocessor the value of n is based on…?
a) Address bus b) Internal data bus c) External data bus d) None.
38. Address bus length of 80286 microprocessor is…?

229. 39. One more question based on microprocessor…
40. Minimum RAM memory required in windows-95.?
41. which operating system is prefer for Servers…?
a). Windows 98 b). Windows NT
42. A question on Logic Gate families…?
Amp
43. It is a
o/p
a). Feedback Network b). Oscillator C)………
44. A Qstn on Rise Time from Control systems…

230. 45. A Qstn based on stability from control systems..
46. In a feedback system the error signal is….?
Ans: a)r+s b) r-s c) r±s d) None
47. Group velocity of a wave
48. Which of the mode the wave propagates in the Free Space………..?
49. In which amplifier current flows for less than half cycle…?
a)class-A b) class-B c)class-AB d) class-C
50. 1Qstn based on Routh Hurwitz criterian..?
Coming to Aptitude part….
1. A passage was given n 5 Q’s based on that….

231. 2. 3 Q’s from idioms & phrases….
3. Fill in the blanks….
4. 5 simple Q’s on a puzzle….
5. 10 Q’s on data interpretation…
6. 5 qstns from secrecies (Four rules were given and asked find which series follows which rule....)
there were total of 150 ques and a time of 2.30 hrs. for ece branch.
q-1 based on passege and 6 ques.
q-7-8 synonyms
q 9-10 fill in the blanks
15-20 a table was given and we have to ans based on that
21-25 again simple ques based on puzzle test.
26-30 simple ques based on series like
four rules were given and we have to identify what type of rule is being followed by series.
now technical part started
based on all subjects ie. analog electr,digital elec,analog n digital comm.,op-amp,radar,s-xform,con
system,microwave .few ques r like this
what is laplace xform of integral of f(t).
one based on xfer func
lap xfom of c1f(t)+c2f(t)
by adding pentavalent imp which semi cond is formed
commonly used trivalent imp.

232. if a -ve feedbak is used then what is o/p r+s or r-s
1 based on routh hurwitz
unit of conductivity
angstorm=?10^-10 m ,etc
which of the foll is analog modln
which of the foll is digital modln tech
amplify gives more o/p than i/p isnt it violation of law of enegy
Ans. it use dc power so law is not violated
based on ic-555
antena used for tv
name of satelite use for earth resources
radar ques based on prf,radar eqn,
which is tracking radar
standard time taken in tv scan
alpha of plumbicon tube
gauss law
2-3 ques on microprocessor
which window is used for n/w
min ram reqd in 95 window
seq after(777)8 n (1111)2 here 8 n 2 r base in digi elec.
853.29 can be represented as _____ in float represent
shifting left is equalent to---------ans. multiply by 2
if we req o/p eual to i/p then which flip-flop wii be used
gate use for making inv-----ans nand
area under unit impulse

233. in whic amp curr flows for full cycle---a,ab,c
whic antena is not omnidir
many ques from microwave
which jun is formed by recrystallization
at microwave freq ohm law is
a)J=sigmaE b)J=sigma/E
Time: 2:30hrs
Aptitude: 5qns from passage,10 qns from Table(data given), 5qns from Grammer(fill in the appropriate
word) n 10qns from logical reasoning.
Technical:
1. Antennas: Antenna lenths, types(vhf,uhf,yogi-gudi n other)
2. Satellites: Basics on Satillites, Satillite positions, Distance problems, Geo-synchronous Satillites

234. 3. Rader : Basics on Raders, Tracking Raders, FW-CM Raders, MTI Raders
4. Microprocessors: 80286, Data n Adders lines(1-2 qns)
5. Networks : Resonance Frequency, Y-Delta problems, Nodal n Mesh Analysis, RLC n/w, power
Calculations(p=v^2/R=I^2R=VI)
6. Control Systems : Transfer Function, Routh-Hurwitz Crierion
7. Op-amps : R and C connected op-amp o/p
8. Timers: IC(4000,4001,7485)
9. Capacitance n Inductance Formulas and its problems,Conductivity
10. Basic Electronics: p-n junction, FET, Oscillators
11. Electromagnitics : m(mue),mr, Maxwell’s equation, J= (Sigma)*E, Divergence, Wave guides.
12. 1-5 qns from Basics of normal operating systems(windows,unix,win98) n Control Networking
13. Digital Electronics : Flip-flops(j-k,T,D), Logic Gates
14.Communications : Detectors,S/N ratio,
a) Pulse Analog :

235. PAM :Pulse Amplitude Modulation
PWM :Pulse Width Modulation
PPM : Pulse Position Modulation
b) Pulse Digital :
PCM : Pulse Code Modulation
DPCM: Differential Pulse Code Modulation
DM : Delta Modulation
This bit of information is very helpful to you.Dont depend on last year topics.BEL cahanged their pattern
every year. You vl prepare all topics clearly as in our syllabus.
Time is very important rather than other matters in examination hall…….
2 and half an hour = 150 Minutes = 9000 seconds……….Every Second is valuable n Every Minute is
important……..This is very easy for hu prepared GATE n IES…………

236. All the Best Friends
“SUCCESS or FAILURE is in your hands only”