Electronics Mechanic Question Paper MCQ Book PDF Free Download for ITI Trade Theory CBT 1st, 2nd year Exam, Apprentice test, CTS AITT, ISRO, DRDO, NAVY, ARMY, Naval Dockyard, Tradesman, Training Officer, Instructor, RRB ALP CBT, Railway Technician, CEPTAM, BRO, PWD, PHED, Air India, BHEL, BARC, IPSC, CTI, HSFC, GSRTC, GAIL, PSC, Viva, Tests, Quiz & all other technical competitive exams.

2. Electronics Mechanic ITI Question Paper MCQ
Contents
ITI Question Bank (1st
Year)...............................................................................................................................................2
ITI Question Bank (2nd
Year)............................................................................................................................................27
ITI Question Bank (1st Year)
1. What are gases and liquid gases classified into?
a) Class A fire b) Class B fire
c) Class-C fire d) Class-D fire
Ans. c
2. Which type of toe is used to protect the feet from crushing while shifting equipment?
a) Steel toe caps
b) Plastic toe caps
c) rubber toe caps
d) Leather toe caps
Answer: a
3. Which fire extinguisher is used to extinguish Class C type fire?
a) Form type b) Water jet c) Dry powder d) Carbon dioxide
Answer- c
4. What is the shape of mandatory signs?
a) square b) round c) triangular d) rectangular
Answer- b
5. What materials are used to make instrument cabinets?
a) wood b) plastic c) hard rubber d) metal sheet
Answer- d
6. What is the size of the warning sign board?
a) square b) round c) triangular d) hexagon
Answer- c
7. In which category of fire are metals included?
a) Class A b) Class -B
c) Class-C d) Class-D
Ans. d

3. 8. What is the shape of the prohibition sign?
a) square b) round
c) triangular d) rectangular
Answer- b
9. Which step is followed to treat a person suffering from electric shock?
a) Provide water
b) keep the victim cool
c) cover the victim with a coat
d) Move the victim to a well ventilated area
Answer- d
10. Which angle is checked by try square?
a) 450
b) 60 0
c) 750
d) 900
Ans. d
11. What is the use of screw driver?
a) holding the screw
b) tightening and loosening screws
c) tighten or loosen the bolts
d) Tighten or loosen the rivet
Answer- b
12. What is the maximum size of drill bit used in electric hand drilling machine?
a) 0.35mm
b) 1.5mm
c) 3.5mm
d) 6.5mm
Ans. d
13. Which tool is used to join taper type funnels?
a) Vice
b) Angle steel
c) Hatchet Stake
d) Blow Horn Steak
Answer- d

4. 14. What is indicated by x in the operation of a saw?
a) direction of cut b) direction of pressure
c) reverse position of the blade d) direction of movement of the blade
Answer- b
15. What is the purpose of a wood rasp file?
a) 900
Corner
b) Metal cutting
c) Finishing flat edges
d) preliminary rough work
Answer- d
16. What is the first step to save a person in electrical contact?
a) break the contact
b) call the doctor
c) Switch off the power supply
d) Pull the person away from electrical contact
Answer- b
17. What causes electrical fire?
a) Deviation b) Open circuit c) Overloading d) Proper earthing
Answer- c
18. What is the meaning of information mark?
a) Toxic hazard b) Wear respirator c) First aid point d) Explosion hazard
Answer- c

5. 19. Which artificial respiration method should be avoided in a person with abdominal injury?
a) Schaefer method
b) Mouth to nose method
c) Nose to mouth method
d) Mouth to mouth method
Answer- a
20. What is the cause of injuries while lifting weights?
a) Heavy load
b) falling objects
c) object to measure weight
d) Wrong lifting technique
Answer- d
21. How is overlapping of excess sheet metal causing bulges at seams and edges prevented?
a) Wooden hammer
b) Notch
c) L-angle
d) square steak
Answer- b
22. What is the effect of electric shock at very low voltage level (less than 40v)?
a) Fibrillation
b) muscle contact
c) Burning of the skin
d) unpleasant tingling sensation
Answer- d
23. The electrical conductivity of gold is
a) 56%
b) 67%
c) 94%
d) 100%
Ans. b
24. What is the unit of electric charge?
a) volt b) heartz
c) Ampere d) Coulomb
Answer- d

6. 25. Which material has eight electrons in the valence layer?
a) Insulator
b) Conductor
c) Semiconductors
d) Intrinsic semiconductor
Answer- a
26. Which material is used as an electrical insulator?
a) Gallium
b) porcelain
c) Aluminum
d) Germanium
Answer- b
27. Which electrical parameter opposes the flow of electrons?
a) Power
b) Voltage
c) Current
d) Resistance
Answer- d
28. Single strand wire is called?
a) Flexible wire
b) Twisted wire
c) Hook up wire
d) multi strand wire
Answer- c
29. What is the purpose of the cover provided over electrical conductors?
a) increase the current flow
b) reduce the current flow
c) reduction in voltage rating
d) Protection against the weather
Answer- d
30. Which core is used in intermediate frequency transformer?
a) steel b) nickel
c) Cobalt d) Ferrite
Answer- d

7. 31. Which materials conduct electricity?
a) Mica
b) Paper
c) glass
d) Copper
Answer- d
32. How many electrons are there in a pair of electric charge?
a) 6.25 x 108 electrons
b) 6.25 x 1012 electrons
c) 6.25 x 1016 electrons
d) 6.25 x 1018 electrons
Answer- d
33. What is the movement of electrons through a conductor in a particular direction called?
a) Resistance
b) Inductance
c) Conditions
d) electric current
Answer- d
34. Which metal has very good conductivity in electric current?
a) Gold
b) Copper
c) silver
d) Aluminium
Answer- c
35. What is the size of standard wire gauge?
a) Square metal disk
b) Circular metal disk
c) Cylindrical glass disk
d) Rectangular plastic disk
Ans. b
36. Which formula is used to find conductivity?
a) Q/V b) I x R
c) V/I d) I/V
Ans. d

8. 37. How does the insulation coating remain undamaged even when the wire is bent?
a) due to wire resistance
b) due to high current flow
c) due to the elastic properties of the insulation
d) due to the strength of the wire material
Answer- c
38. What is the purpose of standard wire gauge?
a) measure the current
b) measure the voltage
c) Measure the diameter of the wire
d) measure the insulation of the wire
Answer- c
39. Which electrical parameter is measured by Megger?
a) Current
b) Voltage
c) insulation resistance
d) Recurring
Answer- c
40. Which energy is converted into electrical energy in hydroelectric stations?
a) Heat energy
b) light energy
c) Chemical energy
d) mechanical energy
Answer- d
41. Which instrument is used to measure the size of wire?
a) Try Square
b) Steel rule
c) filler gauge
d) standard wire gauge
Answer- d
42. Which parameter of wire is directly proportional to current carrying capacity?
a) wire resistance b) passing current
c) Shape of the conductor d) Diameter of the conductor
Answer- d

9. 43. What is the effect on current flow with increased diameter of conductor?
a) resistance increases
b) resists more current
c) high voltage drop
d) allows higher current flow
Answer- d
44. What is the name of the pair of metal strips used in a battery cell?
a) Cathode
b) Electrolyte
c) Electrode
d) Carbon rod
Answer- c
45. Which electrolyte is used in lead acid batteries?
a) Zinc Chloride
b) Sulphuric acid
c) alkaline solution
d) Potassium hydroxide
Answer- b
46. What is the rated output voltage of a silver oxide cell?
a) 1.0VDC
b) 1.5VDC
c) 2.5VDC
d) 4.0VDC
Ans. b
47. Which material is used for the negative terminal of alkaline manganese dioxide battery?
a) Zinc
b) Lithium
c) Cadmium
d) nickel hydride
Answer- a
48. What is the rated voltage of a single cell in a lead acid battery?
a) 1.5V b) 2.0V
c) 2.2Vd d) 12V
Ans. c

10. 49. What is the range of current rating of lead acid batteries used in automobiles?
a) 5 to 10 Amps
b) 10 to 25 Amps
c) 2.5 to 4.5 Amps
d) 100 to 400 Amps
Ans. d
50. What is the colour of the positive electrode of a fully charged lead acid battery?
a) Red colour
b) Grey colour
c) reddish brown colour
d) Spongy grey colour
Answer- c
51. What is the specific gravity of concentrated sulfuric acid?
a) 1.175
b) 1.245
c) 1.835
d) 1.945
Ans. c
52. What is the total voltage of six 1.5V cells connected in series?
a) 3VDC
b) 6VDC
c) 9VDC
d) 12VDC
Ans. c
53. What is the percentage of sulphuric acid in the electrolyte used for lead acid batteries?
a) 12%
b) 25%
c) 27%
d) 40%
Ans. c
54. What is the electrolyte level maintained above the top of the plates in a lead acid battery cell?
a) 2mm to 4mm
b) 5mm to 8mm
c) 10mm to 15mm
d) 16mm to 25mm
Answer- c

11. 55. What is the lowest voltage level for discharging a lead acid battery?
a) 1.2V
b) 1.5V
c) 1.7V
d) 1.85V
Ans. c
56. What is the additional percentage of power provided by Lithium Ion compared to NiMH battery
a) 0.15
b) 25%
c) 40%
d) 60%
Ans. c
57. Which battery is made from non-toxic materials?
a) Lithium Ion
b) Lithium polymer
c) nickel cadmium
d) nickel metal hydride
Answer- d
58. Why load testing is done in lead acid batteries?
a) Test the dimensional accuracy
b) Verify rated power delivery
c) measure the rated output voltage
d) Check for power loss in the battery cells
Answer- c
59. What is the full form of PMMC?
a) Parallel Magnet Moving Coil meter
b) Position Magnet Moving Coil meter
c) Principle Magnet moving coil meter
d) Permanent Magnet Moving Coil meter
Ans. d
60. What type of waveform is produced in a Schmitt trigger circuit?
a) sine wave
b) Square wave
c) Saw tooth wave
d) triangular wave
Answer- b

12. 61. Which band is used for UHF in the international telecommunication system?
a) Band 4
b) band 6
c) Band 9
d) Band 11
Answer- c
62. Which parameter is measured by a multimeter?
a) Voltage
b) Energy
c) Recurring
d) Time period
Answer- a
63. Which torque is used in PMMC meter movement?
a) low torque
b) high torque
c) medium torque
d) insufficient torque
Answer- c
64. Which instrument is used to measure resistance, capacitance and inductance?
a) LCR bridge
b) Wayne Bridge
c) Kelvin Bridge
d) Wheatston Bridge
Answer- a
65. In which analog meter battery is provided?
a) Ammeter
b) voltmeter
c) Ohm meter
d) Watt meter
Answer- c
66. Which meter uses a moving coil for measurement?
a) LCR meter b) PMMC meter
c) MI repulsion type d) MI attraction type
Answer- b

13. 67. Which parameter is used in the working of moving coil meter ?
a) Spring coil
b) stray magnetic field
c) Eddy current damping
d) permanent magnetic fields
Answer- d
68. Which meter's movement is not affected by stray magnetic fields?
a) PMMC meter
b) Thermo couple meter
c) MI meter – attraction type
d) MI meter – repulsion type
Answer- a
69. Which band of frequency is used for RADAR in the frequency spectrum allocated by the
International Telecommunication Union ?
a) ITU band- 4
b) ITU band- 6
c) ITU band- 8
d) ITU band- 10
Ans. d
70. Which frame is used for winding the coil of PMMC meter?
a) steel frame
b) Wooden frame
c) Ceramic frame
d) Aluminum frame
Answer- d
71. How is the sensitivity of a voltmeter determined?
a) FSD current
b) meter coil resistance
c) Ohm per volt rating
d) Maximum voltage measurement
Answer- c
72. What is the name of the process undertaken to ensure reliable parameters of a measuring
instrument?
a) Calibration b) Range test c) Re-alignment d) Test standards
Answer- a

14. 73. How is the accuracy of amplitude and frequency measured by CRO checked?
a) by sine wave signal
b) by function generator
c) as a complex wave
d) By built in calibration
Answer- d
74. Which material is used for soldering a joint?
a) Oil
b) Flux
c) Acid
d) Grease
Answer- b
75. Which step is important in soldering a joint?
a) warming the joint
b) cooling the joint
c) Gluing the joints
d) Joint cleaning
Answer- a
76. What is the name of the tool?
a) Chopper tool b) Crimping tool
c) Soldering iron d) Plunger de-soldering tool
Answer- d

15. 77. What is the name of soldering iron tip?
a) Conical
b) Pyramids
c) Chisel taper
d) Round bevel
Answer- a
78. What is the full form of the abbreviation SPDT used in switches?
a) Single Phase Dual Throw
b)Single Pole Single Throw
c) Single Pole Double Throw
d) Shared Pole Double Throw
Ans. c
79. When does rosin flux melt in the soldering process?
a) after soldering is melted
b) when the solder is melting
c) melting during soldering
d) when the solder is heated
Answer- d
80.What is the abbreviation of DPDT used in switches?
a) Dual Phase Dual Throw b) Double Pole Direct Throw
c) Direct Pole Double Throw d) Double Pole Double Throw
Ans.d
81. Which method is used for soldering large metal parts?
a) welding b) brazing c) hot soldering d) soft soldering
Answer- b

16. 82. How much time is required to make a quality solder joint using a soldering iron?
a) 3-7 seconds
b) 7-10 seconds
c) 10-15 seconds
d) 15-20 seconds
Answer- a
83. Which type of soldering is used for electronic circuits?
a) Brazing
b) soft soldering
c) hot soldering
d) hard soldering
Answer- b
84. Which device works on the principle of air suction?
a) soldering iron
b) soldering wick
c) Desoldering braid
d) Desoldering pump
Answer- d
85. Which soldering instrument has the facility of blowing hot air?
a) soldering iron
b) soldering station
c) Wave soldering machine
d) Temperature controlled soldering iron
Answer- b
86. What is produced by the power supply in a soldering iron?
a) Fire
b) heat
c) cold wind
d) water vapour
Answer- b
87. What is the name of the defect if the flux is unable to remove tarnish from a soldering joint?
a) cold joint b) poor wetting
c) Potholes d) Dull Gravity Surface
Answer- a

17. 88. Why is solvent Iso Propyl Alcohol used on solder joints ?
a) To help in corrosive action
b) Cleaning the joint before soldering
c) To break down the acids inside the joint
d) Remove residual flux and prevent corrosion
Answer- d
89. How are the oxide pearl layers removed before soldering activity is carried out?
a) by using flux
b) Clean as normal
c) Use abrasive method
d) Use isopropyl alcohol
Answer- c
90. Why does plunger desoldering tool require periodic cleaning?
a) to melt the soldering quickly
b) To aid in soldering the joints
c) To prevent clogging of the nozzle
d) To remove the effluent collected in the chamber
Answer- c
91. What is the type of transformer?
a) isolation transformer
b) Single phase transformer
c) low frequency transformer
d) High frequency transformer
Answer- d
92. How is power rating specified for a transformer?
a) Wattage b) voltage (V)
c) Volt ampere (VA) d) Horse Power (HP)
Ans. c

18. 93. Which factor determines inductance?
a) material of the coil
b) diameter of the coil
c) Recurrence of current
d) current flow through the coil
Answer- b
94. Which property of a capacitor stores electrical energy in an electrostatic field?
a) Dielectric
b) Capacitor
c) Stray capacitance
d) Capacitive reactance
Ans.d
95. Which unit is used to measure capacitance value?
a) Mho
b) Ohm
c) Farad
d) Henry
Ans. c
96. What is the purpose of the electronic component used in a radio receiver?
a) Demodulator
b) Tuning circuit
c) Audio amplification
d) Automatic gain control
Answer- b
97. Which meter is used to find the accurate resistance value of resistors?
a) ammeter b) volt meter
c) Ohm meter d) Watt meter
Answer- c

19. 98. What is the result of hysteresis loss in magnetic materials?
a) back EMF increases
b) eddy current is reduced
c) magnetic flux increases
d) energy is lost
Answer- d
99. What is the value of Carbon Composition Register?
a) 2200W
b) 3300W
c) 3900W
d) 4700W
Ans.b
100. What is the purpose of trimmer capacitor?
a) Coupling
b) Filtering
c) Decoupling
d) Fine tuning
Answer- d
101. What is the purpose of vacuum contactors in electrical panels?
a) fast switching
b) slow switching
c) Packet switching
d) Medium Switching
Answer- a
102. Why is the transformer core made in the form of thin strips?
a) To reduce eddy current losses
b) to increase the hysteresis loss
c) for maximum current loss
d) to increase core saturation losses
Answer- a

20. 103. Which part of the relay causes most trouble?
a) hinges b) relay coil c) relay contacts d) frame and core
Answer- c
104. Which type of ripple filter circuit is used for large load current requirements?
a) LC Filter b) RC Filter
c) Inductor input filter d) Capacitor input filter
Answer- d
105. Which component filters out ripple in a rectifier circuit?
a) DIAC b) Diode c) TRIAC d) Capacitor
Answer- d
106. Which parameter remains constant in Zener diode?
a) Power
b) Current
c) voltage
d) resistance
Answer- c
107. What is meant by maximum safe reverse voltage in a diode?
a) PIV voltage
b) knee voltage
c) break down voltage
d) reverse break down voltage
Answer- a
108. What is the name of the circuit diagram?
a) bridge rectifier b) amplifier circuit
c) Regulator circuit d) Modulator circuit
Answer- a

21. 109. Which is the first step in troubleshooting an electronic circuit?
a) Thermal testing
b) Chemical tests
c) Mechanical testing
d) Physical and sensory testing
Answer- d
110. Which diode is used in low power communication circuits?
a) Signal diode
b) rectifier diode
c) switching diode
d) high power diode
Answer- a
111. What is the process of adding impurities to a pure semiconductor material?
a) Doping
b) Etching
c) Forming
d) Diffusion
Answer- a
112. What is the regulated output voltage?
a) 6 volts
b) 12 volts
c) 18 volts
d) 22 volts
Answer- b
113. Which impurity is added to make P-type semiconductor material?
a) arsenic b) gallium
c) Antimony d) Phosphorus
Answer- b

22. 114. Which impurity is added to a pure semiconductor to form an N-type material?
a) Boron
b) Indium
c) Arsenic
d) Gallium
Answer- c
115. What is the name of the process of converting AC into DC voltage?
a) Inverting
b) Rectifying
c) Amplifying
d) demodulation
Answer- b
116. What is the minimum current rating of a four diode bridge rectifier to supply a load current of
1.8 Amp?
a) 0.9 Ampere
b) 1.8 Ampere
c) 2.0 Ampere
d) 5.0 Ampere
Ans.b
117. What is the full form of the abbreviation ISA?
a) Industry System Architecture
b) Industry Software Architecture
c) Industry Standard Architecture
d) Institution Standard Architecture
Ans. c
118. Which port is used to connect and power a peripheral device to the CPU plug?
a) USB
b) RJ45
c) COM1
d) COM2
Answer: a
119. What is the advantage of SMPS in computer?
a) Heavy
b) High efficiency
c) Reduce high frequency noise
d) Servicing of SMPS is easy

23. Answer- b
120. What is the full form of MOV in electronic components?
a) Metal Over Varistor
b) Metal Over Varactor
c) Metal Oxide Varistor
d) Metal Oxide Varactor
Ans. c
121. Which port is used to connect HDD on the motherboard?
a) IDE
b) COM-1
c) COM2
d) Floppy drive
Answer: a
122. What is the full form of the abbreviation LBA in computer systems?
a) Low block accessing
b) Large block accessing
c) Large boot addressing
d) Logical block accessing
Ans.b
123. What is the full form of the abbreviation CD-ROM in computers?
a) Classified Device Read Only Memory
b) Computer Disk Read Only Memory
c) Connectivity Disk Read Only Memory
d) Compact Disk Read Only Memory
Ans.d
124. Which component reads and executes commands from memory?
a) Processor
b) Graphics card
c) read only memory
d) Random Access Memory
Answer- d
125. Which code is stored in the computer ROM BIOS chip?
a) Changed codes
b) Temporary code
c) Permanent code
d) Partial change code
Answer- c

24. 126. Which mouse action is used to move an object from one place to another?
a) Left click
b) Right-clicking
c) Drag and Drop
d) Double-clicking
Ans. c
127. Which section is used by the processor to save instructions?
a) Memory
b) System unit
c) Graphics card
d) Microprocessor
Answer- a
128. Which option opens a list of programs currently installed in the computer?
a) Help menu
b) Start menu
c) all programs
d) Recent Documents
Answer- c
129. In computer processing data, which table maintains the size of partitions?
a) Process Table
b) Partition table
c) Program table
d) Procedure table
Answer- b
130. At what speed does the spindle motor rotate inside the hard disk?
a) 4000 to 8000 rpm
b) 2500 to 5000 rpm
c) 3500 to 6000 rpm
d) 3600 to 7200 rpm
Ans. d
131. Which metal coating is used on compact discs?
a) silver b) nickel
c) Chromium d) Aluminium
Answer- d

25. 132. Where are programs and data stored after execution in a computer?
a) Buffer
b) Chip set
c) Memory
d) Processor
Answer- c
133. Which shortcut key function is used to close the working window on a computer?
a) Ctrl + S
b) Ctrl + P
c) Alt + F4
d) Shift + F3
Ans. c
134. Which device converts digital data from a computer into analog data and transmits it through
a telephone line?
a) Modem
b) Chipset
c) Processor
d) Cache memory
Answer- a
135. Which component is used to resist AC supply voltage in SMPS?
a) metal film register
b) Carbon film register
c) Metal Oxide Register
d) Wire wound register
Answer- c
136. Which component is used to remove the heat generated inside SMPS?
a) heat sink
b) cooler fan
c) Silicon grease
d) Mica film spacer
Answer- b
137. How many transistors are made inside a VLSI (Very Large Scale Integration) IC?
a) 1000 and above b) 1 to 10 transistors c) 10 to 100 d) 100 to 1000
Answer- a

26. 138. Which IC package contains 100 to 1000 transistors?
a) LSI
b) SSI
c) MSI
d) VLSI
Answer: a
139. Which is a 3 terminal, negative voltage regulator IC?
a) LM 320
b) LM 340
c) IC 7905
d) IC 7812
Ans. c
140. Which three terminal voltage regulator IC has adjustable output?
a) LM 100
b) LM 105
c) LM-305
d) LM-317
Ans.d

27. ITI Question Bank (2nd Year)
1. What is the full form of the abbreviation DSO?
Dual System Oscillator
b) Dual storage Oscillator
c) Digital system Oscilloscope
d) Digital Storage Oscilloscope
Ans. d
2. What type of wave form is available at pin number 2 of function generator IC 8038 ?
a) sine wave
b) Square wave
c) triangular wave
d) modulated wave
Answer- a
3. Which function produces a stationary wave displayed on the DSO screen?
a) Auto set function
b) triggering function
c) Saving setup function
d) Recalling a setup function
Answer- a
4. What is the purpose of sampling in DSO operation?
a) control time base signal
b) convert analog signal to digital
c) convert digital signal to analog
d) Visualize the signal on the screen
Answer- b
5. How is the overall operation of the DSO controlled?
a) by using a microprocessor
b) By using ICs and transistors
c) By using discrete components
d) By using diode and transistor
Answer- a
6. Which function is performed by the sample/hold circuit with ADC in a digital storage
oscilloscope?
a) Storage b) Data display
c) Data acquisition d) Upload to computer
Answer- c

28. 7. What is the name of the circuit built with IC 8038 ?
a) Pulse generator
b) sine wave generator
c) square wave generator
d) function generator
Answer- d
8. What is the name of the factory setup that is done for a digital storage oscilloscope?
a) General setup b) Factory setup
c) Default setup d) Measurement setup
Answer- c
What type of wave is available at pin number 3 of IC 8038 function generator?
a) sine wave b) square wave c) Triangle wave d) Modulated wave
Answer- c
10. Which part of the DSO stores the processed data of the input signal voltage?
a) memory b) screen display c) analog to digital converter d) digital to analog convert
Answer- a
11. What is the name of the waveform displayed on the DSO screen?
a) DC waveform b) Pulse waveform c) Ringing waveform d) Slight waveform
Answer- c

29. 12. Which circuit is used in a DSO to convert the input sampled voltage into digital information?
a) Rectifier circuit b) Inverter circuit
c) Digital to analog converter circuit d) Analog to digital converter circuit
Answer- d
13. What type of waveform is available at pin number 9 of the function generator IC 8038 ?
a) sine wave
b) Square wave
c) triangular wave
d) modulated wave
Answer- b
14.What is the type of SMD IC package?
a) PGA pack b) TSOP pack c) Flat pack d) Quad flat pack
Answer- a
15.What is the acceptable resistance value range for ESD wrist strap?
A : 1Ω
B : 1 kΩ
C : 1MΩ
D : 10MΩ
Ans. c
16. What are the types of SMD IC packages?
a) LCC b) PLCC c) MLCC d) TSOP
Answer: a

30. 17. What is the power rating of soldering irons used in electrical and electronics work?
a) 15 to 35 watts b) 40 to 65 watts
c) 75 to 100 watts d) 85 to 135 watts
Answer: a
18. What is the full form of PGA used in SMD IC package?
a) Package Grid Array b) Pin Grid Array
c) Perfect Grid Array d) Popular Grid Array
Ans.b
19. Which type of hot air pencil tip is used in SMD soldering?
a) Oval type b) Round type
c) Angle type d) Fine/Jet type
Answer- c
20. What is the range of temperature settings on soldering work station for soldering SMD ICs?
a) 100 0
C to 200 0
C
b) 2000
C to 250 0
C
c) 2500
C to 280 0
C
d) 280 0C
to 400 0C
Ans. c
21. Which method is effective for controlling ESD during manufacturing of devices?
a) use helmet b) use metal chain
c) Use ESD wrist strap d) Use tables
Answer- c
22. Which technique is used to place components directly on printed circuit boards?
a) Solder mount technology b) Surface mount technology
c) Safety Metaphor Technology d) Silicon Multiplier Technology
Answer- b

31. 23. What is the name of the device?
a) Micro controller
b) Signal generator
c) SMD workstation
d) Insulation tester
Answer- c
24. What is the name of SMD device?
a) 90 degree turning tool
b) Monocular magnifier
c) Heated Tweezers
d) soldering pump
Answer- c
25. What is the alternative to ceramic SMD IC package?
a) Glass packages
b) Plastic packages
c) Metal packages
d) Fibre packages
Answer- b
26. What is the purpose of the bumper corners of a bumper quad flat pack?
a) Stop the vibration b) to dissipate heat
c) Protecting the IC leads d) provides mechanical strength
Answer- c

32. 27. What is the full form of the abbreviation SOIC?
a) Surface Optimized internal circuits
b) Small outline integrated circuits
c) Service outline internal circuits
d) Solder oriented integrated circuits
Ans.b
28. What is the full form of the abbreviation SMT?
a) Specific Multiple Technology
b) Small metallized technology
c) Surface mount technology
d) Solder mount technology
Ans. c
29. What is the use of bench top loners?
a) To control the humidity in the atmosphere
b) To control ESD in the working environment
c) To control the voltage
d) to reduce molecules
Answer- b
30. What is tinning in soldering?
a) Clean the tip of the iron
b) replace the iron tip
c) Melt some flux on the tip of the iron
d) Remove the iron tip
Answer- c
31. What is the name of the fault caused by an ESD event?
a) mechanical fault
b) shedding fault
c) Latent defect
d) Tombstone defect
Answer- c
32. How to reduce the cause of ESD during manufacturing of devices?
a) Used for AD ground
b) By using ESD controlled footwear
c) By using normal footmats
d) wearing plastic nutrient material
Answer – b

33. 33. What is the cause of voiding in SMT?
a) Damaged wiring
b) Damaged components
c) Impaired joint strength
d) Restricted voltage level
Answer- c
34. What is the composition of solder paste for reflow soldering process?
a) Tin and Lead
b) Tin, Lead and Flux
c) Powdered solder and flux
d) Resin cored solder and flux
Answer- c
35. Which conformal coating material is used as a two part thermosetting mixture?
a) Epoxy resin
b) Acrylic resin
c) silicone resin
d) Polyurethane resin
Answer- a
36. Which material is used to make drill bits for drilling PCB holes?
a) stainless steel
b) High speed steel
c) high carbon steel
d) Solid coated tungsten carbide
Answer- d
37. What is the pad width size for soldering resistors, capacitors and diodes on a PCB?
a) 50 Thou b) 60 Thou
c) 70 Thou d) 80 Thou
Ans. c
38. Which color of solder mask is used on PCB ,
a) Brown
b) Orange
c) Green
d) Violet
Answer- c

34. 39. What is the size of the pads for soldering Dual In Line (DIL) components on a PCB?
a) oval
b) Goal
c) Square
d) Rectangle
Answer- a
40. Which method of conformal coating is used to coat epoxy on PCB?
a) Solvent
b) Peeling
c) Micro blasting
d) Mechanical removal
Answer- c
41. Which conformal coating is easy to apply and remove with low moisture absorption?
a) Epoxy resin
b) Acrylic resin
c) Silicon resin
d) Polyparabolic
Answer- b
42. Which protective chemical coating is applied on PCB?
a) Shelak
PVC coating
c) Enamel Varnish
d) Polymer film coating
Answer- d
43.What is the last zone on reflow soldering?
a) preheated zone b) relofo zone
c) Cooling zone d) Thermal soak zone
Answer- c
44. What is the second step in the reflow soldering process?
a) Reflow zone
b) Cooling zone
c) preheated zone
d) thermal soak zone
Answer- d

35. 45. Which zone is the longest in reflow soldering process?
a) Reflow zone
b) Cooling zone
c) preheat zone
d) thermal soak zone
Answer- c
46. What is the ramp up rate of temperature in the preheat zone in reflow soldering process?
a) 1 0
C to 3 0
C / sec
b) 4 0
C to 5 0
C / sec
c) 6 0
C to 10 0
C / sec
d) 11 0
C to 20 0
C / sec
Answer: a
47. What is the common method for attaching surface mount components to a printed circuit
board?
a) wave soldering
b) manual soldering
c) soldering station
d) Reflow soldering
Answer- d
48. What is the purpose of providing solder mask on PCB?
a) easy soldering
b) To remove conformal coating
c) To provide conformal coating
d) To prevent solder bridges
Answer- d
49. How is the solder mask on a PCB removed for replacement of components?
a) Micro blasting b) Grinding and scraping
c) Peeling off conformal coating d) Photolithography
Answer- d
50. What is the range of peak temperatures reached in the reflow zone of the reflow soldering
process?
a) 10 0
C to 15 0
C
b) 20 0
C to 40 0
C
c) 410C
to 60 0
C
d) 61 0C
to 80 0C
Ans.b

36. 51. How is the fine grain structure of soldered joint achieved using soldering process?
a) faster cooling rate
b) slow cooling rate
c) the oven temperature changes
d) high temperature soak time
Answer- a
52. What is the typical temperature range of the cooling zone in the process of applying flow
soldering?
a) 10 0
C to 15 0
C
b) 30 0
C to 100 0
C
c) 410C
to 60 0C
d) 61 0C
to 80 0C
Ans.b
53. Which manufacturing technique is used for the assembly of circuit boards?
a) Microchip fabrication
b) Single layer fabrication
c) Double sided fabrication
d) Plated throw hole fabrication
Answer- a
54. What is the name of the technique used to mount components on multilayer PCBs ?
a) Microchip fabrication
b) Peeling technique
c) Joining technique
d) Plated through holes
Answer- d
55. Which type of coating process is used to apply per-xylene as conformal coating on PCB?
a) Dipping b) Brushing
c) Spraying d) Chemical vapour deposition
Answer- d
56. What is the effect on solder paste when the ramp-up rate exceeds the maximum slope in the
reflow soldering process?
a) poor wetting
b) fire and gases
c) Balon hole effect
d) spattering effect
Answer- d

37. 57. The maximum allowable temperature of the reflow soldering process is reached in which
region?
a) Reflow
b) Cooling
c) preheat
d) Thermal soak
Answer- a
58. What is the cooling rate for the reflow soldering process?
a) 3 0
C/second
b) 4 0
C/second
c) 5 0
C/second
d) 10 0
C/second
Ans.b
59. What is the reason, lack of flux cleaning action leads to poor wetting and defective solder joint
in reflow soldering process?
a) Higher ramp-up rate
b) Longer zone preheat zone time
c) Higher thermal soak exposure
d) Insufficient time/temperature
Answer- d
60. What is the fusing factor of reusable HRC fuse?
a) 1
b) 1.1
c) 1.2
d) 1.5
Ans.b
61. What is the current rating of cartridge fuse used for domestic wiring?
a) 1250 Ampere b) 1350 Ampere
c) 1450 Ampere d) 1550 Ampere
Answer: a
62. What is the current rating of reusable fuses used for domestic wiring?
A) 200A
b) 300A
c) 400A
d) 500A
Answer: a

38. 63. What is the name of the part marked as x in MCB ?
a) Latch
b) Plunger
c) solenoid
d) Contact
Answer- c
64. What is the name of the relay used in electrical circuit?
a) latching relay
b) ferried relay
c) dry reed relay
d) voltage sensing relay
Answer- c
65. What is the current rating of tinned copper wire 40 SWG used for reusable fuse ?
a) 1.0A
b) 1.5A
c) 2.5A
d) 4.0A
Ans.b

39. 66. What is the name of the cartridge fuse part marked x?
a) Hit Contact
b) Fuse wire
c) Sand filling
d) Brake indicator
Answer- d
67. What is the full form of the abbreviation ELCB used in electrical circuits?
a) Earth lead circuit breakers
b) Electrical Live contact breakers
c) Equipment load circuit breakers
d) Earth leakage circuit breakers
Ans.d
68. What is the type of relay?
a) thermal relay
b) dry reed relay
c) impulse relay
d) latch relay
Answer- c
69. Which series MCB is used for motor protection?
a) 'L' series MCBs b) 'F' series MCBs
c) 'G' series MCBs d) 'DC' series MCBs
Ans. c

40. 70. What is the breaking capacitor of a DC series MCB?
a) 6kA
b) 8kA
c) 10kA
d) 12kA
Answer: a
71. What is the maximum voltage rating for DC series MCB?
a) 110VDC
b) 220VDC
c) 415VDC
d) 440VDC
Ans.b
72. What is the maximum current rating for a 4 pole MCB ,
a) 50A
b) 60A
c) 70A
d) 80A
Ans.b
73. What is the fusing factor of a reusable fuse selected for overcurrent protection in a circuit?
a) 1.1
b) 1.2
c) 1.3
d) 1.4
Ans.d
74. What is the name of the current interrupted by a circuit breaker?
a) Rated current
b) residual current
c) Earth leakage current
d) Prospective fault current
Answer- d
75. Which relay has contact arrangement to break, make or shift the contact connection?
a) dry reed relay
b) latching relay
c) Mercury weighted contact relay
d) clamper type armature relay
Answer- d

41. 76. Which relay works when the current in the coil reaches the upper limit?
a) latching relay
b) under current relay
c) current sensing relay
d) voltage sensing relay
Answer- c
77. Which device is used in electrical installations to avoid electric shock?
a) MCB
b) MCCCB
c) ELCB
d) insulators
Ans. c
78. Which type of relay is used in voltage stabilizer?
a) latching relay
b) under current relay
c) current sensing relay
d) voltage sensing relay
Answer- d
79. What is the name of the device?
a) Starter
b) Relay
c) Contactor
Switch
Answer- c
80. If an ELCB has a rated tripping current of 10 mA, what will be the maximum earth fault loop
impedance?
A : 900 Ω B : 1200 Ω C : 1666 Ω D : 2666 Ω
Ans. c

42. 81. What is the fusing current for a rewireable fuse?
a) 1.2
b) 1.5
c) 2.2
d) 1.4 to 1.7
Ans.d
82. Which parameter opens the fuse element under fault without damaging the load?
a) current rating
b) voltage rating
c) Power rating
d) Rupture capacity
Answer- d
83. Which relay is used for time delay purpose?
a) reed relay
b) impulse relay
c) thermal relay
d) electromagnetic relay
Answer- c
84. Which relay is operating with very low power?
a) reed relay
b) impulse relay
c) thermal relay
d) electromagnetic relay
Answer- a
85. What is the current rating of cartridge fuse with brown colour code?
a) 1A
b) 2A
c) 4A
d) 5A
Ans. c
86. What is the time taken by overload relay to open the motor contacts at 500 percent of full load
current?
a) 5 seconds
b) 10 seconds
c) 15 seconds
d) 20 seconds
Ans.b

43. 87. Which device opens and closes the auxiliary circuit?
a) Fuse
b) Relay
c) Starter
d) Circuit breaker
Answer- b
88. What is the current rating of copper colour fuse cartridge?
a) 25 amperes
b) 35 amperes
c) 50 amperes
d) 63 amperes
Ans.d
89. Which function is performed by an isolator in an electrical circuit?
a) as a fuse
b) as a switch
c) Over loaded cut off
d) Earth leakage cut off
Answer- b
90. In which situation the MCB is opening the electric circuit?
a) low flow
b) high voltage
c) short circuit
d) Earth leakage
Answer- c
91. What is the trip to remove short circuit in MCB combination circuit breaker?
a) 1 millisecond
b) 3 milliseconds
c) 4 milliseconds
d) 5 milliseconds
Ans.b
92. What is the reason for starting the motor with chattering noise?
a) high voltage b) no volt coil burnt
c) Control circuit of relay is open d) Dust between contacts in electromagnet
Answer- d

44. 93. Which formula is used to find the fusing factor?
a) Minimum fusing current/Rated current
b) Rated current/Minimum fusing current
c) Minimum fusing current – Rated current
d) Minimum fusing current + Rated current
Answer: a
94. What is the reason for humming noise coming from the starter?
a) low voltage
b) open no volt coil
c) Auxiliary contact not closing
d) Meeting on the no volt coil
Answer- a
95. Which factor is considered for the time taken by a fuse to interrupt the circuit in case of a fault?
a) power factor b) fusing factor c) cut off factor d) paralleling factor
Answer- c
96. What is the reason for failure of the contactor due to overheating of the no-volt coil?
a) low voltage b) high incoming supply
c) Control relay off circuit relay open d) Open in no volt coil circuit
Answer- b
97. Which single phase induction motor is rated for 1HP or more?
a) commutator motor b) permanent capacitor motor
c) split phase induction motor d) fractional horse power motor
Answer- d
98. What is the name of the centrifugal switch part marked x?
a) Contacts b) Governor
c) Insulator ring d) Governor weight
Answer- b

45. 99. What is the name of the curve of torque speed characteristics of the motor?
a) split phase motor
b) permanent capacitor motor
c) Capacitor start capacitor motor
d) Capacitor start induction run motor
Answer- a
100. Which motor is described by low rotor circuit resistance and reactance?
a) Class-A
b) Class-B
c) Class-C
d) Class-D
Answer: a
101. What is the class of squirrel cage induction motor according to starting characteristics?
a) Class-A
b) Class-B
c) Class-C
d) Class-D
Ans.b
102. What is the starting torque obtained by a class-D type squirrel cage motor?
a) 2 b) 3 c) 5 d) 6
Ans.b
103. How is the centrifugal switch connected in capacitor start induction run motor?
a) across the starting winding b) across the running winding
c) in series with the starting winding d) in series with the running winding
Answer- c

46. 104. What is the starting torque of class-C type squirrel cage motor at rated speed?
a) 2 b) 3 c) 5 d) 6
Answer: a
105. What is the purpose of capacitor used in single phase motor?
a) to divide the current
b) to divide the voltage
c) to split the phase
d) to divide the resistance
Answer- c
106. Which induction motor is preferred for constant speed with high efficiency performance?
a) slip ring b) split phase c) shaded pole d) squirrel cage
Answer- d
107. What is the name of the permanent capacitor motor part marked x?
a) main winding b) series winding c) shunt winding d) auxiliary winding
Answer- d
108. Which test is conducted through the circuit?
a) Capacity test on capacitor b) Charge test on capacitor
c) Discharge test on capacitor d) Insulation test on capacitor
Answer- b

47. 109. What is determined by the way the main winding and auxiliary winding are connected in a
split-phase motor?
a) torque created
b) coil resistance
c) direction of rotation
d) maximum flow generation
Answer- c
110. Why are the main and starting windings of a split-phase motor connected to the supply at the
time of starting?
a) reducing the current flow
b) reducing the magnetic flux
c) combining magnetic fluxes
d) produce rotating magnetic field
Answer- d
ITI Electronics Mechanic MCQ Book in Just Rs.19/- [850 Important Question]
ITI Engineering Drawing Best MCQ Book in Just Rs.12/- [500 Question]
ITI Employability Skills MCQ Book in Just Rs.15/- [500 Questions in Hindi/English]
HEETSON
Telegram https://t.me/Heetson_Official
WhatsApp Channel
@heetsoniti