7th Semester Electronic and Communication Engineering (2013-June) Question Papers
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7th Semester Electronic and Communication Engineering (2013-June) Question Papers Document Transcript

  • 1. 'l USN Time: 3 hrs. Notet Answer FIVE full questions, selecting at least TWO questions from each part. 06EC7t Max. Marks:100 of addresses that are used in an (t0 Marks) (06 Marks) (10 Marks) (06 Marks) (04 Marks) Seventh Semester B.E. Degree Examination, June/July 2013 Gomputer Gommunication Networks s .b 3c 6q) .=.l .=.9 e.. d= .> -i .i o z E PART - A I a. Explain briefly with relevant examples, the four levels 2a. b. c. 3a. 4 a. List the goals offast Ethernet. internet employing the TCP/IP protocols. (10 Marks) b. Briefly describe the functions ofphysical layer and data link layer. (06 Marks) c. Explain the operation of ADSL using 'Discrete Multitone Technique' indicating the different chaanels, with a diagram. (04 Marks) Explain the mechanism of selective repeat ARQ with diagram showing send window and receive window (10 Marks) With suitable block diagram, explain the stop and wait protocol, for noise less channels. Also write the sender site algorithm. (06 Marks) Perform bit stufling and unstuffing on the given bit stream: 0001111111001111101000. Assume 11ag as 01 1 1 1 I 10. (04 Marks) Explain how collisions are avoided through use of 'lFS, contention window and acknowledgments' in CSMA,/CA. With the help of the flow chart show the procedure for CSMA/CA. b. Explain'Token Passing' method ofcontrolled access ofthe channel. c. A slotted ALOHA network transmit 200 bit frames using a shared channel with a 200 kbps bandu,idth. Find the throughput if the system produces i) 1000 frames per second ii) 500 frames per second iii) 250 frames per second. (04 Marks) 5a. Explain the features ofphysical layer in fast Ethernet. b. Explain two different kinds of serr,,ices as defined in IEEE 802. I 1. c. Write a note on Piconet and Scatternet in Bluetooth. PART - B A sysiem with four LANs and frv"-G@ rhown in Fig.Qs(a). Choose Bl as the root bridge. Show the fbrwarding and blocking ports, after applying the spanning tree procedure. LeF,+ Fig.Qs(a) 1of2 LhNI (10 Marks)
  • 2. t , l 06EC71 b. Define repeater, bridge and router with necessary diagrams' (06 Marks) c. Differentiate between a bus backbone network and star backbone network. (04 Marks) . 6 a. An ISP is granted a block of addresses starting with 150.80.0.0/16. The ISP wants to -' distribute these blocks of2600 customers as follows: D The first group has 200 medium size business; each needs 16 addresses' ii) The second group has 400 small business; each needs 8 addresses' iii) The third grJup has 2000 households; each needs 4 addresses' ,' Design the subblocks and give the slash notation for each subblock. Find out how many adtltesses ate still available after these allocations. (10 Marks) b. eiplain briefly strategies used to handle the transition from IPv4 to IPv6. (06 Marks) c. A 'blbii;.of addressis is granted to a small organization. One of the addresses is 205.16.37.39128. What is the first address, last address and number of address in the block. 7a. Explain the 'Distarfe Vector Routing' 'for the following e1mple shown in Fig.Q7(a)' (10 Marks) (04 Marks) Briefly discuss the foltowing forwarding techniques: i) Next-Hop method versus Route method ii) Network-specific method versus Host specific method. Distinguish between diulticasting and multiple unicasting. Explain connection establishment and connection termination,in TCP. (10 Marks) write a note on DNS. (06 Marks) Write a shorri irote on source port number and destination port nurnber.in user datagram. ' (04 Marks) (06 Marks) (04 Marks) 8a. b. c. Fig.Q7(a) 2 of2
  • 3. r USN Time: 3 hrs. 068C72 Max. Marks:100 (06 Marks) (06 Marks) of glass fiber, how RI can be (04 Marks) approximately 1000 modes at an 850nm Seventh Semester B.E. Degree Examination, June/July 2013 Optical Fiber Gommunication Note: Answer FIVEfull questions, selecting at leost TWO questions from each part. o E I ai! '=^ a-a o." ,i .9 6, at= o :: 6.S o< .i ..i o z E la. b. c. PART-A Discuss the advantages and disadvantages ofOFC. Explain Mode Field Diameter (MFD) of a single mode fiber. Differentiate between glass fiber and plastic fibers. In case varied? d. A SI multimode fiber with a NA of 0.20 supports wavelength. i) What is the diameter of its core? iD How many modes does the fiber support at iii) How many modes does the fiber support at 2 a. Explain the "pulse dispersion" with suitable diagram and ditferentiate MMSIF, MMGIF and SMF by their information carrying capacity with reason. (06 Marks) b. Discuss the following for optical fibers: i) Extrinsicabsorprion. ii) Materialdispersion. c. Optical power launched into fiber at transmitter end is 150pw. The power at the end of 10km length of the link working in first window is -38.2 dBm. Another s/m of same length working in second window is 47.5 pw. Same length sim working in third window has 50% of launched power. Calculate ltber attenuation for each case and mention wavelength of operation. (06 Marks) 3 a. A double-hetero junction "lnGaAsP" LED emitting at a peak,wavelength of 1310 nm has radiative and non radiative recombination times of 25 ns and 90 ns respectively. The drive current is 35 mA. i) Find the internal quantum efficiency and the internal power. ii) If the RI of the light source material is n : J.5. Find the power emitted iiom the device. (06 Marks) b. Describe the following terms relating to LASER: i) External quantum efficiency. ii) Wavelengthspacing. c. Explain the tlree lactors which affects the response time ofa photodiode. 4 a- Discuss the different lensing scheme used to improve the source-to-fiber coupling efficiency, with the necessary sketches. (06 Marks) b. For a surface emitting LED has radiance of l50W(cm2.sr) and radius of emitting area is 35pm. Calculate the optical power coupled to the fibers with 1320 nm? 1550 nm? (04 Marks) (08 Marks) (06 Marks) (08 Marks) (06 Marks) (08 Marks) a1 = 25prm and NA : 0.20, step index a2 : 50pm and N A:0.20, step index. c. Define fiber splicing. Explain different types of splicing with neat sketches. 1 of2
  • 4. t-I 06F,C72 PART-B 5 a. Explain the different tlpes of front-end amplifiers in optical receiver. (06 Marks) b. With a neat sketch, explain how system performance information can be obtained from the eye diagram. c. Write a short note on burst-mode receivers. (08 Marks) (06 Marks) -.':g a. Following are the parameters of a point-to-point optical link: :- - i) Optical power launched : +3dBm ,. il) Sensitivity ofdetector : -32dBm r'- iii) Source/detector connector loss : 1dB 'iv), Length ofoptical cable : 60 km v1'... t'Cable attenuation : 0.3dB/kmv1'...t'Cable attenuation : 0.3dB/km vi) ' Jqrnper cable loss : 3dB vii) Co'nnector loss at each fiber :1dBLbnnector loss at eacn rlDer : lol]' r-' joint (two at each transmitter and receiver end be&trse of the jumper cables) Compute the powel margin of the link using spread sheet'mbthod' (06 Marks) b. Explain the basic eleruents of analog link with differenl nrii3e contribution. (09 Marks) c. What is sub carrier multiplexing? Explain. (05 Marks) 7 a. Explain the need of isolator iiidptical network.'Give its principle of operation also. (06 Marks) f. Explain the operational principle an! iilplementation of WDM. (08 Marks) s. Briefly discuss dielectric thin-film ftltg1C;. (06 Marks) ,'-- I '., 8 a. Explain the three main optical amplifier types. (06 Marks) b. Describe: i) SONET/SDH rings..,. ii) SONET/SDHnetworks. iii) Frame format pf STS-1 SONET. (t0 Marks) c. An EDFA amplifier'produces P..out : 27dBm for an input Pqio = 2dBm at 1542 nm. i) Find the aipplifier gai4 G. ii) Y,i: *" minimum pump power required. (04 Marks) .-. ,;..i * * * :t * 2 of2
  • 5. I USN 06EC73 (12 Marks) (02 Marks) (10 Marks) (06 Marks) E 89 te bE -a'CA tq ,i .? a,i 6.Y a3 9< - ..i o z o F Seventh Semester B.E. Degree Examination, June / July 2013 Power Electronics Time: 3 hrs. Max. Marks:100 Note: l. Answer any FIVE full questions, selecting utleost TWO question from each part. 2. Draw neat diagram and Waveforms, wherever possible. P.{RT - A I a. What is Power Electronics? Draw a neat block diagram of generalized power converter system. State the applications ofpower dlectronics. (06 Marks) b. With neat circuit diagram and waveforms. explain the rypes of power electronjc circuils. 2 a. The maximum junction temperature of a transistor is Tt : 1500C and the ambient temperature is To:250a, If the thermal impedances are &c:0.40ClW, R.,:0.1oC/W, and Rse : 0.50C/W. Calculate i) the maximum power dissipation and ii) the case c. Compare General purpose, Fast recovery and Schokky diodes. n - tlpe (enhancement) MOSFET. c. Write a note on isolation ofgate and base drives. temperature. (0,1 Marks) b. With the help of parasitic model and switching model, explain the switching waveforms of 3 a. Using a two transistor model of thyistor, show that Ie = olq + ]tuu' * Iquo' . (06 Marks) 1 - (cr, +crr) b. With neat sketch, explain turn on characteristics of SCR. (06 Marks) c. The input voltage Fig. Q3(c) is V, = 200V with load resistance of R - 5O. The load and stray inductances are negligible and the thy,ristor is operated at a frequency of f. : 2KHz. If the required dv/dt is 100 V/pS and the discharge current is limited to 100,4.. Determine i) the values ofR. and C. ii) the snubber loss, and iii) the power rating of the snubber resistor. (08 Marks) Pi3 . q3 c.d"/dv Y*u.-..t.,,,., C.,r.cliL 4a. b. c. Discuss the effect of inductance using the 1 - O full converter. (08 Marks) What is phase control? Explain the principal of phase control using 1 - $ half wave controlled rectifier. (08 Marks) Compare circulating and non - circulating mode ofoperation ofdual converter. (04 Marks) 1 of 2
  • 6. I b. 06EC73 PART-B A thyistor circuit is shown in fig. Q5(a), if thyristor Tr is switched on at t: 0, determine the conduction time of thyristor Tr and the capacitor voltage after Tr is tumed off. The circuit parameters are L : l0pH, C - 50pF and V' - 200V. The inductor carries an iniiial current oflm = 250A. (10 Marks) e Pl5 , 4.5a : o"t5 c..,r-*t^ u.J a.r. c- i t_ is ihe principle of complementary commutation? Explain the same with the help of suitable circuit and waveforms. (10 Marks) What is the principle of on off control? Explain the sanie r,nith a single phase full - wave controller. (06 Marks) Draw a neat sketch of 1 - $ AC voltage controller with RL load and explain its working. (06 Marks) c. A single - phase full wave AC voltage controller has a resistive load of R: l0 O and the input voltage is V.: 120V (rms), 60H2. The delay angles of thyristors Tr and T2 ilre eQual ol : 02: r/2. Determine i) the rms output voltage V" ii) the input power factor PF iii) the average current ofth},ristor Inand iv) the rms current ofthlaistor IR. (08 Marks) With a neat circuit diagram, explain the operation of a step down chopper and also explain constant frequency and variable frequency operation. Derive an expression for output voltage incase ofstep down chopper. (10 Marks) b. A step - up chopper with a pulse width of200ps operating on 200V, dc supply. Calcualte the output voltage, ifthe blocking period ofthe device is 50ps. (02 Marks) c- With a neat and quadrant operation, explain class E chopper. (08 Marks) a. With a neat circuit diagram, of 1 - { half bridge inverter, explain the principle of operation ofan inverter. (08 Marks) b. write briefnote on current source inverter. , (06 Marks) c. With the help of circuit diagram and waveforms, explain a variable DC -,trO t"u.[?.nnurur, 2 of2
  • 7. USN 068C74 TMS320C54XX (10 Marks) either on-chip or (06 Marks) located in (04 Marks) Seventh Semester B.E. Degree Examination, June/Juty 2013 c. d. g I te :q 56 9JE G- tq r--) < -i ..i a z A E DSP Algorithms and Architecture Time: 3 hrs. Max. Marks:100 Note: Answer FIVE fult questions, selecting at least TWO questions from each part. PART_A I a' List and explain the issues that have to considered in designing and implementing a DSp system. (04 Marks) [. lmplement an FIR firter ror y(n)- (xtn)+x(n -l)+xtn-2)). Determine the (i) sysrem function (ii) magnitude response function (iii) phase response function. Plot its magnitude and phase response. (06 Marks) c. Explain the process of decimation. (04 Marks) d The signal sequence x(n) : [0 2 4 6 Sl is interpolated using the interpolation filter sequence h : [0.5 1 0.5] and the interpolation factor is 2. Deiermine thi interpolated sequence y(m). (06 Marks) b. Explain the different frequently used teohniqries to prevent overflow and underflow conditions occuning in MAC unit. (04 Marks) Explain the diftbrent ways in which the on-chip memory can be organized efficiently and cost-effective manner. (04 Marks) Explain the register pointer updating algorithm for circular buffer addressing mode. (04 Marks) I-.ist the techniques used in DSP architecture to increase speed of operation and operations that should be accomplished in single clock to achieve purull.li.- in DSp iomplementation. (08 Marks) Explain with a neat clock diagram the indirect addressing mode of processor. Give the operand syntax and operation for the followins: i) Circular addressing mode ii) Bit reverse addressing mode. Ex-plain the different ways in which PC addresses the program memory off-chip and gets loaded for execution ofinstructions. Specifl the on-chip memory configurarion lor Mpl MC, OVLy and DROM processor mode status register of 5416 processor. Describe the operation and application of the following instructions of rMS320c54XX processor with example: i,) MAC i, MAS iii) LD *AR4,4, A Given contents ofAR4 is 8boeh& SxM: l. Determine the contents ofaccumulator. (06 ,larks) Write an ALP of TMS320C54XX processor to compute {n) = h cos x(n) + h(1) x(n - l) + h(2) x(n - 2), using MAC instruction, where h(0) : 5, h(l) : 31, h(2) : 13 are in program memory loiations starting at tr. 4n) '= t, x(n- 1):5 x(n - 2)= -3 are in data memory locations starting at iy(n) is to be saved (lo.wer 16 bits) in location y and y +l (higher 16 bits). (0s Marks) With a neat sketch, describe the Host port interface signals. 1Or tr.lart<g Explain the six-stage pipelined execution of TMS320C54XX. .i , , ios tuartg I of 2 3a. b. c. 4a. b. c. d.
  • 8. a program for a second order IIR filter on TMS320C54XX processor defined by the transfer function H(z) - 0.104 - 0.1022-1 + 0.1042-2 Assume that the filter 1+ z-t - 0.6122-2 poefficients are qls numbers x(n) is the input sample (integer), input samples. are placed in i tnrffer, insamples, fiom a data file, data-in.dat. y(n) is computed output. The output samples ard placed in a buffer outsamples. (10 Marks) c. Explain-with necessary block diagram, memory organization for implementing FIR filter of orderN.-'.. (05 Marks) 6 a. Determine the following for a 512 point FFT computation : i) Number of stages ii) Number of butterflies in each stage iii) Number of butterflies needed [or the entire computation. iv) Number ol butterllies that need no twiddle lactors. v) Number of butterflies ttial require real twiddle factors vi) Number of butterflies that require complex twiddle factors. (06 Marks) b. Explain how scaling prevents overflow conditions in the butterfly computation. (06 Marks) c. Write a TMS320C54XX program'segment that implements 8 point DIT FFT bit reversed PART _ B Explain Q7 and Qrs Notations with example. 068C74 (05 Marks) (08 Marks) DSP in the address range (06 Marks) IIO ND (06 Marks) (08 Marks) (06 Marks) (O8 Marks) 5 a. Define Q Notation. b. Realize and write index generation and to clear FFT dlrta memory. '...'' 7 a. Interface an 8kx 16 prqsaril ROM to the C5416 TFEOOOh _ TFFFFFh. b. Explain with a flow''chdrt diagram for software polling for the programmed converter interface. c. Define intemrpt. Write a flow chart of interrupt handling by C54XX processor. 8 a. Explafuriith neat block diagram the PCM 3002 interfaced to TMS320VC5416 in the DSK. (06 Marks) b. .Explain with block diagram the biotelemetry receiver implementation. i.. 'With a neat sketch, explain the JPEG encoder and decoder. ***** 2 of2
  • 9. / USN PART - B WIy smoothing is needed in image processing? What is ideal LPF and Butterworlh LPF in the above context. accomplish this. 06EC756 its effect on the image? ExPlain an (10 Marks) to transform the in Fig.Qs(b)(ii). and z that will (10 Marks) I o o g@ ;g o'o i: _: -9= 9< Z o E Seventh Semester B.E. Degree Examination, June/July 2013 lmage Processing Time: 3 hrs. Max. Marks:100 Note': Answer FIVEfull questions, selecting at least TWO questions from each parl PART - A I a. with a neat block diagram explain the fundamental steps in digital processing. (10 Marks) b. Consider the two image subsiates Sr and Sz shown in Fig.Ql(b). For V: < 1 >, determine whether these two subsets are: i) 4-adiacent, ii) S-adjacent or (iii) M-adjacent. (10 Marks) S1 S2 D I I o O l ll Ao ll l Fig.Ql(b) 2 a. Explain the role of sampling and Quantization in image processing system' (10 Marks) b. what are the basic relationships between pixels? with neat diagrams and appropriate mathematical expressions, explain (i) neighbours, ii) adjacency, iii) connectivity. (t0 Marks) 3 a. With respect to 2D discrete Fourier transform of an image, explain the following, derive suitable equations: i) Separability ii) Transition iii) Rotalion iv) Periodicity (10 Marks) b. Explain the homomorphic filtering approach fbr image enhancement (10 Marks) 4 a. Give the expression for Hadamord transform and generate the corresponding 1-D Kernal for N :4. Explain any two ofits properties. (12 Marks) b. Write an explanatory note on Histogram equalization. (08 Marks) 5a. b. An image has the gray level pdf p(r) shown in Fig.Q5(b)(i). It is desired gray levels of this images so that they will have the specified p(z) shown Assume continuous quantities and find the transformation in terms of r ? Lz) ootl oloo rtDo o ao o o o oo oo oolo otll Pie.Qs(b)(i) 1of2
  • 10. 6 a. With the help of a neat graphical illustration, explain the powerJaw piecewise linear contrast stretch. b. Explain how image degradation is carried out using: 06EC7s6 transformation and (10 Marks) (10 Marks) (10 Marks) (10 Marks) , r'.' .'.':.] -. r 1"..1i_ .-..i. t 2 of2
  • 11. T]SN Seventh Semester B.E. Degree Examination, June/July 2013 -s --t dql] 0r i; i. (E do 6'= o- ;i ca -i c.i o z E 1a. b. 4 a. Explain scope and visibility of a variable. b. What are the basic language requirements for RT language? Explain. c. What is CUTLASS? What are the requfuements of CUTLASS? PART - B 5 a. Explain dilTerent scheduling strategies. b. Three cyclic tasks A, B, C are required to run at 1 tick, 2 ticks and (1 tick : 20 ms). Assuming tasks A, B, C consumes 5 ms, 8 ms and Write task activation diagram lor priority order. (Context switching time i) A (highest), B, C ii) B (highest), A, C c. What is code sharing? Explain serially reusable and re-entrant code. Real Time Systems Time: 3 hrs. Notez Answer FIVE full questions, selecting dt least TWO questions from each part' PART-A Give two definitions for real time system. Explain dilferent classifications ol RTS based on synclronization 6 a. With a neat diagram, explain the general structure of IOSS. b. Explain the problem of shared memory. How semaphores are problem? c. Explain Liveness. a. Explain foreground and background system with a flowchart. b. Differentiate pool and channel. c. Explain software design for RTS using software module. a. Explain lunctional specifications with respect to a drying oven. b. Explain Yourdon methodologY. c. With a relevant diagram, explain Ward and Mellor's method' and intemal tasks ofthe comPuter. c. Explain hard and soft RTS with relevant equations. 2 a. Compare batch processing and continuous processing b. With a neat diagram, explain distributed systems with its advantages. c. Write a note on supervisory control systems. 3 a. The clock on computer generates an interrupt for every 20 ms' Draw a flow chart for interrupt service routine, *hi.h hu, to keep a 24 hour clock in terms of hours, minutes and seconds' (08 Marks) b. Explain a simple digital input and output interiaces. (10 Marks) c. Write a note on different LAN topologies. (02 Marks) o6EC762 Max. Marks:100 (04 Marks) between external process (08 Marks) (08 Marks) (05 Marks) (10 Marks) (05 Marks) (04 Marks) (10 Marks) (06 Marks) (06 Marks) 3 ticks respectively 10 ms respectively. : 0). (06 Marks) (08 Marks) (07 Marks) used to overcome this (09 Marks) (04 Marks) (10 Marks) (04 Marks) (06 Marks) (07 Marks) (05 Marks) (08 Marks).