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UGC NET SEP 2013 : ELECTRONIC SCIENCE PAPER III

11 pages, 75 questions, 35 questions with responses, 37 total responses,    0    0
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PAPER-III ELECTRONIC SCIENCE Signature and Name of Invigilator 1. (Signature) __________________________ OMR Sheet No. : ............................................... (To be filled by the Candidate) (Name) ____________________________ 2. (Signature) __________________________ (Name) ____________________________ 88 S 1 3 1 Time : 2 /2 hours] Number of Pages in this Booklet : 12 Instructions for the Candidates 1. Write your roll number in the space provided on the top of this page. 2. This paper consists of seventy five multiple-choice type of questions. 3. At the commencement of examination, the question booklet will be given to you. In the first 5 minutes, you are requested to open the booklet and compulsorily examine it as below : (i) To have access to the Question Booklet, tear off the paper seal / polythene bag on the booklet. Do not accept a booklet without sticker-seal / without polythene bag and do not accept an open booklet. (ii) Tally the number of pages and number of questions in the booklet with the information printed on the cover page. Faulty booklets due to pages/questions missing or duplicate or not in serial order or any other discrepancy should be got replaced immediately by a correct booklet from the invigilator within the period of 5 minutes. Afterwards, neither the Question Booklet will be replaced nor any extra time will be given. (iii) After this verification is over, the OMR Sheet Number should be entered on this Test Booklet. 4. Each item has four alternative responses marked (A), (B), (C) and (D). You have to darken the circle as indicated below on the correct response against each item. Example : where (C) is the correct response. 5. Your responses to the items are to be indicated in the OMR Sheet given inside the Booklet only. If you mark at any place other than in the circle in the OMR Sheet, it will not be evaluated. 6. Read instructions given inside carefully. 7. Rough Work is to be done in the end of this booklet. 8. If you write your Name, Roll Number, Phone Number or put any mark on any part of the OMR Sheet, except for the space allotted for the relevant entries, which may disclose your identity, or use abusive language or employ any other unfair means, you will render yourself liable to disqualification. 9. You have to return the original OMR Sheet to the invigilators at the end of the examination compulsorily and must not carry it with you outside the Examination Hall. You are however, allowed to carry duplicate copy of OMR Sheet on conclusion of examination. 10. Use only Blue/Black Ball point pen. 11. Use of any calculator or log table etc., is prohibited. 12. There is no negative marks for incorrect answers. S-88-13 Roll No. (In figures as per admission card) Roll No.________________________________ (In words) [Maximum Marks : 150 Number of Questions in this Booklet : 75 1. 2. - 3. , - - , : (i) - / - / (ii) - / - - (iii) OMR - 4. (A), (B), (C) (D) : (C) 5. OMR OMR , 6. 7. (Rough Work) 8. OMR , , , , , 9. OMR OMR 10. / 11. ( ) 12. 1 P.T.O. ELECTRONIC SCIENCE Paper III Note : This paper contains seventy five (75) objective type questions of two (2) marks each. All questions are compulsory. 1. 2. 3. In UJT, the value of stand-off ratio is (A) 0.2 (B) 0.4 (C) 0.7 (D) 0.98 5. 6. (B) Bubbled NOR gate (D) Bubbled XOR gate 8. The INTR pin in 8086 is a (A) Non-maskable interrupt (B) Maskable interrupt (C) Priority interrupt (D) None of the above 9. 8085 microprocessor does not have (A) Zero flag (D) h21 = h12 (B) Sign flag (C) An Op-Amp behaves like an ideal OpAmp upto (A) Hz (B) 5 KHz (C) 5 MHz (D) 50 MHz Parity flag (D) Overflow flag 10. If the gain of an ideal amplifier decreases, the bandwidth (A) increases (B) decreases (C) remains zero (D) remains unaltered Which mode of 8253 acts as a square wave generator ? (A) Mode-1 (B) Mode-2 (C) Mode-4 (D) Mode-3 11. To use as a memory, which one of the following is more suitable ? (A) Monostable multivibrator (B) Bistable multivibrator (C) Astable multivibrator (D) Schmitt trigger Paper-III Bubbled OR gate (C) The condition for a two-port network to be reciprocal is (A) Z11 = Z22 (B) Y21 = Y22 h21 = h12 NAND gate is also called as (A) Bubbled AND gate Tunnel diode is basically a junction diode with (A) High doping in P-region alone (B) High doping in p and n regions, both (C) High doping in n region alone (D) Low doping in both P and n regions (C) 4. 7. Which of the following program is not a utility ? (A) Debugger (B) Spool (C) Editor (D) Inhibit 2 S-88-13 12. Modulation is a process of (A) Reducing distortions (B) Improving thermal stability (C) Combining audio and radio frequency waves at the transmitter (D) Generating constant frequency waves 18. (A) Square waveform (B) Sine waveform (C) Saw tooth waveform (D) Staircase waveform 19. 13. The time base of a CRO is controlled by Which type of modulation causes envelope distortion of a base band signal ? (A) Amplitude modulation (B) Frequency modulation (C) Phase modulation (D) Angle modulation Routh Hurwitz criterion gives (A) Phase-details (B) Marginal stability (C) Relative stability (D) Absolute stability 20. Photo diode is reverse biased because (A) only one side is illuminated 14. 15. Poynting vector for an EM wave is (A) H E (B) H E (C) E H (D) E H (B) (C) 21. The Reflex Klystron can be used as (A) Amplifier only (B) Oscillator only (C) Both amplifier and oscillator (D) Neither amplifier nor oscillator For PCM, the bandwidth required to transmit a voice channel is (B) (D) 64 KHz 64 MHz 5 KHz In SCR s snubber circuits employ (A) Inductor only (B) A combination of R and L (C) A combination of R and C (D) Resistance only Step down regulator produces an output (A) low voltage and low current (B) low voltage at high current (C) high voltage at low current (D) high voltage at high current S-88-13 as (C) 23. 17. as (A) 20 KHz 22. 16. reverse current is small compared to photo current (D) reverse current is large compared to photo current When microwave signals flow through the curvature of the earth, it is called (A) Duct position (B) Faraday s effect (C) Raman scattering (D) Ionospheric scattering majority carriers flow under these conditions. In optical fiber communication systems, FBG is used for (A) Dispersion compensation (B) Long haul communication (C) Non-linearity management (D) Source 3 Paper-III 24. In an SCR, dual converter circuit 28. (A) 1 + 2 = 90 For the Z-transform X(z) = 4z2 + 2 + 3z 1, 0 < |z| < x(n) is given by (B) 1 + 2 = 180 (A) x(n) = 4 [n 2] + 2 [n] + 3 [(n + 1)] (C) 1 + 2 = 270 (B) x(n) = 4 [n + 2] + 2 + 3 [n 1] (C) x(n) = 4 [n + 2] + 2 [n] + 3 [n + 1] (D) 1 + 2 = 135 25. (D) x(n) = 4 [n 2] + 2 [n 1] + 3 In the given circuit, power delivered to resistor R is 29. An amplifier has an open loop gain of 100 and its lower and upper hand frequency of 100 Hz and 100 KHz, respectively. A feedback network with a feedback factor of 0.99 is connected to the amplifier, the new lower and upper cut off frequencies are at (A) 15 W (A) fH = 10 MHz and fL = 1 Hz (B) 15 W (B) fH = 25 MHz and fL = 10 Hz (C) 0W (C) fH = 100 MHz and fL = 100 Hz (D) unless R is known, cannot determined 26. (D) fH = 10 MHz and fL = 10 Hz 30. The Laplace transform of sin2 3t is given by (A) 18 + 36) How many flip-flops are required to build a digital counter to count from 0 to 1024 ? s(s2 (A) 11 (B) (B) 6 2 (s + 36) (C) (D) 24 (C) 18(s + 6) s(s2 + 36) 31. Negative feedback in amplifier results in (i) Reduced voltage gain (ii) 1 (D) 2 6s(s + 36) 27. 10 6 Reduced sensitivity (iii) Decreased bandwidth (iv) Reduced distortion The Fourier Transform of a Gaussian time pulse is Of these statements : (A) Uniform (A) (i) and (ii) are correct (B) A pair of impulse (B) (i), (ii) and (iii) are correct (C) Gaussian (C) (i), (ii) and (iv) are correct (D) (i) and (iv) are correct (D) Rayleigh Paper-III 4 S-88-13 32. Consider the following statements : 1. Figure of merit and CMRR are the same parameters. 2. In an Op-Amp CMRR is very high approaching to infinity. 3. The input stage of an Op-Amp is usually a differential amplifier (A) 1, 2, 3 are correct (B) 2 and 3 are correct (C) 1 and 2 are correct (D) 1 and 3 are correct 33. Consider the following statements with respect to ECL gates : (i) ECL represents nonsaturated logic (ii) ECL circuits are easy to interconnect with circuits of other families. (iii) ECL family employs differential amplifier circuitry. (iv) ECL has the unique feature of providing two outputs which are complementary to each other. Among the above, which statements are correct ? (A) (i), (ii) & (iii) (B) (ii), (iii) & (iv) (C) (ii), (iv) & (i) (D) (i), (iii) & (iv) 34. 35. 36. Consider the statements : (i) Waveguide acts as a high pass filter. (ii) Coaxial cables are used to excite the waveguides. (iii) TEM mode exists as dominant mode (iv) Propagation constant is given by m 2 n 2 a + b + w2 Which of these is correct ? (A) (i) & (ii) (B) (ii) & (iii) (C) (iii) & (iv) (D) (i), (ii) & (iv) 37. A multiplexer : (i) Selects one of the several inputs and transmits to a single output. (ii) Routes the data from a single input to one of many outputs. (iii) Converts parallel data into serial data. (iv) It is a combinational circuit. Which one of the following is correct ? (A) (i), (ii) & (iv) (B) (ii), (iii) & (iv) (C) (i), (iii) & (iv) (D) (i), (ii) & (iii) S-88-13 Audio signals are not transmitted by EM waves because (i) Antennas used will be unimaginably lengthy (ii) Audio signals do not radiate (iii) Interference is due to simultaneous transmissions. (iv) Usable frequency range is too low and narrow. Which of the following is correct ? (A) (i) & (ii) (B) (ii) & (iii) (C) (i) & (iii) (D) (i), (iii) & (iv) 5 Consider the following statements : (i) LCD essentially acts as a capacitor. (ii) LCD has slow decay time. (iii) LCD s appear invisible in darkness. (iv) Twisted nematic LCD segment appears black when its is in ON condition. Which is valid one ? (A) Statements (i) and (ii) (B) Statements (ii) and (iii) (C) Statements (ii), (iii) and (iv) (D) Statements (i), (ii), (iii) and (iv) Paper-III 38. Consider the following statements : B (i) E = t (ii) Et1 = Et2, Dn1 = Dn2 Assertion-Reason type questions : Q. 41 to 50 : The following items consist of two statements, one labelled as Assertion (A) and the other labelled the Reason (R) . You are to examine these two statements and decide if the Assertion (A) and the Reason (R) are individually true and if so, whether the Reason is a correct explanation of the Assertion. Select your answers to these items using the codes given below and mark your answer sheet accordingly. Codes : (A) Both (A) and (R) are true and (R) is the correct explanation of (A). (B) Both (A) and (R) are true, but (R) is not the correct explanation of (A). (C) (A) is true but (R) is false. (D) (A) is false and (R) is true. (iii) C = ( C) + 2C (iv) V 0 Which is valid one ? (A) All are correct (B) (i) and (ii) are correct (C) (i), (ii) and (iii) are correct (D) (i), (ii) and (iv) are correct 39. 40. Consider the following statements : (i) Rayleigh Scattering losses are 1 proportional to 4 ( ) (ii) The operating frequency of optical fiber is 193 T Hz (iii) In III transmission windows, the attenuation is 5 dB/km. Which one is correct ? (A) (i) and (ii) (B) (ii) and (iii) (C) (i) and (iii) (D) (i), (ii) and (iii) 41. 42. Consider the following statements in connection with Electrodynamometer type instruments : (i) They serve as transfer instrument. (ii) They exhibit square law response. (iii) They are free from hysteresis. (iv) They have eddy current damping. Which are valid ? (A) (i), (ii), (iv) (B) (i), (ii), (iii) (C) (ii), (iii), (iv) (D) (i), (ii), (iii), (iv) Paper-III Assertion (A) : A step graded junction is formed when there is an abrupt change from acceptor ion on one side to donor ions on the other side. Reason (R) : In step graded junctions, donor and acceptor concentrations are unequal and these junctions behave as asymmetrical junctions. Assertion (A) : For a positive real function, N(s) must not have any poles in the right half plane. Reason (R) 43. 6 : Re [N(jw)] 0 for all w Assertion (A) : In common collector amplifier, voltage gain is greater than unity and this configuration is called as Emitter follower. Reason (R) : Common collector stage is used for impedance matching as its input impedance is very large as compared to output impedance. S-88-13 44. Assertion (A) : The TTL 54/74 ALS family has smallest delay power product. 48. Reason (R) : Power consumption in TTL 54/74 ALS is reduced as there is decrease in resistance values and consequently current reduction. Reason (R) : These devices do not work on avalanche breakdown principle. 49. 45. Assertion (A) : The CALL instruction is used to transfer program control to a subprogram or subroutine. Assertion (A) : PIN diodes have wider depletion region, in order to allow light to penetrate more deeply in the semiconductor material. Reason (R) : III-V semiconductor materials are used to fabricate in order to allow shorter wavelength in the region of 400-700 nm. Reason (R) : The instruction pushes the current programme counter contents on to the stack and loads the given address into the PC, and program control is transferred to the given address in the instruction. 46. Assertion (A) : Silicon controlled rectifiers are PNPN devices, having gate as controlling input. 50. Assertion (A) : Transmission lines are nothing but guided conducting structures which are used in power distribution at low frequencies, in communications and computer networks at higher frequencies. Assertion (A) : The DO-WHILE statement is used less frequently than the while statement. Reason (R) : For most applications, it is more natural to test for continuation of a loop at the beginning rather than at the end of the loop. Reason (R) : Equivalent circuit of the transmission line is 51. Arrange the following in order of increasing wavelength of output wave : 1. 2. Laser diode operating in 3rd transmission window The correct order is Assertion (A) : In quadrature detectors, the two signals are said to be in quadrature if they are at 45 angle. (A) 3, 2, 1 (B) 2, 3, 1 (C) Reason (R) : Quadrature detectors are used to demodulate the FM signals. S-88-13 Nd:YAG laser 3. 47. He-Ne laser 1, 3, 2 (D) 1, 2, 3 7 Paper-III 52. Arrange the following in terms of increasing Delay Power Product : 1. TTL 74 AS 2. TTL 74 LS 3. CMOS-74 C 4. ECL 100 K The correct sequence is (A) 4, 3, 1, 2 (B) 4, 1, 2, 3 (C) 3, 1, 2, 4 (D) 1, 2, 3, 4 53. Arrange the following increasing frequency : 1. UHF 2. 3. Sky waves 4. The correct sequence is (A) 3, 1, 2, 4 (B) (C) 4, 3, 2, 1 (D) 54. 56. In a telemetry system, the correct sequence of transmission system is given by : 1. Information 2. Sensor and signal conditioning 3. Quantisation 4. Encoding 5. Antenna The correct sequence is (A) 5, 1, 2, 3, 4 (B) 1, 2, 3, 4, 5 (C) 2, 3, 4, 5, 1 (D) 5, 4, 3, 2, 1 57. Arrange the following in order of increasing the input impedances : 1. BJT CE stage 2. BJT in CB stage 3. BJT in CC stage 4. CMOS The correct sequence is given by (A) 2, 1, 3, 4 (B) 4, 2, 1, 3 (C) 4, 3, 2, 1 (D) 3, 1, 2, 4 58. For finding the inverse of a z-transform : 1. Partial fraction expansion 2. Contour integration 3. Convolution 4. Power series expansion Following is the correct sequence : (A) 1, 2, 3, 4 (B) 1, 2, 4, 3 (C) 4, 3, 2, 1 (D) 1, 3, 4, 2 59. For measuring VSWR, 1. Microwave source 2. Detector amplifier 3. Meter 4. Slotted section 5. Variable attenuator The correct sequence is (A) 1, 5, 4, 2, 3 (B) 3, 2, 1, 5, 4 (C) 4, 1, 2, 3, 5 (D) 1, 2, 3, 4, 5 in terms of X-Band X-rays 1, 4, 3, 2 2, 3, 1, 4 Arrange the following in decreasing order of length : 1. 1 mil 2. 1 nm 3. 1 picometer 4. 1 femtometer The correct sequence is (A) 4, 3, 2, 1 (C) 55. (B) (D) 4, 3, 1, 2 2, 1, 3, 4 1, 2, 3, 4 There are following blocks : 1. Antenna and RF stage 2. Mixer with Local oscillator 3. Amplifier (class C) 4. IF amplifier 5. Detector The correct sequence of receiver section is (A) 1, 2, 3, 4, 5 (B) (C) (D) 1, 2, 4, 5, 3 Paper-III 1, 2, 4, 3, 5 5, 1, 2, 3, 4 8 S-88-13 60. Arrange the following in order of increasing frequency : 1. L band 2. S band 3. C band 4. K band The correct sequence is (A) 4, 1, 2, 3 (B) 4, 3, 2, 1 (C) 1, 3, 4, 2, (D) 1, 2, 3, 4 61. Match the following lists : List I List II a. Early effect i. IC Fabrication b. Masking ii. JFET c. Enhancement iii. MOSFET d. Pinch off iv. Transistor The correct match is a b c d (A) i ii iv iii (B) i iii ii iv (C) iv iii i ii (D) iv i iii ii 62. 63. 64. d. Transmission iv. parameters The correct match is a b c (A) iv iii i (B) iii i ii (C) i ii iv (D) ii iv ii S-88-13 Stability d ii iv iii i 9 Match the following lists : List I List II a. IC 7410 i. Hex Inverter b. IC 7404 ii. Quad 2 input OR gate c. IC 7432 iii. JK master slave flip flop d. IC 7472 iv. Triple 3-input NAND gate The correct match is a b c d (A) iv ii i iii (B) iv i ii iii (C) i ii iii iv (D) ii iv i iii 65. Match the following lists : List I List II a. Zeroes & Poles i. Linear elements b. Ramp ii. ABCD 1 c. Super position iii. 2 S Match the following lists : List I List II a. Virtual ground i. Time constant L ii. Q-factor b. R WL iii. Op-Amp c. R d. Intrinsic stand- iv. UJT off ratio The correct match is a b c d (A) ii i iii iv (B) iii iv i ii (C) iii i ii iv (D) iv i ii iii Match the following lists : List I List II a. IC 8051 i. Stack b. Nonii. Implied addressing maskable mode c. PUSH iii. TRAP d. CMA iv. Microcontroller The correct match is a b c d (A) iv iii i ii (B) iv ii i iii (C) iii i ii iv (D) ii iii iv i Paper-III 66. Match the following lists : List II List I Match the following lists : List I List II a. Slip i. Relaxation oscillator b. SCR ii. Class-E chopper c. UJT iii. Two-transistor model d. dc drives iv. Induction motors a. E i. Zero b. H ii. 68. D iii. J+ c. ( E) t B iv. t d. D The correct match is a The correct match is given by b c d a b c d (A) i ii iii iv (A) ii iii iv i (B) iii iv i ii (B) iv ii iii i (C) ii iii i iv (C) iv iii i ii (D) iv iii i ii (D) i ii iii iv 69. 67. Match the following lists : List I Match the following lists : List I a. Intermodal dispersion i. b. Foster ii. Seley discriminator Frequency modulation c. Varacter diode ii. SMF (Single Mode Fiber) iii. III-V group d. Direct iv. MMF (Multimode band gap Fiber) semiconductors iii. FM detection d. Vestigial side band Lasers c. Intramodal dispersion TV transmission i. b. Chirp List II a. Envelope detector iv. AM demodulation The correct match is The correct match is given by a b c d (A) iv i ii iii iv (B) iii iv i ii iii i (C) ii i iii iv iv iii (D) i ii iii iv a b c d (A) iv iii ii i (B) i ii iii (C) ii iv (D) i ii Paper-III List II 10 S-88-13 70. Match the following lists : List I List II a. LVDT i. Speed b. Techoii. Resistance generators c. Wheatstone iii. Displacement Bridge d. Bourdon iv. Pressure tube The correct match is given by a b c d (A) i ii iii iv (B) iii i ii iv (C) i iii ii iv (D) iii ii i iv 71. (B) gallium arsanide (C) silicon (D) metal semiconductor junction 72. Indicate which of the following diodes does not use negative resistance in its operation : (A) Backward (B) Gunn (C) IMPATT (D) Tunnel Read the following paragraph and answer the questions 71 to 75 : 73. Response time of PIN diode is of the order of (A) 0.1 ns Gunn effect is instrumental in the generation of microwave oscillations in bulk semiconductor material. The effect was exhibited by gallium arenide. The effect is a bulk property of semiconductors. If a small dc voltage is placed across a thin slice of germanium arsanide a negative resistance will manifest itself under certain conditions. The voltage gradient across the slice is increase of about 3300 v/cm, oscillations will then occur at microwave frequencies if the slice is connected to a suitably tuned circuit. The Gunn effect is independent of total voltage or current and is not effected by magnetic field, it occurs in n-type of materials only. (B) 1 ns (C) 10 ns (D) 1 milli.sc 74. PIN diode is used as (A) sine wave modulator (B) triangular wave modulator (C) square wave modulator (D) low frequency rectifier 75. The PIN diode consists of a narrow layer of ptype semiconductor separated from an equally narrow layer of n type material. In PIN diode silicon tend to be the main material. The PIN diode is used for microwave power switching, limiting and modulation. S-88-13 The transferred-electron bulk effect occurs in (A) germanium One of the following microwave diodes is suitable for very low-power oscillator only. (A) Tunnel (B) Avalanche (C) Gunn (D) IMPATT 11 Paper-III Space For Rough Work Paper-III 12 S-88-13

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