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UGC NET DEC 2012 : ELECTRONIC SCIENCE PAPER III

11 pages, 74 questions, 69 questions with responses, 92 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) ____________________________ D 88 1 2 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 on the edge of this cover page. Do not accept a booklet without sticker-seal 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 test question booklet and 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. D-88-12 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. An n-type silicon sample has a resistivity of 5 -cm at T = 300 K. If mobility is n = 1350 cm2/V-s, then donor impurity concentration is 5. If the branch in any network has a current source then the analysis is carried out by _______ analysis method. (A) mesh (B) node (C) supermesh (D) supernode 6. The transfer function of RC low-pass filter network (A) RCs/1 + RCs (B) 1/1 + RCs (C) RC/1 + RCs (D) S/1 + RCs 7. Biasing is done in class A mode to (A) save power (B) improve stability (C) reduce number of sources (D) both (B) and (C) 8. In analog computation, we use (A) both integrator and differentiator (B) only integrator (C) only differentiator (D) both in pair 9. To obtain 30% feedback factor for the circuit shown below : (A) 2.86 10 14 cm 3 (B) 9.25 1014 cm 3 (C) 11.46 1015 cm 3 (D) 1.1 10 15 cm 3 2. In a JFET, the amplification factor , transconductance gm and the dynamic drain resistance vd are related as gm (A) = v d (C) 3. vd =g m (D) = gm . vd2 The figure shown below, is symbol of (A) (B) (C) (D) 4. = gm . vd (B) P channel depletion MOSFET P-channel enhancement MOSFET Complementary MOSFET P-channel JFET If Z11 = 2 Z12 = 1 Z21 = 1 Z22 = 3 (A) R1 = 3R2 What is the determinant of admittance matrix ? (A) 0 (B) 1 (C) 5 (D) 1/5 Paper-III (B) 2R1 = 5R2 (C) 3R1 = 7R2 (D) 5R1 = 9R2 2 D-88-12 10. For IOLmax = 16 mA and IILmax = 0.0016 A, the fan-out (low) is 15. Which of the ports in 8255, in which part of the port pins can be used as input lines and part of the port pines can be used as output lines ? (A) PA (B) PB (C) PC (D) PD Which Boolean expression describes the output X in the arrangement given below : 16. Which loop structure would execute its statements atleast once even if the test condition fails for the first time itself ? (A) for (B) if-else (C) do-while (D) while (A) X = a + (b . c) 17. The expression evaluates to false in int l = 3, J =7; double f = 5.5, g = 4.5; char ch = T ; (A) (l < = 5) & & (ch = = T ) (B) (l < 8) 11 (ch = = L ) (C) (f > = 6) 11 (l . j) < 15 (D) (f + g) = = 10.011 i < 2 18. Word NEHA is to be entered in an array. Which array declaration is proper ? (A) Char name [4] = { N , E , H , A }; (B) Char name [5] = { N , E , H , A \O }; (C) Char name [4] = NEHA ; (D) Char name [4] = NEHA ; 19. A transmission line having 50 impedance is transmitted to a load of (40 + j 30) ohms. The VSWR is (A) j 0.033 (B) 0.8 + j 0.6 (C) 2 (D) 1 20. An air filled rectangular waveguide has dimensions 6 cm 4 cm. The cut off frequency for TE10 is (A) 16 (C) 11. (B) (D) 1.6 1 (B) X = a . (b + c) (C) 10 X = (a . b) + c (D) X = a + b + c 12. The largest decimal number that can be stored in a MOD-64 counter is (A) 64 (C) 13. (B) (D) 63 16 15 What is the Register address which matches with the address of the stack ? (A) 03H (C) 14. (B) (D) 13H 013H 07H In 8259, to avoid causing an interrupt due to an accidental noise pulse, the following action is done : (A) All unused interrupt lines are shorted together. (B) (C) All unused interrupt lines are connected to Vcc. All unused interrupt lines are connected to ground. (A) 2.5 GHz (C) 20.5 GHz (D) All unused interrupt lines kept open. D-88-12 3 (B) 25 MHz (D) 5 GHz Paper-III 21. An antenna, when radiating, has a highly directional radiation pattern. When the antenna is receiving, its radiation pattern (A) is more directive (B) is less directive (C) is same that of transmitting antenna (D) exhibits no directivity at all. 29. What will be the output of K-type thermocouple at 100 C ? (A) 40 V (B) 400 V (C) 4000 V (D) 4 V 30. A system is said to be stable if and only if (A) All poles lie on the right half of S. plane. (B) All poles lie in the left half of the S-plane. (C) All poles and zeros lie on the right half of S-planes. (D) Some poles lie on the half of the S-plane and some lie on the right half of the S-plane. 31. In a low level AM system, amplifiers following the modulated stage must be (A) Linear devices (B) Harmonic devices (C) Class C amplifier (D) Non linear devices A Resistance strain gauge has gauge factor of 2. It is connected to a steel member which is subjected to a strain of 1 10 6. If the original resistance value of the gauge is 130 , what is the change in resistance ? (A) 130 (B) 390 (C) 260 (D) 520 Which of the following is/are valid statement(s) ? I. AJFET has one built-in diode. II. AJFET has two built-in diode. III. The pinch off voltage of a JFET has same magnitude as that of gate voltage. IV. A JFET is a voltage controlled device. (A) I, III, IV (B) II, III,IV (C) II, III (D) II, IV The modulation index of an AM wave in changed from 0 to 1. The transmitted power is (A) unchanged (B) halved (C) doubled (D) increased by 50 percent 23. The attenuation of a single mode fibers is 0.2 dB/km, at a transmission length of 100 kms. The output signal strength is reduced to (A) 10% of transmitted power (B) 1% of transmitter power (C) 5% of the transmitted power (D) 20% of the transmitted power 28. 22. 27. 24. Indicate the false statement. The square of the thermal noise voltage generated by a resistor is proportional to (A) its temperature (B) its resistance (C) Boltzmann constant (D) the bandwidth over which it is measured 25. The output of a dc motor depends mainly on (A) Speed and torque (B) Speed and back emf (C) Speed and applied voltage (D) Speed and load resistance 26. Which one of the following is an adjustable IC voltage regulator ? (A) IC 7824 (B) IC 7912 (C) LM 338 (D) IC 7808 Paper-III 4 D-88-12 32. Is it necessary to separately define Z and Y parameters as Z can be obtained from Y and vice a versa ? I. Not necessary to define Y and Z separately as Y = 1/Z. II. Necessary as Z-parameters cannot be defined at high frequency. III. Y = 1/Z is applicable only at low frequency, so conversion is not valid under all conditions. 34. Which of the following circuit come under the class of combinational logic circuits ? I. Full Adder II. Full Subtractor III. Counter IV. Multiplexer (A) I and II are correct. (B) (C) Hybrid -model enables Z to be determined using Z = 1/Y. (A) Options I and III are correct. (B) Options II and IV are correct. (C) Options III and IV are correct. (D) Options IV and I are correct. IV. I, II, IV are correct. II, III, IV are correct. (D) I, III and IV are correct. 35. For using 8253 in counter mode from a initial value. The control world for selection of counter is done. Which of the following three pin regulators yield + 9 V output ? II. The initial value will be kept in the counter before the selection of counter. I. III. Selection of BCD mode is done. IV. 33. I. The initial value will be loaded to counter after the selection of counter. II. (A) I, III and IV are to be fulfilled. (B) I, II and III are to be fulfilled. (C) II, III and IV are to be fulfilled. (D) II, I and IV are to be fulfilled. III. 36. Which of the following statements will post increment the variable by 1 ? I. (A) (B) (C) (D) D-88-12 a = a + 1; II. a + = 1; III. IV. a + +; IV. a = + 1; (A) Options I, II, III are correct. Options I and III are correct. Options II and IV are correct. Options III and II are correct. Options IV and I are correct. (B) Options II, III, IV are correct. (C) Options I, II are correct. (D) Options III, IV are correct. 5 Paper-III 37. In optical fiber communications I. Inter modal dispersion can be avoided by using SMF. II. Inter modal dispersion can be avoided by using MMF. III. Third transmission window wavelength is used to avoid Rayleigh scattering losses. IV. 800-900 nm window is used to avoid Rayleigh s scattering losses. (A) Options II and III are correct. (B) Options II and IV are correct. (C) Options I and III are correct. (D) Options IV and I are correct. 38. Indicate the false statement. (i) HF mixers are generally noiser than HF amplifier. (ii) Impulse noise voltage is independent of bandwidth. (iii) In thermal noise, the noise power generated by a resistor, is proportional to the bandwidth. (iv) Industrial noise is not an impulse type. (A) (i) and (ii) are correct. (B) (ii) and (iii) are correct. (C) (iii) and (iv) are correct. (D) (i) and (iii) are correct. 39. For a loss-less transmission line with air as dielectric operating at 15 MHz and of length = 12 m. I. The length of transmission line in terms of = 0.6 . II. The value of phase constant is 0.1 radian/m. III. The value of phase constant is 0.2 radian/m. IV. The length of transmission line in terms of is /4. (A) Options I and II are correct. (B) Options III and IV are correct. (C) Options I and IV are correct. (D) Options II and IV are correct. Paper-III 40. During the process of milk boiling, the heater is to be put off before the bubble gets over spilled. The following controls are put in operation while switching off the heater. They are I. Only proportional II. Only integral III. proportional and derivative controls are followed. IV. Only derivative (A) I as well as II are followed. (B) I as well as IV are followed. (C) Only III is followed. (D) I, II and IV are followed. Q. Nos. 41 to 50 : Assertion Reason type questions : The following items consist of two statements, one labelled the 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 and (R) is false. (D) (A) is false and (R) is true. 41. 6 Assertion (A) : An intrinsic semiconductor is doped lightly with p-type impurity. Its conductivity decreases till a certain doping level is reached. Reason (R) : The mobility of both holes and electrons decreases. D-88-12 42. Assertion (A) : Number of mesh current equations in a network depend upon the number of branches B and nodes N in a network. Reason (R) : Number of mesh current equations are B + N 1. 43. Assertion (A) : Offsets in op-amp are introduced due to mismatch at differential input stage. The offsets change with time and temperature. Reason (R) : The offsets must be removed as they introduce noise in a.c. signals. 44. 45. 46. 47. 48. 49. Assertion (A) : Magic Tee is a 4junction hybrid Tee and displays power dividing properties in E and H plane and has advantage of being fully matched. Reason (R) : It has a hybrid junction about an imaginary plane bisecting two arms. D-88-12 7 Arrange the following configurations of BJT in the increasing order of their input impedance. I. CE II. CB III. CC IV. Darlington pair (A) III, II, IV, I (B) I, II, III, IV (C) IV, III, II, I (D) II, I, III, IV 52. Assertion (A) : The break; statement is used to exit from if statement. Reason (R) : In while (1) loop break; statement is put at the end of a loop. Assertion (A) : Due to two metal with different coefficient of expansion, when the junction is formed, the junction produces a voltage corresponding to temperature. Reason (R) : The metals which are used for making thermocouples are non homogeneous. 51. Assertion (A) : The default address, for starting the execution of the program, is from 0000H. This is valid for Intel processors. Reason (R) : The starting address of RAM is from 0000H. Assertion (A) : PIN diodes are used as photo detectors. This is achieved by doping lightly doped in material in between p and n junctions. Reason (R) : These are used because higher frequency infra-red penetrate more deeply in the semiconductor material. 50. Assertion (A) : Dual slope A/D converter is the most preferred A/D conversion technique employed in most digital multimeters. Reason (R) : Dual slope A/D converter provides high accuracy and also suppresses the HUM effect on the input signal. Assertion (A) : In the super heterodyne receiver, the signal voltage is combined with local oscillator voltage and normally converted into a signal of a lower fixed frequency. Reason (R) : The intermediate frequency of receiving system may be neither low or high, but in a certain range between the two. The sequence to the venise a network and calculate current through the load is (i) obtain VTH or RTH (ii) remove the load (iii) put VTH and RTH in series (iv) connect the load in series The correct sequence is (A) (i), (ii), (iii), (iv) (B) (ii), (i), (iii), (iv) (C) (iii), (i), (iv), (ii) (D) (iv), (iii), (i), (ii) Paper-III 53. The correct order in which data is most reliably transmitted (i) Current loop (ii) V to F conversion (iii) Voltage transmission (iv) Digital data communication (A) (iii), (i), (ii), (iv) (B) (ii), (iv), (i), (iii) (C) (i), (iv), (iii), (ii) (D) (iv), (iii), (ii), (i) 54. Consider the Analog to Digital convertion given below : I. Successive approximation ADC II. Dual-slope ADC III. Counter method ADC IV. Simultaneous ADC The correct sequence of the ascending order in terms of speed of the above ADC s are : (A) I, II, III, IV (B) II, I, III, IV (C) IV, II, I, III (D) III, II, I, IV 55. 56. 57. 58. The correct sequence of hierarchy of operators is _____. from highest to lowest. (i) or + (ii) ( ) (iii) / or * (iv) * * (A) (i), (iii), (iv) (B) (ii), (iv), (iii) (C) (ii), (iii), (i) (D) (iv), (ii), (i) Paper-III 8 Following are the steps for A to D conversion of the signal : (i) Quantization (ii) Sampling (iii) Filtering (iv) Encoding The correct sequence of A to D conversion is (A) (i), (ii), (iii), (iv) (B) (ii), (i), (iv), (iii) (C) (iv), (iii), (ii), (i) (D) (iii), (ii), (i), (iv) 59. The following operations are done during the execution of an instruction : (i) Decode (ii) Fetch (iii) Signal transfer (iv) Execute (A) (i), (ii), (iii), (iv) (B) (ii), (i), (iv), (iii) (C) (iii), (i), (ii), (iv) (D) (ii), (i), (iii), (iv) Following are the mediums of communication : (i) sea water (ii) sky waves (iii) space waves (iv) glass fibers The correct sequence of operating frequencies in increasing order are : (A) (iv), (iii), (ii), (i) (B) (i), (ii), (iii), (iv) (C) (ii), (iii), (iv), (i) (D) (iv), (ii), (iii), (i) Following are the detectors used in optical communication : (i) Photo diode (ii) Photo-transistor (iii) Avalanche photodiode (iv) Pin diode Correct sequence of gain in decreasing order is given by (A) (iii), (iv), (ii), (i) (B) (iv), (iii), (ii), (i) (C) (i), (ii), (iii), (iv) (D) (iv), (ii), (iii), (i) D-88-12 60. 61. 62. The correct sequence to be followed to build data acquisition system is by arranging the steps as follows : (i) transducer (ii) software development (iii) range of parameter (iv) signal conditioning (A) (i), (ii), (iii), (iv) (B) (iv), (iii), (ii), (i) (C) (iii), (i), (iv), (ii) (D) (ii), (iii), (iv), (i) 63. List I List II a. Duty cycle 1. Variable voltage regulator b. AGC 2. Astable multivibrator c. LM317 3. Voltage regulator d. Crow-bar protection Match List I with List II. List I List II a. Monostable 1. No-stable state multivibrator b. Astable 2. One-stable state multivibrator c. Free-running 3. Two-stable state multivibrator d. Bistable 4. Alternate high multivibrator and low output Codes : a b c d (A) 2 3 1 4 (B) 3 2 4 1 (C) 1 3 4 2 (D) 2 1 4 3 4. FET Codes : a c d 2 3 4 (B) 3 4 1 2 (C) 4 3 2 1 (D) 2 64. b (A) 1 4 1 3 Match List I with List II and select the correct answer by using the codes given below the lists : List I List II a. Multiplexer 1. Sequential memory b. De-multiplexer 2. Converts decimal number to binary Match List I with List II and select the correct answer using codes given below : List I List II a. Cut set 1. KVL b. RC-differentiator 2. Branch voltage c. Dual of KCL 3. Frequency response d. Bode plots 4. High pass filter Codes : a b c d (A) 2 4 1 3 (B) 3 2 4 1 (C) 4 3 1 2 (D) 1 2 4 3 D-88-12 Match List I with List II and select the correct answer using codes given below : c. Shift-register 3. Data Selection d. Encoder 4. Routes out many data input with single data output Codes : a c d (A) 3 4 1 2 (B) 4 3 1 2 (C) 3 4 2 1 (D) 1 9 b 2 3 4 Paper-III 65. Match the following lists with correct ones : List I List II a. QUE 1. Z flag not affected b. DX 2. Slow memory c. DCX D 3. Reg B d. MUL/DIV 4. Variable port addressing Codes : a b c d (A) 4 2 3 1 (B) 2 4 3 1 (C) 4 2 1 3 (D) 2 4 1 3 68. Match the following : List A List B a. Modem 1. Noise immunity better b. FSK 2. error correction c. Codes 3. frequency shift keying d. PCM 4. signal translator Codes : a b c d (A) 4 3 2 1 (B) 3 2 1 4 (C) 2 1 3 4 (D) 1 4 2 3 66. Match List I with List II and select the correct answer using codes given below : List I List II a. if-then 1. hex-data b. % x 2. garbage to calling function c. gets( ) 3. on-off controller d. return; 4. multi word string Codes : a b c d (A) 3 1 4 2 (B) 2 3 4 1 (C) 1 2 3 4 (D) 4 3 2 1 69. 67. Match List I with List II and select the correct answer using the codes given below : List I List II a. Wave D equation 1. H = J + dt Match List I with List II and select the correct answer using the codes given below : List I List II a. Choppers 1. pn pn devices b. SCR 2. V number c. SMF 3. Speed control of d.c. motors d. LASER 4. Quantum well Codes : a b c d (A) 3 2 4 1 (B) 3 1 2 4 (C) 4 2 1 3 (D) 4 3 2 1 70. Match the following : List I List II a. 3 digit 1. Guarding/shielding b. Pt 100 2. Bridge H 2. . D = E Gauss s Law 3. Poynting vector Ampere s Law 1 2E 4. 2 = 2 E C t2 Codes : a b c d (A) 4 3 2 1 (B) 3 4 2 1 (C) 1 2 3 4 (D) 4 2 3 1 Paper-III b. c. d. c. RTD 3. Temperature d. Interference 4. DVM Codes : a b c d (A) 1 2 3 4 (B) 4 3 2 1 (C) 3 1 4 2 (D) 3 4 1 2 10 D-88-12 71. Expansion of ASIC is : (A) Applied Science Integrated Circuit. (B) Application Specific Integrated Circuit. (C) Application Specific Internal Circuit. (D) Application of Science and Integrated Circuit. 72. 8 bit date lines is not employed by the following processor : (A) 8080 (B) 8085 (C) 8086 (D) 8051 73. Which one is not enhanced feature inspite of VLSI advances ? (A) Pipelining (B) Branch prediction (C) Power consumption (D) Cache 74. Which of the following is not signal processing ? (A) Date filtering (B) Convolution (C) Noise addition (D) Date storing 75. The World s first microprocessor, Expansion of RISC : (A) Reduced Integrated Systems Circuit (B) Reduced Instructions Set Computer (C) Reduction Integrated System Computer (D) Reduced Instructions System Circuit 4004, was introduced by Intel in 1968. It was a 4 bit processor, but later it has introduced a new processor almost every year, like 8080, 8085, 8086, 8031 and 8051. Only 8086 processor handles 16 bit data and a micro computer was developed based on this processor. Intel also introduced 80186, 80286, 80386, 80486 and made possible to get mini computers and personal computers. Other companies like Texas instruments, Motorola, Zilog and Analog devices have specialized in signal processing processors, communication oriented processors, better architectural processor, and discrete signal processing devices. All the advancements mentioned above are made possible because of continuous upgradation of VLSI technology. Some of the features like cache, pipelining and branch prediction have contributed for improving performance parameters, like execution speed, large memory, fast data transfers and reduction in number of instructions. A transformation has been seen from CISC to RISC. Identification of application and its potential for marketing provides the opportunity to companies to produce ASICs sometimes. Digital Signal Processors are employed for processing streamed data of either voice or video data. D-88-12 11 Paper-III Space For Rough Work Paper-III 12 D-88-12

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