M.Tech. Instrumentation paper/PU

OCET 2009Code No.: 209101Important : Please consult your Admit Card / Roll No. Slip before filling your Roll Number on the Test Bookletand Answer Sheet.Roll No. In Figures In Words

O.M.R. Answer Sheet Serial No.Signature of the Candidate :

Paper : ISubject : M.Tech. (Instrumentation)Time : 90 minutes Number of Questions : 75 Maximum Marks : 75

DO NOT OPEN THE SEAL ON THE BOOKLET UNTIL ASKED TO DO SOINSTRUCTIONS1. Write your Roll No. on the Question Booklet and also on the OMR Answer Sheet in the space provided

and nowhere else.2. Enter the Subject and Code No. of Question Booklet on the OMR Answer Sheet. Darken the

corresponding bubbles with Black Ball Point / Black Gel pen.3. Do not make any identification mark on the Answer Sheet or Question Booklet.4. To open the Question Booklet remove the paper seal (s) gently when asked to do so.5. Please check that this Question Booklet contains 75 questions. In case of any discrepancy, inform the

Assistant Superintendent within 10 minutes of the start of test.6. Each question has four alternative answers (A, B, C, D) of which only one is correct. For each question,

darken only one bubble (A or B or C or D), whichever you think is the correct answer, on the Answer Sheetwith Black Ball Point / Black Gel pen.

7. If you do not want to answer a question, leave all the bubbles corresponding to that question blank in theAnswer Sheet. No marks will be deducted in such cases.

8. Darken the bubbles in the OMR Answer Sheet according to the Serial No. of the questions given in theQuestion Booklet.

9. If you want to change an already marked answer, erase the shade in the darkened bubble completely.9. Negative marking will be adopted for evaluation i.e., 1/4th of the marks of the question will be deducted

for each wrong answer. A wrong answer means incorrect answer or wrong filling of bubble.10. For calculations, use of simple log tables is permitted. Borrowing of log tables and any other material is not

allowed.11. For rough work only the sheets marked “Rough Work” at the end of the Question Booklet be used.12. The Answer Sheet is designed for computer evaluation. Therefore, if you do not follow the instructions

given on the Answer Sheet, it may make evaluation by the computer difficult. Any resultant loss to thecandidate on the above account, i.e., not following the instructions completely, shall be of thecandidate only.

13. After the test, hand over the Question Booklet and the Answer Sheet to the Assistant Superintendent on duty.14. In no case the Answer Sheet, the Question Booklet, or its part or any material copied/ noted from this

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M.Tech. (Instrumentation)/209101

M.Tech. (Instrumentation)/209101 1 [Turn over

1. A coupling technique used on circular connectors where pins on connector shell engage in spiralledgrooves in the mating connector shell(A) Bayonet coupling (B) Threaded coupling(C) Leaf coupling (D) Hamburger coupling

2. Locking coil is found in a type of instrument(A) Relay (B) Pmmc(C) PIRANI Gauge (D) Strain gauge

3. A relay in which contacts operate after a preset time delay after the relay is energized is called a clockwork timer(A) 555 Timer (B) Clock Work Timer(C) 556 Timer (D) Crystal Oscillator

4. When we talk about node voltage analysis matrix formulation, we talk about(A) Impedance matrix (B) Admittance matrix(C) Laplace Transform (D) Z-parameters

5. The impedance curve of a series R-L-C network(A) Never passes through origin (B) Always cuts the frequency axis(C) Lies in the 1st & 4th quadrant (D) Lies in the 2nd & 3rd quadrant

6. The minimum and maximum magnitude of impedance in a series R-L-C circuit are(A) zero & infinity respectively (B) R & infinity respectively(C) zero & R respectively (D) infinity and infinity respectively

7. SCRs are connected in series to enhance(A) Their overall dv/dt rating (B) Their voltage rating(C) Their current handling capacity (D) Their firing frequency

8. While connecting SCRs in series, the individual SCRs chosen for the purpose should have closelymatched(A) di/dt rating (B) reverse biased characteristics(C) forward & reverse blocking characteristics (D) forward ON state characteristics

9. A UJT relaxation oscillator ckt. produces a sawtooth like wave form(A) at B1 terminal (B) at B2 terminal(C) across the capacitor (D) across the E

10. Which is the symbol of a photodiode ?

(A) (B)

(C) (D)

11. When you are looking for an ultra low noise performance and the frequency of operation is 1 kHz, youwould opt for...photodiode.(A) Photoconductive (B) Photovoltaic(C) Photoemissive (D) Photoresistive

12. A photodiode with a comparatively larger responsivity is ......... sensitive.(A) More (B) Less(C) Infinitely (D) Not

V

VV

VV

M.Tech. (Instrumentation)/209101 2

13. According to Barkhausen-Criterion for the sustained oscillations :(A) BA < 1 (B) BA > 1(C) BA = 1 (D) BA = 0

14. Most popular oscillator configuration for the audio applications is(A) Hartley oscillator (B) Colpitt’s oscillator(C) Wein-bridge oscillator (D) R-C phase shift oscillator

15. Pick the odd-one out(A) Hartley oscillator (B) Colpitt’s oscillator(C) Clapp oscillator (D) Wein-bridge oscillator

16. If the total charging & discharging resistance in an astable mode IC555 circuit is (R) each & the timingcapacitor is (C), the frequency of operation (f) is given by(A) f = 0.724/RC (B) f =1.38RC(C) f =0.69 RC (D) f = 1/0.69 (2R)

17. The pulse width in an 555 monostable multivibrator is given by(A) 0.69RC (B) 1.1 RC(C) RC (D) 1.38 RC

18. One of the following type numbers is not an IC timer(A) 555 (B) XR-2240(C) 556 (D) 558

19. Which among following is not a voltage regulator ?(A) LM 317 (B) LM 7915(C) LM 7805 (D) LM 74373

20. MC7924C provides the voltage of(A) 24 Volts (B) 0 - 24 Volts(C) – 24 Volts (D) 0 - 12 Volts

21. What comes immediately after FFEFh ?(A) FFF0h (B) FFFFh(C) 10000h (D) FFDFh

22. Convert the decimal no. 75 to binary no.(A) 101011 (B) 1001011(C) 1101000 (D) 1010011

23. Find the 1's complement of FFh(A) 10h (B) FEh(C) 00h (D) 01h

24. Add the binary nos. 110101+10010 and the result is(A) 1000111 (B) 000111(C) 1000110 (D) 100110

25. Add the octal nos. 13+6 and the result is(A) 19 (B) 21(C) 20 (D) 10


26. By adding the decimal nos. 536 & 312 the Excess-3 BCD notation is(A) 0101 0011 0110 (B) 0011 0001 0010(C) 1000 0100 1000 (D) 1000 0010 1000

27. Adding 2h to FEh yields(A) FFh (B) FE1h(C) FF1h (D) 100h

28. Half adder circuit can be used to ....... binary digits only(A) 2 (B) 3(C) 4 (D) 1

29. A NOR gate is equivalent to a bubbled AND gate. This statement is a result of(A) DeMorgan's theorems (B) Involution Law(C) Absorption Law (D) Idempotent Law

30. The proof of one of the Idempotent law lies in the principle of operation of(A) an OR gate (B) a NAND gate(C) a NOR gate (D) EX-OR gate

31. In an R-S flip-flop with active LOW inputs, when R=S=0, output Q with CLK is(A) 0 (B) 1(C) Indeterminate (D) 0 if it was 1 earlier & 1 if it was 0 earlier

32. D type flip-flop is used in(A) 74165 (B) 74LS373(C) 4051 (D) 74LS74

33. Flip-flops are the basic building blocks of .......logic circuits(A) Sequential (B) Combinational(C) Registers (D) Counters

34. The shift register belongs to the class of(A) sequential logic ckts. (B) combinational logic ckts(C) None of these (D) Shift register array

35. Minimum no. of flip-flips required to contruct a BCD decade counter is(A) 4 (B) 3(C) 10 (D) 7

36. A 4-bit binary no 1010 is to be loaded in a 4-bit serial-in serial-out register feeding in 1st the MSB. Whatwill be the logic status of the true output of the output flip-flop at the end of 6 clock cycles ?(A) 0 (B) 1(C) Indeterminate (D) enabled in all States

37. A parallel or flash type 6-bit A/D converter requires........comparators at input.(A) 63 (B) 32(C) 64 (D) 7

38. The A/D converter type that is widely used in digital voltmeter applications is the(A) Successive Approximation Type (B) Counter Type(C) Dual Slope Integrating Type (D) Flash Type


39. Out of the following, the fastest A/D converter is(A) Counter Type (B) Successive Approximation Type(C) Dual Slope Integrating Type (D) Flash type

40. A counter does not constitute a building block in one of the A/D converter types.(A) Successive Approximation Type (B) Tracking Type(C) Dual Slope Integrating Type (D) Flash or Simultaneous Type

41. Name the only IMPACT Printer(A) Ink-jet Printer (B) Electrostatic Printer(C) Laser Printer (D) Ball Printer

42. Out of the following, identify the Printer with best print quality(A) Dot-Matrix Printer (B) Daisy-wheel Printer(C) Thermal Printer (D) Electrostatic impact printer

43. Data bus is(A) bi-directional (B) Uni-directional(C) Multiplexed (D) Multi-directional

44. Address bus communicates only between(A) CPU and Primary memory (B) CPU, memory and internal registers(C) CPU and Peripherals (D) Peripherals and internal registers

45. The central processing unit (CPU) consists of(A) Arithmetic Logic Unit (ALU), control unit (B) ALU, control unit and timings CKTS(C) ALU, timing CKTS (D) Memory

46. In a modulation system, the modulating voltage remains the same, modulation index is halved when themodulating frequency is doubled, the system is(A) AM (B) FM(C) PM (D) Any one of the three

47. The commonly employed communication system for commercial radio broadcast in India is(A) FM (B) PCM(C) PM (D) AM

48. Armstrong modulator generates(A) AM signal (B) FM signal(C) PM signal (D) PCM signal

49. A pulse width modulated signal can be generated by(A) An astable Multivibrator (B) A monostable Multivibrator(C) Integrating the signal (D) Differentiating the PPM signal

50. Quantizing noise occurs in(A) Time division multiplex (B) Frequency division multiplex(C) Pulse code modulation (D) Pulse position modulation

51. In a broadcast communication receiver, most of the receiver selectivity is achieved in(A) RF section (B) IF section(C) Mixer section (D) Receiver section


52. An antenna is a device(A) That converts e-m energy into RF signal(B) That converts RF signal into em energy(C) That converts guided e-m waves into free space waves and vice-versa(D) That converts all e-m waves into free space waves

53. An antenna should have(A) A very high SWR (B) A very small SWR(C) A moderate value of SWR (D) None of these

54. The input impedance of centre-fed half-wave dipole is(A) 300 Ω (B) 288 Ω(C) 75 Ω (D) 750 Ω

55. Which of the following is most suitable for measuring AC only ?(A) PMMC type (B) Moving iron type(C) Dynamometer type (D) Induction type

56. In a Wheatstone bridge, null is obtained when(A) P/Q = R/S (B) P/Q = S/R(C) P/R = S/Q (D) None of these

57. Which would be used for measuring a resistance value likely to be between 0.01 ΩΩΩΩΩ and 0.1 Ω ?Ω ?Ω ?Ω ?Ω ?(A) Wheatstone bridge (B) Kelvin double bridge(C) Loss of charge method (D) Meggar

58. All analog meters used for measuring currents, voltages & resistances are(A) Current meters (B) Voltmeters(C) Ohm-meters (D) Multimeters

59. The sensitivity of Wheatstone bridge is maximum when(A) P/Q = R/X (B) R =X, P = X(C) P = Q = R = X = G (D) P/Q = X/R

60. Which measures the capacitance in terms of the capacitance ?(A) De Saughty Bridge (B) Schering Bridge(C) Hay's Bridge (D) Maxwell-Wein Bridge

61. Multimeters can be used to measure(A) Resistance only(B) Resistance, Current, Voltage(C) Resistance (both A.C. & D.C.) and voltage (both A.C. & D.C.)(D) Current and Voltage only

62. A Cathode-Ray-Oscilloscope (CRO)(A) Is another name of CRT (B) Is different from cathode ray tube(C) Is a CRT with some additional circuitry (D) Is used in LCD displays

63. The time-base signal is a(A) Sinusoidal signal of high frequency (B) Triangular waveform(C) Variable frequency saw tooth signal (D) Square wave


64. Quality factor (Q-factor), in general, is defined as(A) ω L/R (B) 1/ω RC(C) Power stored/Power lost (D) Power dissipated/ Power stored

65. A high Q-factor coil has(A) A flat response (B) A response with lower BW(C) A higher power loss (D) A peaked response

66. The gauge factor of a resistance wire stain gauge is a measure of(A) Sensitivity of gauge (B) Dynamic range of displacement measurement(C) Resolution (D) Voltage response

67. Which material constant determines the gauge factor of resistance wire strain gauge ?(A) Young's modulus of elasticity (B) Poisson's Ratio(C) Resistivity (D) Thermal conductivity

68. The operation of a thermocouple is based on(A) Seebeck Effect (B) Peltier Effect(C) Thomson Effect (D) Faraday's Law

69. All induction type transducers are based on(A) Faraday's Law (B) Peltier Effect(C) Thomson Effect (D) Seebeck Effect

70. Pick the odd one out(A) Pirani Gauge (B) Thermocouple Gauge(C) Thermister Gauge (D) Resistance wire strain Gauge

71. The Cut-in voltage of a silicon diode is(A) 0.1 volt (B) 0.2 volt(C) 0.3 volt (D) 0.6 volt

72. The BJT works in active region when its p-n junctions (E-B & C-D) are biased(A) as Forward-Forward respectively (B) as Reverse-Reverse respectively(C) as Reverse-Forward respectively (D) as Forward-Reverse respectively

73. One of the following type numbers is not an Op-amp :(A) LM 748 (B) LM 709(C) MC 1458 (D) LM 319

74. One of the following Op-Amp type nos. is a comparator(A) LM 710 (B) LM 741(C) LM 748 (D) LM 747

75. The SLEW RATE specification of an Op-Amp is usually measured in(A) µ Volt/sec (B) Volt/µ sec(C) dB (D) Volt/µ Volt


ROUGH WORK

M.Tech. (Instrumentation)/209101 8 80

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M.Tech. Instrumentation paper/PU