2011 ONGC Placement Paper:

1. Modulation index increased from 0 to 1 . Transmitted power now ?

2. Deemphasis is used because

3. In FM, maximum deviation at what point of modulating signal

4. Voltage gain of emitter follower : <=1 , =1 , >=1 , cannot say

5. CRO uses which method of focussing

6. Slew Rate unit

7. Positive Feedback is same as : degeneration , regeneration

8. Integrator is : LPF , HPF

9. Lowest Efficiency in Power amplifier : A , B , AB , C

10. When PLL is used as frequency multiplier, O/P is taken from

11. Ideal OP Amp Input Impedance = ? Output Impedance = ? , Voltage Gain = ?

12. IC 555 uses how many Flip Flop combination

13. PF of inductive circuit : 0 , 1

14. Unit of magnetic flux

15. 2 heater 1000W, 250V connected in series in 250V , 50Hz ac mains. Power drawn =?

16. 100 batteries , 9V each in parallel combination, Voltage across combination ?

17. HTTP = stateful/stateless protocol ?

18. IP address starts with binary address 110 it is class : A , B , C , D

19. Layer responsible for delivery of packet from node to node

20. ADSL behaviour : upload and download which is more or less ?

21. Damping factor = 1 : underdamped , critically damped , overdamped

22. Difference between controlled variable and desired value of process control system

23. Why differentiator is not part of control system : Increases input noise , increases error , reduces gain, reduces damping

24. Definitiuon of Transfer Fn

25. Identical Telephone no. under different exchanges are distinguished by : Modulation indices , language digit , access digit , area code

26. Which is analog : DCM , DM , DPCM , PWM

27. Carrier synchronization not needed in : BPSK , DPSK , QPSK , QAM

28. Common ckt in Freq Hopp Spread Spectrum and Direct Seq Spread Spectrum : correlator , Freq Synthesizer , Sweep Generator , Pseudo Random Noise Code Generator

29. Bit Rate _ Baud Rate ? : > , < , =

30. Minimum Bwto transmit 56 kbps with no noise ?

31. Asynchronous data transfer : start stop as mark and space

32. f = 10 kHz sampled at Nyquist rate time int B/W 2 success samples ?

33. Find correct parity as odd parity : Rightmost bit as parity bit : 1111111 1 , 0011010 1 , 1100110 1 , 0000000 0

34. Dynamic memory cell store data in : register , capacitor

35. +0.5 V in TTL logic is : high , low , undefined , high impedance

36. Convert BCD 0001 0111 to binary

37. Resolution of 6 bit DAC

38. 5th clock of johnson counter gives o/p = 0111 , 6th clock gives o/p = ?

39. Lissajous figure are eant for measuring : R , V , I , f

40. Unit of Voltage Sensitivity : Ohm/V , V/Ohm , Ohm V , V

41. Volts / div on CRO changes : gain in vertical / sec , : gain in horizontal / sec , freq of timebase , freq of trigger

42. Measurement of Q is based on principle of : Resonance , Mutual Inductance , Piezoelectric Effect , Peltier Effect

43. Laser light is brighter because : Pure , Coherent , White , Monochromatic

44. Contents of Instruction Poointer Specify

45. Waveguide has cut of freq = 17KHz . Which freq will not pass by waveguide : 15 Khz, 22 Khz

46. 1 nepar = _ db

47. Transmission length < (lambda/4) in short ckt behaves as

48. Holding ckt in SCR

49. Centre tapped transformer in single phase cycloconeuses : 2 , 4 , 6 , 8 SCR

50. Maximum height of satellite : Apogee , Perigee

51. Satellite stays in orbit because : Satellite wt. + speed , gravitational pull + inertia , centripetal force +speed , satellite wt +pull of sun and moon

52. FET depends on controlling current through SC change : 1 polarity , 2 polarity , 4 , 8 polarity

53. Beta : Current gain in CC Mode , Current gain in CE Mode, Voltage gain in CC Mode, , Voltage gain in CE Mode

54. Flash Analog To Digital of each comparator is connected to : decoder , priority encoder , MUX , Demux

55. To serially shift a nibble of data in shift register there must be clock pulses : 2 , 4 , 8 , 1 clock pulse for each data

56. Mod 10 counter uses Flip flop : 10 , 4 , 2 , 8

57. Which family IC have better noise immunity : TTL , ECL , CMOS , DTL

58. Address required for 4096 bit memory arranged in 512 X 8 memory

59. When 8 bits serial in / out shift reg. I sused for 20 (mew)sec time delay. Find clock frequency

60. Conversion time of 6 bit successive approximation type ADC : 32 , 64 , 6 , 1/6 usec

61. Wein Bridge is used to measure : f , L , R , C

62. Fibre optic cable best for high speed data transfer : single mode step index , multiple mode step index , single mode graded index , multiple mode graded index

63. Microcontroller includes : CPU + Memory + I/O + Clock Generator , CPU + Memory + I/O , CPU + I/O

64. Fetch cycle is : 1st part of instruction cycle ,

65. Flag to manipulate movement of string : parity , zero , direction , inter

66. Microwave signal propagates by way of : direct , surface , sky , standing wave

67. Makes equivalent current generator in circuit analysis : Norton , Thevenin , Maxm. Power Transfer , Superposition

68. When HPF and LPF section are connected in // it as Band reject filter with : fl > fh , fl = fh , fl < fh



69. When peak transmitted power of a radar is increased by a factor of 16 , maxm range increases by a factor : 2 , 4, 8, 16

70. Tunnel diode : is a point contact diode with high reverse resistance, is highly doped pn junction diode

71. Arrow head of transistor symbol indicates : (drift / diffusion of electron/hole)

72. TRAPATT

73. Currently nearly equal : Ic Ie , Ib Ie , Ic Ib , Ib Ic Ie

74. Aspect ratio : raster width + height , Horizontal scanning frequency + Vertical Scanning frequency.