ONGC Placement Paper Whole Testpaper ahmedabad-19 Jun 2010
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)
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.
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