Here I am providing question papers of Graduate Trainee Exam of ONGC in ECE discipline, so here I am providing following question paper:

ONGC Graduate Trainee ECE Discipline Question Paper

1 . Two coils in differential connection have self-inductance of 2 mH and 4 mH and a mutual inductance of 0.15 mH. The equivalent inductance of the combination is
A. 5.7 mH
B. 5.85 mH
C. 6 mH
D. 6.15 mH.

2. Two point charges Q and -Q are located on two opposite corners of a square as shown in figure. If the potential at the corner A is taken as 1V, then the potential at B, the centre of the square will be
1. zero
2.
3. 1V
4.
3. Optocouplers combine
A. SITs and BJTs
B. IGBTs and MOSFETS
C. Power transformers and silicon transistor
D. Infrared light-emitting diode and a silicon phototransistor

4. The difference between the indicated value and the true value of a quantity is known as
A. Gross error
B. Absolute error
C. Dynamic error
D. Relative error

5. The principles of homogeneity and super-position are applied to :
A. linear time variant sy stems
B. non-linear time variant sy stems
C. linear time invariant sy stems
D. non-linear time invariant sy stems.

6. In a 8085 microprocessor sy stem with memory mapped I / 0,
A. I / 0 devices have 8-bit addresses
B. I / 0 devices are accessed using IN and OUT instructions
C. there can be a maximum of 256 input devices and 256 output devices.
D. arithmetic and logic operations can be directly performed with the I / 0 data.

7 . The transistor shown in figure below, is biased
1. at cut-off
2. at saturation
3. well into saturation
4. well into cut-off
8. In any transmitting antenna sy stem, efficiency primarily depends upon
A. ohmic losses of various conductors
B. radiation resistance
C. ground conductivity
D. atmospheric conditions.

9. An instruction used to set the carry Flag in a computer can be classified as
A. data transfer
B. arithmetic
C. logical
D. program control

10. The binary representation of 5.37 5 is
A. 1 1 1 .101 1
B. 101 .1 101
C. 101 .01 1
D. 1 1 1 .001
1 1 . Dislocations in materials are
A. point defect
B. line defect
C. planer defect
D. surface defects.

12. In TV sy stem, vertical pulses are separated out from horizontal pulses by the use of
A. integrator
B. differentiator
C. sweep credit
D. sync separator.
13. Frequency in the UHF range propagate by means of
A. Ground waves
B. Sky waves
C. Surface waves
D. Space waves.

14. 200 MHz may be classified as
A. VHF
B. SHF
C. UHF
D. EHF
15. A communication satellite is a repeater between
A. a transmitting station and a receiving station
B. a transmitting station and many receiving stations
C. many transmitting stations and many receiving stations
D. none of the above

16. The power in a series R-L-C circuit will be half of that at resonance when the magnitude of the current is
equal to
A. V / 2R
B. V /
C. V /
D

17 . A point charge Q is located on the surface of a sphere of radius R as shown in the figure. The average
electric field on the surface of the sphere will be
1. infinite
2.
3.
4. Zero

18. The efficiency of a chopper can be expected in the range
A. 50 to 55 percent
B. 65 to 7 2 percent
C. 82 to 87 percent
D. 92 to 99 percent

19. Which one out of the following instruments should be used to measure 600 kV a.c. voltages?
A. Hot wire instrument
B. Electrostatic voltmeter
C. Moving coil voltmeter
D. Moving iron voltmeter



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