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DRDO exam Electronics and Communication Engineering question paper

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.

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

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

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

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

The binary representation of 5.375 is
A. 111.1011
B. 101.1101
C. 101.011
D. 111.001

Dislocations in materials are
A. point defect
B. line defect
C. planer defect
D. surface defects.

In TV system, vertical pulses are separated out from horizontal pulses by the use of
A. integrator
B. differentiator
C. sweep credit
D. sync separator

Frequency in the UHF range propagate by means of
A. Ground waves
B. Sky waves
C. Surface waves
D. Space waves.

200 MHz may be classified as
A. VHF
B. SHF
C. UHF
D. EHF

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

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.

The efficiency of a chopper can be expected in the range
A. 50 to 55 percent
B. 65 to 72 percent
C. 82 to 87 percent
D. 92 to 99 percent

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.

DRDO exam Electronics and Communication Engineering question paper
21. The following programme is run on an 8085 microprocessor,



Memory address in Hex Instruction



2000 LXI SP, 1000



2003 PUSH H



2004 PUSH D



2005 CALL 2050



2008 POP 2050



2009 HIT

As the completion of execution of the program, the program the program counter of the 8085 contains ………, and the stack pointer contains ……..

2050, OFFC
2251, OFFC
1025, OCCF
1025, OCCF

22. With reference to figure, value of VCE is


0 V
5 V
-5V
none of the above

23. The smallest change in sound intensity that can be detected



A. 1 dB



B. 3 dB



C. 10 dB



D. 20 dB.

24. In a generic microprocessor, instruction cycle time is



A. shorter than machine cycle time



B. larger than machine cycle time



C. exactly double the machine cycle time



D. exactly the same as the machine cycle time

25. The value of M in the end will be



Do 100 I = 1, 2



DO 200 J = 1, 2



M = M + I + J



200 CONTINUE



100 CONTINUE



STOP



END

10
11
12
14

26. Resistivity of electrical conductors is most affected by



A. temperature



B. pressure



C. composition



D. all of the above

27. In CCIR B-system of TV, blanking pulse is placed during



A. equalizing pulse



B. retrace interval between each line



C. retrace period of vertical line



D. none of the above

28. The polarization required in ground wave propagation is



A. Horizontal (linear)



B. vertical (linear)



C. Circular



D. Elliptical

29. Multicavity Klystron



A. is not a microwave device



B. is not a good low level amplifier because of noise



C. is not suitable to pulse operation



D. has a high repeller voltage to insure small transit time

30. Transponder comprises of



A. Transmitter



B. Receiver



C. Antenna



D. a, b, c combined

31. Consider the following statements regarding the circuit shown in the given figure :


1. If the switch K is closed at a proper instant there will be no transient

2. The instant at which K is closed such that the transient is zero depends on the frequency of the supply

3. The instant at which K is closed such that the transient is zero depends on the circuit elements

4. There will always be a non-zero transient after the switch K is colosed.

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