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April 1st, 2017, 01:11 PM
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Re: DRDO Sample Paper For Electronics

As you are looking for DRDO Sample Paper For Electronics subject so on your demand I am providing same for you :

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


zero

1V

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 systems
B. non-linear time variant systems
C. linear time invariant systems
D. non-linear time invariant systems
6. In a 8085 microprocessor system 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


at cut-off
at saturation
well into saturation
well into cut-off
8. In any transmitting antenna system, 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 5.375 is
A. 111.1011
B. 101.1101
C. 101.011
D. 111.001
11. Dislocations in materials are
A. point defect
B. line defect
C. planer defect
D. surface defects.
12. 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
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


infinite


Zero
18. 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
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.

20.

Which one of the following transfer functions represents the Bode plot shown in the above figure:




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


A. 0 V
B. 5 V
C. -5V
D. 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
A. 10
B. 11
C. 12
D. 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.

Of these statements
A. 1 alone is correct.
B. 1 and 2 are correct.
C. 1 and 3 are correct
D. 4 alone are correct.
32. A circular ring carrying a uniformly distributed charge Q and a point charges -Q on the axis of the ring are shown in the fig. The magnitude of the dipole moment of the charge system is

A. Qd
B. Q R2 / d
C. Q
D. QR.
33. Which of the following regulator provides output voltage polarity reversal without a transformer?
A. Buck regulator
B. Boost regulator
C. Buck-boost regulator
D. Cuk regulator
34. The deflection of hot wire instrument depends on
A. RMS value of alternating current
B. voltage
C. average value of a.c. current
D. instantaneous value of a.c. current
35. Match List-I with List-II and select the correct answer using the codes given below the Lists:
List-I List-II
(Response to a unit step input) (Location of poles in the s-plane)
A. 1.One at the origin
B. 2.Two identical roots on the negative real axis
C. 3.Two on the imaginary axis
D. 4.One on the position real axis
Codes:
A B C D
A. 4 3 2 1
B. 3 4 1 2
C. 3 4 2 1
D. 4 3 2 1
36. Dual slope integration type Analog-to-Digital converters provide
A. higher speeds compared to all other types of A / D converters
B. very good accuracy without putting extreme requirements on component stability
C. poor rejection of power supply hums
D. better resolution compared to all other types of A / D converters for the same number
Of bits
37. In the figure given below, the collector current is

A. 2 mA
B. 200 mA
C. Almost zero
D. 0.02 mA
38. The frequency modulated (FM) radio frequency range is nearly
A. 250 - 300 MHz
B. 150 - 200 MHz
C. 90 - 105 MHz
D. 30 - 70 MHz
39. A 32 bit microprocessor has the word length equal to
A. 2 bytes
B. 1 byte
C. 4 bytes
D. 8 bytes
40. In electronic microcircuits, a resistor may be fabricated from constant-thickness layer of semiconductor material with conductor connections at the edges as shown below. If the resistor shown has resistance R, then a similar resistor 0.2 millimeter has a resistance of

A. 4 R
B. 2 R
C. R
D. R / 2
41. Line imperfection in a crystal is called
A. Schottky defect
B. Frenkel defect
C. edge dislocation
D. Miller defect.
42. The function of Diplexer Bridge in a TV transmitter is
A. to prevent the loading of several transmitters by video transmitter
B. to increase the bandwidth
C. to increase the power output
D. to increase the efficiency of transmission
43. Sometimes microwave signals follow the earth’s curvature. This due to
A. Ionospheric reflection
B. Faraday rotation
C. Ducting
D. Ionospheric scatter.
44. The modes in a reflex Klystron
A. gives the same frequency but different transit time
B. result from excessive transit time across the resonator gap
C. are caused by spurious frequency modulation
D. are just for theoretical considerations.
45. The capacity of a channel is
A. number of digits used in coding
B. volume of information it can take
C. maximum rate of information transmission
D. bandwidth required for information
46. Semiconductor A has a higher band gap than semiconductor B. If both A and B have the same dimensions, the same number of electrons at a given temperature and the same electron and hole mobilities, then
A. A has the same number of holes as B
B. A has a larger number of holes than B
C. A has less number of holes than B
D. any of the above statements (a), (b) or (c) could be true
47. Indicate which of the following signals is not transmitted in colour TV
A. Y
B. Q
C. R
D. I
48. In one of the following radars, the transmitted beam is steered in angle electronically
A. Monopulse Radar
B. Pulse compressor Radar
C. Phased Array Radar
D. Moving Target Indicator.
49. Baretters and bolo meters are used for measurement of
A. VSWR
B. transmission losses
C. microwave power
D. none of these
50. DC energy required for satellites is generally derived from
A. Solar cells and nickel-cadmium cells
B. Solar cells only
C. Regulated d.c. poser supplies
D. Some special batteries.
Attached Files
File Type: pdf DRDO Sample Paper For Electronics.pdf (430.7 KB, 61 views)


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