DRDO SET- Pattern and Sample Paper
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DRDO Question Pattern

DRDO Scientist Entry Test(SET) is a 3 hour test.
It consists of
100 Technical Questions
25 Genral Knowledge Questions
25 Aptitude.

Technical Questions
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The technical questionnaire will be covering the entire engineering syllabus,whatever the stream you have applied for.It may contain questions from basic subjects to the advanced level.
So better use GATE coaching tests for the preparation.
Electronics and Communication paper usually have the following specialized subjects
Radar and Television
Satellite communication,
Electro magnetic and Antenna theory,
Digital communication and filter design
Microprocessors.
The questions from basic subjects like analog and digital electronics,networks will be usually easy but sometimes a little twisted.

Aptitude
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The aptitude questions will be covering the usual topics like
Ratio & Proportion
Time and distance.
Time and work
Progression based questions.
Simple geometry.
Logarithms.
Standard aptitude text books like Agarwaal is recommended.

General knowledge.
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A sample GK paper is posted recently in this site.Current affairs and general questions on history,geography,science etc are asked.
Magazines like Competition Success Review,Year Books and GK related websites can be used.


Sample Questions of DRDO SET for E&C stream
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1.The ethernet protocol uses
a. CSMA/CA
b.SCPC
c.CSMA/CD
d.Slotted ALOHA

2.A 1 kHz carrier is Amplitude Modulated to a depth of 60%.the total power of the modulated carrier is
a.1kW
b.1.06kW
c.1.6kW
d.1.18kW

3.A micro controller differs from microprocessor in terms of
a.I/O interfaces and memory configuration.
b.Data bus width and clock speed
c.memory configuration and instruction decoding.
d.I/O interfaces and instruction decoding.

4.An inductance of 1H is realised using air core with 100 turns.What will be the inductance if the number of turns are doubled?
a.1H
b.0.5H
c.2H
d.None of the above.

5.The divergence of magnetic flux density is

6.A straight line and a circle of radius r are given.a chord is drawn at random to this circle parallel to the given line.expected lenght of the chord ois
a. 2a
b.∏a
c.∏a/2
d.none

7.An inductor of inductance 0.1H,carrying a current of 6A will store energy of
a.6 J
b.36J
c.1.8J
d.3.6 J

8.When signal frequency is 2000KHz and IF is 455 KHz,the image frequency is
a.2910KHz
b.1645KHz
c.2455KHz
d.2090KHz

9.A source produces 4 symbols with a probability of 1/2,1/4,1/8,1/8.The avg. code word length is 2 bits/symbol.The efficiency of the code is
a.1
b.7/8
c.1/2
d.1/4

10.A man with n keys wants to open a lock.He tries his keys at random.The expected no. of attempts for his success is
a.n
b.n/2
c.n^1/2
d.none

11.In Radar equation,how the range depends upon frequency of the signal used.

12.The purpose of Cassegrain feed in parabolic reflector antenna is to
a.Acheive higher antenna gain
b.Reduce antenna size
c.Reduce beam-width
d.Ease of locating feed.

13.The advantage of ∏/4QPSK compared to conventional QPSKis

14.Unattenuated radiation field at the surface of the earth of a quarter-wave monopole will exist if the earth surface is
a.Lossy dielectric
b.Perfect insulator
c.Perfect conductor
d.None

15.What is the approximate skin depth in copper at 100MHz.
a.0.1 micron
b.10 micron
c.10mm
d.100 mm