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20th November 2014, 12:11 PM
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Join Date: Apr 2013
Re: DRDO Exam Modal Papers

DRDO: DRDO stands for Defence Research & Development Organisation. DRDO conduct entrance exam according to their Recruitment.

Here I am providing modal question of DRDO exam:

1. If 100ns is Memory Access Time & 125 microsec is 1frame period. The no. of line that can be supported in a Time Divison Switch is
a)125 Lines
b)625 Lines
c)525 Lines
d)465 Lines

2. The no. of edjes in disjoint Hamilton circuit in a complex graph with 17 edges is
a) 8
b) 9
c) 136
d) 17^2

3. 15 persons in a club sit every day ina dinner table such that every member has different neighbour. This arrangement will last for how many days.
Assume a system has 16MB cache mean Disk Access Time & cache Access time is 76.5 ns & 1.5 overall mean Access time us 465ms for each tripling the memory the miss rate is halved. The memory required to bring down the mean Access time to 24ns is
a) 16 MB
b) 24 MB
c) 32 MB
d) 48 MB

4.Average transfer speed of a i/p serial line is minimum 25,000 Bytes & maximum 60000 Bytes. Polling Strategy adopted takes 4microsec(whether there is any i/p byte or not). It is assured that byte that retrived from controller before next byte arrives are lost. Then the maximum safe polling interveal is
a) 12
b) 12.33
c) 12.67
d) 32

5. A harddisk has a rotation speed of 4500RPM. then the latency time is
a) .4
b) .6
c) .7
d) .9

6.Suppose all elements above the principal diagonal od n x n matix A are zero. If non zero elements of the lower triangular Matrix is stored in an array B with A[1][1] stored at B[1]. The addressing formula to the nonzero element in A[i][j]=?
a) A[i][j]
b) i(j-1)/2 +i
c) j(i-1)/2 +i
d) i(i-1)/2 +j

7.The minumum number of comparisons requied to find the second smallest element in a 1000 element array is
a) 1008
b) 1010
c) 1999
d) 2000

8.The internal path length of a Bonary Tree with 10nodes is 25. The external path length is
a) 25
b) 35
c) 40
d) 45

9.Average No. of Comparisons required to sort 3 elements is
a) 2
b) 2.33
c) 2.67
d) 3

10.In a switch the mean arrival rate of packets is 800 Packets/sec and the the mean service rate is 925 Packets/sec
a) .008 Sec
b) .08 sec
c) .8 sec
d) 1.1 sec

11. What is Interface Control Information?

12. The minumum no. of Multiplications needed to compute x^768 is
a) 9
b) 10
c) 425
d) 767

13. Find values for a,b,c,d
c 1 1 1
0 a 1 b
_______
1 0 d 0

(967)basex = 321base9

14. The area of red planet where the Mars Rover Landed? In Which Day world Telecom Day Celebrated? Laser is used for what?
a) Treatment of Cancer
b) Treatment of Eyes
c) Treatment of Heart
d) Treatment of Kidney

15.Which country is not a Member of SAARC
a) Bangladesh
b) Myanmar
c) Maldives
d) Nepal
16. The New Biotechnology Software intorduced by TCS is?
What is Wi Fi?
17. Which is the fastest Cruise Missile?


1) Coldest planet:Pluto
2) INS Shivali is the first:
3) Which one of the following was NOT indegineously developed?:Prithvi/Akash/Agni
4) Full form of SARS
5) Anthrax is a :Virus/Bacteria/.../...
6) Dakshina Gangothri is:Ganga's origin/Indian camp @ antartica/.../...
7) Which of the following is a chemical weapon:Mustard Gas/Marsh Gas/.../...
8) A question based on Coding and Decoding
9) Another question similar to above
10) Question on series completion
11) Another series completion question
12) Where is Institute of Forensic Science?:Hyderabad
13) A G.K question based on X and Y chromosomes in males and females
Sample technical questions asked in test last year in CSE :
1) Banker's algorithm is used for: Deadlock Avoidance
2) A LOT of questions were based on generating strings from a given grammar.
3) A circle(dot) shown in the PCB is:Vcc/Grnd/Pin 1/Pin 14
4) Program Segment Prefix in MS-DOS 5.0 is:
5) Some IP addresses were given and the question was to select the private addess from it(?)
6) 10Base2 and 10Base5 wires refers to:
7) A question on sliding-window protocol
8) Which of the following require a driver?:disk/cache/ram/cpu
9) A LOT of mathematical questions which were asked from calculus,trigonometry...
The questions asked in ECE were mainly from Control Systems, Communications
EMT and microprocessor
Make sure that u know the fundas of microprocessors useful in interview also: see if u know these questions
1. Which type of architecture 8085 has?
2. How many memory locations can be addressed by a microprocessor with 14 address lines?
3. 8085 is how many bit microprocessor?
4. Why is data bus bi -directional?
5. What is the function of accumulator?
6. What is flag, bus?
7. What are tri -state devices and why they are essential in a bus oriented system?
8. Why are program counter and stack pointer 16-bit registers?
9. What does it mean by embedded system?
10. What are the different addressing modes in 8085?
11.What is the difference between MOV and MVI?
12. What are the functions of RIM, SIM, IN?
13. What is the immediate addressing mode?
14. What are the different flags in 8085?
15. What happens during DMA transfer?
16. What do you mean by wait state? What is its need?
17. What is PSW?
18. What is ALE? Explain the functions of ALE in 8085.
19. What is a program counter? What is its use?
20. What is an interrupt?
21. Which line will be activated when an output device require attention from CPU?
Then comes the interview questions asked in ECE interview were fundamental.Qustions asked in my interview
were:
Director
1. Which college and university are you coming from?
2. Did you appear for GATE? Why are you not interested in higher studies ?
3. Did you appear for IES?
4. Did you appear for any other board interview of public sector?
5. The subjects you have learned in college can be divided into three- basic electronics, communi -cation and
digital logic. Tell me any five subjects you like.
(I told radar and navigational aids, electronic warfare, satellite communication, biomedical instrumentation,
fuzzy electronics and basic digital electronics as my subjects)
Board member1 (QUESTION LEVEL- MODERATE)
1. Write the truth table for full adder and implement it in NAND gate only.
2. What's the difference between looping 0s and 1s in K map?
3. Difference between microprocessor and micro controller
4. Microprocessors you are familiar with
5. How will you send and receive data to a micro-processor? (One method is I/O mapped I/O which is the other
one?)
6. Radar range equation?
7. Does the radar range depend upon the frequency of the signal transmitted?
8. What is Doppler shift? What is its importance?
BOARD MEMBER -2 QUESTION LEVEL- TOUGH)
1. I will make two fuzzy statements. Pencil is long. Table is long. What is the term long signify?
2. What is a membership function?
3. What are the design criteria for very low frequency amplifier?
4. Can you measure distance with the help of CW radar? If so how?
5. How will you design a stable oscillator? (Not with crystal oscillator because temperature affec ts it)
6. You have designed an amplifier. After few days it is found that its gain have changed. What might be the
reason?
BOARD MEMBER-3 (QUESTION LEVEL- MODERATE)
1. A plane is moving in a circular path around the transmitter of the radar. Will there be Doppler shift detected
in the radar?
2. State Keplers laws
3. Why there is more geo synchronous satellite?
4. The angular difference between two satellites is 2 degree. What is the maximum number of satellites
needed to cover the whole earth?
5. What is the minimum number of satellites needed to cover the whole earth?
BOARD MEMBER-4 QUESTION LEVEL- MODERATE)
1. Which is the law of conservation involved in the second of Keplers?
2. Why do you explain elliptical orbit while stating Kepler's law? Why not circular orbit?
3. What are the advantages of optical communication?
4. What are the invasive and non-invasive methods of instrumentation?
For CS guys they started with this question: What is a key board? Where u will connec? What will happen if you
press the keys?..
For maths guys they asked some questions on series.. I don't know muchSome guys were selected just by
describing the final year project.
1. How can you design a phase detector using a XOR gate?
2. Questions abt differentiator and integrator. What will happen if we increase/decrease the values of R/C?
3. how will a low/high pass filters behave to different signals –ramp, pulse etc
4. questions on flip flops
5. Johnson counter
6. Questions on microprocessors - what is SIM?
7. Abt your project. What will happen when this/that happens to your project?
8. Radar, antenna and satellite communication.
9. Which is the first/latest communication satellite?
10. What is apogee /perigee?

If 100ns is Memory Access Time & 125 microsec is 1frame period. The no. of line that
can be supported in a Time Divison Switch is
a)125 Lines
b)625 Lines
c)525 Lines
d)465 Lines
The no. of edjes in disjoint Hamilton circuit in a complex graph with 17 edges is
a) 8
b) 9
c) 136
d) 17^2
15 persons in a club sit every day ina dinner table such that every member has different
neighbour. This arrangement will last for how many days .
Assume a system has 16MB cache mean Disk Access Time & cache Access time is 76.5
ns & 1.5 overall mean Access time us 465ms for each tripling the memory the miss rate is
halved. The memory required to bring down the mean Access time to 24ns is
a) 16 MB
b) 24 MB
c) 32 MB
d) 48 MB
Average transfer speed of a i/p serial line is minimum 25,000 Bytes & maximum 60000
Bytes. Polling Strategy adopted takes 4microsec(whether there is any i/p byte or not). It is
assured that byte that retrived from controller before next byte arrives are lost. Then the
maximum safe polling interveal is
a) 12
b) 12.33
c) 12.67
d) 32
A harddisk has a rotation speed of 4500RPM. then the latency time is
a) .4
b) .6
c) .7
d) .9
Suppose all elements above the principal diagonal od n x n matix A are zero. If non zero
elements of the lower triangular Matrix is stored in an array B with A[1][1] stored at
B[1]. The addressing formula to the nonzero element in A[i][j]=?
a) A[i][j]
b) i(j-1)/2 +i
c) j(i-1)/2 +i
d) i(i-1)/2 +j
The minumum number of comparisons requied to find the second smallest element in a
1000 element array is
a) 1008
b) 1010
c) 1999
d) 2000
The internal path length of a Bonary Tree with 10nodes is 25. The external path length is
a) 25
b) 35
c) 40
d) 45
Average No. of Comparisons required to sort 3 elements is
a) 2
b) 2.33
c) 2.67
d) 3
In a switch the mean arrival rate of packets is 800 Packets/sec and the the mean service
rate is 925 Packets/sec
a) .008 Sec
b) .08 sec
c) .8 sec
d) 1.1 sec
What is Interface Control Information?
The minumum no. of Multiplications needed to compute x^768 is
a) 9
b) 10
c) 425
d) 767
Find values for a,b,c,d
c 1 1 1
0 a 1 b
1 0 d 0
(967)basex = 321base9
PART II Genreal 50 General Non-Technical[4 Options]
{ >20 questins were from Mathematic}
----------------------------------------
The area of red planet where the Mars Rover Landed?
In Which Day world Telecom Day Celebrated?
Laser is used for what?
a) Treatment of Cancer
b) Treatment of Eyes
c) Treatment of Heart
d) Treatment of Kidney
Which country is not a Member of SAARC
a) Bangladesh
b) Myanmar
c) Maldives
d) Nepal
The New Biotechnology Software intorduced by TCS is?
What is Wi Fi?
Which is the fastest Cruise Missile?



If you want to get more modal question of DRDO exam, download this PDF file:
Attached Files
File Type: pdf Modal Papers of DRDO Exam-.pdf (182.7 KB, 120 views)
File Type: pdf Modal Papers of DRDO Exam.pdf (137.3 KB, 69 views)


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