Interview Questions With Answers: DRDO Paper

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Tuesday, 8 July 2008

DRDO Exam Conducted in Sept 2003 Paper - 10

General Pattern

-There are 2 sections:A and B
-,A, section consists of technical questions relevant to your field[100 questions]
-,B, section consists of a mix of Analytical,Quantitative and General Knowledge questions[50 questions]
4 marks for correct answers and -1 for wrong answers

Section ,A, questions

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...

Section ,B, questions

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

DRDO SAMPLE INTERVIEW QUESTIONS Paper - 8

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 affects 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?

DRDO Placement Paper Paper - 9

Direct Theory question:

1. A triangular-square wave generator uses
* A sine wave oscillator and a comparator
* An integrator and a comparator
* A diffrentiator and comparator
* A sine wave oscillator and a clipper
2. An amplifier has two identical cascaded stages. Each stage has a BW of 20KHz. The overall BW
shall be
* 10KHz
* 12.9KHz
* 20KHz
* 28.3HHz
Direct numerical problem:

1. A parabolic dish antenna has a diameter of 1m. the maximum possible ideal gain of the antenna at a wavelength 3.14cm is
* 20 dB
* 30 dB
* 40 dB
* 50 dB
2. The frequency deviation produced in a VHF carrier by a signal of 100Hz is 50KHz. The frequency modulation is
100 radians
250 radians
500 radians
750 radians

Application based theoretical or numerical problem:

Which one of the pulses has the same form in time domain as well as in frequency domain
Rectangular
Exponenetial
Triangular
Gaussian
Good voice reproduction via PCM requires 128 quantisation levels. If the BW of voice channel is 4KHz then data rate is
256 Kbps
128 Kbps
56 Kbps
28 Kbps
Match the following:
1. List 1 List2
A. Thyristor 1. Second break down
B. MOSFET 2. Large on-state drop
C. IGBT 3. Small on state drop
D. BJT 4. Slow device
Codes:
(a) A-4, B-3, C-2, D-1 (b) A-1, B-2, C-3, D-4
(c) A-4, B-2, C-3, D-1 (d) A-1, B-3, C-2, D-4
List 1 List2

A. Free and forced response 1. Discrete time systems
B. Z transform 2. Dirichlet conditions
C. Probability theory 3. Non-homogenous differential equation
d. Fourier series 4. Random process

Codes:

(a) A-1, B-3, C-2, D-4 (b) A-3, B-1, C-2, D-4
(c) A-1, B-3, C-4, D-2 (d) A-3, B-1, C-4, D-2

Assertion and reasoning type:

The following item consists of two statements labeled as Assertion A and the other as Reason R. Use the following codes:
(a) Both A&R are individually true and R is the correct explanation of A
(b) Both A & R are individually true and R is not the correct explanation of A
(c) A is true and R is false
(d) A is false and R is true
AEvery materials has a different value of energy band gap except metals which have no band gap
R The energy band gap is decided by the equilibrium lattice constant, which is different in different materials.
AOp-amp are commonly used in instrumentation
R Op-amps do not load the circuit due to their very high input impedance

Problem based on circuits and graphs:

Some examples:
For circuits: HW rectifier, voltmeter, RC or RLC or RL transients, feedback systems, clipper, clamper, transistor biasing,555 circits, logic gates, counters, bridges and wattmeters.
Graphs: Frequency response H(s),open loop gain from root loci, Nyquist plot, transfer functions etc

DRDO Aptitude - General Paper - 5

This piece of info in obtained from the DRDO SET exam conducted in Sept 2003. Still the questions is not yet complete.

General Pattern

-There are 2 sections:A and B
-,A, section consists of technical questions relevant to your field[100 questions]
-,B, section consists of a mix of Analytical,Quantitative and General Knowledge questions[50 questions]
4 marks for correct answers and -1 for wrong answers

Section ,A, questions

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...

Section ,B, questions

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

DSL Paper Aptitude - General Paper - 6

. What is the percentage represented by 0.03 * 0.05 ?
(a)0.0015
(b)0.000015
(c)0.15
(d)15
Ans.B

2. (x-a)(x-b)(x-c)....(x-z) = ?
(a) 1
(b) -1
(c) 0
(d) Can,t be determined
Ans. C

3. If a = 1, b = 2, c = 3.......z = 26 what is the value of p+q+r ?
(a)33
(b)51
(c)52
(d)48
Ans. B

4. A is 8 miles east of B.
C is 10 miles north of B.
D is 13 miles east of C and E is 2 miles north of D.
Find shortest distance between A and E.
(a) 5 miles
(b) 6miles
(c) 13 miles
(d) 18 miles
Ans. C

5. If z = 1, y = 2.......a = 26. Find the value of z + y + x + .......+a.
(a) 351
(b) 221
(c) 400
(d) 200
Ans. A

6. There are 30 socks in a bag. Out of these 60 % are green and the rest are blue. What is the maximum number of times that socks have to be taken out so that atleast 1 blue pair is found.
(a) 21
(b) 2
(c)18
(d) 20
Ans. D

7. How many two digit numbers have their square ending with 8.
(a) 13
(b) 12
(c) 0
(d) 11
Ans. C

8. How many numbers are there between 100 and 300 with 2 in the end and 2 in the beginning.
(a) 10
(b) 9
(c) 11
(d) none of these
Ans. A

9. 0.000006 * 0.0000007 = ?
(a) 0.0000000042
(b) 0.000000000042
(c) 0.0000000000042
(d) 0.00000000000042
Ans. B

10. You have Rs 1000 with 8% p.a compounded every 6 months. What is the total interest you get after 1 year.
(a) Rs.116.40
(b) Rs.345.60
(c) Rs.224.50
(d) Rs.160
Ans. A

11. If x + y =12,
x - y = 2
Find x + 2y.
(a) 12
(b) 17
(c) 14
(d) none of these
Ans. B

12. With one gallon of petrol a person moves at a speed of 50 mph and covers 16 miles. 3/4th of the distance is covered while moving at 60 mph. How many gallons does he need to cover 120 miles in 60 mph.

13. A tap drains at x speed while tap B is closed. When both taps are open they drain at y speed. What is the speed of draining when only tap B is open
(a) x - y
(b) y-x
(c) x
(d) can,t be determined
Ans. B

14. What is twenty percent of 25 % of 20.
(a) 2
(b)1
(c) 5
(d) 4
Ans. B

15. A rectangle has the dimensions 6ft * 4ft. How many squares of 0.5 inches will it need to completely fill it.

(a) 32000
(b) 12824
(c) 13824
(d) 18324
Ans. C

Directions for questions 16-21: In each question,a series of letters satisfying a certain pattern are given. Identify the pattern and then find the letter/letters that will come in place of the blank/blanks.
16. a, c, e, g, _
(a) h
(b) i
(c) d
(d) j
Ans. B

17. a, e, i, m, q, u, _, _
(a) y, c
(b) b, f
(c) g, i
(d) none
Ans. A

18. ay , bz , cw , dx ,__
(a) gu
(b) ev
(c) fv
(d) eu
Ans. D

19. 1, 2, 3, 5, 7, 11, __
(a) 15
(b) 9
(c) 13
(d) 12
Ans. 13 , series of prime numbers

20. kp , lo , mn , __
(a) nm
(b) np
(c) op
(d) pq
Ans. A

21. abc , zyx , def , wvu , ___
(a) ghi
(b) tsr
(c) ihg
(d) str
Ans. A

22. How is my mother,s sister,s brother,s wife,s child related to me?
(a) brother
(b) uncle
(c) cousin
(d) nephew
Ans. A

23.What will my mother,s husband,s father-in-law,s son,s daughter to me?
(a) niece
(b) aunt
(c) sister
(d) none of these
Ans. D

24. A person travels 12 km in the southward direction and then travels 5 km to the right. He then travels 5 km to the right and then travels 15 km towards the right and finally travels 5km towards the east. How far is he from his starting place?
(a) 5km
(b) 3m
(c) 3.5km
(d) 4km
Ans. (b)

25. A person travels towards east from his house and travels a distance of 3 meters. He then ran a distance of 7 meters southwards and then travels towards east a distance of 3 meter Finally he travels southwards a distance of 10 meters.What is his vertical distance from his house?
(a) 10
(b) 17
(c) 12
(d) none of these
Ans. B

26. The sum of three consecutive numbers is 132. Find the square of the largest number.
(a) 2026
(b) 640
(c) 900
(d) 2025
Ans. D

27. Father,s age is five times his son,s age. Four years back father was 9 times older than his son.Find their present ages
(a) 30yrs, 6yrs
(b) 25yrs, 5yrs
(c) 40yrs, 8yrs
(d) none of these
Ans. C

28. If x + 5y = 6 ;
7x - 2y = 5
Find x - y
(a) 1
(b) 2
(c) 0
(d) none of these
Ans. C

29. If the equation x2 + 2(k+2)x + 9k = 0 has equal roots, find k?
(a) 1,4
(b) 1,5
(c) 2,5
(d) can,t be determined
Ans. A
Directions for questions 30 to 35: Select the alternative that logically follows form the two given statements.

30. All books are pages. All pages are boxes.
(a) All boxes are books
(b) All books are boxes
(c) No books are boxes
(d) Both (a) and (b) are correct
Ans. B

31. No apple is an orange. All bananas are oranges.
(a) All apples are oranges
(b) Some apples are oranges
(c) No apple is a banana
(d) None of the above
Ans. A

32. All pens are elephants. Some elephants are cats.
(a) Some pens are cats
(b) No pens are cats
(c) All pens are cats
(d) None of the above
Ans. D

33. All shares are debentures.No debentures are deposits.
(a) All shares are deposits
(b) Some shares are deposits
(c) No shares are deposits
(d) None of the above
Ans.C

34. Many fathers are brothers. All brothers are priests.
(a) No father is a priest
(b) Many fathers are not priests
(c) Many fathers are priests
(d) Both (b) and (c)
Ans. B

35. Some pens are pencils. All pencils are costly.
(a) No pens are costly
(b) Some pens are costly
(c) All pens are costly
(d) None of the above
Ans. B

36. How many two digit numbers have their squares ending with 6?
(a) 9
(b) 10
(c) 164
(d) 18
Ans. D

37. In how many years will $1200 amount to $1323 at 5%p.a. compound interest?
(a) 3 years
(b) 2 1/2 yrs
(c) 2 yrs
(d) none of the above
Ans. C

38. How many terms of the series -9 , -6 , -3 ,.........must be taken such that the sum may be 66?
(a) 11
(b) 13
(c) 9
(d) 10
Ans. A

39. The sum of three numbers in AP is 27 and their product is 504. Find the terms.
(a) 7, 9 ,11
(b) 5, 9, 13
(c) 4, 9, 14
(d) none of these
Ans. C

40. Two pipes A and B can fill a tank in 20 and 25 seconds respectively. Both are opened at the same time and after 5 minutes the first one is closed.How much more time will it take for the tank to be full?
(a) 13 min 45 secs
(b) 10 min
(c) 18 min
(d) 15 min 45 secs
Ans. A

41. How long will a train 150 metres long and travelling at a speed of 45 kmph, take to cross a platform of length 250 meters?
(a) 48 secs
(b) 32 secs
(c) 30 secs
(d) none of the above
Ans. B

42.Walking at 4/5th of his usual speed, a man reaches his office 15 mins late. Find his usual time for reaching the office?
(a) 45 mins
(b) 2 hrs
(c) 1 hr
(d) 30 mins
Ans. C

43. If the word "CODING" is represented as DPEJOH , then the word "CURFEW" can be represented?
(a) DVSGFX
(b) DVSHFX
(c) DGSHFX
(d) DTSGFY
Ans. A

44. If in a certain code "RANGE" is coded as 12345 and "RANDOM" is coded as 123678, then the code for the word "MANGO" would be
(a) 82357
(b) 84563
(c) 82346
(d) 82543
Ans. D

45. If in a code "COPIER" is coded as 1234 and "REAM" is coded as 5421,then "DREAM" is coded as
(a) 35421
(b) 43512
(c) 35412
(d) 34521
Ans. A

Directions for questions 46-48:The questions are based on the following data In a class of 150 students 55 speak English;85 speak Telugu and 30 speak neither English nor Telugu
46. How many speak both English and Telugu?
(a) 10
(b) 15
(c) 20
(d) 12
Ans. C

47.How many speak only Telugu?
(a) 55
(b) 45
(c) 65
(d) none of the above
Ans.C

48.How many speak at least one of the two languages?
(a) 120
(b) 100
(c) 250
(d) 50
Ans. A

49. Find the lowest of the three numbers in a GP whose sum is 38 and product 945.
(a) 12
(b) 18
(c) 4
(d) 8
Ans. D

50. A can do a piece of work in 24days. When he had worked for 4 days B joined him. If the complete work is finished in 16 days form the beginning, in how many days can B alone finish the work?
(a) 24 days
(b) 18 days
(c) 36 days
(d) None of the above
Ans. C

DRDO Sample Questions Paper - 7

It contained 2 parts PART 1 - pure technical 100 ques. and Part 2 50 Ques.
Part 1 was purely technical but I was hard 2 answer part 2 general Knowledge abt 20-25ques were from maths remaining from general.They collected the question paper back. Iam herewith attaching some of the questions that noted down at hall.

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]
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?
The New Biotechnology Software intorduced by TCS is? What is Wi Fi?
Which is the fastest Cruise Missile?

DRDO Aptitude - General 3 Paper - 3

DRDO Sample Questions

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]
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?
The New Biotechnology Software intorduced by TCS is? What is Wi Fi?
Which is the fastest Cruise Missile?

DRDO Aptitude - General 1 Paper - 4

Model for ECE:
Direct Theory question:
1. A triangular-square wave generator uses
* A sine wave oscillator and a comparator
* An integrator and a comparator
* A diffrentiator and comparator
* A sine wave oscillator and a clipper
2. An amplifier has two identical cascaded stages. Each stage has a BW of 20KHz. The overall BW
shall be
* 10KHz
* 12.9KHz
* 20KHz
* 28.3HHz
Direct numerical problem:

1. A parabolic dish antenna has a diameter of 1m. the maximum possible ideal gain of the antenna at a wavelength 3.14cm is
* 20 dB
* 30 dB
* 40 dB
* 50 dB
2. The frequency deviation produced in a VHF carrier by a signal of 100Hz is 50KHz. The frequency modulation is
100 radians
250 radians
500 radians
750 radians

Application based theoretical or numerical problem:

Which one of the pulses has the same form in time domain as well as in frequency domain
Rectangular
Exponenetial
Triangular
Gaussian
Good voice reproduction via PCM requires 128 quantisation levels. If the BW of voice channel is 4KHz then data rate is
256 Kbps
128 Kbps
56 Kbps
28 Kbps
Match the following:
1. List 1 List2
A. Thyristor 1. Second break down
B. MOSFET 2. Large on-state drop
C. IGBT 3. Small on state drop
D. BJT 4. Slow device
Codes:
(a) A-4, B-3, C-2, D-1 (b) A-1, B-2, C-3, D-4
(c) A-4, B-2, C-3, D-1 (d) A-1, B-3, C-2, D-4
List 1 List2

A. Free and forced response 1. Discrete time systems
B. Z transform 2. Dirichlet conditions
C. Probability theory 3. Non-homogenous differential equation
d. Fourier series 4. Random process

Codes:

(a) A-1, B-3, C-2, D-4 (b) A-3, B-1, C-2, D-4
(c) A-1, B-3, C-4, D-2 (d) A-3, B-1, C-4, D-2

Assertion and reasoning type:

The following item consists of two statements labeled as Assertion A and the other as Reason R. Use the following codes:
(a) Both A&R are individually true and R is the correct explanation of A
(b) Both A & R are individually true and R is not the correct explanation of A
(c) A is true and R is false
(d) A is false and R is true
AEvery materials has a different value of energy band gap except metals which have no band gap
R The energy band gap is decided by the equilibrium lattice constant, which is different in different materials.
AOp-amp are commonly used in instrumentation
R Op-amps do not load the circuit due to their very high input impedance

Problem based on circuits and graphs:

Some examples:
For circuits: HW rectifier, voltmeter, RC or RLC or RL transients, feedback systems, clipper, clamper, transistor biasing,555 circits, logic gates, counters, bridges and wattmeters.
Graphs: Frequency response H(s),open loop gain from root loci, Nyquist plot, transfer functions etc

DRDO Whole Testpaper Paper - 1

DRDO PAPER ON 4th NOVEMBER 2007

Hi Many questions will be asked about your B.Tech Project

Device density on a processor/chip
Difference between computer and super computer
How the performance of a super computer is measured (in tera flops)
what is tera flop ?
If a 2.8GHz processor is given, calculate the number of floating point calculations that it can do.
name of indigenous super coputer (PARAM, built by C-DAC)
Did DRDO make any super computer ?

what is multi tasking
Question on Process serialization
Question on Producer consumer problem
Question on Inter Process Communication
Define critical section
Are Metal Oxide Semiconducter devices slower ? Why ?

Truth table of half adder & full adder
Question on Circular Queue
2/3 Questions on Binary search algorithm
Question in C about Strucuter & Union

DRDO General - other Paper - 2

DRDO SAMPLE INTERVIEW QUESTIONS

Interview Questions With Answers

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