DRDO Interview Questions And Answers

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Here is the few list of collection of interview question asked by the DRDO interview panel for candidates who have cleared the written exams conducted by DRDO like SET, CEPTAM, JRF and SRF. Find interview question for ECE, CSE, EEE, Mech, Chemical, IT and various other branches.

For DRDO Exam Question Paper - CLICK HERE

Books:
There are various reference books which you can refer and download for the DRDO SETexamination. You can also refer other PSU papers as it will given a idea about question. Please do prepare the subjects of you respective branches this will make your chances of clearing exam more. All the best. Below you can find the list of books which you can refer and the author. Please add your suggestion of books in comment box below.

For books Click Here



DRDO SAMPLE INTERVIEW 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


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?

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 member 1 (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 much. Some 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?



Interview Experience -

Hi, FriendsI have appeared in DRDO interview for Scientist-B at Pune on 17th November 2007.First all candidates have to sit in waiting room at venue center and give sign for presence. It will be better for guys to go with tie and black shoe. Tea or Coffee provided in waiting room and go for documents verification & submission oftheir required Bio-data form one bye one in administrative office according to list of candidates.(They have called 12 candidates on that day).At that time Interview was started in sequence. Average time taken for interview is half hour. Inthe interview room there was five members. One chairman, two internal members and two external members.When you enter inside interview room you have to sit in front of board members.One will first demand for your project report and one ask about your interesting subject of your discipline. Then different board member ask question about your interesting subjects. If you are answering right way then they can take you inbrief to map your abilities. Then member who has taken your project report willask about your project work. I am highlighting questionnaires below which I have faced in interview. I am belongs to CSE so I have told Data Structure, Microprocessor and Computer Networks from my interesting subjects.Board Member-I (Chairman)1) What is your Name?2) Which College you are belongs to?3) Types of network cables?4) Building structure of all that cables and differences?Board Member-II (External)1) Why microprocessor is called 8/16 bit processor?2) What is diff between 8/16 bit processor?3) Why lower address data/address buses are multiplexed?4) Diff between data and address bus?5) Use of buses in microprocessor?6) How many address location will addressed with 16 address line?7) Function of cache memory?Board Member-III (External)1) What you will do for database loss and recovery?2) What is DDL and DML which command are belongs to both?3) What will be radix sort time complexity by big ohh method?4) Use of Data dictionary?5) What is schema?6) What is use of Data Flow Diagram (DFD)?Board Member-IV (Internal) (About my project of Z39.50 protocol development)1) What is your project of protocol?2) What facilities are provided by this protocol and usefulness?3) What you have developed and where it is useful?4) In which layer Z39.50 protocol works?5) What you will do for connect to computers generally?6) What type of network eshtablished in your office and which cable is used?7) Have you heard about RED?8) What is pass by value and pass by reference in programming?Board Member-V (Internal)1) What is XML?2) Where you have used XML in you project?(my project also have XML use)3) What is use of your project for in that organization?4) Where is Z39.50 protocol useful in application?



Interview Experience: (Ramana)

Chairman:

1. What are the various experiments you are done in your machines lab
2. How the vibration will come from the mobile phone when it is in that mode

Departmental Expert-1:

1. Why your eyes are in red colour, don't you have enough sleep yesterday's night
2. what is your favourate subject
3. What is meant by zpf... this term is related to which machine
4. What is meant by reluctance motor
5. write the expression for power developed in salient pole synchronous motor?
6. what is meant by load angle in detail
7. can you explain hunting breafly
8. Is there any method to reduce hunting
I think you studied power system analysis in your B.Tech....not power systems power system analysis

9. what are the various quantities required for design of power system
10. Can you tell the method for power system stability analysis
He gives clue for above question
11. explain equal area criterion analysis method

Departmental expert-2:

1. this question related to communication subject
2. what is meant by stepper motor
3. how the steps can achieve
4. what is meant by BLDC motor
5. what is the constructional and operational difference between BLDC motor and DC motor
6. without the brushes and commutator how can you achieve the current reversal?
for the above question Departmental Expert-1 gives 50% answer as clue...
7. what is the purposes of commutator in DC machines
8. In diesel engine trains how the exact system is there inside
9. how can we get the supply for fans and lights in trains
10. name the special generator used for above...?
for this question departmental expert-1 gives full answer

External expert:

1. instead of using AC transmission why we are using HVDC
2. What is the main adv. and dis adv. of HVDC
3. can you learn about the earth fault circuit breaker in houses
4. what is meant by MCB? how it works? which type of CB it is?

Departmental expert-1:

1. apart from the losses, cost etc etc..... the advantage of HVDC over any other....

Lastly the departmental expert-1 asks Well Mr. Ramana suppose if you are selected in this job, afterwards you got
other job based on B.Tech (example in ISRO that is also a R&d org.)then what do you do....


Order of importance to study for passing the exam....
1, Theory of computation Computability, complexity analysis ( important since others may ignore it and only few will answer it correctly so opportunity to score above others)

2, Compilers and system programming( language processors ,lex anlsis, etc) ( important since because of the same reason as above

3, algorithm design and problems different methods  for algorithms....(important since if u studied definitly you have a chance to beat the averages)

4, Computer architecture, pipe-lining etc....

try to understand and know the basics of these first and study it well it will help you go more....


of course the others OS,DS,Digital,and other in the syllabus also important but it will be under standable by average people easily so don't avoid them any way i know that all have somewhat basics about these subjects....

Previous years DRDO Interview Questions Papers shared by different candidates CSE/ECE/Ele/Mech

1) Coldest planet: Pluto
2) INS Shivali is the first:
3) Which one of the following was NOT indigenously 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 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

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?
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?