DRDO EXAM PAPERS

DRDO Sample Questions

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.

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
    
    PART II Genreal 50 General Non-Technical[4 Options]
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  
    The New Biotechnology Software intorduced by TCS is?
16. The New Biotechnology Software intorduced by TCS is?   What is Wi Fi?
17. Which is the fastest Cruise Missile?
    
    
    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:
    
18. 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
    
19. 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:

1. Which one of the pulses has the same form in time domain as well as in frequency domain
                 Rectangular
                 Exponenetial
                 Triangular
                 Gaussian
   
2. 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
   
   
3. 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
   
   
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
   
   
5. 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.
   
6. 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 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
   
   
   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?
                                                                                                     
   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?

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