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  #1  
January 13th, 2018, 04:06 PM
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ISRO for ECE

I have completed B.Tech Degree with ECE discipline recently. My dream is to join ISRO. So I have to appear in Exam conducted by ISRO. So please provide previous year question papers of ECE discipline to know about pattern of recruitment exam of ISRO?
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  #2  
January 15th, 2018, 08:18 AM
Super Moderator
 
Join Date: Mar 2012
Re: ISRO for ECE

As you want to download previous year question paper of ISRO Recruitment Exam for ECE discipline, so here I am providing question paper:

ISRO Question Paper for ECE Discipline

1. How does the dynamic resistance of diode vary with temperature?
a. Directly proportional
b. Inversely proportional
c. Independent
d. Directly to the square of temperature

2. The electric field component of a time harmonic plane EM wave traveling in a non-magnetic lossless dielectric medium has amplitude of 2 V/m. If the relative permittivity of the medium is 4, the magnitude of the time average power density vector in W/m2 is
a. 1/30π
b. 1/120π
c. 1/60π
d. 1/240π

3. The force on a point charge +q kept at a distance ‘d’ from the surface of an infinite grounded metal plate in a medium of permittivity ε is
a. 0
b. q2/16πεd2 away from the plate
c. q2/16πεd2towards the plate
d. q2/4πεd2 towards the plate

4. A material has conductivity of 10-2 mho/m and a relative permittivity of 4. The frequency at which the conduction current in the medium is equal to the displacement current is
a. 45 MHz
b. 90 MHz
c. 450 MHz
d. 900 MHz

5. A system has fourteen poles and two zeros. Its high frequency asymptote in its magnitude plot having a slope of
a. – 40 dB/decade
b. – 240 dB/decade
c. – 280 dB/decade
d. – 320 dB/decade

6. A 1mW video signal having a bandwidth of 100 MHz is transmitted to a receiver through a cable that has 40 dB loss. If the effective one sided noise spectral density at the receiver is 10-20 Watt/Hz, then the signal to noise ratio at the receiver is
a. 50 dB
b. 30 dB
c. 40 dB
d. 60 dB

7. When the 8051 is reset and the line is HIGH, the program counter points to the first program instruction in the
a. Internal code memory
b. External code memory
c. Internal data memory
d. External data memory

8. How is the status of the carry, auxiliary carry and parity flag affected after executing instructions?
MOV A, #9CH
ADD A, #64H
a. CY = 0, AC = 0, P = 0
b. CY = 1, AC = 1, P = 0
c. CY = 0, AC = 1, P = 0
d. CY = 1, AC = 1, P = 1

9. In the given combinational logic, X is given by

10. Each transistor in Darlington pair (as shown in Fig) has hfe = 100. Overall hfe of composite transistor neglecting leakage current is,
a. 10000
b. 10001
c. 10100
d. 10200

11. In a given network shown in figure, a steady state is reached with switch ‘k’ open. At t=0, which is closed. Determine the values of I1, I2 and I3 at t = 0+ (in Amperes).
a. 1, 1/3, 0
b. 1/3, 1/3, 1/3
c. 0, 0, 0
d. 1, 1, 1

12. Simplify Boolean function represented in sum of products of min-terms, F(x,y,z) = ∑m(0,2,4,5,6)

13. A system is described by the transfer function H(s) = 1/(S3 + αS2 + kS + 3) is stable. The constraints on α and k are
a. α > 0, αk < 3
b. α > 0, αk > 3
c. α > 0, αk > 0
d. α > 0, αk < 0

14. Consider a unity feedback system whose open loop transfer function is G(s) = k/s(s2 + 2s +2). The Nyquist plot for this system is

15. Eye diagram gives an idea of
a. Modulation scheme
b. Clock jitter
c. SNR
d. All of the above

16. The signal flow diagram for a certain feedback control system is shown in figure.
Now consider the following set of equations for the nodes.
1. x2 = a1x1 + 19x3
2. x3 = a2x2 + a8x4
3. x4 = a3x3 + a5x2
4. x5 = a4x4 + a6x2
Which of the following are correct?
a. 1, 2 and 3
b. 1, 3 and 4
c. 2, 3 and 4
d. 1, 2 and 4

17. The appropriate output frequency of 555 oscillator for RA = RB = 2.2 kΩ and C = 2000 pF
a. 110 kHz
b. 109.3 kHz
c. 120.5 kHz
d. 108.9 kHz

18. A counter is designed using J-K flip flop as shown in figure.
Define its count sequence
a. 000, 001, 010, 011, 100 & repeats
b. 100, 011, 010, 001, 000 & repeats
c. 010, 011, 100, 000, 001 & repeats
d. 101, 110, 111, 000, 001, 010, 011, 100 & repeats

19. A 1 MHz clock signal is applied to a J-K flip flop with J=K=1. What is the frequency of the flip flop output signal?
a. 2 MHz
b. 500 kHz
c. 250 kHz
d. 500 MHz

20. How many inputs and outputs does a full adder have?
a. 3,2
b. 2,3
c. 3,3
d. 2,2

21. Which shift register counter requires the most decoding circuitry?
a. Jhonson counter
b. Ring counter
c. Ripple counter
d. MOD counter

22. A 10 bit DAC has step size of 10mV. What is its Full scale output voltage and the percentage resolution?
a. 10.24 V, 0.2 %
b. 10.23 V, 0.5 %
c. 10.23 V, 0.1 %
d. 10.24 V, 0.1 %

23. If the input signals A , B and output signals are shown as below, then the circuit element is
a. AND gate
b. OR gate
c. NOR gate
d. XOR gate

24. For a 10 bit digital ramp ADC using 500 kHz clock, the maximum conversion time is
a. 2048 µs
b. 2064 µs
c. 2046 µs
d. 2084 µs

25. In digital filters, how many interpolated data points are inserted between samples when performing 4X over sampling?
a. 2
b. 3
c. 4
d. 5

26. A PAM source generates four symbols 3 V, 1 V, – 1 V and – 3 V with probabilities of 0.2, 0.3, 0.3 and 0.2 respectively. The variance for this source will be
a. 4.2 V
b. 3.2 V
c. 3.6 V
d. 4.6 V

27. The output equivalent circuit of following circuit is
a. INVERTER
b. AND
c. OR
d. NOR

28. A binary source in which 0’s occur 3 times as often as 1’s. Then its entropy in bits/symbol will be
a. 0.75 bits/symbol
b. 0.25 bits/symbol
c. 0.81 bits/symbol
d. 0.85 bits/symbol

29. Maximum value of signal to noise ratio of an 8 bit ADC with an input range of 10 volts will be
a. 50 dB
b. 43.8 dB
c. 48.9 dB
d. 49.8 dB

30. The available power required at a receiver antenna I is 10-6 watts. Transmitting and receiving antennas have gain of 40 dB each. The carrier frequency is 4 GHz and the distance between them is 30 miles. The required transmitted power is
a. 0.64 Watts
b. 0.74 Watts
c. 0.78 Watts
d. 0.32 Watts

31. An FM signal at 10.7 MHz IF needs to be digitized for demodulation in a digital domain. If the bandwidth of this signal is 200 kHz, the maximum usable sampling frequency is
a. 200 kHz
b. 600 kHz
c. 400 kHz
d. 800 kHz

32. A satellite system employs QPSK modulation with 40% excess bandwidth per carrier including guard band. The voice channels use 64 kbps PCM coding. The number of channels supported by 36 MHz bandwidth of the transponder in bandwidth limited case will be
a. 1000
b. 800
c. 900
d. 600

33. Hamming codes are used for
a. Burst error correction
b. Signal error correction
c. Both a and b
d. None of the above

34. Which statements is correct for Schottkey diode?
a. Current voltage characteristics is totally different than that of a PN junction diode
b. The current is controlled by the diffusion of minority carriers
c. The current results from the flow of minority carriers
d. The storage time ts is almost zero

35. Photo diodes operate at
a. Forward bias
b. Breakdown region
c. Reverse bias
d. Saturation region

36. The dynamic resistance of diode varies as
a. 1/I2
b. 1/I
c. I
d. I2

37. In a PN diode, with the increase in reverse bias, the reverse current
a. Increases
b. Decreases
c. Remain constant
d. Uncertain

38. The Nyquist filter has impulse response given by

39. The figure shown is a signal space diagram for
a. Quadrature QPSK
b. Binary FSK
c. Bi-phase PSK
d. MSK

40. Negative feedback in amplifiers
a. Improves the signal to noise ratio at the input
b. improves the signal to noise ratio at the output
c. Does not affect the signal to noise ratio at the output
d. All of the above


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