ISRO Scientist or Engineer Electronics Dec 2017

Instructions

For the following questions answer them individually

Question 11

Relationship between doppler frequency shifts of two radars A and B having 0.1 foot and 0.05 foot wavelengths, approaching the target at 1000 feet per second and 2000 feet per
second rate respectively, will be

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Question 12

A sinusoidal input which can be reproduced in an OP-AMP without any distortion having slew rate of $$10 \pi \frac{V}{\mu s}$$ and 5V peak output amplitude, has the maximum frequency of

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Question 13

Which of the following is NOT a characteristic of Schottky Diode?

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Question 14

A Sensistor exhibits the following characteristics

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Question 15

When an electromagnetic wave is incident on an object having surface roughness comparable to the wavelength, then

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Question 16

For the following circuit, determine the output voltage $$‘V_{0}’$$ in terms of input voltages $$V_{1}$$ and $$V_{2}$$ , assuming $$A_{1} and A_{2}$$ are ideal op-amps

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Question 17

Dominant mechanism for motion of charge carriers in forward and reverse biased silicon p-n junctions are

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Question 18

Which of the following is NOT true about opto-couplers?

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Question 19

Which of the noise types is dominant in Metal Semiconductor Field Effect Transistor (MESFET) when compared to Bipolar Junction Transistor (BJT)?

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Question 20

Which factor determines the range resolution of a radar?

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