GATE IN Communication and Optical Instrumentation PYQs & Answers — Page 4

Questions 31–34 of 34. Imported answers require independent review unless marked reviewed.

The figure shows a phase locked loop. The output frequency is locked at

kHz. The value of

in kHz is ______.

Diagram for Instrumentation Engineering question 16

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Quantum efficiency of a photodiode (ratio between the number of liberated electrons and the number of incident photons) is 0.75 at 830 nm. Given Planck’s constant

, the charge of an electron

and the velocity of light in the photodiode

. For an incident optical power of 100 μW at 830 nm, the photocurrent in μA is ________.

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In a sinusoidal amplitude modulation scheme (with carrier) the modulated signal is given by

, where

is the carrier frequency and

is the modulation frequency. The power carried by the sidebands in % of total power is ________%.

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An angle modulated signal with carrier frequency

rad/s is given by

. The maximum deviation of the frequency in the angle modulated signal from that of the carrier is ________ kHz.

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GATE IN Communication and Optical Instrumentation PYQs

Question 16

Question 53

Question 54

Question 55