GATE IN 2017 Paper 1 — page 18

Questions 52–54 of 65. Imported answers require review unless explicitly marked reviewed.

The junction semiconductor temperature sensor shown in the figure is used to measure the temperature of hot air. The output voltage

is 2.1 V. The current output of the sensor is given by

where

is the temperature in K. Assuming the opamp to be ideal, the temperature of the hot air in °C is approximately ________.

Diagram for Instrumentation Engineering question 52

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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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2017 · Paper 1

Question 52

Question 53

Question 54