GATE IN format:nat PYQs & Answers — Page 13

Questions 121–130 of 270. Imported answers require independent review unless marked reviewed.

Topic practice 270 questionsPage 13 of 27

In the circuit shown, the switch is initially closed. It is opened at

and remains open thereafter. The time (in milliseconds) at which the output voltage

becomes LOW is ______ (round off to three decimal places)

Diagram for Instrumentation Engineering question 64

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In the Wheatstone bridge circuit shown,

and

. The switch is initially open and the voltage between the points C and D is

. Upon closing the switch at

, the resistance in the arm AD changes by an amount

, and the voltage between C and D changes by

. The sensitivity of the bridge (in volt/kilohm), defined as

, is ________ (round off to two decimal places)

Diagram for Instrumentation Engineering question 65

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A single-phase transformer has a magnetizing inductance of 250 mH and a core loss resistance of 300

, referred to primary side. When excited with a 230 V, 50 Hz sinusoidal supply at the primary, the power factor of the input current drawn, with secondary on open circuit, is ____ (rounded off to two decimal places).

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Taking

as positive for clockwise encirclement, otherwise negative, the number of encirclements

in the Nyquist plot of

is _____.

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The diode used in the circuit has a fixed voltage drop of 0.6 V when forward biased. A signal

is given to the ideal OpAmp as shown. When

is at its positive peak, the output (

) of the OpAmp in volts is _____.

Diagram for Instrumentation Engineering question 14

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The transistor Q₁ has a current gain

and the transistor Q₂ has a current gain

. The current

in microampere is ______.

Diagram for Instrumentation Engineering question 15

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A 300 V, 5 A, LPF wattmeter has a full scale of 300 W. The wattmeter can be used for loads supplied by 300 V ac mains with a maximum power factor of __________ (rounded off to one decimal place).

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A 10-bit ADC has a full-scale of 10.230 V, when the digital output is (11 1111 1111)₂. The quantization error of the ADC in millivolt is _________.

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A strain gage having nominal resistance of 100

has a gage factor of 2.5. If the strain applied to the gage is 100

m/m, its resistance in ohm will change to __________ (rounded off to two decimal places).

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Given: Density of mercury is 13,600 kg/m³ and acceleration due to gravity is 9.81 m/s². Atmospheric pressure is 101 kPa. In a mercury U-tube manometer, the difference between the heights of the liquid in the U tube is 1 cm. The differential pressure being measured in pascal is ______ (rounded off to the nearest integer).

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GATE IN format:nat PYQs

Question 64

Question 65

Question 12

Question 13

Question 14

Question 15

Question 16

Question 17

Question 18

Question 19