GATE IN topic:measurements PYQs & Answers — Page 4

Questions 31–40 of 59. Imported answers require independent review unless marked reviewed.

In an ac main, the rms voltage

, rms current

and power

are measured as:

and

(errors are with respect to readings). The percentage error in calculating the power factor using these readings is

Your answerChoose one option.

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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 piezoresistive pressure sensor has a sensitivity of 1 (mV/V)/kPa. The sensor is excited with a dc supply of 10 V and the output is read using a 3 ½ digit 200 mV full-scale digital multimeter. The resolution of the measurement set-up, in pascal is ___.

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A 10½ digit Counter-timer is set in the ‘frequency mode’ of operation (with

s). For a specific input, the reading obtained is 1000. Without disconnecting this input, the Counter-timer is changed to operate in the ‘Period mode’ and the range selected is microseconds (

s, with

MHz). The counter will then display

Your answerChoose one option.

100

1000

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A 3½ digit, rectifier type digital meter is set to read in its 2000 V range. A symmetrical square wave of frequency 50 Hz and amplitude ±100 V is measured using the meter. The meter will read _____.

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A bar primary current transformer of rating 1000/1 A, 5 VA, UPF has 995 secondary turns. It exhibits zero ratio error and phase error of 30 minutes at 1000 A with rated burden. The watt loss component of the primary excitation current in ampere is __________ (rounded off to one decimal place).

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In the bridge circuit shown, the voltmeter V showed zero when the value of the resistors are:

, and

. If

, the value of

in ohm is _____.

Diagram for Instrumentation Engineering question 52

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A Q meter is best suited for the measurement of the ____.

Your answerChoose one option.

Quality factor of a capacitance.

Distributed capacitance of a coil.

Quality factor of piezoelectric sensor.

Turns-ratio of a transformer

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Two 100

resistors, having tolerance 3 % and 4 % are connected in series. The effective tolerance of the series combination (in %, rounded off to one decimal place) is ____.

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Assuming that the opamp used in the circuit shown is ideal, the reading of the 1 Hz bandwidth, permanent magnet moving coil (PMMC) type voltmeter (in volts) is ____

Diagram for Instrumentation Engineering question 38

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GATE IN topic:measurements PYQs

Question 5

Question 16

Question 20

Question 32

Question 50

Question 51

Question 52

Question 9

Question 25

Question 38