Measurements and Instrumentation - ECE Questions and Answers

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A 0-200 V voltmeter has an accuracy of 0.75% of full scale reading. If voltage measured is 100 V, the error is

1.5%

.75%

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In Schering bridge, the potential of detector above earth potential is about

a few volts

10 kV

1000 V

either (a) or (b)

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The dimensions of EMF are

ML²I^-1T^-3

M^-1T^-3

ML²I^-2T^-3

ML³I^-1T^-3

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Which of the following instruments has non-linear scale?

Moving coil instrument
Moving iron instrument
Electrostatic instrument
Rectifier instrument

Select the answer as per following codes

2 only

2 and 3 only

2, 3 and 1

1, 2, 3 and 4

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The power input and output in a device are 3650 W and 3385 W with each reading in doubt by ± 10 W. The percentage uncertainty in losses is

± 7.55%

± 3.77%

± 11.32%

± 15.09%

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A meter coil has a resistance of 100 Ω and a full scale deflection current of 10 mA. To convert it into a voltmeter of 0-200 V range, the series resistance should be

20 kΩ

19.9 kΩ

1.9 kΩ

20.1 kΩ

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Which of these has a magnetic brake?

Thermocouple ammeter

Energy meter

Dynamometer wattmeter

Frequency meter

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Two numbers are 131 ± 5 and 629 ± 3. The sum of the numbers with range of doubt is

760 ± 8

760 ± 2

760 + 8

760 - 8

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Assertion (A): Schering bridge is a low voltage bridge.

Reason (R): Schering bridge is very commonly used for measurement of capacitance.

Both A and R are true and R is correct explanation of A

Both A and R are true but R is not correct explanation of A

A is true R is false

A is false R is true