Measurements and Instrumentation
Assertion (A): Schering bridge is a low voltage bridge.
Reason (R): Schering bridge is very commonly used for measurement of capacitance.
Answer: D
Schering bridge is a high voltage bridge.
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Two numbers are 131 ± 5 and 629 ± 3. The sum of the numbers with range of doubt is
Answer: A
The numbers can be 131 + 5, 131 - 5, 629 - 3. Therefore, the sum can be 760 ± 8.
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Which of these has a magnetic brake?
Answer: B
Braking torque, in an energy meter, is provided by a magnet.
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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
Answer: B
.
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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
Answer: A
Losses = 3650 - 3385 = 265 W uncertainty = ± 20 W.
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