ECE :: Measurements and Instrumentation
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Assertion (A): If the resistance of shunt of an ammeter is increased, the range of ammeter is reduced.
Reason (R): If the series resistance of a voltmeter is increased, the range of voltmeter is increased.
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Two sinusoidal signals of equal amplitude and frequency are applied to X and Y plate of CRO respectively. The observed Lissajous pattern is a straight line. The phase shift between signals is
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The scale of a dynamometer is linear when used as
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Three phase four wire induction energy meter is used to measure
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Thermistors are made of
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To measure a resistance of about 8 ohms we should use
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For measuring temperatures below 800°C with high accuracy, the best instrument is
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Assertion (A): Many instruments use eddy current damping.
Reason (R): Eddy currents set up a magnetic flux which opposes the original movement which generates them.
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