ECE :: Measurements and Instrumentation
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A capacitance transducer can be used to measure
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The dynamometer principle can be used for
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Assertion (A): In hot wire instrument the material of hot wire in generally platinum iridium.
Reason (R): A hot wire ammeter is suitable for ac only
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A moving coil meter has a shunt of 0.02 Ω resistance. If coil resistance is 1000 Ω and a potential difference of 500 mV is required across it to cause full scale deflection, the current through shunt is
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Consider the following features of an instrument
- suitable for both ac and dc
- free from hysteresis and eddy current errors
- No waveform and frequency errors
- it is essentially a voltmeter
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Which one of the following effects is used in measuring power?
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The effect of lead resistance is important in measurement of
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A high resistance was measured by loss of charge method. The voltmeter resistance was 1010 ohms. The calculation gave the value of unknown resistance as 0.8 x 109 ohms. The true value of resistance is
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A resistance wire strain gauge has gauge factor 2. If stress is 100 mega newton/m2 and Young's modulus is 200 giga newton/ m2, the percentage change in gauge resistance due to stress is
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