Measurements and Instrumentation
If reference sound pressure P0 is 2 x 10-5 N/m2, a sound pressure of 90 dB is equal to
Answer: A
.
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Kelvin's double bridge is used to measure low resistances because
Answer: D
Effect of lead and contact resistances is very important in measurement of low resistances.
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If an inductance L is connected in one arm of bridge and resistance R1, R2, R3 in other three arms
Answer: A
To balance the bridge both magnitudes and phase angles of voltages have to be balanced.
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The coil of a moving iron instrument has a resistance of 500 Ω and an inductance of 1 H. It reads 250 V when a 250 V dc is applied. If series resistance is 2000 Ω, its reading when fed by 250 V, 50 Hz ac will be
Answer: D
No Explanation.
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Which of the following measurements using a dc potentiometer do not require standardisation of potentiometer?
Answer: B
Unknown resistance is compared with a standard resistance. Therefore standardisation of potentiometer is not necessary.
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