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Measurement and Instrumentation

Measurement and Instrumentation
A 150 V moving iron voltmeter of accuracy class 1-0 reads 75 V when used in a circuit under standard condition. The maximum possible percentage error in the reading is

 1.5%
 1%
 2%
 2.5%

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Measurement and Instrumentation
The total current I = I1 + I2 in a circuit is measured I1 = 150 ± 3A , I2 = 250 ± 4 A, where the limits of error are given as standard deviations. I is measured as

 (400 ± 3) A
 (400 ± 1) A
 (400 ±5) A
 (400 ± 2.24) A

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Measurement and Instrumentation
A thermometer having first order dynamics is subjected to a sudden temperature change of 30oc to 150oc. If it has he time constant of 5 sec, what temperature will be indicated by after 5 sec?

 30o.
 150o.
 63.25o.
 105.6o.

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Measurement and Instrumentation
A null type instrument as compared to a deflected type instrument has

 a lower sensitivity.
 a higher accuracy.
 a faster response.
All of these

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Measurement and Instrumentation
The core flux in the CT of above question no.6, under the given operating conditions is

 1000 mWb.
 225 mWb.
 0.
 450 mWb.

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Measurement and Instrumentation
A megger is usually

Moving iron type instrument
Electro-static type instrument
Hot-wire type instrument
Moving coil type instrument

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