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Measurement and Instrumentation

Measurement and Instrumentation
In the bridge given in the figure, the reading of the high impedance voltmeter is

 - 3.33 V.
 Zero.
 4.20 V.
 6.66 V.

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Measurement and Instrumentation
A 50 Hz bar primary CT has a secondary with 500 turns. The secondary supplies 5 A current into a purely resistive burden of 1Ω. The magnetizing ampere-turn is 200. The phase angle between the primary and secondary current is

  4.6o.
 85.4o.
 94.6o.
 175.4o.

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Measurement and Instrumentation
The pointer of an indicating instrument is generally made of _______

Copper
Silver
Soft steel
Aluminium

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Measurement and Instrumentation
The total current I = I1 + I2 in a circuit is measured as I1 = 150 ± 1A , I2 = 250 ± 2A, where the limits of error are as standard deviations. I is measured as

 (400 ± 2.24) A
 (400 ± 1.5) A
 (400 ± 3) A
 (400 ± 1) A

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Measurement and Instrumentation
The disc of an instrument using eddy current damping should be of

Non conducting and magnetic material
None of the listed here
Conducting and magnetic material
Conducting and non magnetic material

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Measurement and Instrumentation
The range of a moving iron ac ammeter is extended by

A multiplier
None of the listed here
Changing number of turns of operating coil
A shunt

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