Measurement and Instrumentation
The coil of a moving iron instrument has a resistance of 500 ohm and inductance of 1 H. It reads 250 V when a 250 V DC is applied. It series resistance is 2000 ohms its reading when fed by 250 V, 50 Hz AC will be

 248 V.
 250 V.
 260 V.
 252 V.

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Measurement and Instrumentation
A resistance of 105 ohms is specified using significant figures as indicated below : 1. 105 ohms 2. 105.0 ohms 3. 0.000105 mega ohms Among these,

 1, 2 and 3 represent same precision.
 2 represents greater precision but 1 and 3 represent same precision.
 1 represents greater precision than 2 and 3.
 2 and 3 represent greater precision than 1.

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