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

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Measurement and Instrumentation
Assertion(A): A low power factor wattmeter has special constructional features to ensure accurate measurment. Reason(R): Extension of wattmeter range in DC circuit can be easily done by using current and potential transformer

 A is true R is false.
 Both A and R is true and R is not correct explanation of A.
 A is false R is true.
 Both A and R is true and R is correct explanation of A C.

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Measurement and Instrumentation
A resistance is measured by the voltmeter-ammeter method employing dc excitation and a voltmeter of very high resistance connected directly across the unknown resistance. If the voltmeter and ammeter reading are subject to maximum possible errors of ± 2.4 % and ± 1.0 % respectively, then the magnitude of the maximum possible percentage error in the value of resistance deduced from the measurement is nearly

 ± 1.4%
 ± 1%
 ± 3.4%
 ± 2.4%

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