Measurement and Instrumentation
In figure Z1 = 200∠60° ohm. Z2 = 400∠-90° ohm, Z3 = 300∠0° ohm. Then Z4 for bridge to be balanced is

 150∠30° ohm.
 600∠-150° ohm.
 300∠90° ohm.
 400∠-90° ohm.

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

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Measurement and Instrumentation
Why is a MISC meter not recommended for DC measurement?

The meter is calibrated for AC and it’s error for DC would be high
The error is high due to hysteresis effect
The meter does not respond to DC signals
The error is high due to eddy current effect

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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,

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

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