Measurement and Instrumentation
Assertion (A) : Precision is a necessary prerequisiteof accuracy. Reason (R) : Precision guarantees accuracy.

 A is false bur R is true
 Both A and R are true but R is NOT the correct explanation of A
 A is true but R is false
 Both A and R are true and R is the correct explanation of A

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

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

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Measurement and Instrumentation
For power measurement of three phase circuit by two wattmeter method, when the value of power factor is less than 0.5 lagging

Both give the same readings
One of the wattmeter connections will have to be reversed
One of the wattmeters will read zero
Pressure coil of the wattmeter will become ineffective.

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