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

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

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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 meter does not respond to DC signals
The error is high due to eddy current effect
The error is high due to hysteresis effect

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