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

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

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Measurement and Instrumentation
A DC potentiometer is the best means available for the measurement of DC voltage because

  It is based on null balance technique.
 None of above.
 It is possible to standardize before a measurement is undertaken.
 The precision in measurment is independent of the type of the defector used.

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