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

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Measurement and Instrumentation
The measurement of a quantity

 is a comparison of an unknown quantity with known quantity.
  is a comparison of an unknown quantity with standard.
 is a comparison of an unknown quantity with another quantity.
 none of these.

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