Measurement and Instrumentation
The measurement of a quantity

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

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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

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

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