Measurement and Instrumentation
A sampling wattmeter is used to measure the average power of a load. The peak to peak voltage of a square wave is 10 V and the current is triangular wave of 5 Amp P-P as shown in the figure. The period is 20 ms. The reading in W will be

 25 W.
 100 W.
  0 W.
 50 W.

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

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