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

  0 W.
 25 W.
 100 W.
 50 W.

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Measurement and Instrumentation
Which of following statement are correct in case of power factor meter?

 The restoring torque is provided by a controlling torque.
 The deflection is proportional to phase angle between field coil and crossed coil.
 Both B and C.
 It consist of two coils mounted at right angles to each other.

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