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.
 50 W.
 100 W.
 25 W.

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Measurement and Instrumentation
A resistance is measured by the voltmeter-ammeter method employing dc excitation and a voltmeter of very high resistance connected directly across the unknown resistance. If the voltmeter and ammeter reading are subject to maximum possible errors of ± 2.4 % and ± 1.0 % respectively, then the magnitude of the maximum possible percentage error in the value of resistance deduced from the measurement is nearly

 ± 1%
 ± 2.4%
 ± 1.4%
 ± 3.4%

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Measurement and Instrumentation
The measurement of a quantity

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

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