Discussion
Assertion: the integrating period of a digital voltmeter is made a whole number of mains periods. Reason: the average of a sinusoid over its own period is zero.
Answer: B
Mains hum superimposed on the input averages exactly to nothing over a whole number of its own cycles, so the integrator sees only the wanted signal. This is the entire reason for the twenty millisecond period and the reason given is the correct one.
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