question_answer 28)

  When a voltage measuring device is connected to AC mains, the meter shows the steady input voltage of 220 V. This means (a) input voltage can not be AC voltage, but a DC voltage (b) maximum input voltage is 220 V (c) the meter reads not but  and is calibrated to read (d) the pointer of the meter is stuck by some mechanical defect

Answer:

  (c)The voltmeter connected to A.C. mains is calibrated to read root mean square value or virtual value of a.c. voltage, i.e., . Choice (c) is correct.