An energy meter makes 100 revolutions of its disc per unit of energy. The number of revolutions made by the disc during one-hour when connected across 210 V source and drawing a current of 20 A at 0.8 pf leading is

An energy meter makes 100 revolutions of its disc per unit of energy.

1.	An energy meter makes 100 revolutions of its disc per unit of energy. The number of revolutions made by the disc during one-hour when connected across 210 V source and drawing a current of 20 A at 0.8 pf leading is
A.	336
B.	316
C.	286
D.	256
Answer» B. 316

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An energy meter makes 100 revolutions of its disc per unit of energy. The number of revolutions made by the disc during one-hour when connected across 210 V source and drawing a current of 20 A at 0.8 pf leading is

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