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A meter marked 1200 rev/kWh makes 20 revolutions in 30 seconds. The load is

  • A.24 kW
  • B.40 kW
  • C.2 kW
  • D.0.5 kW

Answer: C

The energy is \( 20/1200 = 0.01667 \) kWh, and dividing by the period expressed in hours, \( 30/3600 = 0.00833 \) h, gives 2 kW. The general form is \( P = 3600n/(Kt) \) with n revolutions in t seconds and K in rev/kWh.

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