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An energy meter is tested by the phantom loading method chiefly to

  • A.allow the meter to be tested at a power factor which the real load cannot provide
  • B.eliminate the friction of the bearings during the period of the test
  • C.test several meters simultaneously from one source of supply
  • D.avoid drawing the full power from the supply

Answer: D

The pressure circuit is fed at rated voltage from one source while the current circuit is fed at rated current from a separate low-voltage source. The power drawn is then only the losses of the two circuits, which for a large meter is a great saving.

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