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The dial test of an energy meter consists in

  • A.counting the revolutions of the disc over a short interval with a stopwatch
  • B.checking that each pointer of the register advances by exactly one division
  • C.comparing the readings of the pointers with those of a cyclometer register
  • D.running it for a measured period and reading the register

Answer: D

It tests the whole chain including the gear train and register, whereas counting disc revolutions tests only the driving element. A long run is needed for a useful result, so it is used for a final check rather than for adjustment.

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