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A meter tested at 5 per cent of rated current runs 6 per cent slow, and the permitted tolerance at that load is 3.5 per cent. The adjustment to make is to

  • A.increase the light-load compensation
  • B.move the braking magnet inward toward the centre of the disc
  • C.alter the lag adjustment on the shunt magnet of the meter
  • D.increase the overload compensation on the series magnet

Answer: A

Running slow at a small fraction of rated current is the signature of friction not fully compensated, and the friction adjustment is exactly the control provided for it. The braking magnet would shift the whole characteristic and spoil the full-load setting already made.

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