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The lag adjustment of a meter is checked at a power factor of

  • A.zero
  • B.0.8 lagging
  • C.0.5 lagging
  • D.unity

Answer: C

An error in the quadrature angle shows itself as a power factor dependent error, so it is invisible at unity power factor and plain at 0.5. The routine is to set the full-load speed at unity power factor with the braking magnet, then correct the lag at 0.5.

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