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A transformer with a per unit impedance of 5 per cent supplying a unity power factor load at full load has a regulation of about

  • A.zero, regulation being absent at unity power factor
  • B.the resistive component alone, a fraction of a per cent
  • C.5 per cent, equal to the whole impedance
  • D.10 per cent, twice the impedance

Answer: B

At unity power factor the reactive drop is in quadrature and contributes only to the second order, so the regulation is nearly the resistive component. It is a useful check on whether a regulation calculation has been done correctly.

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