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True or false: a three-phase machine can be run on a single-phase supply.

  • A.True, at full output and with no modification of any kind
  • B.False, since the machine would run at synchronous speed
  • C.True, with a capacitor arrangement and at reduced output
  • D.False, since a three-phase winding cannot be energised from one phase

Answer: C

A capacitor between two of the terminals gives an approximation to a rotating field, and the machine will develop perhaps half its rated output. It is a makeshift rather than a proper arrangement and the machine runs hot and unbalanced.

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