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The slip of a single-phase induction motor at full load is typically

  • A.rather larger than that of a comparable three-phase machine
  • B.very much smaller than that of a comparable three-phase machine
  • C.exactly the same as that of a comparable three-phase machine
  • D.negative

Answer: A

The backward field's braking torque has to be overcome as well as the load, so the machine slips further to develop the necessary forward torque. Slips of five or six per cent are usual against two or three for a three-phase machine.

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