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The air gap of an induction machine is made as small as mechanically practicable in order to

  • A.reduce the magnetising current required
  • B.increase the leakage reactance of the windings
  • C.reduce the resistance of the rotor circuit
  • D.increase the slip at which the machine runs

Answer: A

The gap dominates the reluctance of the magnetic circuit, so a smaller gap needs fewer ampere-turns to establish the flux and gives a better power factor. Bearing tolerances and rotor deflection set the practical floor.

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