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Which motor is NOT suitable for use as a DC machine?

  • A.Permanent magnet motor
  • B.Series motor
  • C.Squirrel cage motor
  • D.Synchronous motor

Answer: C

The squirrel cage motor cannot be used as a DC machine.

It is an induction motor: it works only on alternating current, whose changing field induces current in the rotor bars. Permanent magnet, series and synchronous machines can all be built to run on direct current.

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