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Electrical Machines

Electrical Machines
The 3 - Φ induction motor with rotor circuit open will

  run normally.
  not run.
  get over heated.
  make noise.

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Electrical Machines
Magnetic field of a DC generator is produced by what?

 Both B and C.
 Permanent magnets.
 None of the options.
  Electromagnets.

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Electrical Machines
Why are capacitors used with large AC induction motor?

  Improve current level.
  Improve power level.
  Improve power factor.
  Improve voltage level.

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Electrical Machines
In a transformer, the frequency of a voltage at the secondary is

 any of the above.
 less than primary.
 equal to primary.
 greater than the primary.

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Electrical Machines
The overall power factor of an on load transformer

 is always leading.
  depends on the power factor of the load.
 is always lagging.
 is always unity.

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Electrical Machines
A smaller air gap in a polyphase induction motor helps to

  reduce the magnetizing current.
  reduce the chance of cogging.
  reduce the chance of crawling.
  increase the starting torque.

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