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Electrical Machines

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

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

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Electrical Machines
A short circuit test on a transformer gives

 copper loss at half load.
  copper loss at any load.
 copper loss at over load.
 copper loss at full load.

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Electrical Machines
At what power factor, the voltage regulation of a transformer can be zero ?

 Lagging power factor.
 Zero power factor.
 Unity power factor.
  Leading power factor.

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Electrical Machines
In DC generator, armature reaction refers to what?

  Effect of armature flux on the main field flux.
 Effect of field flux on the armature flux.
None of these
 Effect of armature flux on the load.

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Electrical Machines
Damper winding is used to

 decrease the load current.
 both 1 and 2.
 suppress the hunting.
 increase the load current.

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Electrical Machines
In which of the following speed control of DC motor the speed obtained is below than the rated speed?

 Armature voltage control.
 Field resistance control.
 Any of above.
 Armature circuit resistance control.

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