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Electrical Machines

Electrical Machines
Direct axis reactance is defined as the ratio of

 Vmin to Imax
 Vmin to Imin
 Vmax to Imax
 Vmax to Imin

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

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

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Electrical Machines
A generator may loose residual magnetism due to

  any of these.
  vibrations.
  over excitation.
  heating.

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Electrical Machines
Under operating conditions the rotor conductor should be _________________ in induction motor.

  always closed.
  none.
  always opened.
  semi closed or semi opened.

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Electrical Machines
The rotor electromotive force of the IM is observed to make 100 complete alterations per minute, calculated slip

None of these
 0 .001 %.
 3 %.
  3.33 %.

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Electrical Machines
In induction motor especially the cage rotors slots are nearly parallel to shaft axis. This is called

  skewing.
  slip.
  crawling.
  cogging.

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