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Electrical Machines

Electrical Machines
When the rotor of a 3 phase induction motor is blocked then the slip is

  1.
 0.7.
  0.54.
 0.3.

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Electrical Machines
Generators work on the principle of production of

None of these
 statically induced emf.
 dynamically induced emf.
 dynamically and statically induced emf.

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Electrical Machines
Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. The highest speed of the alternators is

  3000 rpm.
  600 rpm.
  500 rpm.
  3600 rpm.

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Electrical Machines
Exciting current of an induction motor is

  none of these.
  lesser than power transformer.
  equal as power transformer.
  higher than power transformer.

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Electrical Machines
For successful parallel operation of two single phase transformers, the most essential condition is that their

 percentage impedances are equal
 turn- ratios are exactly equal
 polarities are properly connected
 KVA ratings are equal

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Electrical Machines
In induction motors, there is large decrease in maximum power factor when the dispersion coefficient is ________________.

 remains same.
  increased.
 kept constant to certain value.
 decreased.

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