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Electrical Machines

Electrical Machines
What will be the maximum power factor of an induction motor for dispersion coefficient of 0.05?

 20.
  0.905.
 1.1.
  0.05.

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Electrical Machines
A 8 pole, 50 Hz single phase induction motor is running at 690 rpm. Its slip with respect to forward field is

 1.92
 -0.08
 -1.92
 0.08

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Electrical Machines
Brushes are always placed on--------------- , in order to achieve sparkles commutation?

 GNA
None of these
 MNA
 either GNA or MNA

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Electrical Machines
Conservator tank is used

 to act as an oil storage.
 for better cooling of transformer.
None of these
 to take up the expansion of oil due to temperature rise.

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Electrical Machines
Generators work on the principle of production of

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

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Electrical Machines
In induction motor the 7th harmonic torque may make the motor rotate at (1 / 7)th synchronous speed. This is called

  resonance.
  crawling.
  harmonics.
  cogging.

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