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Electrical Machines

Electrical Machines
A commutator with a diameter of 50 cm rotating at 1000 rpm. For a brush width of 1.5 cm, find the time of commutation in ms.

  0.573.
 0.649.
 0.443.
 0.512.

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Electrical Machines
For power factor improvement the synchronous motor is to be

 lightly loaded and over excited
 heavily loaded and underexcited
 heavily loaded and over excited
 lightly loaded and underecited

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Electrical Machines
Fifth harmonic component of the induced voltage in three phase AC generator can be eliminated by using a winding pitch of

 6 / 7.
 5 / 6.
 2 / 3.
  4 / 5.

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Electrical Machines
Transformers operating in parallel will share the load depending upon their

 rating.
 percentage impedance.
 efficiency.
 leakage reactance.

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Electrical Machines
Which type of bearing is provided in small induction motors to support the rotor shaft?

  Ball bearings.
  Cast iron bearings.
  Bush bearings.
None of these

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Electrical Machines
If an induction machine is run at above the synchronous speed it acts as

 an induction motor
 a synchronous motor
 an induction generator
None of these

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