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Electrical Machines

Electrical Machines
The emf induced in a conductor rotating in a bipolar field is

None of these
 AC.
 DC.
 both of above.

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Electrical Machines
In case of a dc motor the ratio Eb / E is indicative of

  ratio of starting to running torque.
  efficiency.
  ratio of starting to running current.
  ratio of input to output voltage.

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Electrical Machines
Star - delta method of starting of motor is not possible in case of

  high speed motor.
  single phase induction motor.
  high torque motor.
  low horse power motor.

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Electrical Machines
Which of the following rotor requires damper winding?

 Cylindrical rotor.
None of these
 Both type rotor.
 Salient pole rotor.

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Electrical Machines
If the flux of DC motor approaches zero, its speed will

 remain unchanged.
 between zero and infinity.
 aprroach infinity.
 approach zero.

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Electrical Machines
DC machine windings are

 full pitched
None of these
 short pitched
 either of these

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