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Electrical Machines

Electrical Machines
Field weakening control method is used for the _________ ?

 both A and B
 above rated speed
 below rated speed
None of these

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Electrical Machines
In salient pole synchronous machine, if direct axis reactance and quadrature axis reactance is equal, then power developed due to reluctance is

 maximum
 infinite value
 zero
 any of the above

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Electrical Machines
If the applied voltage of a DC motor is 230 V, then back emf, for maximum power developed is

 230 V.
 115 V.
 200 V.
 460 V.

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Electrical Machines
A triangular mmf wave is produced in the air gap of an electric machine. Such wave is produced by

 stator of a induction machine.
 stator of a dc machine.
 rotor of an synchronous machine.
 rotor of a dc machine.

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

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

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Electrical Machines
Which slots are used in the rotor of an induction motor?

  None of above.
  Open slots.
  Semi closed slots.
  Closed slots.

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MORE MCQ ON Electrical Machines

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