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Electrical Machines

Electrical Machines
A generator may loose residual magnetism due to

  heating.
  over excitation.
  vibrations.
  any of these.

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Electrical Machines
The back emf produced in a dc motor depends on

  none of these.
  Z.
  P.
  P and Z.

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Electrical Machines
If a transformer has turns ratio K, the primary and secondary current are I1 and I2 respectively and magnetizing current and core loss component of no load current Iμ and Iw respectively, then

 I1 = KI2 + Iw.
  I1 = KI2 + Iw + Iμ.ok
 I1 = KI2.
 I1 = KI2 + Iμ.

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Electrical Machines
An IM cannot run at synchronous speed because

  induction motor will become synchronous motor.
  rotor torque will not be produced.
  air friction will prevent it.
  none of above.

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Electrical Machines
The crawling in the induction motor is caused by

 high loads
 harmonics developed in the motor
 low voltage supply
 improper design of stator laminations

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Electrical Machines
What is the full form of MNP?

  Magnetic neutral plane.
  Magnetic field neutral plane.
  Magnetic neutral pole.
  Magnetic field neutral pole.

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MORE MCQ ON Electrical Machines

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