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Electrical Machines

Electrical Machines
Eb/V ratio of a DC motor is an indication of

 Speed regulation.
 Running Torque.
 Starting torque.
  Effiency.

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Electrical Machines
If peak value of phase mmf is F max , then peak value of the rotating field caused by three phase is

  (3/2)Fmax.
 Fmax.
 3Fmax.
 (1/2)Fmax.

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Electrical Machines
Fufuraldehyde analysis is done to determine the

  condition of paper insulation in transformer.
 condition of cork gaskets used in transformer.
 condition of oil in transformer.
 condition of lamination on CRGO steel sheet.

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Electrical Machines
In travelling cranes for crane travel, trolley and boom hoist which motor is preferred?

  Synchronous motor.
  Slip ring induction motor.
  Stepper motor.
  DC differential compound motor.

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Electrical Machines
The crawling in the induction motor is caused by

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

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Electrical Machines
In Ward-Leonard system, the lower limit of the speed imposed by

 None of above.
 Residual magnetism of the generator.
 Field resistance.
 Armature resistance.

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MORE MCQ ON Electrical Machines

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