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Electrical Machines

Electrical Machines
What is the frequency of rotor current of 50 Hz induction motor operating at 4% slip?

 2HZ
 2.5Hz
 1 Hz
 50Hz

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Electrical Machines
The crawling in the induction motor is caused by

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

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Electrical Machines
Which of the following rotor requires damper winding?

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

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Electrical Machines
Compensating winding is placed in the

 main field
 pole shoe
 armature core
All of these

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Electrical Machines
Which of the following represents the rotating losses of machine?

 All of the them
 Hysteresis losses
 Friction and windage losses
 Eddy current losses

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Electrical Machines
The rotor winding for a 3-phase slip-ring induction motor having delta-connected stator must be connected in

  delta or star according to need.
None of these
  delta.
  star.

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MORE MCQ ON Electrical Machines

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