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Electrical Machines

Electrical Machines
A 3 - Φ, 4 pole, 50 Hz induction motor 4 % slip, calculate frequency of the rotor emf?

  3 Hz.
  2 Hz.
 10 Hz.
 50 Hz.

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Electrical Machines
In IM the rotor lamination can be ________________ than stator laminations.

  thicker.
  sipper.
  thinner.
  rotor can not have any laminations.

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Electrical Machines
Hunting in a synchronous motor takes place

  when power factor is unity.
  motor is under loaded.
  when supply voltage fluctuates.
  when load varies.

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Electrical Machines
For same HP rating and full load speed which of following motor has poor starting torque?

 Shunt.
 Differently compounded.
 Series.
 Cummulative compound.

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Electrical Machines
Essential conditions for two DC generators are connecting for parallel operation is/are

 terminal voltage should be same.
 polarities should be same.
 both A and B.
 rating of generators should be same.

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Electrical Machines
The heat generated in the transformer is dissipated mainly by

 radiation.
  convection.
All of these
 conduction.

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MORE MCQ ON Electrical Machines

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