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Electrical Machines

Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. The frequency of rotor current is

 1 Hz
 5 Hz
 50 Hz
 0 Hz

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Electrical Machines
In a single phase induction motor driving a fan load, the reason for having a high resistance rotor is to achieve

  quick acceleration.
 reduced size.
 high efficiency.
 low starting torque.

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Electrical Machines
If the field connection of a DC Shunt Motor is changed then

 it will run in same direction.
 motor will not run.
 it will run in opposite direction.
 it will run in same direction by slowly.

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Electrical Machines
In DC generators, the residual magnetism is of the order of

  15 %.
  20 %.
  2.5 %.
 10 %.

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Electrical Machines
The slip of an induction motor normally does not depend on which of the following?

 Synchronous speed.
 Rotor speed.
 Shaft torque.
  Core loss component.

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Electrical Machines
In shapers and slotters which motor are preferred?

  Slip ring IM.
  Squirrel cage IM.
  Synchronous motor.
  Double cage motor.

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MORE MCQ ON Electrical Machines

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