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Electrical Machines

Electrical Machines
The wattage rating of a ceiling fan motor will be

  50 - 150 W.
 10 - 20 W.
 200 - 250 W.
 250 - 500 W.

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Electrical Machines
The frequency of voltage generated by an alternator having 8 poles and rotating at 250 rpm is

  50 Hz.
  60 Hz.
  25 Hz.
  16.67 Hz.

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Electrical Machines
For a standard frequency the machine operates at a particular speed known as

 any of the above.
 slip speed.
 synchronous speed.
 normal speed.

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

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

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Electrical Machines
The power factor of squirrel cage induction motor is

 low at heavy loads only
 both A and B
 low at rated load only
 low at light loads only

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Electrical Machines
Which of the following machine will have maximum efficiency?

 DC motor.
 Induction motor.
 Electrical power generator.
  Electrical power transformer.

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MORE MCQ ON Electrical Machines

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