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Electrical Machines

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

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

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Electrical Machines
Fifth harmonic component of the induced voltage in three phase AC generator can be eliminated by using a winding pitch of

 2 / 3.
  4 / 5.
 5 / 6.
 6 / 7.

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Electrical Machines
Which of the following induction motor has maximum speed?

  2 pole.
 4 pole.
 6 pole.
 8 pole.

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Electrical Machines
A voltmeter gives 120 oscillations per minute when connected to the rotor of an induction motor. The frequency is 50Hz. The slip of the motor is

 4%
 25%
 2%
 5%

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Electrical Machines
A 4 pole, 3-phase induction motor is running at 4% slip at full load. If the speed of the motor is 720 rpm, the supply frequency is

 25 Hz
 40 HZ
 60 Hz
 50 Hz

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Electrical Machines
Which of the following is minimized by laminating the core of a transformer?

 Hysteresis loss.
 Stray loss.
 Copper loss.
 Eddy current loss.

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