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Electrical Machines

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

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

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Electrical Machines
The use of higher flux density in the transformer design

None of these
 reduces the weigh per KVA
 increases the weigh per KVA
 has no relation with the weight of transformer

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Electrical Machines
The rotor slots are slightly skewed in squirrel cage induction motor to

 increase the strength of rotor bars.
 decrease the amount of copper to be used.
 provide ease of fabrication.
 reduce the magnetic hum and locking tendency of rotor.

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Electrical Machines
Saving of copper in auto transformer is increased as compared to two winding transformer, when transformation ratio K approaches to

 zero.
 infinity.
  unity.
 two.

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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

 40 HZ
 25 Hz
 60 Hz
 50 Hz

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Electrical Machines
A DC series motor is running with a divertor connected across its field winding. If the divertor resistance is reduced then the speed of the motor will

 remain unaltered.
 become execessively high.
 increase.
 decrease.

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MORE MCQ ON Electrical Machines

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