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Electrical Machines

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

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

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Electrical Machines
A 4 pole 50 Hz 1-phase induction motor is running at 1470 rpm. Find the forward and backward slips?

 0.02, 1.98
 0.04, 0.96
 0.04, 1.96
 0.02, 0.98

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Electrical Machines
The mechanical power is developed by a DC motor is maximum when

 none of above.
 back emf is equal to twice of applied voltage.
 back emf is equal to applied voltage.
 back emf is equal to half of applied voltage.

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Electrical Machines
The leakage reactance of a 3-phase alternator is determined by performing

 short circuit and slip tests.
 zero power factor and slip tests.
 open circuit and zero power factor tests.
 open circuit and short circuit tests.

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Electrical Machines
The full load copper loss and iron loss of transformer are 6400W and 5000W respectively. The copper loss and iron loss at half load will be respectively?

 3200 W and 5200 W
 3200 W and 2500 W
 1600 W and 5000 W
 1600 W and 1250 W

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Electrical Machines
A frog leg winding is used in a DC machine to eliminate

 the use of compensating winding.
  the use equalizer in lap winding.
 the use drum winding.
 reactance voltage produced due to communication.

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