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Electrical Machines

Electrical Machines
The rotor power output of 3-phase induction motor is 15 KW. The rotor copper losses at a slip of 4% will be

 625 W
 650 W
 600 W
 700 W

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Electrical Machines
To control the speed of an induction motor, the supply frequency is reduced by 10%. For the same magnetizing current to remain constant, the supply voltage must be

 increased by 10%
 reduced by 10%
 increased by 20%
 reduced by 20%

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Electrical Machines
stepped cores are used in transformers in order to reduce

 volume of copper.
 reluctance of core.
 iron loss.
 volume of iron.

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

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

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Electrical Machines
If starter is not used with large DC motor for starting, it will

 all of above.
 draw a starting current many times its rated full load current.
 damage the armature and commutator.
 provide execessive voltage drop in line.

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Electrical Machines
In dc motors, under leading pole tips flux density will--------?

 either increase or decrease
 increase
None of these
 decrease

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