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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

 700 W
 625 W
 600 W
 650 W

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Electrical Machines
If the flux of DC motor approaches zero, its speed will

 approach zero.
 aprroach infinity.
 between zero and infinity.
 remain unchanged.

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Electrical Machines
Which of the following induction motor has the highest starting torque?

 Slip ring induction motor.
 Same in both induction motors.
None of these
 Squirrel cage induction motor.

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Electrical Machines
The armature of DC motor is laminated

 to reduce the mass.
 to reduce the inductor.
 to reduce the hysteresis loss.
 to reduce the eddy current loss.

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Electrical Machines
The teeth in the armature of a DC machines are sometimes skewed. This is done to reduce

 copper loss.
 hysteresis loss.
 eddy electric current loss.
 vibrations.

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

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

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