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Electrical Machines

Electrical Machines
Hysteresis loop represents the area of

 eddy current loss
 total iron losses
 copper loss
 hysteresis loss

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Electrical Machines
Neglecting all losses, the developed torque (T) of DC separately excited motor, operating under constant terminal voltage is reduced to its output power (P) as

 T ∝ √P.
 T is independent of P.
 T ∝ P.
 T2 ∝ P3.

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Electrical Machines
Transformer action requires a

 alternating electric flux.
 constant magnetic flux.
 alternating magnetic lux.
 increasing magnetic flux.

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Electrical Machines
Which of the following statements are correct ?

None of these
 A small value of leakage reactance will increase the maximum power output of motor.
 The leakage reactance of the induction motor should be small.
 Both 1 and 2.

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

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

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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

 650 W
 700 W
 625 W
 600 W

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