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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
 650 W
 600 W

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Electrical Machines
Total core loss is also called as -------------?

 Hysteresis loss
 Copper loss
 Magnetic loss
 Eddy current loss

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Electrical Machines
There are two 2-pole DC machines. Main field axis of machine A is horizontal and that of B is vertical. It is preferable to purchase

 none of these
 any of the two machines
 machine B
 machine A

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Electrical Machines
Fifth harmonic component of the induced voltage in three phase AC generator can be eliminated by using a winding pitch of

  4 / 5.
 2 / 3.
 6 / 7.
 5 / 6.

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Electrical Machines
Reactive power generated or delivered significantly depends on

 frequency.
 load angle.
 both 1 and 2.
 excitation.

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Electrical Machines
When maximum starting torque is obtained, rotor power is

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