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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

 600 W
 625 W
 650 W
 700 W

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Electrical Machines
Which machine is used for battery charging?

 None of these.
 DC shunt generator.
 DC series generator.
 Compounded DC generator.

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Electrical Machines
A smaller air gap in a induction motor helps to

 increase the starting torque.
 reduce the magnetizing current.
 reduce the chance of cogging.
 reduce the chance of crawling.

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Electrical Machines
The direction of rotation of a 3 - Φ induction motor is clockwise when it is supplied with 3 - Φ sinusoidal voltage having phase sequence A - B - C. For counterclockwise rotation of motor, the phase sequence of the supply should be

 C - A - B.
 B - C - A.
  A - C - B.
 B - C - A or C - A - B.

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Electrical Machines
Which of the following motor has negative speed regulation?

 Series motor
 Differential compound motor
 Cumulative compound motors
 Shunt motor

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Electrical Machines
Which of the following motors has low ratings only?

 Capacitor run
 Shaded pole
 Resistance split phase
 Capacitor start

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