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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

 650 W
 625 W
 600 W
 700 W

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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

 6 / 7.
 5 / 6.
 2 / 3.
  4 / 5.

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Electrical Machines
The rotor of a 3 - Φ wound induction motor is provided with

  heavy short-circuited end rings.
  single phase winding.
  three phase winding.
  heavy copper or aluminium bars placed in rotor slots.

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Electrical Machines
Armature resistance control method is also called as-----------?

 constant voltage control
 constant torque control
 constant power control
 constant current control

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Electrical Machines
Armature reaction depends on which of the following?

 magnitude of load current
 power factor of load
 both 1 and 2
None of these

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Electrical Machines
In a synchronous machine, if the field flux axis is ahead of the armature field axis in the direction of rotation, the machine operating is

  synchronous generator.
  asynchronous motor.
  synchronous motor.
  asynchronous generator.

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MORE MCQ ON Electrical Machines

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