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Electrical Machines

Electrical Machines
The sequence of induction motor is RYB, then the direction of induction motor can be changed by which of the following sequence?

 BRY
 BYR
 RBY
All of these

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Electrical Machines
Rotating magnetic field is produced in an induction motor because of

  either stator winding or rotor winding.
  rotor winding.
None of these
  stator winding.

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Electrical Machines
A short circuit test on a transformer gives

 copper loss at over load.
 copper loss at half load.
  copper loss at any load.
 copper loss at full load.

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Electrical Machines
The interpoles in dc machines have a tapering shape in order to

 reduce the overall weight
 economise on the material required for interpoles and their windings
 increase the acceleration of commutation
 reduce the saturation in the interpole

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Electrical Machines
Which of the following motor is used in grinders?

  Synchronous motor.
  Capacitor start IM.
  Split phase IM.
  Capacitor start capacitor run IM.

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Electrical Machines
Variation in speed by ward-Leonard control of DC motors occurs due to variation in

  Field excitaion.
  Armature voltage.
  Supply voltage.
  Armature current.

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