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Electrical Machines

Electrical Machines
Armature resistance control method is used for the _______ ?

None of these
 above rated speed
 below rated speed
 both 1 and 2

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Electrical Machines
Crawling in an induction motor is due to

  insufficient starting torque.
  time harmonics in supply.
  slip ring rotor.
  space harmonics produced by winding currents.

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Electrical Machines
The slip of an induction motor normally does not depend on

  core loss component.
  synchronous speed.
  rotor speed.
  shaft torque.

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Electrical Machines
Open circuit test on transformer gives

 both 1and 2
 hysteresis loss
 copper loss
 eddy current loss

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Electrical Machines
In a synchronous motor hunting can be reduced to minimum possible by

  designing the motor for adequate synchronizing power.
  providing damper winding in the rotor pole faces.
  using a flywheel.
  any of above methods.

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Electrical Machines
Which motors are preferred for refrigeration and air conditioning in smaller units?

  Universal motors.
  Stepper motors.
  Reluctance motors.
  Induction motors.

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