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Electrical Machines

Electrical Machines
The application that need frequent starting and stopping is

  paper mills.
  jaw crushers.
  blowers.
  lifts and hoists.

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Electrical Machines
Eddy current loss will depends on

All of these
 Frequency
 Flux density
 Thickness

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Electrical Machines
To get the speed of DC motor is more than normal without wastage of electrical energy _____________ is used.

  Rheostatic control.
  Ward Leonard control.
  Any of above method.
  None of above.

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Electrical Machines
The rotor slots are slightly skewed in squirrel cage induction motor to

 decrease the amount of copper to be used.
 provide ease of fabrication.
 increase the strength of rotor bars.
 reduce the magnetic hum and locking tendency of rotor.

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Electrical Machines
In escalator which motor is used?

  1 - φ IM.
  Universal motor.
  DC shunt motor.
  3 - φ IM.

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Electrical Machines
A short circuit test on a transformer gives

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

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