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Electrical Machines

Electrical Machines
An induction motor has synchronous speed of 1500 rpm. What will be the slip when it is running at a speed of 1450 rpm?

 -3.33%
 +3.33%
 +3%
 -3%

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Electrical Machines
Total core loss is also called as -------------?

 Magnetic loss
 Eddy current loss
 Copper loss
 Hysteresis loss

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Electrical Machines
If the excitation of the synchronous generator fails, it acts as a/an

  induction generator.
 induction motor.
 synchronous generator.
 synchronous motor.

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Electrical Machines
Value of specific electric loading of Induction motor is in the range of

  400 - 4000 ampere conductor / metre.
 30000 - 100000 ampere conductor / metre.
  5000 - 45000 ampere conductor / metre.
 40 - 400 ampere conductor / metre.

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Electrical Machines
Series field consists of--------number of turns and ---------- conductors respectively

 less and thin
 large and thick
 less and thick
 large and thin

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Electrical Machines
Iron loss in a transformer mainly occurs in

 steel core in transformer.
 iron made tank of transformer.
 transformer insulating oil.
 winding of transformer.

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