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Electrical Machines

Electrical Machines
Flux density under trailing pole tips in case of generator will

 decrease
None of these
 either increase or decrease
 increase

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Electrical Machines
A 4 pole DC generator rotates at 1500 rpm. How many times in a second, will the emf induced in each armature conductor changes its direction?

 750.
  100.
 500.
 200.

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Electrical Machines
Air core transformer as compared to iron core transformer, has

  more copper loss.
 more magnetic core loss.
 less magnetic core loss.
  no magnetic core loss.

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Electrical Machines
Field weakening control method is used for the _________ ?

 above rated speed
 both A and B
None of these
 below rated speed

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Electrical Machines
In Ward-Leonard system, the lower limit of the speed imposed by

 Field resistance.
 Armature resistance.
 None of above.
 Residual magnetism of the generator.

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Electrical Machines
What happens if fifth multiples of harmonics is given to induction motor?

  Either short circuit or open circuit occurs.
  Fail to start.
  It will rotates in normal operation.
  It will rotates in reverse direction.

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