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Electrical Machines

Electrical Machines
Larger values of air flux density is taken while designing IM for

  both.
  larger output.
  none.
  larger bore diameter.

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Electrical Machines
Which of the following motor has more stability

 both motors has same stability
None of these
 cylindrical motor
 salient pole motor

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

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

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Electrical Machines
A 100/10, 50 VA double winding transformer is converted to 100/110 V auto transformer. The rating of auto transformer is

 500 VA
 550 VA
 100 VA
 110 VA

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Electrical Machines
In dc motors, under leading pole tips flux density will--------?

 decrease
None of these
 either increase or decrease
 increase

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Electrical Machines
In a synchronous machine, if the field flux axis is ahead of the armature field axis in the direction of rotation, the machine operating is

  asynchronous generator.
  synchronous motor.
  synchronous generator.
  asynchronous motor.

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