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Electrical Machines

Electrical Machines
Which of the following relation is correct?

 Xd > Xq.
 Xd < Xq.
 Xd = Xq.
None of these

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Electrical Machines
In a DC series generator, the terminal voltage with increase in load will

 decrease
 remain nearly constant
 increase to rated voltage and then may decrease
 increase gradually and then stay at rated voltage

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Electrical Machines
Secondary winding of an auto transformer is also called

 compensating winding.
 tertiary winding.
 damping winding.
  common winding.

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Electrical Machines
In DC machine yoke offers

 mechanical protection to the machine
 both A and B
 flux path completion
 produce working flux

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Electrical Machines
When an electric train is moving down a hill, the DC motor will operate as

 DC shunt generator.
  DC series motor.
 DC shunt motor.
  DC series generator.

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Electrical Machines
Which of the following windings are necessary in case of all dc machines?

 wave winding
 open type winding
 lap winding
 closed winding

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