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Electrical Machines

Electrical Machines
Regenerative braking is not found in which motor?

  DC series.
 DC shunt.
 DC compound.
 Induction motor.

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Electrical Machines
Synchronising power of a synchronous motor varies

 directly as Xs2
All of these
 directly as synchronous reactances Xs
 inversely as 1/Xs

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Electrical Machines
Which of following winding is connected in series with armature winding of DC machine?

 Commutating pole winding.
 Compensating winding.
 Auxiliary winding.
 Both Compensating and Commutating pole winding.

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Electrical Machines
Variation in speed by ward-Leonard control of DC motors occurs due to variation in

  Field excitaion.
  Supply voltage.
  Armature current.
  Armature voltage.

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Electrical Machines
When applied rated voltage per phase is reduce to one half, the starting torque of three phase squirrel cage induction motor becomes

 1/4 of the intial value
 1/2 of the initial value
 4 time the initial value
 twice the initial value

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

None of these
 increase
 either increase or decrease
 decrease

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