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Electrical Machines

Electrical Machines
The torque speed characteristics of a AC servomotor is approximately

 hyperbola
 linearised
 parabola
 any of the above

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Electrical Machines
Swinburne test is conducted under which of the following condition?

 any of the above
 no load
 full load
 half load

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Electrical Machines
The magnetic field which initially induces emf in the armature in a self excited DC generator is because of

  residual magnetism.
 armature reaction.
None of these
  permanent magnets.

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Electrical Machines
If dimension of all the parts of a synchorous generator and the number of field and armature turns are double, then generated voltage will change by a factor of

  8.
 2.
 1.
 4.

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

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

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Electrical Machines
The speed of stator rotating magnetic field (RMF) with respect to rotor is

 Ns
 Nr
 Zero
 S.Ns

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MORE MCQ ON Electrical Machines

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