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Electrical Machines

Electrical Machines
What will be the maximum power factor of an induction motor for dispersion coefficient of 0.05?

  0.905.
 20.
  0.05.
 1.1.

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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

 4.
  8.
 2.
 1.

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Electrical Machines
In salient pole synchronous machine, the reluctance power varies as

 sinδ
 cosδ
 sin2δ
 cos2δ

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Electrical Machines
DC generator will not build up voltage

  if it has lost residual magnetism.
 due to wrong direction of rotation.
 any one of above.
 if field resistance is more than critical resistance.

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Electrical Machines
The rotor winding for a 3-phase slip-ring induction motor having delta-connected stator must be connected in

None of these
  delta.
  delta or star according to need.
  star.

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Electrical Machines
Rotor resistance speed control is used in

 synchronous motor.
 slip ring induction motor.
 squirrel cage induction motor.
 dc shunt motor.

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