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Electrical Machines

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

 sin2δ
 cos2δ
 sinδ
 cosδ

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Electrical Machines
In case of a conductively compensated DC series motor, the compensating winding is provided

 In parallel with the field winding.
 In parallel with the armature winding.
  In series with the armature winding.
 As a separate unit.

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Electrical Machines
The speed of a 3-phase induction motor operating in its stable region

 decreases with decrease in the load torque.
 decreases with increase in the load torque.
 increases with increase in the load torque.
 remains constant.

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Electrical Machines
In a synchronous motor electromagnetic power varies

 inversely as applied voltage
 directly as square of applied voltage
 directly as applied voltage
None of these

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Electrical Machines
The heat generated in the transformer is dissipated mainly by

All of these
 conduction.
 radiation.
  convection.

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Electrical Machines
What is power factor of a 3 - φ induction motor at no load?

  Same as full load.
  Equal to 1.
  Low.
  High.

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MORE MCQ ON Electrical Machines

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