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Electrical Machines

Electrical Machines
The no load current in a transformer lags the applied voltage by

 90°.
 0°.
 about 115°.
  about 75°.

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Electrical Machines
A DC series motor drawing an armature current of Ia is operating under saturated magnetic conditions. The torque developed in the motor is proportional to

 1/Ia
 Ia
 I/Ia2
 Ia2

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Electrical Machines
A commutator in dc machine provide ----------------- rectification?

 full wave
 full wave controlled
 half wave controlled
 half wave

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Electrical Machines
The size of inter poles is small as compared to main poles. What is the reason?

 In order to not to get saturated.
All of these
 In order to get more flux.
 In order to get saturated.

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Electrical Machines
In shaded pole induction motors, the flux moves from ------------- region to ----------------- region respectively?

 shaded, unshaded
 unshaded, shaded
 shaded, shaded
 unshaded, unshaded

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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.
None of these
 armature reaction.
  permanent magnets.

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MORE MCQ ON Electrical Machines

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