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Electrical Machines

Electrical Machines
If the field current is reduced to zero the maximum power developed by alternator is

 5.46 KW.
 0.9103 KW.
  2.73 KW.
 1.644 KW.

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Electrical Machines
Eg (generated emf) and Eb (back emf) both are

 none of above.
 different.
 changes.
 same.

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Electrical Machines
The condition for maximum running torque is

 0.5 lagging
 unity
 zero
 0.707 lagging
 R = S.X

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Electrical Machines
The short circuit test on a transformer is conducted to obtain

 hysteresis loss.
  copper losses.
 eddy current loss.
 core loses only.

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Electrical Machines
The air gap between stator and the rotor of the 3 - φ induction motor is kept

  depends on the material of stator and the rotor.
  as small as possible.
  as wide as possible.
  air gap does not matter.

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Electrical Machines
If field current is decreased in shunt dc motor, the speed of the motor

 decreases.
 remains same.
None of these
 increases.

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MORE MCQ ON Electrical Machines

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