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Electrical Machines

Electrical Machines
In a transformer maximum flux density is not constant, the eddy current loss varies as

 V
 f²
 f
 V²

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Electrical Machines
The maximum power developed in cylindrical synchronous machine is occurs at a load angle of

 90o.
 0o.
 less than 90o.
 Greater than 90o.

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Electrical Machines
The leakage reactance of a 3-phase alternator is determined by performing

 zero power factor and slip tests.
 open circuit and zero power factor tests.
 short circuit and slip tests.
 open circuit and short circuit tests.

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Electrical Machines
The principle of operation of a 3 - Φ induction motor is almost similar to that of

  transformer with secondary short circuited.
  capacitor start induction motor.
  synchronous motor.
  repulsion start induction motor.

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Electrical Machines
In double cage induction motor, the inner cage offers

  high resistance and high reactance.
  high resistance and low reactance.
  low resistance and low reactance.
  low resistance and high reactance.

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Electrical Machines
The teeth in the armature of a DC machines are sometimes skewed. This is done to reduce

 copper loss.
 eddy electric current loss.
 vibrations.
 hysteresis loss.

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MORE MCQ ON Electrical Machines

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