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Electrical Machines

Electrical Machines
When a transformer is loaded, the secondary terminal voltage drops. That means power factor is

  lagging.
 zero.
 leading.
 unity.

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Electrical Machines
What is the increase in the torque expressed as percentage of initial torque, if current drawn by the dc series motor is increased from 10A to 11A?

 41%
 11%
 10%
 21%

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Electrical Machines
A synchronous motor will deliver maximum power when

  input power factor is unity.
  load angle is equal to internal angle θ.
  load angle is 45°.
  load angle is 0°.

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Electrical Machines
In induction motor when the length of the air gap is increased, the magnetizing current of the motor increases while the short circuit current __________________.

 decreased.
  remains unchanged.
 increased.
 kept constant to certain value.

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Electrical Machines
In an alternator the voltage generated per phase is proportional to

  frequency of waveform.
  number of turns in coil.
  flux per pole.
All of these

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Electrical Machines
The slip of an induction motor normally does not depend on

  shaft torque.
  synchronous speed.
  rotor speed.
  core loss component.

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MORE MCQ ON Electrical Machines

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