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Electrical Machines

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

 leading.
 unity.
 zero.
  lagging.

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Electrical Machines
Eb/V ratio of a DC motor is an indication of

 Running Torque.
  Effiency.
 Starting torque.
 Speed regulation.

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Electrical Machines
In a synchronous motor, damper windings are provided on

  rotor shaft.
None of these
  stator frame.
  pole faces.

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Electrical Machines
A short-shunt cumulatively-compounded dc generator builds up a voltage of 220 V at no load at rated speed. If it is operated as a differentially compounded generator, other things remaining the same, it would build up

 more than 220 V
 220 V
 somewhat less than 220 V
 6 V

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Electrical Machines
In an induction motor, what is the ratio of rotor input to rotor copper loss?

 1/(1-S)
 1/S
 1-S
 S

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Electrical Machines
Which of following DC generator will be in a position to build up without any residual magnetism in the field?

 Shunt.
  Compound.
  Series.
  Separately excited.

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MORE MCQ ON Electrical Machines

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