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Electrical Machines

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

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

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Electrical Machines
It is an advisable to use auto transformer if the transformation ratio is

 Greater than 1.
 near to 1.
 0.25.
 0.5.

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Electrical Machines
In DC generator, lap winding is used in

 where greater load is connected.
  high current and low voltage applications.
 where constant speed is required.
 high voltage and low current applications.

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Electrical Machines
How can the synchronous speed of a 3 - Φ IM be varied?

  By varying supply voltage.
  Both (A) and (B).
  By varying the supply frequency.
  By varying number of poles.

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Electrical Machines
A DC generator without commutator is a

 AC generator
 induction motor
 DC motor
 DC generator

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Electrical Machines
Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. The highest speed of the alternators is

  500 rpm.
  3000 rpm.
  600 rpm.
  3600 rpm.

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MORE MCQ ON Electrical Machines

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