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Electrical Machines

Electrical Machines
To eliminate 5th harmonic in the induced voltage phase breadth should be

 36°
 30°
 18°
 72°

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Electrical Machines
An ideal DC generated is one that has _____________ voltage regulation.

 positive.
 negative.
  zero.
 low.

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Electrical Machines
For power factor improvement the synchronous motor is to be

 heavily loaded and over excited
 heavily loaded and underexcited
 lightly loaded and underecited
 lightly loaded and over excited

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Electrical Machines
In star-delta starting of squirrel cage induction motor compared to DOL starting the starting current and torque are

 1/3, 1/√3
 1/3, 1/3
 1/√3, 1/3
 1/√3, 1/√3

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Electrical Machines
In DC generators brushes are used for

 reduce eddy current loss
 convert ac armature current in to dc
 collecting of current without any sparkings
 collecting of voltage

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Electrical Machines
The reduced air gap results in an increase

  cost of operation.
  power factor.
  breaking torque.
  starting torque.

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MORE MCQ ON Electrical Machines

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