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Electrical Machines

Electrical Machines
Slip rings of an induction motors are made of

  carbon.
  aluminium.
  stainless steel.
  phosphor bronze.

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Electrical Machines
Eg (generated emf) and Eb (back emf) both are

 changes.
 same.
 different.
 none of above.

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Electrical Machines
Secondary winding of an auto transformer is also called

  common winding.
 compensating winding.
 damping winding.
 tertiary winding.

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Electrical Machines
In a seperately excited DC Motor if field current is increased, it will

 Reduce starting torque.
 Increase acceleration duration.
 Increase speed
 Reduce armature heating.

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Electrical Machines
At what power factor, the voltage regulation of a transformer can be zero ?

 Lagging power factor.
 Unity power factor.
  Leading power factor.
 Zero power factor.

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Electrical Machines
The synchronous speed of an induction motor will be increased by

  increasing of frequency.
  increasing number of poles.
  decreasing of frequency.
  speed can not be increased.

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MORE MCQ ON Electrical Machines

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