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Electrical Machines

Electrical Machines
Normally for the design of transformer the ambient temperature is taken as

 32°C.
 35°C.
  45°C.
 27°C.

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Electrical Machines
If the back emf in DC motor vanishes suddenly the motor will

 run at very high speed.
 burn.
 run at very low speed.
 start haunting.

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Electrical Machines
In DC generator, full form of MNA is what?

  Magnetic neutral axis.
 Magnetic neutral armature co-ordinate.
 Magnetically no-load armature co-ordinate.
 Magnetic no-load axis.

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Electrical Machines
What are the starters used for starting of cage motors?

 Star-delta starter.
 DOL starter.
 Auto transformer starter.
  All of these.

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Electrical Machines
The power factor of an induction motor operating at no load will have a value around

 unity
 0.2 lead
 0.2 lag
 0.9 lag

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Electrical Machines
In case of induction motors the ratio of length to pole pitch for minimum cost, is taken as

 1.0.
  1.5 to 2.
 2 to 3.
 3 to 5.

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MORE MCQ ON Electrical Machines

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