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Electrical Machines

Electrical Machines
When flux density is constant in a transformer, hysteresis loss varies as

 f
 V
 f²
 V²

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Electrical Machines
The flux is maximum in the following part of a DC motor:

 pole core.
 under leading pole tip.
 under the interpole.
 under trailing pole tip.

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

 35°C.
 32°C.
  45°C.
 27°C.

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Electrical Machines
Dummy coils are used for

 increasing efficiency.
 reducing armature reaction.
 mechanical balancing.
All of these

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Electrical Machines
What is the phase difference between two windings of A.C servomotor ?

 30°.
 60°.
 90°.
 120°.

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Electrical Machines
The slip of an induction motor normally does not depend on

  core loss component.
  rotor speed.
  synchronous speed.
  shaft torque.

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MORE MCQ ON Electrical Machines

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