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Electrical Machines

Electrical Machines
Universal motor have which of the following application?

  Food mixer.
  Lift.
  Domestic pump.
  Traction.

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

 f²
 V
 V²
 f

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Electrical Machines
Speed of DC motor can be controlled by varying

 all of these.
 resistance of armature culture.
 its flux oer pole.
 applied voltage.

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Electrical Machines
Which one of the following statement is correct ? In an induction motor if the air gap is increased then

 its speed will reduce
 its power factor will reduce
 its efficiency will improve
 its speed will increase

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Electrical Machines
In a dc machine 4 pole lap winding is used. The number of parallel paths are?

 1
 2
 4
 8

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

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

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