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Electrical Machines

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

 2 to 3.
 3 to 5.
 1.0.
  1.5 to 2.

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Electrical Machines
Breather is provided in a transformer to

  absorb moisture of air during breathing.
 filter the transformer oil.
 provide cold air in transformer.
 absorb moisture from air entering in transformer.

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Electrical Machines
The power input to a 3 - φ induction motor is 60 kW and stator loss is 1 kW the rotor cu loss per phase is

  slip X 50 / 3.
  slip X 69 / 3.
 1.
  slip X 59 / 3.

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Electrical Machines
In a DC Shunt Motor the speed can be increased by

 Decreasing the field current.
 Increasing the armature current.
 Increasing the field current.
 Increasing the field current.

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Electrical Machines
Flux density under trailing pole tips in case of generator will

 either increase or decrease
 decrease
None of these
 increase

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Electrical Machines
A crusher is equipped with

 Slip ring induction motor.
 DC shunt motor.
 Synchronous motor.
 Reluctance motor.

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MORE MCQ ON Electrical Machines

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