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Electrical Machines

Electrical Machines
The breakdown torque of a synchronous motor varies as

 1/V²
 1/V
 V²
 applied voltage V

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Electrical Machines
In most condition which frame of motor will be preferred?

 Open type.
 Splash proof.
  Totally enclosed fan coiled.
 Drip proof.

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Electrical Machines
To have sparkless commutation, the armature reaction effect in a DC machine is neutralized by

 shifting the brush axis from GNA to MNA.
 increasing field excitation.
  compensating winding and commutating poles.
 fixing the brush axis inline with the pole axis.

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Electrical Machines
The stator frame in an induction motor is used to

  protect the whole machine.
  ventilate the armature.
  hold armature stamping in position.
  provide return path for the flux.

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Electrical Machines
If the air gap of IM is increased, ____________ will increase.

  magnetizing current.
  speed.
  power factor.
  air gap flux.

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Electrical Machines
Which of following DC generator will be in a position to build up without any residual magnetism in the field?

  Compound.
 Shunt.
  Separately excited.
  Series.

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MORE MCQ ON Electrical Machines

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