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Electrical Machines

Electrical Machines
The heat generated in the transformer is dissipated mainly by

 radiation.
All of these
 conduction.
  convection.

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Electrical Machines
Armature of DC machine is made of

 insulating material.
 non-ferrous material.
 conducting material.
 silicon steel.

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Electrical Machines
In a 3-phase induction motor, torque and supply voltage are related as

 T ∝ 1/V
 T ∝ 1/V²
 T∝ V²
 T ∝ V

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Electrical Machines
In induction motor the 7th harmonic torque may make the motor rotate at (1 / 7)th synchronous speed. This is called

  resonance.
  cogging.
  harmonics.
  crawling.

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Electrical Machines
_____________ types of induction motor are widely used.

  Squirrel cage IM.
  Slip ring IM.
  Three phase IM.
  Single phase IM.

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

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

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MORE MCQ ON Electrical Machines

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