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ELECTRICAL MACHINES

Electrical Machines
The principal of starting of 3 - Φ IM is similar to

  repulsion motor type starting.
  capacitor run IM.
  transformer with short-circuited secondary.
  synchronous motor.

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Electrical Machines
3rd harmonics are eliminated in induction motor by using

  zig - zag connection.
  delta connection.
  star connection.
  V connection.

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

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

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Electrical Machines
An IM cannot run at synchronous speed because

  induction motor will become synchronous motor.
  none of above.
  rotor torque will not be produced.
  air friction will prevent it.

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Electrical Machines
How can the synchronous speed of a 3 - Φ IM be varied?

  Both (A) and (B).
  By varying number of poles.
  By varying the supply frequency.
  By varying supply voltage.

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