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ELECTRICAL MACHINES

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

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

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

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

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

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

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Electrical Machines
An IM cannot run at synchronous speed because

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

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

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

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