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Electrical Machines

Electrical Machines
Field weakening control method is used for the _________ ?

None of these
 both A and B
 above rated speed
 below rated speed

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Electrical Machines
The main purpose of providing tertiary winding in a three phase transformer is

 to interconnect three voltage systems.
None of these
  to suppress harmonic and unbalance in voltage.
 to carry extra load.

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Electrical Machines
The air gap between stator and the rotor of the 3 - φ induction motor is kept

  as small as possible.
  air gap does not matter.
  as wide as possible.
  depends on the material of stator and the rotor.

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

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

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Electrical Machines
Dynamic braking can be used for

 shunt motors.
All of these
 compound motors.
 series motors.

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Electrical Machines
What is power factor of a 3 - φ induction motor at no load?

  Low.
  Equal to 1.
  Same as full load.
  High.

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MORE MCQ ON Electrical Machines

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