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Electrical Machines

Electrical Machines
For the purpose of starting an induction motor, star/delta switch is an equivalent to auto transformer of ratio

 66.3%
 50%
 33.3%
 57.7%

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Electrical Machines
Iron loss in a transformer mainly occurs in

 steel core in transformer.
 transformer insulating oil.
 iron made tank of transformer.
 winding of transformer.

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Electrical Machines
The dc motor which can provide zero speed regulation at full load without any controller, is

 series.
 shunt.
 cumulative compound.
 differential compound.

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Electrical Machines
To control the speed of an induction motor, the supply frequency is reduced by 10%. For the same magnetizing current to remain constant, the supply voltage must be

 reduced by 10%
 increased by 10%
 reduced by 20%
 increased by 20%

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Electrical Machines
The 3 - Φ induction motor with rotor circuit open will

  not run.
  make noise.
  get over heated.
  run normally.

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Electrical Machines
In 3 - Φ induction motor some times copper bars are placed deep in the rotor to

  reduce copper loss.
  improve starting torque.
  improve efficiency.
  improve power factor.

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MORE MCQ ON Electrical Machines

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