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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%
 57.7%
 33.3%

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Electrical Machines
In induction motors, there is large decrease in maximum power factor when the dispersion coefficient is ________________.

 remains same.
  increased.
 decreased.
 kept constant to certain value.

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Electrical Machines
For successful parallel operation of two single phase transformers, the most essential condition is that their

 polarities are properly connected
 KVA ratings are equal
 turn- ratios are exactly equal
 percentage impedances are equal

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Electrical Machines
Which single phase motor is used for a refrigerator?

  Split phase.
  Capacitor run.
  Repulsion.
  Universal.

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Electrical Machines
In a synchronous machine, if the field flux axis is ahead of the armature field axis in the direction of rotation, the machine operating is

  synchronous generator.
  asynchronous generator.
  synchronous motor.
  asynchronous motor.

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Electrical Machines
A DC cumulatively compounded motor delivers rated load torque at rated speed. If the series field is short-circuited, then the armature current and speed will

 both decrease
 decrease and increase respectively
 both increase
 increase and decrease respectively

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