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Electrical Machines

Electrical Machines
In DC machine torque is proportional to which of the following?

 flux(φ)
None of these
 both A and B
 armature current(Ia)

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Electrical Machines
A single phase transformer when supplied from 220 V, 50 Hz has eddy current loss of 50 W. If the transformer is connected voltage of 330 V, 75 Hz, the eddy current loss will be

 50 W
 112.5 W
 168.75 W
 75 W

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Electrical Machines
It is an advisable to use auto transformer if the transformation ratio is

 0.5.
 near to 1.
 0.25.
 Greater than 1.

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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

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

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Electrical Machines
In a transformer which of the following losses are zero?

 Iron loss
 Copper loss
 Rotational loss
All of these

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Electrical Machines
A DC series motor is running at rated speed without any additional resistance in series. If an additional resistance is placedin series, the speed of motor

  Decreases.
 Increases.
 Oscillates around the rated speed.
 Remains unchanged.

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