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Electrical Machines

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

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

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Electrical Machines
When a DC cummulative compound wound motor is loaded

 Torque and speed both increase.
 Torque decrease and speed increases.
  Torque increase and speed decrease.
 Both torque and speed decrease.

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Electrical Machines
When excitation is increased (over excitation), the synchronous generator operates at

 leading power factor.
 lagging power factor.
 unity power factor.
 any of the above.

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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

 112.5 W
 168.75 W
 75 W
 50 W

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Electrical Machines
Stepper motor is used in

 food processing
 computer printers
All of these
 traction

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

  Universal.
  Repulsion.
  Capacitor run.
  Split phase.

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MORE MCQ ON Electrical Machines

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