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Electrical Machines

Electrical Machines
If the applied voltage to a dc machine is 230 V, then the back emf, for maximum power developed, is

 200 V
 115 V
 230 V
 460 V

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Electrical Machines
The constant losses in transformer is/are

 eddy current loss.
 both 2 and 3.
 copper loss.
 hysteresis loss.

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Electrical Machines
Synchronous reactance of an alternator represents

 a reactance operating at synchronous speed
All of these
 armature reactance and leakage reactance
 field winding reactance

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Electrical Machines
A 4 pole lap wound dc generator has 4 brushes, if one of the brush is damaged, what will be the change in V, I and P ratings

 V, I and P
 V/2, I/2 and P/4
 V/2, I and P/2
 V, I/2 and P/2

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Electrical Machines
A lap wound 4 pole dc motor has 460 conductors. Find the number of parallel paths between the conductors?

  data provided is insufficient.
  2.
  4.
 6.

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Electrical Machines
The armature of DC motor is laminated

 to reduce the hysteresis loss.
 to reduce the inductor.
 to reduce the eddy current loss.
 to reduce the mass.

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