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Electrical Machines

Electrical Machines
Which of the following is the largest conversion device?

 Induction machine
All of these
 Synchronous machine
 DC machine

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Electrical Machines
When maximum flux density is constant, the eddy current losses are proportional to

 f2
 V
 V2
 f

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Electrical Machines
In a 1-phase induction motor, if the forward torque slip is S, what is the backward torque slip?

 S
 1/S
 1-S
 2-S

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Electrical Machines
A commutator with a diameter of 50 cm rotating at 1000 rpm. For a brush width of 1.5 cm, find the time of commutation in ms.

 0.512.
 0.649.
  0.573.
 0.443.

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Electrical Machines
The frequency of voltage generated by an alternator having 8 poles and rotating at 250 rpm is

  60 Hz.
  16.67 Hz.
  50 Hz.
  25 Hz.

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Electrical Machines
In an auto-transformer, power is transferred through

 conduction process only.
 induction process only.
None of these
 both A and B.

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