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Electrical Machines

Electrical Machines
In an induction motor, air gap power is 10 Kw and mechanically developed power is 8 Kw. What are the rotor ohmic losses?

 1.5KW
 2KW
 3KW
 0.5Kw

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Electrical Machines
For the above problem, find the induced voltage of an alternator of it is to deliver a load of 100 A at power factor of 0.8 lagging with terminal voltage of 200 V.

 225 V.
  222 V.
 220 V.
 230 V.

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Electrical Machines
The sparking at the the brushes, in a DC machines is due to

 presence of commutator.
 armature reaction.
 high resistance of carbon brushes.
  reactance voltage.

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Electrical Machines
During no load test, an induction motor draws power

  for core loss and copper loss.
  only for the small copper loss.
  for core loss and windage and friction loss.
  for copper loss and windage friction loss.

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Electrical Machines
A synchronous machine has P number of poles, find the relation between electrical angular momentum (ωe) and mechanical angular momentum (ωm)?

 ωe = P*ωm
 ωe = ωm
 ωe = 2/P*ωm
 ωe = P/2*ωm

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Electrical Machines
The constant losses in transformer is/are

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

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