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Electrical Machines

Electrical Machines
Oil is provided in an oil filled transformer for

 cooling.
  both cooling and insulation.
  insulating.
 lubrication.

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

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

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Electrical Machines
When pure inductive load is connected to the alternator, what is the effect of armature reaction?

 Cross magnetization
None of these
 Demagnetization
 Magnetization

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Electrical Machines
For a DC machine having P no of pole pairs Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance for lap-winding ?

 PZL/4Sa²
 PZL/ 4Sa
 PZL/4SP²
 PZL/4S

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Electrical Machines
Find the reactance voltage when current is changed from -2A to 2A in 4 sec and self inductance is 1H?

 4 V
 1 V
 0 V
 2 V

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

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

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