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Electrical Machines

Electrical Machines
Transformer oil is used as

 both A and B.
 a coolant.
 an insulator.
 inert medium.

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Electrical Machines
A three phase induction motor has a synchronous speed of 1500 rpm the machine runs at 1460 rpm at a particular load. The slip at this load is ___________.

  2.67 %.
 1.5 %.
 5 %.
  30 %.

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Electrical Machines
Reactive power generated or delivered significantly depends on

 frequency.
 load angle.
 both 1 and 2.
 excitation.

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Electrical Machines
The air gap between the yoke and armature is dc machine is kept very small

All of these
 to achieve a stronger magnetic field.
 to avoid locking of the armature.
 to avoid over heating.

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Electrical Machines
Oil is provided in an oil filled transformer for

 cooling.
 lubrication.
  insulating.
  both cooling and insulation.

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Electrical Machines
Brushes are always placed on--------------- , in order to achieve sparkles commutation?

 GNA
 either GNA or MNA
None of these
 MNA

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