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Electrical Machines

Electrical Machines
The power factor of an induction motor operating at no load will have a value around

 0.2 lag
 0.9 lag
 unity
 0.2 lead

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

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Electrical Machines
For successful parallel operation of two single phase transformers, the most essential condition is that their

 turn- ratios are exactly equal
 percentage impedances are equal
 polarities are properly connected
 KVA ratings are equal

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Electrical Machines
An IM cannot run at synchronous speed because

  air friction will prevent it.
  none of above.
  induction motor will become synchronous motor.
  rotor torque will not be produced.

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Electrical Machines
Maximum allowable tan - delta (tanδ) of dielectric dispassion factor of power transformer insulating oil is generally taken as

 2 at 90°C.
  1 at 90°C.
 3 at 90°C.
 0.5 at 90°C.

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Electrical Machines
With the increases in field excitation of a DC generator, its generated emf

  decreases.
  increases upto a limit and then remains almost constant.
  remains constant.
 increases.

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