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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?

 2KW
 1.5KW
 0.5Kw
 3KW

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Electrical Machines
Which of the following bearings and their uses are correct

 neither 1 nor 2
 ball bearings → small machines
 both A and B
 roller bearings → large machines

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Electrical Machines
A DC series motor is running at rated speed without any additional resistance in series. If an additional resistance is placedin series, the speed of motor

 Increases.
 Remains unchanged.
  Decreases.
 Oscillates around the rated speed.

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Electrical Machines
In DC generator, full form of MNA is what?

 Magnetically no-load armature co-ordinate.
 Magnetic no-load axis.
  Magnetic neutral axis.
 Magnetic neutral armature co-ordinate.

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Electrical Machines
If the excitation is critical, the power factor of the alternator is

 lagging power factor.
None of these
 unity power factor.
 leading power factor.

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Electrical Machines
A DC generator can be considered as

 rotating amplifier.
 rectifier.
 power pump.
 prime mover.

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