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Electrical Machines

Electrical Machines
At the instant of starting, the per unit slip of 3 - Φ induction motor is

  1.0.
  0.5.
  0.1.
  0.05.

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Electrical Machines
Compensating winding are used to rectify the flux density waveform at

 throughout the air gap.
None of these
  region under main pole.
 interpole region.

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Electrical Machines
which of the following type of brush and their application is/are correct

 electro graphite → large ratings
 copper graphite → low voltage high current density
 carbon brush → normal ratings
All of these

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Electrical Machines
In a dc machine 4 pole lap winding is used. The number of parallel paths are?

 4
 1
 8
 2

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Electrical Machines
An IM cannot run at synchronous speed because

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

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Electrical Machines
The fall in speed of the DC generator due to increase in load can be corrected by

  reducing the load voltage.
  increasing the input to the prime mover.
 cooling the armature.
  increasing the excitation.

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