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Electrical Machines

Electrical Machines
Find the number of poles required, when the frequency is 50Hz and speed of the motor is 500 rpm?

 10
 24
 5
 12

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Electrical Machines
What is the full form of MNP?

  Magnetic neutral pole.
  Magnetic field neutral plane.
  Magnetic neutral plane.
  Magnetic field neutral pole.

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Electrical Machines
Which of the following is not a part of transformer?

 Conservator tank.
  Commutator.
 Radiator.
 Tap changer.

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Electrical Machines
If the mechanical angle α between the stator and rotor poles increases, then the stator current

 Remains unchanged.
 Decreases.
  Increases.
 None of above.

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Electrical Machines
The self induced emf in the coil undergoing commutation is called the

  dynamically induced voltage.
  statically induced voltage.
  reactance voltage.
None of these

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Electrical Machines
An ideal DC generated is one that has _____________ voltage regulation.

 low.
  zero.
 positive.
 negative.

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