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Electrical Machines

Electrical Machines
The output power of any electrical motor is taken from the

 Motor frame.
 Coupling mounted on the shaft.
 Field.
 Armature.

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Electrical Machines
The sparking at the the brushes, in a DC machines is due to

 armature reaction.
  reactance voltage.
 high resistance of carbon brushes.
 presence of commutator.

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Electrical Machines
In DC generator, armature reaction refers to what?

 Effect of armature flux on the load.
  Effect of armature flux on the main field flux.
None of these
 Effect of field flux on the armature flux.

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Electrical Machines
What is the full form of MNP?

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

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Electrical Machines
A DC cumulatively compounded motor delivers rated load torque at rated speed. If the series field is short-circuited, then the armature current and speed will

 both increase
 decrease and increase respectively
 both decrease
 increase and decrease respectively

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Electrical Machines
In a DC generator in case the brushes are moved so as to bring them in magnetic neutral axis, then, there will be

 demagnetisation.
  cross-magnetisation.
  cross-magnetization as well as demagnetization.
  none of above.

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