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Electrical Machines

Electrical Machines
The current drawn by a DC motor at the time of starting is

 Zero.
 Normal.
 Very low.
 Very high.

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Electrical Machines
In a transformer operating at constant voltage if the input frequency increases, the core loss

 remains constant.
 increase.
None of these
 decrease.

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Electrical Machines
The armature of a DC motor is laminated to reduce

 eddy current loss.
 hysteresis loss.
 friction and windage loss.
 copper loss.

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Electrical Machines
What is the full form of MNP?

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

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Electrical Machines
Current in a coil undergoing commutation is not able to get reversed completely by the end of commutation period. It is due to

None of these
  coil resistance.
  reactance voltage induced in the coil.
 armature emf.

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Electrical Machines
If the full load speed of 3-phase, 50Hz induction motor is 950 rpm, what is its half load speed nearly equals to?

 975 rpm
 940 rpm
 950 rpm
 1000 rpm

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