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Electrical Machines

Electrical Machines
Commonly used starters of cage motor is

None of these
  DOL.
  both A and B.
  star delta.

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Electrical Machines
What is the full form of MNP?

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

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Electrical Machines
The armature core of a DC machine is laminated to minimise

 temperature rise
 hysteresis loss
 mechanical loss
 eddy-current loss

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Electrical Machines
Which of the following rotor requires damper winding?

 Salient pole rotor.
 Both type rotor.
None of these
 Cylindrical rotor.

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Electrical Machines
Satisfactory commutation of DC machine requires

 smooth, concentric commutator properly undercut.
All of these
 brushes should smoothly run in the holders.
 brushes should be of proper grade and size.

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Electrical Machines
The shaft torque of a dc motor is less than the electromagnetic torque because of

  hysteresis losses.
  eddy current losses.
  ohmic losses.
  mechanical losses.

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MORE MCQ ON Electrical Machines

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