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Electrical Machines

Electrical Machines
Commonly used starters of cage motor is

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

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Electrical Machines
The sequence of induction motor is RYB, then the direction of induction motor can be changed by which of the following sequence?

All of these
 BYR
 BRY
 RBY

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Electrical Machines
If an additional resistance is connected in series with a DC motor operating at rated speed, the speed of the motor will

  Oscillate around the normal speed.
  Remain unaltered.
  Increase.
  Reduce.

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

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

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Electrical Machines
Generators work on the principle of production of

 dynamically induced emf.
 dynamically and statically induced emf.
 statically induced emf.
None of these

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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

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

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