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Electrical Machines

Electrical Machines
The commutator segments of DC machines are made up of

 copper
 brass
 hard-drawn copper
 copper alloy

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Electrical Machines
For P pole machine relation between electrical degrees and mechanical degrees is

 θelec = θmech
 θelec = 2/P*θmech
 θelec = 4/P*θmech
 θelec = P/2*θmech

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Electrical Machines
Flux density under leading pole tips in case of generator will

 either increase or decrease
 decrease
None of these
 increase

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Electrical Machines
Which of the following are variable losses?

 eddy current loss
 hysteresis loss
 shunt field copper loss
 armature copper loss

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Electrical Machines
In escalator which motor is used?

  Universal motor.
  DC shunt motor.
  3 - φ IM.
  1 - φ IM.

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Electrical Machines
The main disadvantage(s) of the ward-Leonard system is/are

 high maintenance cost.
 poor overall efficiency.
 all of above.
 high initial cost.

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