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Electrical Machines

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

 copper alloy
 hard-drawn copper
 copper
 brass

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Electrical Machines
In DC machine shape of armature MMF wave is?

 Triangular and directed towards main pole.
 Peaky in nature.
 Saddle shape.
 Triangular and directed towards brush axis.

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Electrical Machines
In an auto transformer, for what value of turn ratio, power transferred by inductively and conductively are same?

 0
 1
 any of the above
 0.5

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Electrical Machines
For larger units high torque it is preferred to use

 Slip induction motor.
 DC shunt motor.
 Partial motor.
 Universal motor.

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Electrical Machines
In alternator, the rotary part is

  magnetic field poles.
 none of these.
 armature.
 core.

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Electrical Machines
For a practical synchronous motor the pull out torque will occur when the torque angle is nearly equal to

 45°.
  75°.
 30°.
 0°.

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MORE MCQ ON Electrical Machines

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