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Electrical Machines

Electrical Machines
Which of the following induction motor has maximum speed?

 6 pole.
 8 pole.
 4 pole.
  2 pole.

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Electrical Machines
The armature core of the rotor bars of dc motors are laminated

  to provide better flux linkage.
  to reduce eddy current loss.
  to reduce hysteresis loss.
  to reduce mechanical losses.

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Electrical Machines
Silicon content in steel lamination is kept within 5% as it

 makes the material brittle.
All of these
 Increases cost.
 increases hysteresis loss.

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Electrical Machines
In DC generators, the residual magnetism is of the order of

  2.5 %.
  20 %.
 10 %.
  15 %.

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Electrical Machines
When pure inductive load is connected to the alternator, what is the effect of armature reaction?

 Demagnetization
 Cross magnetization
None of these
 Magnetization

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Electrical Machines
The current drawn by the armature of DC motor is directly proportional to

 None of above.
 The voltage across the terminals.
 The speed of motor.
 The torque required.

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