Electrical Machines
Which type motors are preferred for lathes?

 DC shunt motors.
 Squirrel Cage induction motor.
 Either A or B.
 Synchronous motor.

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Electrical Machines
Two of supply terminals to a 3 - Φ induction motor get interchanged during re-connection after normal maintenance. When switched on the supply, the motor will

  not start at all.
  get heated and damaged.
  rotate in direction opposite to that before maintenance.
  rotate in the same direction as before maintenance.

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Electrical Machines
In a DC generator, the armature reaction results in

 magnetization of leading and demagnetization of trailing pole tip.
  demagnetization of leading & magnetization of trailing pole tip.
  magnetization of inter poles.
 demagnetization of centers of poles.

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