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.
  Increase.
  Remain unaltered.
  Reduce.

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Electrical Machines
An alternator is feeding an infinite busbar. Its prime mover is suddenly shutdown. The alternator will

 start working as induction motor.
 continue to work as alternator but the direction of rotation will reverse.
 continue to work as synchronous motor with same direction of rotation.
 come to stand still.

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