Electrical Machines
For a given torque, reducing divertor resistance of a DC series motor

  Increase in speed but armature currnet remains the same.
  Decrease in speed but armature current remains the same.
  Increase in speed demanding more armature current.
  Decrease in speed demanding less armature current.

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

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

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