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

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

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Electrical Machines
In a DC shunt generator working on load, the brushes are moved forward in the direction of rotation, as a result of this, commutation will

  worsen and terminal voltage will fall
  improve and terminal voltage will rise .
 improve but terminal voltage will fall.
  worsen and terminal voltage will rise.

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