Electrical Machines
With the increase in speed of a DC motor

 back emf increases but line current falls.
 both back emf as well as line current fall.
 both back emf as well as line current increase.
 back emf falls and line current increases.

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

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