Electrical Machines
DC motors are stopped by opening line switches and not by forcing the handle of the motor starter back to OFF position. This is due to occurance of

 None of these.
 Heavy sparking at brushes.
 Heavy sparking at the first stud of starting resistance steps.
 Both of above.

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

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