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

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

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Electrical Machines
For a single phase capacitor start induction motor which of the following is valid?

  Rotation can be changed by reversing main winding terminals.
 Rotation can be changed by interchanging supply terminals.
 None of these.
 Direction of rotation cannot be changed.

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