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.
 Both of above.
 Heavy sparking at brushes.

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Electrical Machines
In case of a DC Shunt motor if the load is decreased to some extent, what will happen to its speed?

 The speed will remains almost constant.
 The speed will increase abruptly.
 The speed will increase in proportion to reduction in load.
 The speed will increase gradually.

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