Electrical Machines
A dc shunt generator, when driven without any excitation, showed an open circuit voltage of 12 V. When the field winding was excited, the voltage dropped to zero. It happened because

 field winding was wrongly connected
 there was no residual magnetism in the field circuit
 field resistance was higher than critical resistance
 there was a break in the armature circuit

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

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