Electrical Machines
Which DC motor will have least percentage increase of input current, for the same percentage increase in the torque

 Separately Excited DC Motor
 DC Shunt Motor
 Compound Wound DC Motor
 DC Series Motor

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

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