The mechanical power developed by a shunt motor will be maximum when the ratio of back e.m.f. to applied voltage is
A)4.0
B)2.0
C)1.0
D)0.5

Question

Quizplus · Accepted Answer

The mechanical power developed by a shunt motor is maximum when the back e.m.f. is half of the applied voltage, which corresponds to a ratio of 0.5. This is because the power developed is proportional to the product of the armature current and the back e.m.f., and the armature current is maximum when the back e.m.f. is half of the applied voltage, according to the characteristics of a shunt motor.

The Mechanical Power Developed by a Shunt Motor Will Be