A shunt motor is fitted with a field regulator for speed control. For constant torque load, the speed will be minimum when the resistance of the regulator is

Q. A shunt motor is fitted with a field regulator for speed control. For constant torque load, the speed will be minimum when the resistance of the regulator is

A.            0Ω

B.            Infinite

C.            About 10Ω

D.            About 100Ω

Answer: 0Ω