Q. A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 Ω and the field winding resistance is 80 Ω. The external resistance to be added in the armature circuit to limit the armature current to 125% of its rated value is
A. 31.9 Ω
B. 31.1 Ω
C. 15.9 Ω
D. 15.1 Ω
Answer: 31.1Ω
