In a D.C. series motor, if the armature current is reduced by 50%, the torque of the motor will be equal to
A)100% of the previous value
B)50% of the previous value
C)25% of the previous value
D)10% of the previous value

Question

Quizplus · Accepted Answer

The torque in a DC series motor is directly proportional to the square of the armature current (T ∝ I^2). Therefore, if the armature current is reduced by 50%, the torque will be reduced to 25% of its previous value.

In a DC Series Motor, If the Armature Current Is Reduced by Reduced