Question 420Electricity & Electronics - Assistant Engineer

The correct answer is D) armature current. The torque produced by a DC motor armature is the multiplication product of two factors - the density of the magnetic flux and the armature current. The density of the magnetic flux is dependent upon the field current, as stated in the question. The other multiplication factor is the armature current because the torque is directly proportional to the interaction between the magnetic field and the current flowing through the armature windings. The higher the armature current, the greater the torque produced by the motor. The other options are incorrect because they do not directly determine the torque produced by the motor. Armature resistance, voltage drop, and conductance are not the other factor that determines the torque.