Question 85Electricity & Electronics - Assistant Engineer

The correct answer is D. When a compound wound DC motor is cumulatively compounded, it means that the current flow direction in each series-field coil is in the same direction as the current flow direction in its corresponding shunt-field coil. This results in the field fluxes being additive, as the two field windings produce magnetic fields that reinforce each other. This increases the overall field strength, leading to a higher starting torque and a flatter speed-torque curve compared to a series or shunt-wound motor. The other options are incorrect because they describe scenarios where the field fluxes are either subtractive (B and C) or the current flow directions are opposite (A), which is not the case for a cumulatively compounded motor.