As shown in figure "B" of the illustration, when the DC motor in figure "A" is operating at base speed what are the armature and field characteristics? Illustration EL-0153

Correct Answer: Option A — The motor is operating at maximum armature voltage and maximum field current.

Base speed in a DC motor is defined as the speed achieved when the armature is supplied with rated voltage and the field is supplied with rated (maximum) current. Operating at these parameters ensures the motor produces its rated torque and power output without exceeding thermal or electrical design limits.