Question 25Electricity & Electronics - 1st Asst/Chief

The correct answer is A) The motor is operating at maximum armature voltage and maximum field current. When a DC motor is operating at its base speed, it is running at the maximum armature voltage and maximum field current. This allows the motor to produce the maximum torque and power output at that speed. The field current is at its maximum to create the strongest magnetic field, while the armature voltage is also at its maximum to provide the necessary current and voltage for the motor to operate at its base speed. The other options are incorrect because they do not accurately describe the armature and field characteristics of a DC motor operating at its base speed. Options B, C, and D all describe scenarios where either the armature voltage or field current are not at their maximum values, which would result in the motor not operating at its full capacity at the base speed.