Discussion
Below base speed a dc drive offers
Answer: D
Correct answer: constant torque capability
Below base speed the flux is held at its rated value and the speed is raised by increasing the armature voltage. Since \( T = k\Phi I_a \) and the current is limited by heating rather than by speed, the machine can develop rated torque at any speed in this range, and the power rises in proportion to the speed. Above base speed the voltage has reached its ceiling and the flux must be weakened, giving constant power with falling torque instead.
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