Discussion
A dc drive is easier to control than an early ac drive because
Answer: B
Correct answer: its torque follows a single current directly
In a dc machine \( T = k\Phi I_a \), and with the flux held constant the torque is proportional to one measurable current, which a simple loop can regulate. Field and armature are physically separate and orthogonal, so controlling one does not disturb the other. An early ac drive had no such handle: only with field-oriented control, which resolves the stator current into flux and torque components, did the induction machine acquire the same property.
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