Discussion
The torque developed by a dc motor is proportional to
Answer: B
Correct answer: the product of flux and armature current
The torque is
\[ T = k\Phi I_a \]so it depends on the flux and the armature current together, and on nothing else. With the flux held constant - as it is below base speed on a separately excited machine - torque and current are simply proportional, which is why a dc drive controls torque by controlling current. In a series machine the flux itself is produced by the armature current, and only then does the torque become proportional to the square of the current.
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