Discussion
Assertion (A): A starter uses a series wound motor.
Reason (R): A series wound motor develops its greatest torque at zero speed.
Select the correct answer from the options below.
Answer: D
Field and armature currents are identical in a series machine, so torque rises with the square of current and peaks at stall. That is exactly the characteristic needed to break an engine away from rest, so the reason explains the choice. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. Tracing the requirement back to the physical constraint that produces it makes the answer follow.
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