Discussion
Which danger does a series motor present if run with no load?
Answer: C
With no load the field weakens as the current falls and the speed rises without limit, which can burst the armature. In a starter the pinion disengages before that can happen. It is why a series motor is never bench run uncoupled at full voltage. Naming what changes and what stays the same is the reliable route through questions of this shape. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.
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