Discussion
Assertion (A): A dc series motor must not be run uncoupled.
Reason (R): Its flux falls with the armature current.
Select the correct option.
Answer: C
At no load the current and hence the flux are very small, and the speed must rise enormously to generate the back emf. The reason is precisely the mechanism of the runaway, which is why such machines are geared or coupled rather than belted.
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