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Which duty cycle limitation applies to a starter motor?

  • A.Short cranking bursts with rest between attempts
  • B.Continuous operation for several minutes, which is permitted provided that the battery is able to supply the current
  • C.No limitation
  • D.One attempt only, after which the motor must be allowed to cool completely before it may be operated again

Answer: A

Manufacturers specify perhaps ten seconds of cranking followed by a rest, because the windings heat rapidly at those currents. Continuous cranking burns the motor out. A single attempt limit would be impractical. The shared behaviour explains why these belong together and the differences explain why both exist. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Checking which component actually carries the load settles most questions of this kind at once.

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