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The device that transmits torque from the starter to the engine but freewheels when the engine fires is the _____.

  • A.commutator
  • B.reduction gear, which allows a small high speed motor to develop the torque required for cranking the engine
  • C.one way clutch
  • D.solenoid, which instead moves the pinion into mesh and closes the contacts carrying the main cranking current

Answer: C

Without it the firing engine would drive the armature far beyond its safe speed before the driver could release the key. A slipping clutch produces the familiar symptom of a motor that whirs without turning anything. Checking which component actually carries the load settles most questions of this kind at once. The order in which the effects act is what decides the outcome, so it is worth establishing first. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.

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