Discussion
Consider the following pairs of component and function.
Ignition coil - steps up the voltage
Condenser - suppresses the arc at the points
Knock sensor - detects detonation
Rotor arm - times the spark
How many of the pairs given above are correctly matched?
Answer: B
The rotor distributes the spark to the correct cylinder; timing is set by the trigger and the advance mechanisms. The other three pairings are correct, and separating distribution from timing clarifies the whole system. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Most errors here come from carrying across a result from a neighbouring case where it does not hold. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.
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