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Which reason makes suppression necessary in an ignition system?

  • A.The high voltage would otherwise damage the control unit, which is connected to the primary circuit of the coil
  • B.No reason
  • C.The engine management system uses radio signals, which would be disturbed by the interference produced by the sparks
  • D.The spark radiates interference across a wide band

Answer: D

Each spark is a broadband radio transmitter and would ruin reception and disturb electronics. Resistors in the leads, plugs and rotor all contribute. Legal limits on emissions apply to vehicles. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Tracing the requirement back to the physical constraint that produces it makes the answer follow.

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