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Which weakness does capacitor discharge ignition have?

  • A.An inability to operate at high engine speed, which limits its use to engines of a modest maximum speed
  • B.A short spark duration
  • C.A slow voltage rise, which allows the energy to leak away through any deposits present upon the plug electrodes
  • D.Low voltage

Answer: B

The spark lasts a fraction of the time an inductive system gives, which can leave a lean or stratified charge unignited. High speed operation is actually a strength. Multi-spark strategies compensate for the short duration. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Checking the units of each quantity catches a wrong formula before the arithmetic begins.

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