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Which strategy compensates for a short spark duration?

  • A.Widening the gap
  • B.Advancing the timing, which gives the mixture a longer period in which to ignite before the piston descends
  • C.Firing several sparks in rapid succession
  • D.Raising the spark voltage, which ensures that the mixture is ignited by the first spark regardless of its duration

Answer: C

Multi-spark discharge fires repeatedly at low speed, giving several chances to ignite a difficult charge. Advancing the timing genuinely gives more time for combustion, which makes the last option a real if different measure. Naming what changes and what stays the same is the reliable route through questions of this shape. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Checking the units of each quantity catches a wrong formula before the arithmetic begins.

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