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Which figure is typical for starter current on a small petrol engine?

  • A.Around 20 amps, which is the figure drawn once the engine is turning at its normal cranking speed
  • B.Around 1000 amps
  • C.Around 500 amps, which is the figure typical of a large diesel engine cranking in cold conditions
  • D.Around 150 to 200 amps

Answer: D

A small petrol engine draws roughly 150 to 200 amps while cranking, and a large diesel considerably more. Five hundred amps is genuinely representative of a big diesel, which makes the last option a correct figure for the wrong engine. 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.

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