Discussion
Which reason makes a diesel harder to start than a petrol engine?
Answer: B
Compression ratios around eighteen to one demand far more cranking torque, and the charge must reach the self ignition temperature. That is why diesels use bigger starters and glow plugs. Diesels have no spark at all. Most errors here come from carrying across a result from a neighbouring case where it does not hold. The order in which the effects act is what decides the outcome, so it is worth establishing first. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.
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