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In a diesel engine the high temperature needed to ignite the fuel is achieved by
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- using heat from exhaust
- the battery
- compressing air in the cylinders
- an electrical spark
- using heat from exhaust
Correct Option: C
Diesel engines use the heat of compressed air to ignite the fuel (intakes air, compresses it, then injects fuel). Diesel engines need high compression ratios to generate the high temperatures required for fuel auto ignition.
