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    Question

    In a diesel engine the high temperature needed to

    ignite the fuel is achieved by –
    A using heat from exhaust Correct Answer Incorrect Answer
    B the battery Correct Answer Incorrect Answer
    C compressing air in the cylinders Correct Answer Incorrect Answer
    D an electrical spark Correct Answer Incorrect Answer

    Solution

    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.

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