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Q3. a) Explain why pilot injection is required for a Dual fuel engine when burning natural gas.

b) Describe, with the aid of a sketch, the arrangements for a dual fuel engine which is capable of burning natural gas on;

    a) The otto cycle

    b) The Diesel cycle.

Q5. a) Describe, with the aid of a sketch, the arrangement of the Gas and liquid fuel systems at the cylinder of a dual fuel 4-stroke engine, stating the input and output signals at the controller.

(b) Describe the arrangement of the gas fuel piping system used for a 4 stroke dual fuel engine with safety features incorporated.