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Q9. With reference to oil fired boilers:

(a) Describe, with the aid of a sketch, the fuel system including the pilot ignition system ;(6)

(b) Explain how the boiler whose fuel system is described in part (a) is flashed up from cold on diesel oil and changed over to heavy fuel operation;(6)

(c) Explain how the air and fuel supplies are controlled together in order to produce optimum combustion at all loads. (4)