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Q5) (a) In the context of auxiliary boiler. Explain what do you understand by the term ‘foaming’. List the measures you would consider to prevent it? Is it different from ‘priming’ in the auxiliary boiler context? (6)

(b) Explain any one of the following with a sketch. (6)

(i) Composite boiler

(ii) Exhaust gas economiser

(c) What is the significance of ‘de-aeration’ of the boiler water? How is it achieved and what are the effects if ignored? (4)