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What quantities need to maintained/regulated for effective control of combustion?

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What quantities need to maintained/regulated for effective control of combustion?

(a) Induced draught and forced draught fans pressure

(b) Air and steam gauge pressure

(c) Fuel flowing out of stoker

(d) Air and fuel supply

The question was posed to me in unit test.

My doubt is from Principle of Automatic Control of Combustion topic in chapter Steam Power Plant of Energy Engineering

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Best answer
Correct option is (d) Air and fuel supply

Best explanation: Combustion can be effectively controlled by regulating the quantities of air and fuel or both. Control of combustion can be by manual or automatic means. Automatic control of combustion is used to distribute the load evenly on the boiler as per the changing demand.

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