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What is the significance of rate at which air is supplied in the under feed system?

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What is the significance of rate at which air is supplied in the under feed system?

(a) Increase depth of incandescent zone

(b) Pushes up ignition zone

(c) Burns fuel for long time

(d) Supports combustion

The question was posed to me in an interview.

The origin of the question is Principle of Stoker topic in division Steam Power Plant of Energy Engineering

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Correct answer is (a) Increase depth of incandescent zone

The explanation is: The rate of air supply has marked effect on the speed of ignition in case of under feed burning as the rising air cools the raw fuel prior to ignition. At low rate of air fuel, the heat flow by conduction from the incandescent fuel bed downward is faster than the removal of heat by air. This pushes the ignition plane down below the bed surface and creates a maximum depth of incandescent zone.

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