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What happens when coke breaks into fine particles during the charging of the furnace?

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What happens when coke breaks into fine particles during the charging of the furnace?

(a) It increases the rate of combustion

(b) It cools down the temperature of furnace

(c) It chokes the air passages

(d) It stops the whole process

I have been asked this question in an interview for job.

I need to ask this question from Secondary Solid Fuels in chapter Fuels and Combustion of Engineering Chemistry II

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Right choice is (c) It chokes the air passages

The best explanation: When the coke break downs into fine particles, it hinders the flow of gases an choke the air passages. This happens due to the incomplete combustion of coke since it is broken into small pieces.

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