Depending on what factor are the air ducts opened and closed in travelling grate stoker?(a) On the type of grate used(b) On the speed that is attained(c) On the type of coal used(d) Depending on intensity of boilerThis question was addressed to me during an interview.My query is from Type of Stokers topic in chapter Steam Power Plant of Energy Engineering

Depending on what factor are the air ducts opened and closed in travel

1.	Depending on what factor are the air ducts opened and closed in travelling grate stoker?(a) On the type of grate used(b) On the speed that is attained(c) On the type of coal used(d) Depending on intensity of boilerThis question was addressed to me during an interview.My query is from Type of Stokers topic in chapter Steam Power Plant of Energy Engineering
Answer» Right choice is (c) On the type of coal used For EXPLANATION I would say: DEPENDING on type of coal burned, the grate has air OPENINGS in the range of 20-40 percent of the total area. The air supply to different parts of the stoker is regulated to meet the CHANGING demand through these sections.

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