In case of pulverised coal fired steam boiler, the secondary air serve – McqOptions

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1.	In case of pulverised coal fired steam boiler, the secondary air serves the main purpose of__________________?
A.	Transportation of coal
B.	Drying of coal
C.	Combustion of coal by supplying it around the burner
D.	Preheating the primary air
Answer» D. Preheating the primary air

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