Ratio of primary air to secondary air increases with increase in the r – McqOptions

MCQOPTIONS

1.	Ratio of primary air to secondary air increases with increase in the rank of coal, because the__________________?
A.	High rank coals have higher amount of volatile matter
B.	Ratio of fixed carbon to volatile matter increases
C.	Oxygen content progressively decreases
D.	Calorific value of the coal increases
Answer» C. Oxygen content progressively decreases

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