Ratio of primary air to secondary air increases with increase in the rank of coal, because the:

ratio of fixed carbon to volatile matter increases

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high rank coals have higher amount of volatile matter

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calorific value of the coal increases

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oxygen content progressively decreases

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Solution

The correct option is A ratio of fixed carbon to volatile matter increases
Ratio of primary air to secondary air increases with increase in the rank of coal because the ratio of fixed carbon to volatile matter increases.

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Ratio of primary air to secondary air increases with increase in the rank of coal, because the:

The correct option is A ratio of fixed carbon to volatile matter increasesRatio of primary air to secondary air increases with increase in the rank of coal because the ratio of fixed carbon to volatile matter increases.

The correct option is A ratio of fixed carbon to volatile matter increases
Ratio of primary air to secondary air increases with increase in the rank of coal because the ratio of fixed carbon to volatile matter increases.