Fuels and Combustion
Which of the following is not a by-product recovered in a high temperature coal carbonisation plant?

Napthalene
Ethylene
Pitch-cresosote mixture (PCM)
Benzol

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Fuels and Combustion
Fussain

All of these
Has highest fixed carbon and lowest volatile matter content of all the four banded components of coal
Is non-coking, but when blended with highly coking coal, controls its swelling and produces high strength coke on carbonisation
Is friable, charcoal like substance

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Fuels and Combustion
Ratio of primary air to secondary air increases with increase in the rank of coal, because the

Oxygen content progressively decreases
Ratio of fixed carbon to volatile matter increases
Calorific value of the coal increases
High rank coals have higher amount of volatile matter

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