Chemical Engineering:: Fuels and Combustion

Blast furnace coke is made from coal by

A. low temperature carbonisation.
B. high temperature carbonisation.
C medium temperature carbonisation.
D. heating the coal in an oven in presence of air.

Carbon Content by weight in air dried wood may be about __________ percent.

A. 10
B. 25
C 50
D. 80

Which of the following accentuates clinker-ing trouble on furnace grate burning coal ?

A. Low reactivity of carbonised residue containing high proportions of iron & sulphur.
B. Low forced draught and fuel bed temperature.
C Thick fire bed and preheated primary air.
D. All (a), (b) and (c).

Natural draught produced by a chimney depends upon the

A. density of the chimney gases.
B. height of the chimney.
C both (a) and (b).
D. neither (a) nor (b).

Gross & net calorific value is the same for

A. blast furnace gas
B. coke oven gas
C L.D. converter gas
D. none of these

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