Fuels and Combustion - Chemical Engineering Questions and Answers

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Which of the following gaseous fuels has the highest net calorific value (kcal/Nm³)?

Producer gas

Carburetted water gas

Natural gas

Liquified petroleum gas

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Which of the following is coking ?

Vitrain

Fussain

both (a) & (b)

Neither (a) nor (b)

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Undercharging of coal in the by-product coke ovens results in

decrease in the c.v. of coke oven gas.

increase in its throughput.

increase in the c.v. of coke oven gas.

no change in the c.v. of coke oven gas.

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During the carbonisation of coal

all tar is evolved at < 600°C.

evolution of H₂ and formation of methane and aromatics occur at > 700°C.

hard semi-coke starts shrinking at 600°C.

all (a), (b) and (c).

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Which of the following petrological constitutes is responsible for bright and lustrous black band of bituminous coal ?

Vitrain

Clarain

Durain

Fussain

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Which of the following is not a by-product fuel?

Sewage gas

Refinery gas

Producer gas

Bagasse

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White flue gas (resembling steam) coming out of the chimney of a thermal power plant indicates that the fuel used in the boiler furnace is

tar

coke oven gas

pitch

pulverised coke

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Too much of excess air in combustion results in high

fuel consumption for the same heat load.

stack gas temperature.

percentage of oxygen in flue gases.

all (a), (b) and (c).

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A fuel with high heat release rate will

require smaller combustion chamber.

have high calorific value.

have high adiabatic flame temperature.

none of these.