Fuels and Combustion - Chemical Engineering Questions and Answers

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Which of the following constituents of a fuel does not contribute to its calorific value on combustion ?

Hydrogen

Sulphur

Carbon

None of these

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Lurgi gasifier (high pressure gasifier) as compared to Kopper Totzek gasifier (atmospheric pressure gasifier) produces

higher amount of methane.

lower amount of hydrogen.

both (a) and (b).

higher amount of both methane and hydrogen.

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For long flame and easy ignition, the coal used should have

high volatile matter

low ash

high calorific value

high ash

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

Carburetted water gas

Gobar gas

Natural gas

LPG

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In flue gas analysis by Orsat's apparatus, oxygen is absorbed by

potassium hydroxide.

cuprous chloride.

alkaline pyragllol solution.

none of these.

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Natural draft created by the chimney depends upon

temperature of the flue gas.

its height.

both (a) & (b).

neither (a) nor (b).

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Coke oven gas after passing through return electrostatic tar precipitator (RETP) is used for the

hot scarfing of steel slabs.

mixing with blast furnace gas.

coke oven battery heating.

steel ladle drying.

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Calorific value of a typical dry anthracite coal may be around __________ Kcal/kg.

1000

4000

8000

15000

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The most matured coal out of the following is

lignite

semi-anthracite

sub-bituminous

bituminous