Fuels and Combustion - Chemical Engineering Questions and Answers

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Efficiency of the combustion of a fuel is judged by the __________ the flue gas.

%of CO₂ in

% of O₂in

temperature of

colour of

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Tolerable concentration of toxic carbon monoxide in atmospheric air is about __________ PPm.

1000

5000

10000

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Rate of low temperature oxidation of coal due to bad storage conditions

decreases with increase in surface area.

does not vary with increase in surface area.

is more for low volatile coal compared to high volatile coal.

is accelerated by storage in large heaps with small surface to volume ratio.

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Pick the odd man out.

Briquettes

Wood

Oil gas

Pitch creosote mixture

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Preheating of __________ the flame temperature.

the gaseous fuel before combustion decreases

combustion air decreases

either the fuel or the air or both, increases

either the fuel or the air does not affect.

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Which of the following has the highest heat of combustion?

H₂

CH₄

C₂H₆

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Calorific value of wood gas is about __________ kcal/Nm³.

1500

3300

5400

8500

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Which adsorbant is used for removing sulphur compounds (S Q, H₂S, RSH etc.) removal from coke oven gas in by-products recovery plant ?

Silica gel

Diatomaceous earth

Basalt

Bog iron (i.e., moist ferric hydroxide)

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Temperature of coke oven gas just before entering into saturator (for recovery of NH₃) is about __________ °C.

120

180