Chemical Engineering Objective Questions { Fuels and Combustion }

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176. Fuel combustion is never cent per cent efficient due to

A. Incomplete combustion

B. Dry gas/stack gas loss

C. Moisture loss

D. All of the above

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177. Coal is pulverised before burning in large capacity boiler furnaces mainly to

A. Ensure its complete combustion

B. Facilitate easy ash removal

C. Enhance its calorific value

D. Provide trouble free operation

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178. Spontaneous combustion of coal on storage results due to

A. Inadequate ventilation

B. Low temperature oxidation

C. Storage in large heaps with small surface to volume ratio

D. All of the above

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179. Coalification means the

A. Process of conversion of lignite into anthracite

B. Underground gasification of coal

C. Complete combustion of coal

D. Direct hydrogenation of coal

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180. Coking coals are invariably

B. Bituminous coals

C. Semi-anthracites

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181. Which of the following will generate maximum volume of product of complete combustion (Nm³/Nm³ of fuel)?

A. Carburetted water gas

B. Blast furnace gas

D. Producers gas

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182. Use of excess of combustion air in the combustion of fuels results in

C. Condensation of water vapour from the fuel gas

D. None of these

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