Fuels and Combustion MCQs

Chemical Engineering Objective Questions

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232. Which of the following is unsuitable fuel for producer gas manufacture?

C. Coal having low fusion point of its ash

D. Coal having high fusion point of its ash

233. Preheating of coal charge for the coke ovens reduces the

A. Time of carbonisation

B. Yield of gas and tar

C. Fuel consumption in coking

D. All of the above

234. Fossil fuels mean

B. Liquid fuels

C. Those fuels which are found in the crust of earth

D. Premature fuels with low calorific value

235. Froth floatation is used for

A. Washing fine coal dust (< 0.5 mm size)

B. Washing lump coal (> 80 mm size)

C. Removing ash from the coal based on difference in specific gravity of coal and ash

D. All of the above

236. Main use of soft coke is as __________ fuel.

B. Blastfurnace

D. None of these

237. Fussain . . . . . . . .

A. Is friable, charcoal like substance

B. Has highest fixed carbon and lowest volatile matter content of all the four banded components of coal

C. Is non-coking, but when blended with highly coking coal, controls its swelling and produces high strength coke on carbonisation

D. All of the above

238. Deficiency of combustion air during combustion of a gaseous fuel

A. Lengthens the flame

B. Causes heat loss of fuel by its partial combustion

D. Shortens the flame

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