chemical engineering fuels and combustion MCQs – Page 17

Practise multiple-choice questions from chemical engineering fuels and combustion for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering fuels and combustion Mcqs
321. The heat of combustion of a fuel___________________?
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A. Is equal to the heat of formation

B. Is always negative

C. Cant be known without calculating it

D. Is always positive

322. Coke made in narrower by-product coke ovens (as compared to wider ovens) is _____________________?
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A. All A., B. & C.

B. Less reactive

C. Stronger

D. Smaller in size

323. Fusion point of coal ash increases with increase in its ____________ content?
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A. Iron silicate

B. All A., B. and C.

C. Iron sulphate

D. Lime and magnesia

324. Height of coke oven is limited (say maximum upto 7 metres) mainly by the_____________________?
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A. Structural strength of silica bricks

B. Problem in door cleaning

C. Buckling of ram of pusher car at the time of coke pushing

D. Problem of uniform heating along its height
325. Which of the following is not a micro component present in coal ?
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A. Clarain

B. Liptinite

C. Micrinite

D. Fusinite

326. Benzol is used_____________________?
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A. As a motor fuel blend

B. For producing benzene, toluene & xylene by its distillation

C. Both A. & B.

D. Neither A. nor B.

327. Of the total tar present in raw coke oven gas, the tar recovered in primary cooler is about _______________ percent?
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A. 25

B. 5

C. 55

D. 75

328. Prime coking coal is always blended with medium or non- coking coal before carbonisation__________________?
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A. To check against its excessive swelling during heating, which may exert high pressure and

B. age coke oven walls

C. Because, it alone produces unreactive coke

D. Both A. and B.

E. Neither A. nor B.

329. In low temperature carbonisation of coal, the________________?
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A. Volatile matter in coke is zero

B. Yield of tar is about 3% of dry coal

C. Yield of coke oven gas is 290 Nm3 /ton dry coal

D. Temperature maintained is 700C
330. A coal having high amount of volatile matter____________________?
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A. Ignites easily and burns with long smoky flame

B. All A., B. and C.

C. Would require smaller combustion chamber

D. Produces very little of tar and gas on carbonisation

331. Calorific value of ____________________?
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A. Light paraffinic fuel oils is equal to that of equivalent olefins

B. Light paraffinic fuel oils is higher than that of equivalent olefins

C. Light paraffinic fuel oils is lower than that of equivalent olefins

D. n-paraffin is lower than that of iso-paraffins of the same compounds

332. Which of the following fertilisers is produced in the by-products recovery (from coke oven gas) plant attached to an integrated steel plant ?
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A. None of these

B. Ammonium nitrate

C. Ammonium phosphate

D. Ammonium sulphate
333. Gray King Assay and Swelling Index of a coal is a measure of its ____________________?
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A. Resistance to impact breakage

B. Agglutinating properties

C. Swelling characteristics

D. Abradability

334. During its calorific value determination by bomb calorimeter, coal is combusted by _________________?
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A. Oxygen

B. Oxygen enriched air

C. None of these

D. Air

335. Preheating of a gaseous fuel results in increased____________________?
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A. Flame temperature

B. Quantity of flue gas

C. Flame length

D. Ignition temperature

336. Calorific value as determined by bomb calorimeter is the__________________?
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A. Lower calorific value at constant pressure

B. Higher calorific value at constant volume

C. Net calorific value at constant volume

D. Gross calorific value at constant pressure

337. Out of the following fuels, the difference between the net and gross calorific value is maximum in case of_________________?
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A. Blast furnace gas

B. Pitch

C. Bituminous coal

D. Fuel oil
338. Bituminous coal___________________?
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A. Ignites less easily than anthracite

B. Is generally coking

C. Burns with smoky yellow flame

D. Both B. and C.
339. Shatter index of metallurgical coke on 2 inches and 0.5 inch screen should be respectively around _______________ percent?
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A. 95 and 100

B. 25 and 97

C. 40 and 70

D. 80 and 97
340. The optimum percentage of excess air for combustion depends upon the _______________ of the fuel?
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A. Sulphur content

B. Ignition temperature

C. Type (solid, liquid or gaseous)

D. Calorific value