chemical engineering fuels and combustion MCQs – Page 13

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 Review each marked answer and report any item that may be outdated or unclear.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

241. A good coking coal should have high ______________ content?
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A. Ash

B. Moisture

C. None of these

D. Sulphur & phosphorus

242. Which of the following is not a by-product fuel ?
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A. Sewage gas

B. Bagasse

C. Producer gas

D. Refinery gas

243. Main use of soft coke is as _______________ fuel?
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A. None of these

B. Blast furnace

C. Foundry

D. Domestic

244. 64-132) rank coal (ASTM) means a coal with 64%___________________?
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A. Fixed carbon and having a heating value around 13, 200 BTU/1b

B. Fixed carbon and heating value around 132 BTU/1b

C. None of these

D. Ash and heating value around 13, 200 BTU/1b

245. Coking time in beehive coke oven is about ___________________?
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A. 2-3 days

B. 12 hours

C. Two weeks

D. One week

246. Which of the following reactions occuring during coal gasification is called the Neumann reversal reaction ?
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A. CO + H2O ? CO2 + H2

B. C + 2H2O ? CO2 + 2H2

C. 2CO ? C + CO2

D. C + H2O ? CO + H2

247. The sequence of absorption in flue gas analysis by Orsats apparatus is respectively_______________________?
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A. CO2, CO, O2

B. CO, O2, CO2

C. CO2, O2, CO

D. O2, CO2, CO

248. Fusion point of coal ash generally varies from 1000 to 1700 C. Ash having fusion point less than _______________ C is liable to form clinker?
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A. 1100

B. 1400

C. 1350

D. 1250

249. Improper storage condition results in the weathering of coal and spontaneous combustion, which increases its_________________?
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A. Calorific value

B. Friability & oxygen content

C. Caking index

D. Yield of carbonised products

250. Calorific value of coke oven gas is around ______________ Kcal/Nm3?
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A. 900

B. 7500

C. 4200

D. 2000

251. A good metallurgical coke should have very low__________________?
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A. Porosity

B. Hardness & strength

C. Fusion point of its ash

D. Sulphur & phosphorous content

252. Coking time in narrow by-product coke ovens is around ______________ hours?
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A. 48

B. 18

C. 80

D. 8

253. Benzene is used__________________?
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A. As a perfume

B. As an explosive

C. As a motor fuel

D. For making insecticides (e.g., DDT, BHC etc.), detergent & rubber (SBR)

254. Low temperature oxidation of coal is accelerated by the____________________?
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A. Storage in large heaps

B. Storage in compressed piles

C. All A., B. and C.

D. Absence of porous or friable particles

255. The weathering index of a coal________________?
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A. Is a measure of its caking tendency

B. Is a measure of its size stability, when stored & exposed to weather

C. Is related to its calorific value

D. Gives an idea of the fusion temperature of ash

256. If oxygen content in the flue gas rises too high, fuel is being wasted by _______________?
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A. None of these

B. Dry gas/stack gas loss

C. Moisture loss

D. Incomplete combustion

257. Width of the coke oven towards coke side is slightly more than that on pusher side to____________________?
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A. None of these

B. Facilitate easy discharging of coke as it swells during carbonisation

C. Facilitate uniform heating of the oven

D. Increase the output of the coke

258. Dry air requirement for burning 1 Nm3 of CO to CO2 may be around _______________ Nm3 ?
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A. 1.75

B. 2.4

C. 11.4

D. 0.87

259. If CO2 is not fully absorbed by the KOH solution meant for its absorption in the orsat apparatus, it will appear as___________________?
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A. N2

B. CO

C. O2

D. SO2

260. Main constituents of Benzol are ____________________?
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A. Tar & creosote

B. Anthracene & phenol

C. Ammonia & phenol

D. Benzene, toluene & xylene

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