chemical engineering fuels and combustion MCQs – Page 15

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 Review each marked answer and report any item that may be outdated or unclear.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

281. High amount of sulphur and phosphorous in coke causes ____________________ ?
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A. Decrease in its calorific value

B. Brittleness of steel made by using it

C. Increase in its strength

D. None of these

282. The temperature at which plastic layer formation takes place during carbonisation of coal varies from ______________ C ?
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A. 350 to 450

B. 700 to 850

C. 550 to 650

D. 100 to 150

283. Fixed carbon in coal is defined as______________________?
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A. The total quantity of carbon present in the coal

B. The one which is present in the residue after combustion

C. That present in volatile matters

D. Hundred minus the percentage of volatile matter, ash and moisture

284. Efficiency of the combustion of a fuel is judged by the ______________ the flue gas?
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A. Temperature of

B. Colour of

C. % of CO2 in

D. % of O2in

285. When incomplete combustion loss is high, the flue gas analysis shows large amount of ________________?
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A. O2

B. CO

C. C

D. CO2

286. Degree of carbonisation of coal during coke making can be roughly judged by the ______________ of the coke produced?
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A. Volatile matter

B. Moisture content

C. Colour

D. Ash content

287. Water gas constitutes mainly of __________________?
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A. CH4 & H2

B. CO & H2

C. CO & N2

D. CO2 & H2

288. Which of the following can be made into briquettes without the use of a binder ?
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A. Anthracite coal

B. Lignite

C. Bituminous coal

D. None of these

289. Gobar gas constitutes mainly of___________________?
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A. CO & CO2

B. CO & N2

C. CH4 & CO2

D. CH4 & N2

290. In Orsats apparatus, ammoniacal cuprous chloride is used for selectivity absorbing________________?
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A. O2

B. CO

C. H2O

D. CO2

291. Low temperature carbonisation of coal takes place at ______________ C?
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A. 300

B. 150

C. 700

D. 1100

292. Furnace oil consumption in a furnace for a given duty employing preheated combination air (at 300) may be reduced by about ______________ percent as compared to the use of atmospheric combustion air?
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A. 5

B. 10

C. 20

D. 35

293. Pick out the wrong statement ?
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A. Theoretical flame temperature is the temperature attained by the products of combustion, when the fuel is burned without loss or gain of heat

B. Burning the fuel with theoretically required amount of pure oxygen results in attainment of maximum adiabatic flame temperature

C. Burning the fuel with excess pure oxygen results in maximum theoretical flame temperature

D. Adiabatic flame temperatures of actual combustions are always less than the maximum values

294. KOH solution used in Orsat apparatus absorbs____________________?
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A. CO2

B. SO2

C. Both A. & B.

D. Neither A. nor B.

295. The calorific value of natural gas is about ______________ kcal/Nm3?
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A. 25,000

B. 35,000

C. 2,500

D. 10,000

296. Oxygen percentage (by weight) in atmospheric air is_________________?
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A. 23

B. 29

C. 21

D. 19

297. Blast furnace gas constitutes mainly of_________________?
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A. N2 & CO

B. CH4 & CO2

C. N2 & H2

D. N2 & CH4

298. In low temperature carbonisation of coal as compared to high temperature carbonisation _____________ produced is less?
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A. Free carbon content in tar

B. Difference in gross & net calorific value of the coke oven gas

C. Yield of ammonia present in coke oven gas

D. Yield percentage of coke

299. Blast furnace gas is a very poisonous gas because of its predominantly high _______________ content?
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A. H2O

B. CH4

C. CO

D. CO2

300. Main constituent of natural gas is ________________?
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A. H2

B. C2H6

C. C3H8

D. CH4 (upto 90%)

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