chemical engineering fuels and combustion MCQs – Page 18

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 Review each marked answer and report any item that may be outdated or unclear.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
341. Producer gas comprises mainly of _______________________?
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A. CO2 & H2

B. CO & N2

C. CO2 & N2

D. CO & H2

342. Low temperature carbonisation of coal produces_________________?
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A. Very low calorific value coke oven gas

B. Soft coke

C. No by-products

D. Metallurgical coke

343. Calorific value of both the solid & liquid fuels can be determined by using ______________ calorimeter?
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A. Bomb

B. None of these

C. Boys

D. Junkers

344. In high temperature carbonisation (as compared to low temperature carbonisation) of coal, the______________?
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A. Gas yield is less

B. Ignition temperature of coke produced is less

C. Aromatic content of tar produced is more

D. Tar yield is more

345. A coal having higher volatile matter content will necessarily have lower____________________?
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A. Ash fusion temperature

B. Ignition temperature

C. Caking index

D. Calorific value

346. Presence of ______________ in a dry gaseous fuel does not contribute to its calorific value?
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A. Hydrogen

B. Oxygen

C. Sulphur

D. Carbon

347. High ash coals ____________________?
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A. None of these

B. Require longer time of carbonisation as ash offers resistance to heat transfer

C. Produce larger quantity of coke oven gas

D. Are soft & friable (poor strength and size stability)

348. Which of the following accounts for maximum energy loss in a boiler ?
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A. Flue gases

B. Unburnt carbon in flue gases

C. Incomplete combustion

D. Ash content in the fuel

349. Assam (India) coals suffers mainly from the disadvantage of high ______________ content?
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A. Sulphur (4-6%)

B. Moisture

C. Volatile matter

D. Ash

350. Bright coal__________________?
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A. Is non-coking

B. Contains more than 90% durain

C. Contains mainly vitrain & clarain and is generally coking

D. Contains more than 90% fussain

351. ____________ process is meant for direct hydrogenation of coal to produce liquid fuel?
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A. Fischer-Tropsch

B. None of these

C. Lurgi

D. Bergius
352. Preheating of combustion air is done to ___________________?
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A. Complete the combustion of fuel

B. Increase the calorific value of the fuel

C. Increase the adiabatic flame temperature

D. Reduce its requirement for effecting the complete combustion

353. Which of the following is not a binder for coal briquetting ?
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A. Coal tar

B. None of these

C. Bitumen

D. Molasses

354. High temperature carbonisation of coal produces__________________?
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A. Large quantity of tar compared to low temperature carbonisation

B. None of these

C. Less of gases compared to liquid products

D. Inferior coke compared to low temperature carbonisation

355. Bomb calorimeter is used to determine the (where, GCV Gross Calorific Value. NCV Net Calorific Value.) ?
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A. NCV at constant volume

B. GCV at constant pressure

C. NCV at constant pressure

D. GCV at constant volume
356. Calorific value of wood gas is about ______________ kcal/Nm3?
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A. 1500

B. 3300

C. 5400

D. 8500

357. Coal tar fuel 200 (CTF 200) is a mixture of __________________?
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A. Solar oil and pitch

B. Pitch and creosote oil

C. Anthracene and crecosote oil

D. Light oil and pitch

358. Blast furnace coke is made from coal by_____________________?
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A. High temperature carbonisation

B. Heating the coal in an oven in presence of air

C. Medium temperature carbonisation

D. Low temperature carbonisation

359. Light oil whose major component is Benzol, is obtained by the distillation of crude tar in the temperature range of _____________ C?
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A. 200-300

B. 280-300

C. 250-270

D. 80-170
360. Which of the following is not increased by using preheated combustion air in place of ordinary air at room temperature ?
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A. Calorific value of the fuel

B. Flame temperature achieved

C. Speed of combustion of fuel

D. Heat transfer rate to the stock in the furnace