chemical engineering MCQs – Page 281

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 Review each marked answer and report any item that may be outdated or unclear.

chemical engineering Mcqs
5601. White flue gas (resembling steam) coming out of the chimney of a thermal power plant indicates that the fuel used in the boiler furnace is_________________?
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A. Pitch

B. Pulverised coke

C. Coke oven gas

D. Tar

5602. Which of the following has the highest flame speed ?
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A. H2

B. C2H6

C. CH4

D. CO

5603. 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.

5604. Coke made in narrower by-product coke ovens (as compared to wider ovens) is _____________________?
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A. Smaller in size

B. Stronger

C. Less reactive

D. All A., B. & C.
5605. _____________ present in coal is not determined in its ultimate analysis ?
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A. Fixed carbon

B. Hydrogen

C. Nitrogen

D. Total carbon

5606. Main use of soft coke is as _______________ fuel?
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A. Foundry

B. Blast furnace

C. None of these

D. Domestic
5607. Fuel consumption in coke making can be reduced by___________________?
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A. Dry quenching of coke

B. Stamped charging of coal

C. Preheating, blending and de-ashing the coal

D. All A., B. and C.
5608. Which of the following has the highest gross calorific value ?
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A. Blast furnace gas

B. Carburetted water gas

C. Oil refinery gas

D. Coke oven gas

5609. Preheating of combustion air is done to ___________________?
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A. Complete the combustion of fuel

B. Reduce its requirement for effecting the complete combustion

C. Increase the adiabatic flame temperature

D. Increase the calorific value of the fuel

5610. Wobbe index is a characteristic of__________________?
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A. Liquid fuels

B. Gaseous fuels

C. Fat coals

D. Solid fuels

5611. Soft coke is not ___________________?
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A. Used in blast furnaces

B. None of these

C. Produced by low temperature carbonisation of coal

D. A domestic fuel

5612. Tar yield in the low temperature and high temperature carbonisation of dry coal may be respectively ______________ percent?
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A. 10 & 3

B. 3 & 10

C. 15 & 8

D. 10 & 20

5613. Which of the following gaseous fuels has the highest net calorific value (kcal/Nm3) ?
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A. Carburetted water gas

B. Natural gas

C. Producer gas

D. Liquefied petroleum gas
5614. Which of the following is coking ?
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A. Vitrain

B. Fussain

C. Both A. & B.

D. Neither A. nor B.

5615. Which of the following is not a by-product fuel ?
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A. Blast furnace gas

B. Refinery gas

C. Pitch

D. Petrol
5616. Gas yield in the Kopper-Totzek coal gasifier is about ______________ Nm3/ton coal (ash = 35%)?
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A. 1500

B. 3500

C. 150

D. 5000

5617. Sulphur in metallurgical coal__________________?
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A. Contributes to its heating value

B. Affects the quality of steel produced as cracks develop on the surface while rolling the steel

C. Both A. and B.

D. Neither A. nor B.

5618. Pure carbon is completely burnt in oxygen. The flue gas analysis is 70%CO2, 20%CO and 10%O2. The percent excess oxygen used is __________________?
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A. 10

B. 12.5

C. 20

D. 0
5619. The ratio of maximum adiabatic flame temperature in air to that in pure oxygen is always___________________?
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A. 1

B. < 1

C. > 1

D. Unpredictable

5620. The ratio of % total carbon obtained in the ultimate analysis of coke and % fixed carbon obtained in the proximate analysis is always ___________________?
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A. < 1

B. 1

C. Unpredictable

D. > 1