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chemical engineering fuels and combustion MCQs

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 Review each marked answer and report any item that may be outdated or unclear.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
1. Which is the heaviest fuel gas out of the following ?
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A. Blast furnace gas

B. Water gas

C. Carburetted water gas

D. Coke oven gas

2. Tar yield in the low temperature and high temperature carbonisation of dry coal may be respectively ______________ percent?
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A. 15 & 8

B. 10 & 3

C. 3 & 10

D. 10 & 20

3. Nitrogen in coal_________________?
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A. Is present upto 1-2%

B. All A., B. and C.

C. Is recovered as ammonia during its carbonisation

D. Comes from protein in parent vegetable matter

4. Highly caking coals_____________________?
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A. Produce weak coke

B. Produce strong coke

C. May damage the coke oven walls during carbonisation

D. Both B. and C.
5. Number of macrocomponents present in coal according to Stopes are ___________________?
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A. Two

B. Four

C. Six

D. Five

6. Incomplete combustion of a fuel is characterised by the high _______________ in the flue gas?
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A. Smoke

B. Oxygen

C. Carbon monoxide

D. Temperature

7. Which of the following is not a by-product fuel ?
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A. Pitch

B. Refinery gas

C. Blast furnace gas

D. Petrol
8. Presence of nitrogen in combustion air does not reduce the ____________________?
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A. Any of the above

B. Flue gas temperature

C. Flame temperature

D. Amount of heat liberated
9. Which of the following is the most poisonous gas ?
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A. Coke oven gas

B. Producer gas

C. Blast furnace gas

D. L.D. converter gas
10. Shatter index of the coke is a measure of its___________________?
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A. Bulk density

B. Reactivity

C. Strength
11. Coals used for the generation of producer gas should have ____________________?
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A. Low fusion point of ash

B. High caking index

C. Very low ash content (8-10%)

D. High volatile matter content
12. Volatile matter content in coking coal may be about _____________ percent?
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A. 7

B. 22

C. 46

D. 1

13. Which of the following will be unsuitable for dust cleaning from flue gas at 400C from a pulverised coal fired boiler ?
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A. Wet scrubber

B. Hydrocyclones

C. Bag filter

D. Multicyclones

14. The calorific value of L.D. converter gas is about ____________ Kcal/Nm3?
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A. 1800

B. 800

C. 4500

D. 10000

15. The average molecular weight of a flue gas having the composition by volume as CO2 = 25%, O2 = 25%, N2 = 50% will be___________________?
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A. 27.6

B. 47.3

C. 23

D. 42.9

16. Caking coal is desirable for_________________?
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A. Burning on travelling grate

B. All A., B. and C.

C. Coke making

D. Burning on firebars

17. With increase in moisture content of coal, its_____________________?
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A. Bulk density always decreases

B. Clinkering tendency during combustion increases

C. Calorific value increases sometimes

D. None of these
18. The calorific value of producer gas is around _____________ kcal/Nm3?
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A. 1300

B. 9000

C. 4500

D. 500

19. Fat coals are those coals which have very high____________________?
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A. Inherent moisture content

B. Volatile matter content

C. Caking capacity

D. Fusion point of its ash

20. Which of the following would require least amount of secondary air for combustion ?
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A. Anthracite containing 10% volatile matter and 8% ash

B. Semi-bituminous coal containing 25% ash and 20% volatile matter

C. Coke breeze containing 25% ash and 2% volatile matter

D. Bituminous coal containing 20% ash and 25% volatile matter