Fuels and Combustion MCQs

469 MCQs — Chemical Engineering MCQs (Page 34 of 47)

Attempt Fuels and Combustion Quiz

During coking of coal, the ash content (percentage)________________?

A. Increases
B. Decreases
C. Remain constant
D. None of these

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Percentage of nitrogen in blast furnace gas may be around__________________?

A. 5
B. 25
C. 55
D. 80

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In low temperature carbonisation of coal as compared to high temperature carbonisation _____________ produced is less?

A. Difference in gross & net calorific value of the coke oven gas
B. Free carbon content in tar
C. Yield percentage of coke
D. Yield of ammonia present in coke oven gas

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The pyrogallol solution used in Orsat apparatus can absorb_________________?

A. Only o2
B. Both o2 and co2
C. Both o2 and co
D. All co, co2, and o2

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A fuel with high heat release rate will_________________?

A. Require smaller combustion chamber
B. Have high calorific value
C. Have high adiabatic flame temperature
D. None of these

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A certain thickness of the coal, if stored unscientifically on soft (katcha) ground having no metallic/concrete flooring gets sunked into the ground, which is termed as the ‘carpet loss’. The carpet loss may be of the order of ______________ cms?

A. 1 to 2
B. 3 to 4
C. 5 to 15
D. 20 to 40

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Bright coal__________________?

A. Contains more than 90% durain
B. Contains more than 90% fussain
C. Contains mainly vitrain & clarain and is generally coking
D. Is non-coking

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Low temperature oxidation of coal resulting from bad storage conditions does not decrease its______________________?

A. Caking power
B. Calorific value
C. Hydrogen content
D. Oxygen content

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High ash containing coke____________________?

A. Produces more slag when used in the blast furnace
B. Has poor strength and abrasion resistance
C. Is desirable in producer gas manufacture
D. None of these

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Which of the following fuel gases will require maximum amount of air for combustion of 1 Nm3 gas ?

A. Blast furnace gas
B. Natural gas
C. Producer gas
D. Water gas

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