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Fuels and Combustion MCQs

Chemical Engineering Objective Questions

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22. For maximum discharge through a chimney, its height should be
A. 200 meters
B. Infinitely long
C. More than 105.7 metres
D. Equal to the height of the hot gas column producing draught
Discussion
23. Fuel consumption in coke making can be reduced by
A. Preheating, blending and de-ashing the coal
B. Stamped charging of coal
C. Dry quenching of coke
D. All of the above
Discussion
24. Blast furnace gas compared to coke oven gas has
A. Lower ignition temperature
B. Narrower limit of inflammability
C. Higher calorific value
D. Lower theoretical flame temperature
Discussion
25. Combustion of pulverised coal as compared to that of lump coal
A. Develops a non-luminous flame
B. Develops a low temperature flame
C. Can be done with less excess air
D. Provides a lower rate of heat release
Discussion
26. Mott and Wheeler test is conducted on coke to find its
A. Reactivity with O2
B. Abradability
C. Phosphorus content
D. Volatile matter content
Discussion
27. Main constituent of natural gas is
A. CH4 (upto 90%)
B. C2H6
C. C3H8
D. H2
Discussion
28. Method of maintaining fires in furnace during standby periods without undue consumption of fuel is called
A. Back draughting
B. Banking
C. Under pressurising
D. None of these
Discussion

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