Fuels and Combustion MCQs

If oxygen content in the flue gas rises too high, fuel is being wasted by _______________?

A. Incomplete combustion
B. Dry gas/stack gas loss
C. Mositure loss
D. None of these

Higher efficiency in the combustion of solid fuel cannot be achieved by________________?

A. Proper fuel preparation
B. Keeping the flue gas exhaust temperature very high
C. Adopting efficient-fuel firing technique & equipment
D. Supplying correct quantity of combustion air

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Ultimate analysis of coal determines its _______________ content?

A. Carbon, hydrogen, nitrogen & sulphur
B. Carbon, ash, sulphur & nitrogen
C. Carbon, sulphur, volatile matter & ash
D. Carbon, volatile matter, ash & mositure

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A particular coal is said to be free burning when it __________________?

A. Burns completely
B. Gives smokeless burning
C. Shows little or no fusing action
D. None of these

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Critical Air Blast (CAB) value of coke is a direct measure of its__________________?

A. Reactivity
B. Hardness
C. Strength
D. None of these

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Improper storage condition results in the weathering of coal and spontaneous combustion, which increases its_________________?

A. Caking index
B. Yield of carbonised products
C. Friability & oxygen content
D. Calorific value

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The sequence of absorption in flue gas analysis by Orsat’s apparatus is respectively_______________________?

A. Co2, o2, co
B. Co, o2, co2
C. Co2, co, o2
D. O2, co2, co

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Sometimes water is sprayed during coal charging in the coke oven, which helps in ________________?

A. Prevention of clinker formation in the oven
B. Controlling the dust nuisance while charging the coal
C. Reducing the cracking of hydrocarbons in the gas and increasing the percentage of co &
H2 In the gas (due to the endothermic reaction represented by c + h2o = co + h2)

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Coal tar fuel – 200 (CTF 200) is a mixture of __________________?

A. Pitch and creosote oil
B. Light oil and pitch
C. Anthracene and crecosote oil
D. Solar oil and pitch

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During coal carbonisation process, the conversion of semi-coke to coke is accompanied by an increase in the _______________ of the mass?

A. Density
B. Porosity
C. Electrical resistivity
D. None of these

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