Fuels and Combustion MCQs

C/H ratio is the maximum in case of_________________?

A. Coal
B. Furnace oil
C. Natural gas
D. Naphtha

Traces of tar fog present in the coke oven gas is removed by_________________?

A. Cyclone separator
B. Wet packed scrubber
C. Electrostatic precipitator
D. Washing with monoethanolamine

In general, the limit of inflammability/explosion limit of fuel gases is widened by the__________________?

A. Increase in gas pressure
B. Increase in temperature (i.e. preheating)
C. Use of pure oxygen for combustion instead of air
D. All a., b. & c.

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With increase in moisture content of coal, its___________________?

A. Calorific value increases
B. Caking properties diminish
C. Swelling during carbonisation becomes excessive
D. None of these

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Coke oven gas burns with a yellowish flame, because of the presence of __________________?

A. Co2
B. Ch4
C. H2
D. Nh3

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Correct viscosity of furnace oil at the burner tip for proper atomisation is about 25 centistokes. To reduce the viscosity of high viscosity furnace oil (250 centistokes) to the correct atomisation viscosity (i.e. 25 cst), it should be preheated to about ______________°C?

A. 70
B. 85
C. 105
D. 145

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Supply of excess air for complete combustion of fuel is necessitated to facilitate___________________?

A. Its thorough mixing with air
B. Attainment of chemical equilibrium
C. Attainment of high temperature
D. None of these

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ombustion of pulverised coal compared to the lumpy coal __________________?

Ca. provides better control of furnace temperature
B. Facilitates combustion with lower excess air
C. Provides higher thermal efficiency & flame temperature
D. All a., b. & c.

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High rate of heating of coke ovens____________________?

A. May damage its walls due to abrupt excessive swelling of coal
B. Produces larger size coke
C. Increases the time of carbonisation
D. None of these

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Low temperature oxidation of stored coal results in the________________?

A. Decrease in its caking power & calorific value
B. Decrease in its carbon & hydrogen content
C. Increase in its oxygen content
D. All a., b. and a.

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