chemical engineering fuels and combustion MCQs – Page 5

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 Review each marked answer and report any item that may be outdated or unclear.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
81. A sample of natural gas containing 80% methane (CH4) and rest nitrogen (N2) is burnt with 20% excess air. With 80% of the combustibles producing CO2 and the remainder going to CO, the Orsat analysis in volume percent is_________________?
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A. CO2 : 6.39, CO : 1.60, O2 : 3.99, H2O:25.96, N2:72.06

B. CO2 : 7.42, CO : 1.86, O2 : 4.64, N2:86.02

C. CO2 : 7.60, CO : 1.90, O2 : 4.75, N2 : 85.74

D. CO2 : 6.26, CO : 1.56, O2 : 3.91, H2O :15.66, N2 : 72.60

82. Weathering of coal during storage causes_______________?
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A. Increase in its friability

B. Decrease in its caking capacity

C. All A., B. and C.

D. Reduction in coal size

83. Which of the following fuels is the best for burning on chain grate stoker ?
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A. Pulverised coal

B. Non-caking coal

C. Coking coal

D. Caking coal

84. Largest constituent of blast furnace gas is__________________?
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A. CO2

B. CO

C. N2

D. H2

85. Wood charcoal is obtained by the destructive distillation of wood. It is used in the production of activated carbon, which is not used for the____________________?
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A. Solvent recovery from air and gases

B. Electrode manufacture

C. Decolourisation of sugar

D. Absorption of gases and vapor

86. For long flame and easy ignition, the coal used should have_________________?
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A. High volatile matter

B. Low ash

C. High calorific value

D. High ash

87. Main use of hard coke produced by high temperature carbonisation is in the ____________________ ?
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A. Iron blast furnace

B. Sinter making

C. Domestic ovens

D. Cupola in foundries

88. A fuel containing carbon and carbon monoxide (but containing no hydrogen or its compounds) is burnt in pure oxygen at constant pressure. Its gross calorific value as compared to net calorific value will be_________________?
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A. More

B. Less

C. Data insufficient; cant be predicted

D. Same
89. With increase in C/H ratio of a fuel, the amount of CO2 formed on its complete combustion____________________?
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A. Remain same

B. Either A. or B., depends on other factors

C. Decreases

D. Increases
90. The shift conversion reaction taking place during water gas manufacture is given by__________________?
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A. C + 2H2O ? CO2 + 2H2

B. None of these

C. C + H2O ? CO + H2

D. CO + H2O ? CO2 + H2
91. Which of the following has the highest flame velocity ?
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A. CO

B. CH4

C. C2H6

D. H2
92. Higher fuel combustion efficiency cannot be achieved by_________________?
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A. Preheating of fuel gases & combustion air

B. Adopting proper fuel firing technique & fuel preparation

C. Supplying correct amount of combustion air

D. Reducing sulphur content in the fuel
93. Supply of excess air for complete combustion of fuel is necessitated to facilitate___________________?
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A. None of these

B. Its thorough mixing with air

C. Attainment of high temperature

D. Attainment of chemical equilibrium

94. Desirable Micum Index values of metallurgical coke are ___________________?
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A. M40 > 78% and M10 < 10%

B. M40 > 4% and M10 10% and M10 98% and M10 < 2%

95. In Lurgi coal gasifier___________________?
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A. Coking coals cannot be used

B. Low carbon conversion efficiency is achieved

C. Entrainment of solids is higher

D. Larger quantity of coal can be processed
96. Lignite is ___________________?
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A. A coking coal

B. A high rank coal

C. Can be used for gasification and steam generation

D. A black banded coal which burns with a non-smoky yellowish flame

97. Power alcohol as compared to straight run gasoline has lower ________________?
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A. Viscosity

B. Specific gravity

C. Calorific value

D. Octane number

98. Traces of tar fog present in the coke oven gas is removed by_________________?
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A. Cyclone separator

B. Wet packed scrubber

C. Electrostatic precipitator

D. Washing with monoethanolamine

99. Bomb calorimeter can be used to determine the _____________ of the coal?
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A. Sulphur content

B. Calorific value

C. Both A. & B.

D. Neither A. nor B.

100. Which of the following fuel gases is heavier than air ?
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A. Blast furnace gas

B. Natural gas

C. Coke oven gas

D. Water gas