chemical engineering fuels and combustion MCQs – Page 6

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 Review each marked answer and report any item that may be outdated or unclear.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
101. C/H ratio is the minimum in case of_________________?
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A. Furnace oil

B. Naphtha

C. Natural gas

D. Coal

102. Which of the following has the highest gross calorific value ?
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A. Coke oven gas

B. Carburetted water gas

C. Blast furnace gas

D. Oil refinery gas
103. In high temperature carbonisation (as compared to low temperature carbonisation) of coal___________________?
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A. Tar yield is less but free carbon in tar is more

B. All A., B. and C.

C. Calorific value of coke oven gas is less

D. Coke oven gas yield is more

104. Gross heating value of coal is ______________ the net heating value?
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A. Either A. or B.; depends on the type of coal

B. Same as

C. Higher than

D. Lower than

105. Which of the following has the highest heat of combustion ?
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A. C2H6

B. H2

C. CO

D. CH4

106. L.D. converter gas (produced in steel plant) comprises mainly of ___________________?
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A. CO2 & H2

B. CO (upto 65%) & CO2

C. CO2 & O2

D. CO & O2

107. Nitrogen present in the flue gas is determined in the Orsat apparatus by absorbing it in_____________________?
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A. None of these

B. Pyrogallol solution

C. KOH

D. Ammoniacal cuprous chloride

108. Advantages of fluidised bed combustion are ____________________?
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A. All A., B. & C.

B. High heat transfer rate

C. Lower furnace operating temperature

D. Reduced NOx formation in flue gas

109. Coke having higher porosity has ___________________?
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A. Higher reactivity

B. Lower bulk density

C. All A., B. and C.

D. Lower strength

110. Atomising steam to fuel oil ratio in a burner should be around__________________?
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A. 3.5

B. 2.5

C. 0.5

D. 1.5

111. In low temperature carbonisation (as compared to high temperature carbonisation) of coal__________________?
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A. Free carbon in tar is more

B. Aliphatic tar is produced

C. Ammonia yield is more

D. All A., B. and C.

112. The maximum adiabatic flame temperature is attained, when the fuel is burnt with ______________________?
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A. Theoretically required amount of oxygen

B. Theoretically required amount of air

C. More than theoretically required amount of air

D. Less than theoretically required amount of air

113. Which of the following will generate maximum volume of product of complete combustion (Nm3/Nm3 of fuel) ?
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A. Blast furnace gas

B. Carburetted water gas

C. Natural gas

D. Producers gas

114. Which of the following is not a manufactured fuel ?
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A. Tar

B. Colloidal fuels

C. LPG

D. Coal briquettes

115. Use of preheated air for combustion of fuel in the furnace, increases the___________________?
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A. Scale losses of the furnace stock

B. Flame temperature

C. Calorific value of the fuel

D. None of these

116. Naphthalene is removed from coke oven gas by________________?
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A. Absorbing in vetro-coke solution

B. Adsorbing on bog iron bed

C. None of these

D. Scrubbing with wash oil (a petroleum product)
117. The main function of primary air in pulverised coal fired burner is to_________________?
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A. Have proper combustion by supplying it around the burner

B. Preheat the tertiary air used for complete combustion of CO to CO2

C. Burn CO to CO2

D. Dry and transport the coal
118. Optimum preheating temperature for pitch creosote mixture (PCM) which is also termed as C.T.F-200, before atomisation through burners is_________________?
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A. 200 C

B. 200 K

C. 200 R

D. 200 F
119. Softening temperature of coal ash is a measure of the _____________ of coal?
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A. Clinkering tendency

B. Caking tendency

C. Coking tendency

D. Size stability

120. Fuel consumption in coke making can be reduced by___________________?
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A. Dry quenching of coke

B. All A., B. and C.

C. Stamped charging of coal

D. Preheating, blending and de-ashing the coal