chemical engineering fuels and combustion MCQs – Page 7

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 Review each marked answer and report any item that may be outdated or unclear.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
121. Initial pressure of oxygen introduced into the bomb of the bomb calorimeter for determination of calorific value of coal/fuel oil may be around _____________ atm?
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A. 25-30

B. 5-Mar

C. 60-65

D. 95-100

122. Main component of sewage gas produced during anaerobic decomposition of organic waste (by suitable bacteria) during sewage disposal is __________________?
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A. CH4

B. CO2

C. H2

D. N2

123. Which will have the least volatile matter and hence will be the most difficult to ignite ?
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A. Anthracite

B. Coke

C. Bituminous coal

D. Semi-bituminous coal

124. The main reason for making the copper calorimeter (used in bomb calorimeter) silvery white and shining/polished is to___________________?
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A. None of these

B. Minimise its corrosion

C. Make it look attractive

D. Avoid radiation heat loss
125. Which of the following petrological constitutes is responsible for bright and lustrous black band of bituminous coal ?
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A. Durain

B. Fussain

C. Clarain

D. Vitrain
126. Largest constituent of coke oven gas is_________________?
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A. CH4

B. N2

C. CO2

D. H2
127. C/H ratio is the maximum in case of_________________?
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A. Furnace oil

B. Naphtha

C. Natural gas

D. Coal
128. Gobar gas is produced by the _______________ of gobar (cow dung) ?
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A. Dehydration

B. Fermentation

C. Hydrolysis

D. Oxidation

129. Bomb calorimeter is used for the determination of calorific value of the _____________ fuels?
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A. Gaseous

B. Solid

C. Liquid

D. Both B. and C.
130. Coke oven gas burns with a yellowish flame, because of the presence of __________________?
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A. NH3

B. H2

C. CO2

D. CH4
131. Coke oven gas constitutes mainly of ____________________?
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A. H2 & CO2

B. H2 & CO

C. H2 & CH4

D. CH4 & CO

132. The bright glow of a combustion process is the characteristic of ______________ temperature oxidation of coal?
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A. Fast & slow

B. Fast & high

C. Slow & low

D. Slow & high

133. The cuprous chloride used in orsat apparatus can absorb___________________?
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A. Only CO

B. Both CO and CO2

C. Both CO and O2

D. All CO, CO2, and O2
134. The main drawback of supplying more excess air in the combustion of fuel is the_________________?
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A. Intermittent and uncontrolled combustion of the fuel

B. High exit flue gas temperature from the furnace

C. Enhanced sensible heat loss in the flue gas

D. Excessive power requirement of air blower

135. With increase in the temperature of carbonisation of coal ___________________?
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A. All A., B. and C.

B. Calorific value of the coke oven gas decreases due to cracking of hydrocarbons which is not

C. Methane content in the coke oven gas decreases and carbon monoxide content increases

D. pensated by increase in CO & H2 content

E. Hydrogen content of coke oven gas increases due to cracking of hydrocarbons

136. Natural draft created by the chimney depends upon _____________________?
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A. Temperature of the flue gas

B. Its height

C. Both A. & B.

D. Neither A. nor B.

137. Coal is pulverised before burning in large capacity boiler furnaces mainly to____________________
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A. Facilitate easy ash removal

B. Enhance its calorific value

C. Provide trouble free operation

D. Ensure its complete combustion
138. Abrasion index of blast furnace coke should be around _____________ percent?
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A. 35

B. 80

C. 55

D. 20

139. Coke oven gas produced by high temperature carbonisation of coal (as compared to that produced by low temperature carbonisation), has_________________?
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A. Higher calorific value

B. Lower hydrogen content

C. Both A. and B.

D. Neither A. nor B.
140. A carbonaceous fuel (containing no H2 or hydrocarbons) is burnt and the resulting flue gas contains 21% CO2. It means that___________________?
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A. 21% excess oxygen has been used for combustion

B. No excess air has been used for combustion

C. Complete combustion of fuel has taken place

D. 21% excess air has been used for combustion