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Chemical Engineering Mcqs 9594 MCQs [All-Courses]

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Chemical Engineering MCQs designed for job test and interview preparation, particularly for fresh graduates, students, and candidates appearing in competitive exams. These multiple-choice questions cover important topics such as the fundamentals of chemical engineering, chemical processes, chemical reactions, process control, and instrumentation, along with other key concepts in the field.

All Topics  9594

ombustion of pulverised coal compared to the lumpy coal __________________?
A
B Facilitates combustion with lower excess air
C Provides higher thermal efficiency & flame temperature
D All A., B. & C.
Correct Answer: All A., B. & C.
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
Correct Answer: Its thorough mixing with air
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
Correct Answer: 105
Coke oven gas burns with a yellowish flame, because of the presence of __________________?
A CO2
B CH4
C H2
D NH3
Correct Answer: CH4
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
Correct Answer: Caking properties diminish
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.
Correct Answer: All A., B. & C.
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
Correct Answer: Electrostatic precipitator
Pick out the wrong statement ?
A Pulverised fuel can be completely burnt with less percentage of excess air compared to lump
B Low grade coal can be used, but generally high volatile matter coals are more suitable for
C Regulation of furnace temperature and atmosphere (oxidising or reducing) is easily possible
D None of these
Correct Answer: None of these
Pick out the wrong statement ?
A Angle of repose of coal increases with its increasing size
B Specific gravity of coal increases with its increasing maturity
C Refractive index and reflectance of coal increases with the increasing rank of coal
D Specific heat of coal decreases with increases in the volatile matter and decrease in the C/H
Correct Answer: Specific heat of coal decreases with increases in the volatile matter and decrease in the C/H
‘Wobbe index’ is a characteristic of__________________?
A Solid fuels
B Gaseous fuels
C Liquid fuels
D Fat coals
Correct Answer: Gaseous fuels
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