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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

Which of the following is not increased by using preheated combustion air in place of ordinary air at room temperature ?
A Calorific value of the fuel
B Flame temperature achieved
C Speed of combustion of fuel
D Heat transfer rate to the stock in the furnace
Correct Answer: Calorific value of the fuel
The heat of combustion of a fuel___________________?
A Is equal to the heat of formation
B Is always negative
C Can’t be known without calculating it
D Is always positive
Correct Answer: Is always negative
KOH solution used in Orsat apparatus absorbs____________________?
A CO2
B SO2
C Both A. & B.
D Neither A. nor B.
Correct Answer: Both A. & B.
In high temperature carbonisation of coal compared to low temperature carbonisation ?
A Yield of ammonia is less
B Aromatic content of tar is low
C H2 content in the coke oven gas is more
D Calorific value of the coke oven gas is lower
Correct Answer: H2 content in the coke oven gas is more
Presence of free moisture in coal during its high temperature carbonisation _____________________?
A Reduces the coking time
B Protects the volatile products from pyrolysis (cracking) in the presence of hot coke and hot
C Increases the loss of fine coal dust from the ovens when charging
D None of these
Correct Answer: Protects the volatile products from pyrolysis (cracking) in the presence of hot coke and hot
The optimum percentage of excess air for combustion depends upon the _______________ of the fuel?
A Type (solid, liquid or gaseous)
B Calorific value
C Sulphur content
D Ignition temperature
Correct Answer: Type (solid, liquid or gaseous)
Pick out the wrong statement ?
A Theoretical flame temperature is the temperature attained by the products of combustion, when the fuel is burned without loss or gain of heat
B Burning the fuel with theoretically required amount of pure oxygen results in attainment of maximum adiabatic flame temperature
C Burning the fuel with excess pure oxygen results in maximum theoretical flame temperature
D Adiabatic flame temperatures of actual combustions are always less than the maximum values
Correct Answer: Burning the fuel with excess pure oxygen results in maximum theoretical flame temperature
Pick out the wrong statement ?
A Main constituents of LPG are propane and butane
B C.V. of natural gas is about 10000 KCal/Nm3
C C.V. of LPG is about 26000 kcal/Nm3 (11500 kcal/kg)
D L.P.G. is lighter than air
Correct Answer: L.P.G. is lighter than air
Pick out the wrong statement ?
A Cokes of high reactivity are obtained from weakly coking coals
B Cokes of high reactivity are obtained from strongly coking coals
C Reactivity of coke is inversely proportional to its absolute density
D Abrasion index of the coke is a measure of its hardness
Correct Answer: Cokes of high reactivity are obtained from strongly coking coals
Pick out the correct statement ?
A Oxygen content decreases from lignite to bituminous coal as the coalification increases
B The less the oxygen content, better is the coal, as it reduces the calorific value
C With increase in oxygen content, moisture holding capacity of coal increases and the caking power decreases
D All A., B. and C.
Correct Answer: All A., B. and C.
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