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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

Schmidt number and Lewis number for pure air at atmospheric conditions are respectively__________________?
A < 1 and ≈ 1
B 1 and 0
C > 1 and ≈ 1
D 0 and ≈ 1
Correct Answer: < 1 and ≈ 1
The falling rate period in the drying of a solid is characterised by__________________?
A Increase in rate of drying
B Increasing temperatures both on the surface and within the solid
C Decreasing temperatures
D None of these
Correct Answer: Increasing temperatures both on the surface and within the solid
Azeotropism for ethyl alcohol-water system disappears by_____________________?
A Increasing temperature
B Decreasing pressure
C Increasing pressure
D No means
Correct Answer: Decreasing pressure
In a liquid-liquid extraction, 10 kg of a solution containing 2 kg of solute C and 8 kg of solvent A is brought into contact with 10 kg of solvent B. Solvent A and B are completely immiscible in each other whereas solute C is soluble in both the solvents. The extraction process attains equilibrium. The equilibrium relationship between the two phases is Y* = 0.9X, where Y* is the kg of C/kg of B and X is kg of C/kg of A. Choose the correct answer?
A The entire amount of C is transferred to solvent B
B Less than 2 kg but more than 1 kg of C is transferred to solvent B
C Less than 1 kg of C is transferred to B
D No amount of C is transferred to B
Correct Answer: The entire amount of C is transferred to solvent B
Acetone is to be removed from air in an isothermal dilute absorber using pure water as solvent. The incoming air contains 5 mole% of acetone (yin = 0.05). The design equation to be used for obtaining the number of trays (N) of the absorber is, N+2 = 6 log (yin/yout).For 98% recovery of acetone, the number of trays required is/are ?
A 4
B 8
C 9
D 10
Correct Answer: 9
Sand is dried in foundries in a ______________________drier?
A Rotary
B Fluidised bed
C Vacuum
D Spray
Correct Answer: Fluidised bed
Binary distillation involves the mass transfer by ______________________ at the gas-liquid interface?
A Unidirectional diffusion from liquid to gas phase
B Unidirectional diffusion from gas to liquid phase
C Either A. or B.
D A counter diffusion at an almost equal molar rate
Correct Answer: A counter diffusion at an almost equal molar rate
Which of the following adsorbent is used to decolourise yellow glycerine ?
A Silica gel
B Alumina
C Fuller’s earth
D Activated carbon
Correct Answer: Activated carbon
Surface renewal model of mass transfer was enunciated by___________________?
A Toor and Marcello
B Fick
C Danckwerts
D Stefan
Correct Answer: Danckwerts
If Rm is the minimum reflux ratio, the optimum reflux ratio may be around _________________ Rm ?
A 1.2 to 1.5
B 2.5 to 3
C 3 to 4
D 5
Correct Answer: 1.2 to 1.5
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