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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

Tray spacing in a distillation column of dia 10-12 ft. used in petroleum refinery may be around _____________ inches?
A 5
B 30
C 60
D 100
Correct Answer: 30
In a moderately sized packed absorption tower, channelling (which is most severe with stacked packings) can be minimised by taking the ratio of tower diameter to packing diameter ?
A > 4 :1
B < 8 : 1
C > 8:1
D < 6:1
Correct Answer: > 8:1
Heat sensitive materials with very high latent heat of vaporisation may be economically separated using__________________?
A Liquid extraction
B Distillation
C Evaporation
D Absorption
Correct Answer: Liquid extraction
A distillation column with N plates is being operated under normal conditions. At some point of time, the operation is shifted to total reflux condition (i.e., no product and residue are being withdrawn and feed to the column is stopped). At the new steady state ?
A Composition of vapors and that of liquid do not vary throughout the column
B Reboiler load and condenser load are minimum
C The top and bottom compositions are unchanged with and without total reflux
D The top and bottom compositions correspond to the maximum enrichment available
Correct Answer: The top and bottom compositions correspond to the maximum enrichment available
The binary diffusivity in gases does not depend upon the ___________________?
A Pressure
B Temperature
C Nature of the components
D None of these
Correct Answer: None of these
The Knudsen diffusivity is dependent on the ______________________?
A Molecular velocity only
B Pore radius of the catalyst only
C Molecular mean free path only
D Molecular velocity and pore radius of the catalyst
Correct Answer: Molecular velocity and pore radius of the catalyst
Overall efficiency of the distillation column is _____________________?
A The ratio of number of ideal plates to actual plates
B The ratio of number of actual plates to ideal plates
C Same as the Murphree efficiency
D Always more than the point efficiency
Correct Answer: The ratio of number of ideal plates to actual plates
For a binary mixture with low relative volatility, continuous rectification to get pure products will require_____________________?
A Low reflux ratio
B Less number of trays
C Small cross-section column
D High reflux ratio
Correct Answer: High reflux ratio
Critical humidity of a solid salt means the humidity_____________________?
A Above which it will always become damp
B Below which it will always stay dry
C Both A. and B.
D Above Which it will always become dry and below which it will always stay damp
Correct Answer: Both A. and B.
CO2 can be absorbed by____________________?
A Hot cupric oxide
B Heated charcoal
C Cold Ca(OH)2
D Alumina
Correct Answer: Heated charcoal
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