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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

Heat in BTU necessary to increase the temperature of 1 lb of gas and its accompanying vapour by 1°F is called the________________?
A Latent heat
B Humid heat
C Specific heat
D Sensible heat
Correct Answer: Specific heat
For which of the following unit operations, Lewis number is of significance ?
A Adsorption
B Binary distillation
C Gas absorption
D Humidification
Correct Answer: Humidification
The minimum number of theoretical plates is required for achieving a given separation in distillation column with_________________?
A No reflux
B Total reflux
C Zero reflux ratio
D Minimum reflux ratio
Correct Answer: Total reflux
The drying time between fixed moisture contents within the ‘constant rate period’ is proportional to (assuming that drying occurs from all surfaces of the solid) (where, T = thickness of the solid) ?
A √T
B T
C T1.5
D T3
Correct Answer: T
Sticky material can be dried in a ________________ dryer ?
A Tray
B Rotary
C Fluidised bed
D None of these
Correct Answer: Tray
Drying operation under vacuum is carried out to __________________?
A Dry those materials which have very high unbound moisture content
B Reduce drying temperature
C Increase drying temperature
D Dry materials having high bound moisture content
Correct Answer: Reduce drying temperature
In case of absorption with exothermic reaction, for fluids having ___________________?
A Pr = Sc; percentage change in heat and mass transfer flux will be the same for a given change
B Pr = Sc = 1; total mass, momentum and thermal diffusivity will be the same
C Both A. and B.
D Pr = Sc; there won’t be any change in heat and mass transfer flux with changes in degree of
Correct Answer: Both A. and B.
At equilibrium the concentration of water in vapour phase (C*) in kg/m3 of air space and the amount of water (m) adsorbed per kg of dry silica gel are related by, C* = 0.0667m. To maintain dry conditions in a room of air space 100m3 containing 2.2 kg of water vapour initially, 10 kg of dry silica gel is kept in the room. The fraction of initial water remaining in the air space after a long time (during which the temperature is maintained constant) is_________________?
A 0.0
B 0.2
C 0.4
D 1.0
Correct Answer: 0.4
In a counter-current extractor, as the axial mixing increases, the extraction efficiency______________________?
A Increases
B Decreases
C Remains unchanged
D Depends on the pressure of the system
Correct Answer: Decreases
In saturated gas, the__________________?
A Vapour is in equilibrium with the liquid at the gas temperature
B Vapour is in equilibrium with the liquid at the room temperature
C Partial pressure of vapour equals the vapour pressure of the liquid at room temperature
D None of these
Correct Answer: Vapour is in equilibrium with the liquid at the gas temperature
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