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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

The absorption factor is defined as (where, L = liquid flow rate, G = gas flow rate and, m = slope of the equilibrium line) ?
A L/mG
B G/mL
C mL/G
D LG/m
Correct Answer: L/mG
When the feed to a distillation column is a saturated liquid, slope of the feed line is_____________________?
A Zero
B Unity
C Infinity
D None of these
Correct Answer: Infinity
Fenske-Underwood equation used for calculating the minimum number of theoretical plates in distillation column is valid for_________________?
A Constant molal overflow
B Total reflux
C Constant relative volatility
D All A., B. and C.
Correct Answer: All A., B. and C.
Solvent used in extractive distillation_________________________?
A Is of low volatility
B Forms a low boiling azeotrope
C Forms a high boiling azeotrope
D Does not alter the relative volatility of the original components
Correct Answer: Forms a low boiling azeotrope
As the reflux ratio in a distillation column is increased from the minimum, the______________________?
A Slope of the operating line in stripping section decreases
B Number of plates decreases very slowly first and then more and more rapidly
C Total cost first decreases and then increases
D Liquid flow increases while the vapor flow decreases for a system
Correct Answer: Total cost first decreases and then increases
Make up water is supplied during cooling tower operation to compensate for water losses due to______________________?
A Evaporation
B Blowdown
C Entrainment
D All A., B. & C.
Correct Answer: All A., B. & C.
An ideal tower packing should not _______________________?
A Have low weight per unit volume
B Have large surface area per unit volume
C Have large free cross-section
D Hold up large amount of liquid in the packing
Correct Answer: Hold up large amount of liquid in the packing
Positive deviation from Raoult’s law means a mixture whose total pressure is___________________?
A Greater than that computed for ideality
B Less than that computed for ideality
C Less than the sum of the vapour pressure of the components
D None of these
Correct Answer: Greater than that computed for ideality
(NSh/NRe.NSc) is termed in mass transfer operation as the __________________________?
A Stanton number
B Peclet number
C Thermal diffusivity
D Momentum diffusivity
Correct Answer: Stanton number
The operating line for an absorber is curved, when plotted in terms of _______________________?
A Mole fractions
B Mole ratios
C Partial pressure
D Mass fractions
Correct Answer: Partial pressure
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