Chemical Engineering MCQs

6108 MCQs  (Page 184 of 611)

Attempt Chemical Engineering Quiz
The relative saturation of a partially saturated mixture of vapour and gas can be increased by ________________ of the mixture?
A. Reducing the total pressure
B. Increasing the total pressure
C. Reducing the temperature
D. Both b. and c.
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For a fixed number of ideal stages in a distillation column, as the reflux ratio is increased, the difference in composition between the top and bottom product streams__________________?
A. Increases
B. Decreases
C. Remain unaffected
D. Passes through a maximum
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_______________ diffusion is used for separating the isotopes of methane ?
A. Thermal
B. Pressure
C. Concentration
D. Force
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For a distillation column operating at minimum reflux, the_______________________?
A. Concentration of liquid and vapour leaving a plate will be same
B. Reflux ratio will be maximum
C. Number of plates required will be maximum
D. None of these
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According to the film theory of mass transfer, the mass transfer co-efficient is proportional to (where, D = molecular diffusivity) ?
A. D
B. D2
C. D0.5
D. 1/d
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Compound A is extracted from a solution of A + B into a pure solvent S. A Co-current unit is used for the liquid-liquid extraction. The inlet rate of the solution containing A is 200 moles of B/hr.m2 and the solvent flow, rate is 400 moles of S/m2. hr. The equilibrium data is represented by Y = 3X2 , where Y is in moles of a A/moles of B and X is in moles A/moles of S. The maximum percentage extraction achieved in the unit is_________________________?
A. 25%
B. 50%
C. 70%
D. 90%
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Which of the following gas-liquid contacting devices incurs the least pressure drop for a particular duty ?
A. Grid tray tower
B. Perforated tray tower
C. Wetted wall tower
D. Bubble cap tower
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Mass transfer co-efficient is directly proportional to DAB 0.5, according to ________________ theory ?
A. Penetration
B. Surface renewal
C. Film
D. None of these
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For experimental determination of mass transfer co-efficient by wetted wall tower, the mass transfer area is___________________?
A. Calculated
B. Unknown
C. Known
D. Not required
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With decrease in the throughput (compared with the design capacity) for a bubble cap distillation column, its efficiency____________________?
A. Increases
B. Decreases
C. Remain same
D. May increase or decrease; depends on individual design
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Word of the Day
26 Jul
Simultaneously
at the same time.
ایک ہی وقت میں، ایک ساتھ، بیک وقت

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