Chemical Engineering MCQs

6108 MCQs  (Page 182 of 611)

Attempt Chemical Engineering Quiz
Mass transfer co-efficient ‘K’ according to penetration theory varies with mass diffusivity as____________________?
A. D0.5
B. D
C. 1/d
D. D1.5
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In a packed bed absorption column, the channelling will be noted by the ____________________?
A. Increase in flow rate
B. Sharp drop in pressure drop
C. Sharp rise in pressure drop
D. None of these
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The ratio of Murphree plate efficiency to point efficiency is always > 1 in a _______________ flow model?
A. Plug
B. Perfectly mixed
C. Both a. & b.
D. Neither a. nor b.
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Fractional solvent extraction______________________?
A. Employs only one solvent
B. Employs two solvents
C. Results in low interfacial tension
D. None of these
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During dehumidification of unsaturated air wet bulb temperature & partial pressure of vapor are not constant. However, during evaporative cooling process with recirculated water supply, the _________________ remains constant ?
A. Wet bulb temperature
B. Partial pressure of water vapor
C. Relative humidity
D. None of these
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Free flowing granular materials can be best dried in a __________________ drier?
A. Rotary
B. Cylinder
C. Drum
D. Freeze
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At the same gas flow rate, the pressure drop in a packed tower being irrigated with liquid _______________ that in dry packed tower ?
A. Is greater than
B. Is lower than
C. Is same as
D. Cannot be predicted as data are insufficient
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_________________ is the separation technique used for desalination of sea water ?
A. Thermal diffusion
B. Reverse osmosis
C. Adsorption
D. Absorption
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A distillation column separates 10000 kg/hr of a benzene-toluene mixture as shown in the figure below: In the figure xF, xD and xW represent the weight fraction of benzene in the feed, distillate and residue respectively. The reflux ratio is_______________ ?
A. 0.5
B. 0.6
C. 1.0
D. 2.0
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Out of two equilibrium curves, first one lies above the diagonal and the second lies below the diagonal in the x-y plot. It means that separation by distillation is_________________?
A. Not possible in the second case unless vacuum is applied
B. Not possible in the second case unless high pressure is applied
C. More readily done in the second case compared to first one
D. None of these
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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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