A. Increases
B. Decreases
C. Remain same
D. May increase or decrease; depends on individual design
Correct Answer: Increases ✔
Last Updated: February 16, 2019
Related MCQs
- For experimental determination of mass transfer co-efficient by wetted wall tower, the mass transfer area is__________?
- Mass transfer co-efficient is directly proportional to DAB 0.5, according to __________ theory ?
- Which of the following gas-liquid contacting devices incurs the least pressure drop for a particular duty ?
- 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__________?
- According to the film theory of mass transfer, the mass transfer co-efficient is proportional to (where, D = molecular diffusivity) ?
- For a distillation column operating at minimum reflux, the__________?
- __________ diffusion is used for separating the isotopes of methane ?
- 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__________?
- The relative saturation of a partially saturated mixture of vapour and gas can be increased by __________ of the mixture?
- Steam distillation is used for separation of high boiling __________?
- When both the fluids flow concurrently in an absorber, the slope of the operating line is__________?
- The McCabe ΔL law states that the__________?
- Very tall packed towers are divided into series of beds to__________?
- Separation of the isotopes of helium for scientific investigations is done by__________?
- Flash distillation is suitable for the separation of components__________?
- If „f’ is defined as above, then which of the following applies to a feed at dew point ?
- According to Chilton-Colburn analogy for mass transfer, NSt.NSc 2/3 is equal to__________?
- Wet bulb and dry bulb temperatures becomes identical at __________ percent saturation curve?
- The partial pressure distribution of an ideal gas diffusing through another stagnant ideal gas at steady state follows a/an __________ law?
- 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 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__________ ?
- __________ is the separation technique used for desalination of sea water ?
- At the same gas flow rate, the pressure drop in a packed tower being irrigated with liquid __________ that in dry packed tower ?
- Free flowing granular materials can be best dried in a __________ drier?
- 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 ?
- Fractional solvent extraction__________?
- The ratio of Murphree plate efficiency to point efficiency is always > 1 in a __________ flow model?
- In a packed bed absorption column, the channelling will be noted by the __________?
- Mass transfer co-efficient ‘K’ according to penetration theory varies with mass diffusivity as__________?
- A binary mixture of benzene and cyclohexane is separated by__________?
- Plate towers are preferred to packed towers, when large temperature changes are involved, because of the reason that the__________?
- The expression, y(1 – x)/x(1 – y) is for__________?
- In McCabe-Thiele method, at infinite reflux ratio__________?
- Weeping in a distillation column__________?
- The ratio of Murphree plate efficiency to point efficiency is 1 in a __________ flow model?
- The process employing desorption of the absorbed solute by a solvent is called__________?
- Plate efficiency__________?
- Diameter of raschig rings used in packed tower in industry is normally around __________ inches?
- In rectifying section of a continuous distillation column, the__________?
- The reason for preferring packed towers over plate towers in distillation practice is that the packed tower operation gives__________?
- In Azeotropic mixture, the equilibrium vapour composition is__________?
- Which of the following has the same dimension as mass diffusivity ?
- Which of the following decreases during evaporative cooling process with recirculated water supply ?
- At what percentage (by volume) of alcohol composition, it forms an azeotrope with water ?
- It takes 6 hours to dry a wet solid from 50% moisture content to the critical moisture content of 15%. How much longer it will take to dry the solid to 10% moisture content, under the same drying conditions? (The equilibrium moisture content of the solid is 5%) ?
- Steam distillation is not recommended to be used, if the __________?
- Which of the following is considered equivalent to one theoretical stage in Mc-Cabe Thiele’s method ?
- During constant rate period, the rate of drying decreases with the__________?
- Packed column distillation is limited to the column __________ metres?
- In case of constant underflow extraction operation, the __________ at all solute concentration?
- According to Poiseuille’s law, the permeability for gas flow through a capillary is proportional to (where, μ = gas viscosity)__________?