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Diameter to height ratio for a raschig ring is_____________________?
Related MCQs
With decrease in the throughput (compared with the design capacity) for a bubble cap distillation column, its efficiency__________?
For experimental determination of mass transfer co-efficient by wetted wall tower, the mass transfer area is__________?
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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?
Diameter to height ratio for a raschig ring is_____________________?
A. 1
B. 0.5
C. 2
D. 8
Correct Answer:
1
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Last Updated:
February 16, 2019