A. Using higher reflux ratio
B. Use of increased tray spacing
C. Increasing the liquid flow rate
D. Increasing the vapour flow rate
Correct Answer: Use of increased tray spacing ✔
Last Updated: February 16, 2019
Related MCQs
- Raschig ring made of porcelain cannot be used for treating concentrated__________?
- Use of natural draft cooling tower is practised, when the air has low ?
- Molecular diffusivity of a liquid__________?
- At a fixed pressure, the humidity depends upon the partial pressure of vapor in the mixture. Humidity of a vapour free gas is __________ percent.?
- All moisture in a non-hygroscopic material is the __________ moisture?
- The value of NA/(NA + NB) for steady state molecular diffusion of gas ‘A’ through nondiffusing gas ‘B’ is__________?
- Molecular distillation is__________?
- The most efficient cooling tower out of the following is__________?
- The main reason for dividing a tall packed tower into series of small towers is to__________?
- Acetic acid will be most economically separated from a dilute solution of acetic acid in water by__________?
- Which of the following is not a batch drier ?
- The reflux to a distillation column is 100 moles/hr, when the overhead product rate is 50 moles/hr. The reflux ratio is__________?
- Bound moisture is that liquid which exerts an equilibrium vapor pressure __________ that of the pure liquid at the given temperature ?
- With increase in temperature, the rate of leaching increases, because the__________?
- Leaching rate is independent of the__________?
- Sodium bicarbonate is produced during soda ash manufacture using a __________ tower?
- The cooling effect in a cooling tower cannot be increased by__________?
- For a single component absorber, the operating line is straight only when plotted in term of __________ units?
- Dimension of mass diffusivity is the same as that of__________?
- The relation among various mass transfer co-efficients (M.T.C) for ideal gases is given by (where, Kc & Km are M.T.C. for equimolar counter diffusion with concentration & mole fraction respectively as the driving force. and, Kp= M.T.C. for diffusion of a gas through a stagnant inert gas with pressure as driving force) ?
- The temperature of water cooled in cooling tower is always __________ temperature of entering air?
- Drying of a wet solid under constant drying conditions means the exposure of the wet solid to the air of constant__________?
- With the lowering of equilibrium pressure, at a given temperature, the amount of adsorbate on the adsorbent__________?
- In liquid extraction, if the selectivity is unity, then__________?
- Mass transfer co-efficient is directly proportional to DAB according to the __________ theory?
- __________ extractor uses centrifugal force for separating the two phases?
- The operating cost of a distillation column at minimum reflux ratio is__________?
- A pure drug is administered as a sphere and as a cube. The amount of drug is the same in the two tablets. Assuming that the shape and size do not influence the mass transfer, the ratio of rate of dissolution in water at t = 0 for the cubic to spherical tablet is__________?
- With increase in temperature, the mutual solubility of two liquids__________?
- The diffusivity D. in a binary gas mixture is related to the pressure (P) as__________?
- Dorr thickener is an equipment used for__________?
- Can the efficiency of a plate in the distillation tower be greater than 100% ?
- Absorption (liquid-gas system) with evolution of heat as compared to isothermal absorption results in__________?
- Reverse osmosis is also called__________?
- Laboratory determination of the diffusivity of vapor is done by __________ method?
- Paper industry employs __________ driers?
- Use of packed towers for distillation is generally limited to the__________?
- __________ extractor is used for the concentration of radioactive nuclear waste?
- Removal of __________ exemplifies an adsorption unit operation?
- The apex of an equilateral-triangular coordinate (in ternary liquid system) represents a/an __________?
- Steady state temperature reached by a small amount of liquid evaporating into a large amount of unsaturated vapour-gas mixture is called the __________ temperature?
- In a binary distillation column, if the feed contains 40 mole % vapour, the q line will have a slope of__________?
- In case of unsaturated air__________?
- The individual mass transfer co-efficients (moles/m2s) for absorption of a solute from a gas mixture into a liquid solvent are, KL = 4.5 and KG = 1.5. The slope of the equilibrium line is 3. Which of the following resistance (s) is (are) controlling ?
- Minimum reflux ratio in a distillation column results in__________?
- Steady state equimolal counter diffusion is encountered in__________?
- Experimental determination of __________ is done by wetted wall column method?
- Measurement of the interfacial area of mass transfer is achieved easily & accurately in case of a __________ column?
- In the layout plan for a vacuum distillation unit, operating at 60 mm Hg, supported by a barometric condenser, the appropriate place for the location of vacuum drum for collecting the distillate will be__________?
- High pressure at the bottom of a distillation tower handling heat sensitive materials results in __________?
- Which of the following is an undesirable property in a tower packing ?