A. Provides poorer contact between the fluids
B. Gives lower pressure drop
C. Both A. and B.
D. Gives higher pressure drop
Correct Answer: C. Both A. and B. ✔
Last Updated: February 17, 2019
Related MCQs
- A packed tower compared to a plate tower for a particular mass transfer operation__________?
- Raoult’s law applies to the__________?
- Which of the following is an undesirable property for an absorbing solvent ?
- Langmuir equation is associated with__________?
- Radioactive nuclear waste is treated in__________?
- In case of an absorber, the operating __________?
- For continuous drying of granular or crystalline material, the dryer used is the __________ dryer?
- If mass diffusivity in a mixture is equal to the thermal diffusivity, then the Lewis number is__________
- __________ is used as an ‘entrainer’ for the separation of acetic acid-water mixture by distillation?
- Steady state equimolal counter diffusion occurs in case of __________?
- In McCabe-Thiele method of theoretical plate calculation for a distillation column, the operating lines of stripping and rectifying sections coincide with the diagonal at __________ reflux ?
- Equilibrium-moisture curves of different solids __________ ?
- The vapour pressure exerted by the moisture contained in a wet solid depends upon the__________?
- For turbulent mass transfer in pipes, the Sherwood number depends on the Reynolds number as__________?
- With increase in solvent rate, the number of transfer units, NtoG, for a fixed degree of absorption from a fixed amount of gas__________?
- At what value of reflux ratio, number of theoretical plates in a distillation column is minimum ?
- The temperature to which a vapour gas mixture must be cooled (at varying humidity) to become saturated is called the __________ temperature?
- The adiabatic saturation curve for a vapour-gas mixture is__________?
- Flights in a rotary dryer are provided to__________?
- Stefan’s law describes the mass transfer by__________?
- Fenske equation for determining the minimum number of theoretical stages in distillation column holds good, when the__________?
- Use of raschig rings in place of crushed stones as packing in packed beds (other things being same) ?
- When the psychometric ratio is __________ then the adiabatic saturation temperature and wet bulb temperature becomes equal?
- The overall mass transfer co-efficient for the absorption of SO2 in air with dilute NaOH solution can be increased substantially by__________?
- Liquid diffusivity is of the order of __________ cm2 /second?
- Molecular diffusion is caused by the__________?
- The diffusivity, DAB (for component A diffusing in B) is equal to the diffusivity DBA (for component B diffusing in A) for a binary mixture of__________?
- The expression, ln(F/W) = ∫xF xW [dx/y* – x)] is__________?
- Make up water is required in a cooling tower to replace the water lost by__________?
- In a packed tower, the value of HETP equals HTUOG, when the equilibrium and the operating lines are (where, HETP = height equivalent to a theoretical plate HTUOG = overall gas phase height of a transfer unit) ?
- In case of a desorber (stripper), the__________?
- Desirable value of absorption factor in an absorber is__________?
- Leaching of coffee from coffee beans is done by__________?
- If the solubilities of different components (in a liquid-liquid extraction system) increase with rise in temperature, then the temperature above which they dissolve completely is known as the critical solution temperature (CST or consolute temperature). If solubilities increase with decrease in temperature, then CST is the temperature below which they dissolve completely. If a binary system has no critical solution temperature, it implies that__________?
- __________ column is preferred to be used, when a high liquid hold up is required in a reactor for gas-liquid reaction ?
- During bottling of cold drinks (e.g. Pepsi), the main resistance to mass transfer for the absorption of carbon dioxide in water lies in the__________?
- In the absorption of ammonia in water, the main resistance to absorption is by the __________ phase?
- Tray spacing in a distillation column of dia 10-12 ft. used in petroleum refinery may be around __________ inches?
- In a moderately sized packed absorption tower, channelling (which is most severe with stacked packings) can be minimised by taking the ratio of tower diameter to packing diameter ?
- Heat sensitive materials with very high latent heat of vaporisation may be economically separated using__________?
- A distillation column with N plates is being operated under normal conditions. At some point of time, the operation is shifted to total reflux condition (i.e., no product and residue are being withdrawn and feed to the column is stopped). At the new steady state ?
- Batch tray dryers suffers from the disadvantage of__________?
- Smoke is an example of __________?
- Rotary dryers cannot handle __________ materials ?
- Prandtl number for water at 20°C is about __________?
- The difference of wet bulb temperature and adiabatic saturation temperature of unsaturated mixture of any system is__________?
- 1 kg of a saturated aqueous solution of a highly soluble component A at 60°C is cooled to 25°C. The solubility limits of A are (0.6 kgA/kg water) at 60°C and (0.2 kgA/kg water) at 25°C. The amount in kg of the crystals formed is__________?
- Moisture in a substance exerting an equilibrium vapour pressure less than that of pure liquid at the same temperature is called the __________ moisture?
- Which of the following is not a continuous drier ?
- In an operating distillation column, the__________?
- As per Gilliland’s equation, the diffusivity is__________?