A. Lewis relationship
B. Galileo number
C. Weber number
D. Dean number
Correct Answer: Lewis relationship ✔
Last Updated: February 15, 2019
Related MCQs
- Measurement of the interfacial area of mass transfer is achieved easily & accurately in case of a __________ column?
- At the boiling point of the liquid at the prevailing pressure, the saturated absolute humidity becomes__________?
- Ammonia present in the coke oven gas is removed by washing with__________?
- Most important factor to be considered in the selection of packings for absorbers is the __________ of packing?
- Which of the following provides maximum contact surface for a liquid-vapour system ?
- Experimental determination of __________ is done by wetted wall column method?
- Which is not concerned directly with mass transfer ?
- To get high tray efficiency__________?
- For ethanol-water system, the lowering of distillate quality from 95% to 92% will cause __________ plate requirement?
- Lewis number (Le) is__________?
- In a gas-liquid absorption column, for obtaining the maximum absorption efficiency__________?
- Humidity chart is useful for the solution of problems concerning condensation, vaporisation and air conditioning. At a given dry bulb temperature, value of humidity obtained from the humidity chart directly, is in terms of __________ humidity?
- Powdery materials can be guarded against caking tendency on storage by__________?
- Leaching of uranium ore and gold ore is done in__________?
- For a ternary mixture, in which equilateral triangular co-ordinate is used in leaching and extraction, a __________ of the equilateral triangular co-ordinates?
- The slope of the operating line for a single component co-current absorber when plotted in terms of mole ratio units is__________?
- The minimum liquid rate to be used in an absorber corresponds to an operating line__________?
- Separation of two volatile liquids by distillation makes use of their__________?
- The critical moisture content in case of drying indicates the __________ rate period?
- In case of physical adsorption, the difference between heat of adsorption and heat of normal condensation is__________?
- A solid is being dried in the linear drying rate regime from moisture content Xo to XF. The drying rate is zero at X = 0 and the critical moisture content is the same as the initial moisture Xo. The drying time for M = (Ls/ARc) is (where, L = total mass of dry solid, A = total surface area for drying Rc = Constant maximum drying rate per unit area X = moisture content (in mass of water/mass of dry solids)) ?
- The drying time between fixed moisture content within diffusion controlled ‘falling rate period’ is proportional to (assuming that drying occurs from all surfaces of the solid) (where, T = thickness of the solid) ?
- The dew point of an unsaturated gas-vapor mixture does not depend upon the __________ of the mixture?
- The Hatta number is important in__________?
- Freundlich equation applies to the adsorption of solute from__________?
- The slope of 9-line is determined by the__________?
- For a binary mixture with low relative volatility__________?
- The interfacial area per unit volume of dispersion, in a gas-liquid contactor, for fractional hold up of gas = 0.1 and gas bubble diameter = 0.5 mm is given by (in m2/m3)__________?
- Plate efficiency in a distillation column is reduced due to the __________ of liquid?
- In extraction, as the temperature increases, the area of heterogeneity (area covered by binodal curve)__________?
- The wet and ‘dry bulb temperature for a vapour-gas mixture are 25°C and 30°C respectively. If the mixture is heated to 45°C at constant pressure, the wet bulb temperature will be __________ °C ?
- Raoult’s law does not apply, when the__________?
- In most of the mechanically agitated liquid-liquid extractors, baffles or horizontal compartmental plates are provided, which helps in__________?
- Rayleigh’s equation applies to __________ distillation?
- Blowdown in a cooling tower__________?
- pertaining to the analogy between equations of heat and mass transfer operations ?
- Water entrained by circulating air in cooling towers is termed as__________?
- Alcohol is dehydrated using __________ distillation?
- When the mixture to be distilled has a very high boiling point and the product material is heat sensitive, the separation technique to be used is __________ distillation?
- Mechanism of moisture removal in case of freeze drying of food stuff is by __________?
- Molality is defined as the number of gm moles of solute per __________ of solvent ?
- Flash distillation is __________?
- When an unsaturated air-water mixture is heated at constant pressure, then __________ ?
- Danckwerts developed the __________ theory?
- Leaching of coarse solid lumps is also termed as __________?
- Steam distillation is used to__________?
- Which of the following can be calculated theoretically using steam table and Dalton’s law of partial pressure; if the relative humidity and dry bulb temperature of moist air is known ?
- In a vapor-liquid contacting equipment, the overall gas phase mass transfer co-efficient (M.T.C), KG is related to individual co-efficients (KG and KL) as __________ ?
- Rayleigh equation applies to __________ distillation ?
- What is the degree of freedom of an absorption process in which only one component is transferred between phases ?
- Polar organic compounds are normally used as separating agents for the azeotropic and extractive distillation. Which of the following is the most important factor to be considered for the choice of the separating agent for extractive distillation ?