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__________?
Mass transfer co-efficient is directly proportional to DAB according to the __________ theory?
Dorr thickener is an equipment used for__________?
Can the efficiency of a plate in the distillation tower be greater than 100% ?
With the lowering of equilibrium pressure, at a given temperature, the amount of adsorbate on the adsorbent ?
H2S present in naphtha reformed gas is removed by absorbing with__________?
In liquid extraction, if the selectivity is unity, then__________?
Drying of a wet solid under constant drying conditions means the exposure of the wet solid to the air of constant__________?
Design calculation for multiple component distillation is done by__________?
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?
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__________?
High pressure at the bottom of a distillation tower handling heat sensitive materials results in__________?
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__________?
Which of the following is directly concerned with Psychrometry ?
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 ?

Pick out the wrong statement ?

A. Co-current absorbers are usually used, when the gas to be dissolved in the liquid is a pure
substance
B. In case of gas absorption, HETP is equal to HTU, when both the operating line & the
equilibrium lines are parallel
C. Hatta number is important in case of gas absorption with chemical reaction
D. In actual practice, absorption is an endothermic process, while stripping is an exothermic
process

Correct Answer: D. In actual practice, absorption is an endothermic process, while stripping is an exothermic
process ✔

Last Updated: February 15, 2019