__________ is the temperature at which a gas-vapor mixture becomes saturated, when cooled at constant total pressure out of contact with a liquid ?
For absorbers, high pressure drop results in__________?
The binary diffusivity in gases at atmospheric conditions is about __________?
Occurrence of ‘case hardening’ during drying of a high moisture solid cake __________ the drying rate?
Refractory bricks are usually dried in a __________ dryer?
The most common packing used in industrial operations is __________ rings?
Capacity of a rotary dryer depends on its __________?
Berl saddle made of carbon cannot be used for __________?
For achieving rapid drying rate in a spray dryer, the diameter of the particles in the feed should be in the range of __________ microns (1 mm = 1000 microns)?
If G = insoluble gas in gas stream and L = non-volatile solvent in liquid stream, then the slope of the operating line for the absorber is__________?
Corresponding to Prandtl number in heat transfer, the dimensionless group in mass transfer is the __________ number?
Physical absorption is__________?
Ion exchange process is similar to__________?
Only small amount of evaporation of water produces large cooling effects because of its__________?
As the reflux ratio decreases, the__________?
With increase in absolute humidity, the dew point of an unsaturated mixture of air and water vapor (at constant pressure and temperature) ?
Heat in BTU necessary to increase the temperature of 1 lb of gas and its accompanying vapour by 1°F is called the__________?
For which of the following unit operations, Lewis number is of significance ?
The minimum number of theoretical plates is required for achieving a given separation in distillation column with__________?
The drying time between fixed moisture contents within the ‘constant rate period’ is proportional to (assuming that drying occurs from all surfaces of the solid) (where, T = thickness of the solid) ?
Sticky material can be dried in a __________ dryer ?
Drying operation under vacuum is carried out to __________?
In case of absorption with exothermic reaction, for fluids having __________?
At equilibrium the concentration of water in vapour phase (C*) in kg/m3 of air space and the amount of water (m) adsorbed per kg of dry silica gel are related by, C* = 0.0667m. To maintain dry conditions in a room of air space 100m3 containing 2.2 kg of water vapour initially, 10 kg of dry silica gel is kept in the room. The fraction of initial water remaining in the air space after a long time (during which the temperature is maintained constant) is__________?
In a counter-current extractor, as the axial mixing increases, the extraction efficiency__________?
In saturated gas, the__________?
Which of the following remains constant during sensible cooling process ?
For contacting a highly soluble gas with a liquid __________?
The assumption made in Elis method in distillation is that enthalpy concentration lines of vapor and liquid are __________?
Diffusivity in concentrated solutions differs from that in dilute solutions, because of the changes in __________?
The binary diffusivity in gases does not depend upon the __________?
The Knudsen diffusivity is dependent on the __________?
Overall efficiency of the distillation column is __________?
For a binary mixture with low relative volatility, continuous rectification to get pure products will require__________?
Critical humidity of a solid salt means the humidity__________?
CO2 can be absorbed by__________?
The equipment frequently used for adiabatic humidification-cooling operation with recirculating liquid is__________?
Solvent used in extractive distillation__________?
Weight of 1 m3 of humid air as compared to 1 m3 of dry air, under the same conditions, is__________?
Which of the following remains constant during evaporative cooling process with recirculated water supply ?
If a two phase system is in physical equilibrium; then it means that, the__________?
In a packed absorption tower, if the equilibrium and operating lines are both straight lines, then the ratio, HETP/HTUOG __________ the absorption factor?
If a1 and a2 are the relative volatilities when the pressure in the distillation column is 1 and 2 atm respectively. Pick out the correct statement ?
Percentage saturation is __________ the relative saturation?
In an interphase mass transfer process, the lesser the solubility of a given solute in a liquid, the higher are the chances that the transfer process will be__________?
Water-ethyl alcohol solution can be concentrated (in respect of alcohol concentration) by __________ distillation?
When the temperature and humidity of air is low, we usually use __________ draft cooling tower?
In case of liquid-liquid binary diffusion, diffusivity of one constituent into another is not dependent on the__________?
Leaching of sugar from sugar beets is done by__________?
In an absorber, HETP does not vary with the__________?
Which of the following parameters remains almost constant during adiabatic saturation of unsaturated air ?

Pick out the wrong statement ?

A. The mole fraction of solute is directly proportional to the molality of a ‘dilute’ solution
B. For a non-reacting binary mixture of ideal gases, the partial pressure distribution of both
components is nonlinear in the case of steady state unimolal unidirectional diffusion
C. Azeotropes obey Raoult’s law at all temperature
D. The relative volatility of a binary mixture at the Azeotropic composition is 1

Correct Answer: C. Azeotropes obey Raoult’s law at all temperature ✔

Last Updated: March 07, 2019