Drying operation under vacuum is carried out to
The mass diffusivity, the thermal diffusivity and the eddy momentum diffusivity are same for, NPr = NSc = __________
Mass transfer rate between two fluid phases does not necessarily depend on the __________ of the two phases.
Which of the following binary systems is an example of a maximum boiling azeotrope ?
Overall efficiency of the distillation column is
Chemisorption (chemical adsorption) is
Absorption factor is defined as (where, S1 = slope of the operating line S2 = slope of the equilibrium curve)
In distillation, overhead product contains
In case of an ideal solution, the total vapor pressure varies __________ with the composition expressed as mole fraction,
Mass transfer co-efficient of liquid is
Weeping in a distillation column
It takes 6 hours to dry a wet solid frommoisture content to the critical moisture content of 15%. How much longer it will take to dry the solid tomoisture content, under the same drying conditions? (The equilibrium moisture content of the solid is 5%).
Molarity is defined as the number of gm moles of solute per __________ of solvent.
Pick out the correct statement.
Agitator is provided in a crystalliser for
Psychrometry deals with the properties of gas-vapor mixture. Humidity can be determined by the measurement of the __________ of a fibre.
The amount of steam required per unit quantity of distillate in case of steam distillation will be reduced by
Air initially at3 kPa and 40°C and with a relative humidity of 50%, is cooled at constant pressure to 30°C. The cooled air has a
Dew point of a gas-vapour mixture
In a solution containing 0.Kg mole of solute andkg of solvent, the molality is
(NRe . NSc) is termed in mass transfer operation as the __________ number.
On addition of solute in the solvent, the __________ of the solution decreases.
The rate of solid-liquid extraction is limited by the
A plait point is the point on the solubility curve, where the tie line reduces to a point. What is the number of plait point for a ternery system containing twopairs of partially miscible liquids ?
With increase in pressure, the relative volatility for a binary system
Absorption accompanied with chemical reaction is exemplified by the absorption of
The value of Lewis number (Le = Sc/Pr) for air-water vapour system is around
Very tall packed towers are divided into series of beds to
__________ diffusion is used for separating the isotopes of methane.
Heat in BTU necessary to increase the temperature of 1 lb of gas and its accompanying vapour by 1°F is called the
The difference of wet bulb temperature and adiabatic saturation temperature of unsaturated mixture of any system is
Separation of two or more components of a liquid solution can not be achieved by
In a packed absorption tower, if the equilibrium and operating lines are both straight lines, then the ratio, HETP/HTUOG __________ the absorption factor.
Fenske equation determines the
The binary diffusivity in gases and liquids vary respectively as
Which is the controlling factor for a drum drier?
Raoult's law applies to the
Which of the following remains constant during sensible cooling process ?
Low viscosity absorbent is preferred for reasons of
Which of the following unit operations makes use of Thiele-Geddes equation ?
Moisture contained by a substance in excess of the equilibrium moisture is called the __________ moisture.
The McCabe Δ L law states that the
Ordinary diffusion process is also called __________ diffusion.
To increase the absorption factor, (where, G = gas flow rate, S = solvent flow rate)
Fenske's equation for determining the minimum number of theoretical stages in distillation column holds good, when the
Stefan's law describes the mass transfer by
Which of the following plays an important role in problems of simultaneous heat and mass transfer ?
The term "cooling range" in a cooling tower refers to the difference in the temperature of
Physical absorption is
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