According to the film theory of mass transfer, the mass transfer co-efficient is proportional to (where, D = molecular diffusivity)

Unit operation involved in the prilling of urea is

Separation of the isotopes of helium for scientific investigations is done by

L/mG is the expression for

Cox chart is useful in the design of

The suitable evaporator for concentration of foaming liquids is a __________ evaporator.

Flash distillation is suitable for separating the constituents of a binary system, which

Unsaturated air (with dry bulb temperature and dew point being 35°C and 18°C respectively) is passed through a water spray chamber maintained at 15°C. The air will be cooled

The film penetration model of mass transfer was enunciated by

Molecular seives are porous

Extraction of pencillin employs a __________ extraction coloumn.

Dew point of an air-water vapor mixture

The ratio of Murphree plate efficiency to point efficiency is always > 1 in a __________ flow model.

The ratio of Murphree plate efficiency to point efficiency is 1 in a __________ flow model.

The process employing desorption of the absorbed solute by a solvent is called

The most economical range of absorption factor is

In case of gases, the binary diffusivity is proportional to (where, P = pressure)

Tea percolation employs

The rough value of diffusion co-efficient of water vapor into air at 25°C may be about __________ cm²/sec.

Channelling is most severe

Molecular diffusion is caused by the

CO₂ can be absorbed by

When the gas to be dissolved in liquid is a/an __________ then normally co-current adsorber are used.

Moisture in a solid exerting an equilibrium vapour pressure equal to that of the pure liquid at the same temperature is called the __________ moisture.

At a fixed total pressure, humidity depends only on the

The Hatta number is important in

During drying of a solid, the critical moisture content increases with

Which of the following parameters remains almost constant during adiabatic saturation of unsaturated air ?

As per Gilliland's equation, the diffusivity is

For __________ drying, the effects of velocity, temperature and humidity of the gas and the thickness of the solid are the same.

Corresponding to Prandtl number in heat transfer, the dimensionless group in mass transfer is the __________ number.

Inside the distillation columns, the

When a multistage tray tower uses a minimum reflux ratio, it implies

Priming in a distillation column

The commonly used solvent in supercritical extraction is

Coffee is prepared from coffee beans by leaching with

Pick out the wrong statement.

What is the degree of freedom of an absorption process in which only one component is transferred between phases ?

If a two phase system is in physical equilibrium; then it means that, the

When the psychometric ratio is __________ then the adiabatic saturation temperature and wet bulb temperature becomes equal.

Flash distillation is

When the liquid over a plate is of uniform concentration, then

Gaseous diffusion co-efficient increases with increase in the

A mixture ofC₆H₆ vapour in air at 25°C andmm Hg has a dew point of 20°C. Its dew point at 30°C andmm Hg will be around __________ °C.

Which of the following is not fixed by the process requirements, in the design of absorbers ?

Sticky material can be dried in a __________ dryer.

Langmuir equation is associated with

McCabe-Thiele method of binary distillation does not assume that the

Desirable value of absorption factor in an absorber is

__________ developed the film theory.