In a moderately sized packed absorption tower, channeling (which is most severe with stacked packings) can be minimised by taking the ratio of tower diameter to packing diameter

Drift in a cooling tower is

__________ column is used in gas absorption process.

J_D factor for mass transfer is a function of Reynolds number. Mass transfer by molecular diffusion from a single drop to surrounding still air is given by

Diffusion co-efficient generally depends upon the temperature, pressure & the nature of the components of the system. Its dimension is not the same as that of the

Equilibrium moisture of a solid is equal to the total moisture minus free moisture. Which of the following substances will have maxi-mum equilibrium moisture ?

When the solvent dissolves very little of solute, then

Molality is defined as the number of gm moles of solute per __________ of solvent.

For a fixed number of ideal stages in a distillation column, as the reflux ratio is increased, the difference in composition between the top and bottom product streams

In case of unsaturated air

In extraction, as the temperature increases, the area of hetrogeneity (area covered by binodal curve)

Unit of molal diffusivity is

Components, having widely different boiling point in a binary mixture, can be separated using __________ distillation.

Pick out the wrong statement.

Flash distillation is suitable for the separation of components

__________ is concerned with the adsorption equilibria.

According to Chilton-Colburn analogy for mass transfer, N_St.N_Sc^2/3 is equal to

A pure drug is administered as a sphere and as a cube. The amount of drug is the same in the two tablets. Assuming that the shape and size do not influence the mass transfer, the ratio of rate of dissolution in water at t = 0 for the cubic to spherical tablet is

Mass transfer co-efficient 'K' according to penetration theory varies with mass dif-fusivity as

If x_D = overhead product molal composition and R_D = reflux ratio, then slope and intercept of the operating line for rectifying section are respectively

For a binary mixture with low relative volatility,

Pick out the wrong statement.

Use of packed towers for distillation is generally limited to the

Molecular distillation is

The term "approach" in a cooling tower refers to the difference in the temperature of the

As the reflux ratio, in a continuous counter-current extraction is increased, the number of stages

Which of the following equipments is not used in liquid-liquid extraction ?

In rectifying section of a continuous distillation column, the

In Mcabe-Thiele method, at infinite reflux ratio

Fractional solvent extraction

In the layout plan for a vacuum distillation unit, operating atmm Hg, supported by a barometric condenser, the appropriate place for the location of vacuum drum for collecting the distillate will be

Minimum reflux ratio in a distillation column results in

Flooding in a distillation column is detected by a sharp

Most important factor to be considered in the selection of packings for absorbers is the __________ of packing.

Plate efficiency

Absorption accompanied by heat evolution results in

In case of an unsaturated mixture of gas and vapor, the percentage saturation is __________ its relative saturation.

Pick out the wrong statement.

Drying of a wet solid under constant drying conditions means the exposure of the wet solid to the air of constant

Binary distillation involves the mass transfer by __________ at the gas-liquid interface.

In triangular co-ordinates, the ternery composition point falls __________ of the triangle.

Pick out the wrong statement.

Leaching rate is independent of the

__________ is the separation technique used for desalination of sea water.

The relative saturation of a partially saturated mixture of vapour and gas can be increased by __________ of the mixture.

Penetration theory relates the average mass transfer co-efficient (K) with diffusivity (D) as

Even though bubble cap towers are very effective for humidification operation, they are not used commonly in industries, because of the

At 750°K and 1 atm, the approximate value of Schmidt number for air is

When the solvent dissolves very little of solute, then

At constant pressure, with increase of temperature, the dew point will