Use of natural draft cooling tower is practised, when the air has low

The fixed cost of a distillation column at minimum reflux ratio is

Design calculation for multiple component distillation is done by

Mass transfer co-efficient is directly proportional to D_AB^0.5, according to __________ theory.

In a packed bed absorption column, the channelling will be noted by the

Sand is dried in foundaries in a___drier.

If R_m is the minimum reflux ratio, the optimum reflux ratio may be around __________ R_m.

Prandtl number for water at 20°C is about

Gaseous diffusivity at atmospheric pressure is of the order of __________ cm²/second.

In liquid-liquid extraction, the number of phases at plait point is

The falling rate period in the drying of a solid is characterised by

The rate of mass transfer is not dependent upon the

Pressure drop through plate tower as compared to that through packed tower, for the same duty will be

Boiling point diagram is

Pick out the wrong statement.

The cooling effect in a cooling tower can not be increased by

Which of the following employs an accessory known as 'drift eliminator' ?

During dehumidification of unsaturated air wet bulb temperature & partial pressure of vapor are not constant. However, during evaporative cooling process with recirculated water supply, the __________ remains constant.

Pick out the wrong statement:

In a liquid-liquid extraction,kg of a solution containing 2 kg of solute C and 8 kg of solvent A is brought into contact withkg of solvent B. Solvent A and B are completely immiscible in each other whereas solute C is soluble in both the solvents. The extraction process attains equilibrium. The equilibrium relationship between the two phases is Y^* = 0.9X, where Y^* is the kg of C/kg of B and X is kg of C/kg of A. Choose the correct answer.

In gas-liquid contact operation, the number of ideal stages, . This is true when the stripping factor 'S' is

In which of the following unit operations, the selectivity is an important parameter ?

In gas-liquid contact operation, the number of ideal stages, . This is true when the stripping factor 'S' is

Dimension of mass diffusivity is the same as that of

When acetone is added in a two layer mixture of methyl isobutyl ketone and water at 30°C, the acetone distributes between the two layers and the composition of the layer follows two solubility curves. For this system,

Steam distillation is used to

For continuous drying of grannular or crystalline material, the dryer used is the __________ dryer.

For contacting a highly soluble gas with a liquid

The relative volatility of a binary mixture at the azeotropic composition is

The value of N_A/(N_A + N_B) for steady state molecular diffusion of gas 'A' through non-diffusing gas 'B' is

Pick out the correct statement.

In case of absorption, both the operating and equilibrium lines will be straight for

In a vapor-liquid contacting equipment, the overall gas phase mass transfer co-efficient (M.T.C), K_G is related to individual co-efficients (K_G and K_L) as

The surface renewal frequency in Danckwerts' model of mass transfer is given by (K_L: mass transfer co-efficient)

Which of the following is an undesirable characteristic for the solvent used in gas absorption ?

Dorr thickener is an equipment used for

Freundlich equation applies to the adsorption of solute from

When adsorption hysteresis is observed, the desorption equilibrium pressure is __________ that obtained by adsorption.

During drying operation, it is easier to remove the __________ moisture.

With increase in solvent rate, the number of transfer units, N_toG, for a fixed degree of absorption from a fixed amount of gas

Relative volatility varies with the concentration of component for an ideal solution. The relative volatity of a binary mixture may be defined as the ratio of vapor pressure of component 'A' to that of component 'B', when

The humid volume may be increased by increasing the

Pick out the correct statement.

Mass transfer co-efficient varies as D_AB^0.5, according to the __________ theory.

Which of the following has the same dimension as mass diffusivity ?

Which of the following equipments is not used for liquid dispersion ?

Steam distillation is used to separate

For ethanol-water system, the lowering of distillate quality fromtowill cause __________ plate requirement.

Moisture in a substance exerting an equilibrium vapour pressure less than that of pure liquid at the same temperature is called the __________ moisture.

Ion exchange process is similar to