For the same process conditions, the reflux ratio of an unlagged distillation column

In saturated gas, the

With increase in absolute humidity, the dew point of an unsaturated mixture of air and water vapor (at constant pressure and temperature)

Steam distillation is used for separation of high boiling

Nitrobenzene (boiling point = 210.6°C) is steam distilled at atm pressure.Nitrobenzene will distill off __________ °C.

The relative saturation of an unsaturated mixture of gas and vapor is independent of the

With increase in the concentration of the adsorbate, the integral heat of adsorption

If the amount of the steam used in steam distillation is increased, the temperature of distillation

During the constant rate period of drying of a solid,

(N_Sh/N_Re.N_Sc) is termed in mass transfer operation as the

Refractory bricks are usually dried in a __________ dryer.

For absorbers, high pressure drop results in

An ideal tower packing should not

An alkaline solution is used to reduce the concentration of carbon dioxide in a stream fromto 0.by absorption with irreversible chemical reaction. The overall number of transfer units based on gas phase is

Equilibrium-moisture curves of different solids

In the absorption of ammonia in water, the main resistance to absorption is by the __________ phase.

__________ column is preferred to be used, when a high liquid hold up is required in a reactor for gas-liquid reaction.

The feed to fractionating column is changed from saturated vapour to saturated liquid. If the separation and reflux ratio remains unchanged, the number of ideal stages will

Rose oil is extracted from rose leaves using __________ distillation.

Pick out the wrong statement.

The adiabatic saturation curve for a vapour-gas mixture is

Small dia distillation column can be a

HETP is numerically equal to HTU, only when the operating line

In a distillation operation, what is the effect of the temperature of the reflux stream (given below) on the condenser and reboiler loads ?
Reflux conditions:
(i) Reflux stream is completely liquid and is at its bubble point.
(ii) Reflux stream is below its bubble point.

Azeotropism for ethyl alcohol-water system disappears by

Drying of refractory is normally carried out in a __________ dryer.

For absorbers, high pressure drop results in

The 'shanks system' of leaching (i.e., counter-current multiple contact leaching) is used for

Penetration model (theory) for mass transfer was enunciated by

For turbulent mass transfer in pipes, the Sherwood number depends on the Reynolds number as

At __________ reflux, theoretical number of plates in a distillation coloumn is calculated using Fenske-Underwood equation.

Raschig ring made of procelain cannot be used for treating concentrated

For a distillation column operating at minimum reflux, the

Hypersorption refers to a __________ process.

At what value of reflux ratio, number of theoretical plates in a distillation column is minimum ?

Pick out the wrong statement.

The value of N_A/(N_A + N_B), for steady state equimolal counter diffusion of two gases 'A' and 'B' is

If mass diffusivity in a mixture is equal to the thermal diffusivity, then the Lewis number is

An air-water vapour mixture has a dry bulb temperature of 60°C and a dew point temperature of 40°C. The total pressure is 101.3 kPa and the vapour pressure of water at 40°C and 60°C are 7.kPa and 19.kPa respectively.The humidity of air sample expressed as kg of water vapour/kg of dry air is

Steady state equimolal counter diffusion occurs in case of

Degree of freedom for leaching and solvent extraction process is

Heat sensitive materials with very high latent heat of vaporisation may be economically separated using

Surface renewal model of mass transfer was enunciated by

When the __________ the relative humidity of air decreases, despite an increase in the absolute humidity.

The relative humidity of air decreases in-spite of an increase in the absolute humidity, when the

Separation of a mixture of two gases by absorption in the liquid solvent depends upon the difference in their

H₂S present in naphtha reformed gas is removed by absorbing with

During constant rate drying period, vaporisation rate per unit drying surface area

A solid is being dried in the linear drying rate regime from moisture content X_o to X_F. The drying rate is zero at X = 0 and the critical moisture content is the same as the initial moisture X_o. The drying time for M = (L_s/AR_c) is (where, L = total mass of dry solid, A = total surface area for drying R_c = Constant maximum drying rate per unit area X = moisture content (in mass of water/mass of dry solids))

Batch tray dryers suffers from the disadvantage of