A. Decreasing the total pressure

B. Increasing the liquid film co-efficient

C. Increasing the total pressure

A. Gas side mass transfer co-efficient should be increased

B. Mass transfer co-efficient must be kept constant

C. Liquid side mass transfer co-efficient should be decreased

A. 4

C. 2

D. 3

A. Gas film

C. Liquid-gas interface

D. None of these

A. Inversely proportional to P

B. Directly proportional to T1.5

C. Dependent on the molecular volume & molecular weight of components

A. Evaporation

B. Absorption

C. Distillation

A. Critical

B. None of these

D. Unbound

A. l column, in case of liquid-liquid extraction

B. reases for a given L/V ratio

C. Natural draft cooling towers are made of ferroconcrete and its cross-section is wider at the

E. The extraction per unit of total height for a short packed column is more effective than for a

F. With decrease in feed temperature, the number of plates required for binary distillation

A. reases, in case of gas absorption process

B. When the concentration difference for the mass transfer becomes zero at the bottom of the gas

D. io is also large in case of a counter current gas absorption tower

E. The average distance between the operating line and equilibrium line is large, when the liquidgas

F. orption tower, then the upper end of the operating line touches the equilibrium curve

A. Diffusion

C. Both A. and B.

D. Neither A. nor B.

B. Nature of the solid

C. Temperature

D. Nature of the moisture

A. X/(1 X)

B. (1 + X)/X

D. (1 X)/X

A. 1

B. < 1

C. 0

B. Fractional crystallisation

C. Evaporation

D. Liquid extraction

A. Dry bulb temperature

B. Dew point

C. None of these

A. Remains same

B. Increases

D. Either A. or B., depends on the system

A. None of these

C. Not affected by the temperature

D. Affected much less by temperature than that for gases

A. 1

B. < 1

D. 0

A. T1-Wet bulb temp; T2-Dry bulb temp; T3-Dew point temp

B. T1-Dew point temp; T2-Wet bulb temp; T3-Dry bulb temp

D. T1-Dew point temp; T2-Dry bulb temp; T3-Wet bulb temp

A. Operating line lies above the equilibrium line

B. Operating line lies below the equilibrium line

D. Pressure drop in the column is very high

A. Unsaturated surface

B. Constant rate

D. Neither A. nor B.

A. Have large surface area per unit volume

B. Have large free cross-section

C. Have low weight per unit volume

A. Recovery of tannis from the tree barks and woods

B. Leaching sodium nitrate from Chilean nitrate bearing rock

D. Neither A. nor B.

A. Dry bulb

B. None of these

C. Dew point

A. Pressure rises

C. Temperature falls

D. Pressure falls

A. For identical gas flow rates, less pressure drop occurs through a plate tower than through a

B. Plate column can handle greater liquid loads without flooding than packed column, but the

C. ked tower

E. uid hold up is more in the case of plate column

F. For the same duty, plate columns weigh less than packed columns

A. The binary diffusivity in liquids is of the order of 10-5 cm2/sec

B. cess

C. w of a gas through a given capillary

D. According to Poiseuilles law, the permeability decreases with increase in temperature for

F. Particles movement from higher concentration to lower concentration takes place in diffusion

A. Tunnel dryer

C. Spouted bed dryer

D. Pan open to atmosphere

A. < 1

B. 0.5

C. 1

B. Remains same

C. Increases

D. Either A. or B., depends on the system

A. Tower cross-section

C. Condenser and reboiler surfaces

D. None of these

A. Momentum diffusivity to thermal diffusivity

B. Mass diffusivity to momentum diffusivity

C. None of these

A. Nsc = 2

B. Nst = 2

D. None of these

A. Silica gel

C. Wood charcoal

D. Activated clay

A. Solid dispersed in liquid

B. Gas dispersed in liquid

D. Liquid dispersed in gas

A. Degree of turbulence

C. Physical properties

D. Interfacial area

A. Highest temperatures is near the feed plate

B. Vapors are not always at their dew points

C. All A., B. and C.

A. Steam distillation

B. Liquid-liquid extraction

C. Extractive distillation

D. Leaching

A. Pressure increases gradually from bottom to the top of the column

B. None of these

C. Liquids are not always at their bubble points

A. Relative humidity of outlet air

B. Humidity of inlet air

C. Flow rate of inlet air

A. ution

B. Diffusion of the solute from the solution in contact with the particle to the main bulk of the

C. Phase change of the solute as it dissolves in the solvent

D. Diffusion of the solute through the solvent in the pores to the outside of the particle

A. Increase both G and S

B. Decrease both G and S

D. Increase G and decrease S

A. erally

B. In case of a packed tower, the operating velocity is about half of the flooding velocity,

C. Change in barometric pressure does not affect the relative humidity

E. idity</strong>

F. Elution means the desorption of the adsorbed solute by a solvent

A. Benzol present in coke oven gas by wash oil

C. All A., B. and C.

D. Ammonia in water

B. Increases with temperature rise

C. Increases with increase in pressure

D. Decreases with temperature rise

A. Provides poorer contact between the fluids

B. Gives lower pressure drop

D. Gives higher pressure drop

A. Viscosity

B. Density

D. Relative volatility

A. Pressure falls

C. Temperature falls

D. Pressure rises

A. II, IV

C. IV, II

D. IV, III

B. Bound moisture is removed during constant rate drying period

C. Free moisture is removed during falling rate drying period

D. The sum of free moisture and equilibrium moisture in a solid is called the critical moisture