In case of unsaturated air
In case of unsaturated air
For __________ drying, the effects of velocity, temperature and humidity of the gas and the thickness of the solid are the same.
For __________ drying, the effects of velocity, temperature and humidity of the gas and the thickness of the solid are the same.
In case of __________ distillation, a solvent is added to alter the relative volatility of the mixture to be separated.
In case of __________ distillation, a solvent is added to alter the relative volatility of the mixture to be separated.
__________ extractor uses centrifugal force for separating the two phases.
__________ extractor uses centrifugal force for separating the two phases.
According to the Fenske equation, what will be the minimum number of plates required in a distillation column to separate an equimolar binary mixture of components A and B into an overhead fraction containing 99 mol% A and a bottom fraction containing 98 mol% B? Assume that relative volatility (αAB = 2) does not change appreciably in the coloumn.
According to the Fenske equation, what will be the minimum number of plates required in a distillation column to separate an equimolar binary mixture of components A and B into an overhead fraction containing 99 mol% A and a bottom fraction containing 98 mol% B? Assume that relative volatility (αAB = 2) does not change appreciably in the coloumn.
In case of physical adsorption, the difference between heat of adsorption and heat of normal condensation is
In case of physical adsorption, the difference between heat of adsorption and heat of normal condensation is
For a binary mixture with low relative volatility, continuous rectification to get pure products will require
For a binary mixture with low relative volatility, continuous rectification to get pure products will require
Flash distillation is
Flash distillation is
For contacting a highly soluble gas with a liquid
For contacting a highly soluble gas with a liquid
Schimdt number and Lewis number for pure air at atmospheric conditions are respectively
Schimdt number and Lewis number for pure air at atmospheric conditions are respectively
A packed tower compared to a plate tower for a particular mass transfer operation
A packed tower compared to a plate tower for a particular mass transfer operation
The relative humidity of air decreases in-spite of an increase in the absolute humidity, when the
The relative humidity of air decreases in-spite of an increase in the absolute humidity, when the
Mechanism of moisture removal in case of freeze drying of food stuff is by
Mechanism of moisture removal in case of freeze drying of food stuff is by
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,
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,
The Kundsen diffusivity is proportional to (where, T = absolute temperature)
The Kundsen diffusivity is proportional to (where, T = absolute temperature)
In a single stage extraction process, 10 kg of pure solvent S (containing no solute A) is mixed with 30 kg of feed F containing A at a mass fraction xf = 0.2. The mixture splits into an extract phase E and a raf-finate phase R containing A at xB = 0.5 and xR = 0.05 respectively. The total mass of the extract phase is (in Kg)
In a single stage extraction process, 10 kg of pure solvent S (containing no solute A) is mixed with 30 kg of feed F containing A at a mass fraction xf = 0.2. The mixture splits into an extract phase E and a raf-finate phase R containing A at xB = 0.5 and xR = 0.05 respectively. The total mass of the extract phase is (in Kg)
Heat load in a cooling tower
Heat load in a cooling tower
Stacked packing compared to dumped packing
Stacked packing compared to dumped packing
Solvent extraction is the terminology applied to the liquid-liquid extraction, which is preferred for the separation of the components of liquids, when
Solvent extraction is the terminology applied to the liquid-liquid extraction, which is preferred for the separation of the components of liquids, when
Steady state temperature reached by a small amount of liquid evaporating into a large amount of unsaturated vapour-gas mixture is called the __________ temperature.
Steady state temperature reached by a small amount of liquid evaporating into a large amount of unsaturated vapour-gas mixture is called the __________ temperature.
Batch tray dryers suffers from the disadvantage of
Batch tray dryers suffers from the disadvantage of
Absorption accompanied with chemical reaction is exemplified by the absorption of
Absorption accompanied with chemical reaction is exemplified by the absorption of
Which of the following psychrometric processes is followed by water vapour laden unsaturated air, when it is passed through solid or liquid adsorbent?
Which of the following psychrometric processes is followed by water vapour laden unsaturated air, when it is passed through solid or liquid adsorbent?
To remove all the moisture from a wet solid it requires exposure to __________ air.
To remove all the moisture from a wet solid it requires exposure to __________ air.
The Knudsen diffusivity is dependent on the
The Knudsen diffusivity is dependent on the
If the overall efficiency and Murphree plate efficiency are equal, then both the equilibrium and operating lines are
If the overall efficiency and Murphree plate efficiency are equal, then both the equilibrium and operating lines are
Rate of leaching increases with increasing
Rate of leaching increases with increasing
Azeotropism for ethyl alcohol-water system disappears by
Azeotropism for ethyl alcohol-water system disappears by
__________ number indicates the ratio of the rates of the heat and mass transfer incase of a cooling tower.
__________ number indicates the ratio of the rates of the heat and mass transfer incase of a cooling tower.
In liquid-liquid extraction, the number of phases at plait point is
In liquid-liquid extraction, the number of phases at plait point is
Water entrained by circulating air in cooling towers is termed as
Water entrained by circulating air in cooling towers is termed as
If a₁ and a₂ are the relative volatilities when the pressure in the distillation column is 1 and 2 atm respectively. Pick out the correct statement.
If a₁ and a₂ are the relative volatilities when the pressure in the distillation column is 1 and 2 atm respectively. Pick out the correct statement.
Mass transfer co-efficient is defined as
Mass transfer co-efficient is defined as
Pick out the wrong statement.
Pick out the wrong statement.
In a binary distillation column, if the feed contains 40 mole % vapour, the q line will have a slope of
In a binary distillation column, if the feed contains 40 mole % vapour, the q line will have a slope of
Steady state equimolal counter diffusion is encountered in
Steady state equimolal counter diffusion is encountered in
For the same feed, feed quality and separation (in a distillation column), with the increase of total pressure, the number of ideal plates will
For the same feed, feed quality and separation (in a distillation column), with the increase of total pressure, the number of ideal plates will
The commonly used solvent in supercritical extraction is
The commonly used solvent in supercritical extraction is
A plait point is the point on the solubility curve, where the tie line reduces to a point. What is the number of plait point for a ternery system containing twopairs of partially miscible liquids?
A plait point is the point on the solubility curve, where the tie line reduces to a point. What is the number of plait point for a ternery system containing twopairs of partially miscible liquids?
Weeping in a distillation column
Weeping in a distillation column
Antibiotics are best handled in a
Antibiotics are best handled in a
__________ is the separation technique used for desalination of sea water.
__________ is the separation technique used for desalination of sea water.
Fractional solvent extraction
Fractional solvent extraction
Pick out the wrong statement.
Pick out the wrong statement.
Fenske equation determines the
Fenske equation determines the
Humidification involves mass transfer between a pure liquid phase and a fixed gas, which is
Humidification involves mass transfer between a pure liquid phase and a fixed gas, which is
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
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
A 25 cm x 25 cm x 1 cm flat sheet weighing 1.2 kg initially was dried from both sides under constant drying rate conditions. It took 1500 seconds for the weight of the sheet to reduce to 1.05 kg. Another 1m x 1m x 1cm flat sheet of the same material is to be dried from one side only.Under the same constant drying rate conditions, the time required for drying (in seconds) from its initial weight of 19.2 kg to 17.6 kg is
A 25 cm x 25 cm x 1 cm flat sheet weighing 1.2 kg initially was dried from both sides under constant drying rate conditions. It took 1500 seconds for the weight of the sheet to reduce to 1.05 kg. Another 1m x 1m x 1cm flat sheet of the same material is to be dried from one side only.Under the same constant drying rate conditions, the time required for drying (in seconds) from its initial weight of 19.2 kg to 17.6 kg is
In azeotropic mixture, the equilibrium vapour composition is
In azeotropic mixture, the equilibrium vapour composition is
Pick out the correct statement.
Pick out the correct statement.
Drying of refractory is normally carried out in a __________ dryer.
Drying of refractory is normally carried out in a __________ dryer.
Pick out the wrong statement.
Pick out the wrong statement.
Rayleigh's equation applies to __________ distillation.
Rayleigh's equation applies to __________ distillation.
Priming in a distillation column
Priming in a distillation column
In gas-liquid contact operation, the number of ideal stages, N = (xa - xb)/(xb - x*b) . This is true when the stripping factor 'S' is
In gas-liquid contact operation, the number of ideal stages, N = (xa - xb)/(xb - x*b) . This is true when the stripping factor 'S' is
The wet and 'dry bulb temperature for a vapour-gas mixture are 25°C and 30°C respectively. If the mixture is heated to 45°C at constant pressure, the wet bulb temperature will be __________ °C.
The wet and 'dry bulb temperature for a vapour-gas mixture are 25°C and 30°C respectively. If the mixture is heated to 45°C at constant pressure, the wet bulb temperature will be __________ °C.
An alkaline solution is used to reduce the concentration of carbon dioxide in a stream from 10% to 0.1% by absorption with irreversible chemical reaction. The overall number of transfer units based on gas phase is
An alkaline solution is used to reduce the concentration of carbon dioxide in a stream from 10% to 0.1% by absorption with irreversible chemical reaction. The overall number of transfer units based on gas phase is
Large scale usage of flash distillation is practised in
Large scale usage of flash distillation is practised in
As complete saturation of an adsorbent is approached, the differential heat of adsrop-tion approaches
As complete saturation of an adsorbent is approached, the differential heat of adsrop-tion approaches
Nitrobenzene (boiling point = 210.6°C) is steam distilled at 1 atm pressure.Nitrobenzene will distill off __________ °C.
Nitrobenzene (boiling point = 210.6°C) is steam distilled at 1 atm pressure.Nitrobenzene will distill off __________ °C.
Which of the following has the same dimension as mass diffusivity?
Which of the following has the same dimension as mass diffusivity?
Pick out the wrong statement pertaining to the rotary dryer.
Pick out the wrong statement pertaining to the rotary dryer.
The caking of crystals can be prevented by
The caking of crystals can be prevented by
Pick out the wrong statement.
Pick out the wrong statement.
Which of the following quantities need not be fixed before starting the design of a co-current absorber?
Which of the following quantities need not be fixed before starting the design of a co-current absorber?
At constant pressure, with increase of temperature, the dew point will
At constant pressure, with increase of temperature, the dew point will
During drying operation, it is easier to remove the __________ moisture.
During drying operation, it is easier to remove the __________ moisture.
Ammonia present in the coke oven gas is removed by washing with
Ammonia present in the coke oven gas is removed by washing with
Hypersorption refers to a __________ process.
Hypersorption refers to a __________ process.
For a binary mixture distillation process, the degree of freedom is 2. However, if the pressure is fixed in this process, the number of independent variables in this process will be
For a binary mixture distillation process, the degree of freedom is 2. However, if the pressure is fixed in this process, the number of independent variables in this process will be
The critical moisture content in case of drying indicates the __________ rate period.
The critical moisture content in case of drying indicates the __________ rate period.
Steady state equimolal counter diffusion occurs in case of
Steady state equimolal counter diffusion occurs in case of
At __________ reflux, theoretical number of plates in a distillation coloumn is calculated using Fenske-Underwood equation.
At __________ reflux, theoretical number of plates in a distillation coloumn is calculated using Fenske-Underwood equation.
In steam distillation, the
In steam distillation, the
When the solvent dissolves very little of solute, then
When the solvent dissolves very little of solute, then
Henry's law states that the
Henry's law states that the
In saturated gas, the
In saturated gas, the
Leaching rate is independent of the
Leaching rate is independent of the
Flooding results in
Flooding results in
Flooding in a column results due to
Flooding in a column results due to
The term "cooling range" in a cooling tower refers to the difference in the temperature of
The term "cooling range" in a cooling tower refers to the difference in the temperature of
In case of absorption with exothermic reaction, for fluids having
In case of absorption with exothermic reaction, for fluids having
Diameter to height ratio for a rashig ring is
Diameter to height ratio for a rashig ring is
An ideal tower packing should not
An ideal tower packing should not
The binary diffusivity in gases does not depend upon the
The binary diffusivity in gases does not depend upon the
In a binary system, separation is very efficient, when the relative volatility is
In a binary system, separation is very efficient, when the relative volatility is
The solvent used in liquid-liquid extraction should have __________ less than one.
The solvent used in liquid-liquid extraction should have __________ less than one.
As the reflux ratio decreases, the
As the reflux ratio decreases, the
Ion exchange process is similar to
Ion exchange process is similar to
For a distillation column operating at minimum reflux, the
For a distillation column operating at minimum reflux, the
With increase in the concentration of the adsorbate, the integral heat of adsorption
With increase in the concentration of the adsorbate, the integral heat of adsorption
Flash distillation is suitable for separating the constituents of a binary system, which
Flash distillation is suitable for separating the constituents of a binary system, which
Gaseous diffusion co-efficient increases with increase in the
Gaseous diffusion co-efficient increases with increase in the
Separation of the isotopes of helium for scientific investigations is done by
Separation of the isotopes of helium for scientific investigations is done by
The term "approach" in a cooling tower refers to the difference in the temperature of the
The term "approach" in a cooling tower refers to the difference in the temperature of the
Steam distillation is used for separation of high boiling
Steam distillation is used for separation of high boiling
For turbulent mass transfer in pipes, the Sherwood number depends on the Reynolds number as
For turbulent mass transfer in pipes, the Sherwood number depends on the Reynolds number as
The Reynolds number of the liquid was increased 100 fold for a laminar falling film used for gas-liquid contacting. Assuming penetrating theory is applicable, the fold increase in the mass transfer co-efficient (Kc) for the same sytem is
The Reynolds number of the liquid was increased 100 fold for a laminar falling film used for gas-liquid contacting. Assuming penetrating theory is applicable, the fold increase in the mass transfer co-efficient (Kc) for the same sytem is
If the amount of the steam used in steam distillation is increased, the temperature of distillation
If the amount of the steam used in steam distillation is increased, the temperature of distillation
Make up water is supplied during cooling tower operation to compensate for water losses due to
Make up water is supplied during cooling tower operation to compensate for water losses due to
