Molecular distillation is
Molecular distillation is
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Pick out the wrong statement
For achieving rapid drying rate in a spray dryer, the diameter of the particles in the feed should be in the range of __________ microns (1 mm = 1000 microns).
For achieving rapid drying rate in a spray dryer, the diameter of the particles in the feed should be in the range of __________ microns (1 mm = 1000 microns).
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Pick out the wrong statement.
If the solubilities of different components (in a liquid-liquid extraction system) increase with rise in temperature, then the temperature above which they dissolve completely is known as the critical solution temperature (CST or consolute temperature). If solubilities increase with decrease in temperature, then CST is the temperature below which they dissolve completely. If a binary system has no critical solution temperature, it implies that
If the solubilities of different components (in a liquid-liquid extraction system) increase with rise in temperature, then the temperature above which they dissolve completely is known as the critical solution temperature (CST or consolute temperature). If solubilities increase with decrease in temperature, then CST is the temperature below which they dissolve completely. If a binary system has no critical solution temperature, it implies that
The dew point of a saturated gas phase equals the __________ temperature.
The dew point of a saturated gas phase equals the __________ temperature.
L/mG is the expression for
L/mG is the expression for
Penetration theory relates the average mass transfer co-efficient (K) with diffusivity (D) as
Penetration theory relates the average mass transfer co-efficient (K) with diffusivity (D) as
In stripping section of continuous distillation column, the
In stripping section of continuous distillation column, the
The change in enthalpy per unit weight of adsorbed gas when adsorbed on gas free or "outgassed" adsorbent to from a definite concentration of adsorbate is called its
The change in enthalpy per unit weight of adsorbed gas when adsorbed on gas free or "outgassed" adsorbent to from a definite concentration of adsorbate is called its
Can the efficiency of a plate in the distillation tower be greater than 100%?
Can the efficiency of a plate in the distillation tower be greater than 100%?
As the reflux ratio increases, the slope of the operating line for rectifying section
As the reflux ratio increases, the slope of the operating line for rectifying section
Acetic acid will be most economically separated from a dilute solution of acetic acid in water by
Acetic acid will be most economically separated from a dilute solution of acetic acid in water by
In a solution containing 0.30 Kg mole of solute and 600 kg of solvent, the molality is
In a solution containing 0.30 Kg mole of solute and 600 kg of solvent, the molality is
Selectivity of the solvent used in solvent extraction should be
Selectivity of the solvent used in solvent extraction should be
Which of the following is the most commonly used leaching solvent in vegetable oil industry?
Which of the following is the most commonly used leaching solvent in vegetable oil industry?
If the path of liquid across the plate is very long as in case of large diameter tower, Murphree efficiency can be __________ percent.
If the path of liquid across the plate is very long as in case of large diameter tower, Murphree efficiency can be __________ percent.
'ADDUCTS' and 'CLATHRATES' are used in case of
'ADDUCTS' and 'CLATHRATES' are used in case of
When the liquid phase and vapour phase of a binary system obeys Raoult's and Dalton's law respectively, the relative volatility is the ratio of
When the liquid phase and vapour phase of a binary system obeys Raoult's and Dalton's law respectively, the relative volatility is the ratio of
__________ columns are used for liquid dispersion in a continuous gas phase.
__________ columns are used for liquid dispersion in a continuous gas phase.
Dorr thickener is an equipment used for
Dorr thickener is an equipment used for
The amount of steam required per unit quantity of distillate in case of steam distillation will be reduced by
The amount of steam required per unit quantity of distillate in case of steam distillation will be reduced by
Langmuir equation is associated with
Langmuir equation is associated with
With increase in solvent rate, the number of transfer units, NtoG, for a fixed degree of absorption from a fixed amount of gas
With increase in solvent rate, the number of transfer units, NtoG, for a fixed degree of absorption from a fixed amount of gas
In case of non-ideal gases and liquids, the molal diffusivity
In case of non-ideal gases and liquids, the molal diffusivity
The slope of 9-line is determined by the
The slope of 9-line is determined by the
The vapour pressure exerted by the moisture contained in a wet solid depends upon the
The vapour pressure exerted by the moisture contained in a wet solid depends upon the
Occurrence of 'case hardening' during drying of a high moisture solid cake __________ the drying rate.
Occurrence of 'case hardening' during drying of a high moisture solid cake __________ the drying rate.
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Pick out the wrong statement.
In case of liquid-liquid binary diffusion, diffusivity of one constituent into another is not dependent on the
In case of liquid-liquid binary diffusion, diffusivity of one constituent into another is not dependent on the
A binary mixture of benzene and cyclohexane is separated by
A binary mixture of benzene and cyclohexane is separated by
In case of steam distillation, the steam leaving the liquid is not completely saturated with distillate vapour, because
In case of steam distillation, the steam leaving the liquid is not completely saturated with distillate vapour, because
Boiling point diagram is not affected by the ambient
Boiling point diagram is not affected by the ambient
Desulphurisation of petrol is done in a
Desulphurisation of petrol is done in a
Positive deviation from Raoult's law means a mixture whose total pressure is
Positive deviation from Raoult's law means a mixture whose total pressure is
The velocity, concentration and temperature boundary, for the boundary layer development on a flat plate during connective mass transfer will be same, if
The velocity, concentration and temperature boundary, for the boundary layer development on a flat plate during connective mass transfer will be same, if
Pore size of the molecular seive 5A is __________ mm.
Pore size of the molecular seive 5A is __________ mm.
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Pick out the wrong statement.
Which of the following operations does not involve leaching?
Which of the following operations does not involve leaching?
Absorption factor is defined as (where, S₁ = slope of the operating line S₂ = slope of the equilibrium curve)
Absorption factor is defined as (where, S₁ = slope of the operating line S₂ = slope of the equilibrium curve)
1 kg of a saturated aqueous solution of a highly soluble component A at 60°C is cooled to 25°C. The solubility limits of A are (0.6 kgA/kg water) at 60°C and (0.2 kgA/kg water) at 25°C. The amount in kg of the crystals formed is
1 kg of a saturated aqueous solution of a highly soluble component A at 60°C is cooled to 25°C. The solubility limits of A are (0.6 kgA/kg water) at 60°C and (0.2 kgA/kg water) at 25°C. The amount in kg of the crystals formed is
In case of gases, the binary diffusivity is proportional to (where, P = pressure)
In case of gases, the binary diffusivity is proportional to (where, P = pressure)
As the reflux ratio in a distillation coloumn is increased from the minimum, the
As the reflux ratio in a distillation coloumn is increased from the minimum, the
Which is the controlling factor for a drum drier?
Which is the controlling factor for a drum drier?
As the reflux ratio, in a continuous counter-current extraction is increased, the number of stages
As the reflux ratio, in a continuous counter-current extraction is increased, the number of stages
Large scale drying of sugar is done in a __________ dryer.
Large scale drying of sugar is done in a __________ dryer.
Low viscosity absorbent is preferred for reasons of
Low viscosity absorbent is preferred for reasons of
Which of the following plays an important role in problems of simultaneous heat and mass transfer?
Which of the following plays an important role in problems of simultaneous heat and mass transfer?
In case of absorption & stripping, the interface of the liquid & gas phases are present in equilibrium, when the diffusional resistance of __________ is zero.
In case of absorption & stripping, the interface of the liquid & gas phases are present in equilibrium, when the diffusional resistance of __________ is zero.
The individual mass transfer co-efficients (moles/m² . s) for absorption of a solute from a gas mixture into a liquid solvent are, KL = 4.5 and KG = 1.5. The slope of the equilibrium line is 3. Which of the following resistance (s) is (are) controlling ?
The individual mass transfer co-efficients (moles/m² . s) for absorption of a solute from a gas mixture into a liquid solvent are, KL = 4.5 and KG = 1.5. The slope of the equilibrium line is 3. Which of the following resistance (s) is (are) controlling ?
The falling rate period in the drying of a solid is characterised by
The falling rate period in the drying of a solid is characterised by
The main reason for dividing a tall packed tower into series of small towers is to
The main reason for dividing a tall packed tower into series of small towers is to
With increase in temperature, the leaching rate increases due to
With increase in temperature, the leaching rate increases due to
Separation of two volatile liquids by distillation makes use of their
Separation of two volatile liquids by distillation makes use of their
Which of the following remains constant during sensible cooling process ?
Which of the following remains constant during sensible cooling process ?
Minimum possible diameter of a packed coloumn is decided mainly by the
Minimum possible diameter of a packed coloumn is decided mainly by the
Azeotropic distillation is employed to separate
Azeotropic distillation is employed to separate
In distillation, overhead product contains
In distillation, overhead product contains
(NSh/NRe.NSc) is termed in mass transfer operation as the
(NSh/NRe.NSc) is termed in mass transfer operation as the
When a multistage tray tower uses a minimum reflux ratio, it implies
When a multistage tray tower uses a minimum reflux ratio, it implies
With increase in gas rate, the number of transfer units, NtoG, for a fixed degree of absorption by a fixed amount of solvent
With increase in gas rate, the number of transfer units, NtoG, for a fixed degree of absorption by a fixed amount of solvent
McCabe-Thiele method
McCabe-Thiele method
Which of the following parameters remains constant during chemical dehumidifica-tion?
Which of the following parameters remains constant during chemical dehumidifica-tion?
During bottling of cold drinks (e.g. Pepsi), the main resistance to mass transfer for the absorption of carbon dioxide in water lies in the
During bottling of cold drinks (e.g. Pepsi), the main resistance to mass transfer for the absorption of carbon dioxide in water lies in the
For which of the following unit operations, Lewis number is of significance?
For which of the following unit operations, Lewis number is of significance?
Water-ethyl alcohal solution can be concentrated (in respect of alcohal concentration) by __________ distillation.
Water-ethyl alcohal solution can be concentrated (in respect of alcohal concentration) by __________ distillation.
In the desorption of highly soluble gas from the liquid, the main resistance will be in the __________ phase.
In the desorption of highly soluble gas from the liquid, the main resistance will be in the __________ phase.
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
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
In triangular co-ordinates, the ternery composition point falls __________ of the triangle.
In triangular co-ordinates, the ternery composition point falls __________ of the triangle.
Lewis number, which is important in problems involving simultaneous heat and mass transfer, is the ratio of
Lewis number, which is important in problems involving simultaneous heat and mass transfer, is the ratio of
In case of absorption, both the operating and equilibrium lines will be straight for
In case of absorption, both the operating and equilibrium lines will be straight for
The McCabe Δ L law states that the
The McCabe Δ L law states that the
The apex of an equilateral-triangular coordinate (in ternary liquid system) represents a/an
The apex of an equilateral-triangular coordinate (in ternary liquid system) represents a/an
In rectifying section of a continuous distillation column, the
In rectifying section of a continuous distillation column, the
A solid material shows case hardening properties while drying. Which of the following should be controlled to control the drying process?
A solid material shows case hardening properties while drying. Which of the following should be controlled to control the drying process?
Large scale drying of wheat is done in a __________ dryer.
Large scale drying of wheat is done in a __________ dryer.
For the same process conditions, the reflux ratio of an unlagged distillation column
For the same process conditions, the reflux ratio of an unlagged distillation column
Air at a particular humidity is heated in a furnace. The new dew point
Air at a particular humidity is heated in a furnace. The new dew point
Which of the following is not a continuous drier?
Which of the following is not a continuous drier?
The slope of the operating line for a single component co-current absorber when plotted in terms of mole ratio units is
The slope of the operating line for a single component co-current absorber when plotted in terms of mole ratio units is
Ordinary diffusion process is also called __________ diffusion.
Ordinary diffusion process is also called __________ diffusion.
Decoction refers to the use of solvent
Decoction refers to the use of solvent
A minimum boiling azeotrope is exemplified by
A minimum boiling azeotrope is exemplified by
H₂S is being absorbed in a gas absorber unit. The height of the transfer unit based on the overall mass transfer coefficient on the gas side is 0.4 m. The equilibrium data is given by, y = 1.5 x. The bulk concentration of H₂S has to be reduced from 0.05 to 0.001 mole fraction in the gas side. The height of the tower (in metres) corresponding to an operating line given by, y = 5x + 0.001 is
H₂S is being absorbed in a gas absorber unit. The height of the transfer unit based on the overall mass transfer coefficient on the gas side is 0.4 m. The equilibrium data is given by, y = 1.5 x. The bulk concentration of H₂S has to be reduced from 0.05 to 0.001 mole fraction in the gas side. The height of the tower (in metres) corresponding to an operating line given by, y = 5x + 0.001 is
In most of the vacuum crystalliser, vacuum is generally produced by means of a
In most of the vacuum crystalliser, vacuum is generally produced by means of a
The equipment frequently used for adiabatic humidification-cooling operation with recirculating liquid is
The equipment frequently used for adiabatic humidification-cooling operation with recirculating liquid is
Molecular diffusion is caused by the
Molecular diffusion is caused by the
In the layout plan for a vacuum distillation unit, operating at 60 mm Hg, supported by a barometric condenser, the appropriate place for the location of vacuum drum for collecting the distillate will be
In the layout plan for a vacuum distillation unit, operating at 60 mm Hg, supported by a barometric condenser, the appropriate place for the location of vacuum drum for collecting the distillate will be
With decrease in the throughput (compared with the design capacity) for a bubble cap distillation column, its efficiency
With decrease in the throughput (compared with the design capacity) for a bubble cap distillation column, its efficiency
Which one of the following devices is not used for both the absorption as well as the liquid-liquid extraction processes?
Which one of the following devices is not used for both the absorption as well as the liquid-liquid extraction processes?
Lewis number (Le) is
Lewis number (Le) is
The relative saturation of an unsaturated mixture of gas and vapor is independent of the
The relative saturation of an unsaturated mixture of gas and vapor is independent of the
__________ is concerned with the adsorption equilibria.
__________ is concerned with the adsorption equilibria.
The efficiency of a plate column will be maximum, when the flow is ideal __________ the plate.
The efficiency of a plate column will be maximum, when the flow is ideal __________ the plate.
Which of the following is an undesirable characteristic for the solvent used in gas absorption?
Which of the following is an undesirable characteristic for the solvent used in gas absorption?
Total reflux in a distillation operation requires minimum
Total reflux in a distillation operation requires minimum
Molecular seives are porous
Molecular seives are porous
The cooling effect in a cooling tower can be speeded up by
The cooling effect in a cooling tower can be speeded up by
Heat in BTU necessary to increase the temperature of 1 lb of gas and its accompanying vapour by 1°F is called the
Heat in BTU necessary to increase the temperature of 1 lb of gas and its accompanying vapour by 1°F is called the
Pick out the wrong statement.
Pick out the wrong statement.
