Unsaturated air (with dry and wet bulb temperatures being 35 and 25°C respectively) is passed through water spray chamber maintained at 35°C. The air will be
Unsaturated air (with dry and wet bulb temperatures being 35 and 25°C respectively) is passed through water spray chamber maintained at 35°C. The air will be
If the specific heats of a gas and a vapor are 0.2KJ/Kg.°K and 1.5 KJ/Kg.°K respectively, and the humidity is 0.01; the humid heat in KJ/°Kg. is
If the specific heats of a gas and a vapor are 0.2KJ/Kg.°K and 1.5 KJ/Kg.°K respectively, and the humidity is 0.01; the humid heat in KJ/°Kg. is
CO₂ can be absorbed by
CO₂ can be absorbed by
For a single component absorber, the operating line is straight only when plotted in term of __________ units.
For a single component absorber, the operating line is straight only when plotted in term of __________ units.
Which of the following parameters remains almost constant during adiabatic saturation of unsaturated air?
Which of the following parameters remains almost constant during adiabatic saturation of unsaturated air?
Channelling is most severe
Channelling is most severe
__________ developed the film theory.
__________ developed the film theory.
The temperature of water cooled in cooling tower is always __________ temperature of entering air.
The temperature of water cooled in cooling tower is always __________ temperature of entering air.
Flooding in a vapor-liquid contacting equipment occurs in a tray, when the pressure drop through a tray is __________ the liquid head available in the downcomer.
Flooding in a vapor-liquid contacting equipment occurs in a tray, when the pressure drop through a tray is __________ the liquid head available in the downcomer.
Operating velocity in a packed tower is usually __________ the flooding velocity.
Operating velocity in a packed tower is usually __________ the flooding velocity.
A natural draft cooling tower is filled with wooden grids, which covers about __________ percent of the tower height.
A natural draft cooling tower is filled with wooden grids, which covers about __________ percent of the tower height.
Moisture in a solid exerting an equilibrium vapour pressure equal to that of the pure liquid at the same temperature is called the __________ moisture.
Moisture in a solid exerting an equilibrium vapour pressure equal to that of the pure liquid at the same temperature is called the __________ moisture.
Only small amount of evaporation of water produces large cooling effects because of its
Only small amount of evaporation of water produces large cooling effects because of its
Entrainer used in azeotropic distillation should
Entrainer used in azeotropic distillation should
In extraction, as the temperature increases, the area of hetrogeneity (area covered by binodal curve)
In extraction, as the temperature increases, the area of hetrogeneity (area covered by binodal curve)
Percentage saturation is __________ the relative saturation.
Percentage saturation is __________ the relative saturation.
Bollman extractor
Bollman extractor
In an operating distillation column, the
In an operating distillation column, the
Experiments were conducted to determine the flux of a species A in a stagnant medium across a gas-liquid interface. The overall mass transfer co-efficient based on the liquid side for dilute systems for the above was estimated to be 4 x 10⁻³ kg mole/m².s. The equilibrium data for the system is given as y = 2x. The flux across the interface (in kg mole/m² .s) for bulk concentrations of A in gas phase and liquid phase as y = 0.4 and x = 0.01 respectively is
Experiments were conducted to determine the flux of a species A in a stagnant medium across a gas-liquid interface. The overall mass transfer co-efficient based on the liquid side for dilute systems for the above was estimated to be 4 x 10⁻³ kg mole/m².s. The equilibrium data for the system is given as y = 2x. The flux across the interface (in kg mole/m² .s) for bulk concentrations of A in gas phase and liquid phase as y = 0.4 and x = 0.01 respectively is
Dry bulb temperature of the gas is __________ the wet bulb temperature.
Dry bulb temperature of the gas is __________ the wet bulb temperature.
The humid volume may be increased by increasing the
The humid volume may be increased by increasing the
If G = insoluble gas in gas stream and L = non-volatile solvent in liquid stream, then the slope of the operating line for the absorber is
If G = insoluble gas in gas stream and L = non-volatile solvent in liquid stream, then the slope of the operating line for the absorber is
At the same gas flow rate, the pressure drop in a packed tower being irrigated with liquid __________ that in dry packed tower.
At the same gas flow rate, the pressure drop in a packed tower being irrigated with liquid __________ that in dry packed tower.
Cox chart is useful in the design of
Cox chart is useful in the design of
Which of the following adsorbent is used to decolourise yellow glycerine?
Which of the following adsorbent is used to decolourise yellow glycerine?
In a packed bed absorption column, the channelling will be noted by the
In a packed bed absorption column, the channelling will be noted by the
Diameter of raschig rings used in packed tower in industry is normally around __________ inches.
Diameter of raschig rings used in packed tower in industry is normally around __________ inches.
McCabe-Thiele method of binary distillation does not assume that the
McCabe-Thiele method of binary distillation does not assume that the
Condensation of a vapour-gas mixture just begins, when (where, p = partial pressure of the vapour P = vapour pressure of the liquid )
Condensation of a vapour-gas mixture just begins, when (where, p = partial pressure of the vapour P = vapour pressure of the liquid )
NSc/NPr is called the
NSc/NPr is called the
Humid volume, at a given temperature is a/an __________ function of humidity.
Humid volume, at a given temperature is a/an __________ function of humidity.
Absorption accompanied by heat evolution results in
Absorption accompanied by heat evolution results in
When the temperature and humidity of air is low, we usually use __________ draft cooling tower.
When the temperature and humidity of air is low, we usually use __________ draft cooling tower.
In case of an unsaturated mixture of gas and vapor, the percentage saturation is __________ its relative saturation.
In case of an unsaturated mixture of gas and vapor, the percentage saturation is __________ its relative saturation.
Moisture content of a substance when at equilibrium with a given partial pressure of the vapour is called the __________ moisture.
Moisture content of a substance when at equilibrium with a given partial pressure of the vapour is called the __________ moisture.
Which of the following provides maximum contact surface for a liquid-vapour system?
Which of the following provides maximum contact surface for a liquid-vapour system?
Use of raschig rings in place of crushed stones as packing in packed beds (other things being same)
Use of raschig rings in place of crushed stones as packing in packed beds (other things being same)
A slurry is to be dried to produce flaky solid. Which dryer would you recommend?
A slurry is to be dried to produce flaky solid. Which dryer would you recommend?
For the case of flow of air past a wet bulb thermometer (air water vapour system), the approximate value of H₂/ky.Cz is around
For the case of flow of air past a wet bulb thermometer (air water vapour system), the approximate value of H₂/ky.Cz is around
The rate of solid-liquid extraction is limited by the
The rate of solid-liquid extraction is limited by the
Unsaturated air (with dry bulb and wet bulb temperatures being 45°C and 25°C respectively) is passed through a water spray chamber maintained at 23°C. The air will be cooled and
Unsaturated air (with dry bulb and wet bulb temperatures being 45°C and 25°C respectively) is passed through a water spray chamber maintained at 23°C. The air will be cooled and
Moisture in a substance exerting an equilibrium vapour pressure less than that of pure liquid at the same temperature is called the __________ moisture.
Moisture in a substance exerting an equilibrium vapour pressure less than that of pure liquid at the same temperature is called the __________ moisture.
Boiling point diagram is
Boiling point diagram is
Small dia distillation column can be a
Small dia distillation column can be a
Equilibrium moisture of a solid is equal to the total moisture minus free moisture. Which of the following substances will have maxi-mum equilibrium moisture?
Equilibrium moisture of a solid is equal to the total moisture minus free moisture. Which of the following substances will have maxi-mum equilibrium moisture?
Which of the following assumes constant molal vaporisation and overflow?
Which of the following assumes constant molal vaporisation and overflow?
The film penetration model of mass transfer was enunciated by
The film penetration model of mass transfer was enunciated by
Pick out the correct statement.
Pick out the correct statement.
Penetration model (theory) for mass transfer was enunciated by
Penetration model (theory) for mass transfer was enunciated by
In case of liquids, the binary diffusivity is proportional to (where, T = temperature)
In case of liquids, the binary diffusivity is proportional to (where, T = temperature)
The operation involved when the soluble material is largely on the surface of an insoluble solid and is merely washed off by the solvent is called
The operation involved when the soluble material is largely on the surface of an insoluble solid and is merely washed off by the solvent is called
Pick out the correct statement.
Pick out the correct statement.
If a two phase system is in physical equilibrium; then it means that, the
If a two phase system is in physical equilibrium; then it means that, the
The surface renewal frequency in Danckwerts model of mass transfer is given by (KL: mass transfer co-efficient)
The surface renewal frequency in Danckwerts model of mass transfer is given by (KL: mass transfer co-efficient)
Relative volatility does not change appreciably with the change in
Relative volatility does not change appreciably with the change in
The diffusivity (D) in a binary gas mixture is related to the temperature (T) as
The diffusivity (D) in a binary gas mixture is related to the temperature (T) as
At the boiling point of the liquid at the prevailing pressure, the saturated absolute humidity becomes
At the boiling point of the liquid at the prevailing pressure, the saturated absolute humidity becomes
Diffusion in concentrated solutins differs from that in dilute solutions, because of the change in the __________ with the concentration of the solution.
Diffusion in concentrated solutins differs from that in dilute solutions, because of the change in the __________ with the concentration of the solution.
In a packed tower, the value of HETP equals HTUOG, when the equilibrium and the operating lines are (where, HETP = height equivalant to a theoretical plate HTUOG = overall gas phase height of a transfer unit)
In a packed tower, the value of HETP equals HTUOG, when the equilibrium and the operating lines are (where, HETP = height equivalant to a theoretical plate HTUOG = overall gas phase height of a transfer unit)
Extraction of pencillin employs a __________ extraction coloumn.
Extraction of pencillin employs a __________ extraction coloumn.
Dry bulb temperature of unsaturated air is more than its __________ temperature.
Dry bulb temperature of unsaturated air is more than its __________ temperature.
Pick out the correct statement.
Pick out the correct statement.
Pick out the wrong statement.
Pick out the wrong statement.
Flights in a rotary dryer are provided to
Flights in a rotary dryer are provided to
Sides of equilateral-triangular co-ordinates (on which ternary liquid system is plotted) represent
Sides of equilateral-triangular co-ordinates (on which ternary liquid system is plotted) represent
Blowdown in a cooling tower
Blowdown in a cooling tower
Molecular seives are regenerated by heating to __________ °C.
Molecular seives are regenerated by heating to __________ °C.
The drying time between fixed moisture contents within the 'constant rate period' is proportional to (assuming that drying occurs from all surfaces of the solid) (where, T = thickness of the solid )
The drying time between fixed moisture contents within the 'constant rate period' is proportional to (assuming that drying occurs from all surfaces of the solid) (where, T = thickness of the solid )
In a packed absorption tower, if the equilibrium and operating lines are both straight lines, then the ratio, HETP/HTUOG __________ the absorption factor.
In a packed absorption tower, if the equilibrium and operating lines are both straight lines, then the ratio, HETP/HTUOG __________ the absorption factor.
For the flow of gases through a capillary, with increase in temperature, the permeability __________ as per Knudsen law.
For the flow of gases through a capillary, with increase in temperature, the permeability __________ as per Knudsen law.
__________ diffusion is used for separating the isotopes of methane.
__________ diffusion is used for separating the isotopes of methane.
In distillation column design, the McCabe-Thiele procedure is inadequate and a Ponchan-Savarit procedure is needed, when
In distillation column design, the McCabe-Thiele procedure is inadequate and a Ponchan-Savarit procedure is needed, when
Moisture contained by a substance in excess of the equilibrium moisture is called the __________ moisture.
Moisture contained by a substance in excess of the equilibrium moisture is called the __________ moisture.
__________ column is preferred to be used, when a high liquid hold up is required in a reactor for gas-liquid reaction.
__________ column is preferred to be used, when a high liquid hold up is required in a reactor for gas-liquid reaction.
All moisture in a non-hygroscopic material is the __________ moisture.
All moisture in a non-hygroscopic material is the __________ moisture.
Binary distillation involves the mass transfer by __________ at the gas-liquid interface.
Binary distillation involves the mass transfer by __________ at the gas-liquid interface.
Pick out the correct statement.
Pick out the correct statement.
On addition of solute in the solvent, the __________ of the solution decreases.
On addition of solute in the solvent, the __________ of the solution decreases.
The wetted wall tower is used to determine
The wetted wall tower is used to determine
For the gas absorption, the height of a transfer unit, based on the gas phase is given by (G: superficial molar gas velocity, L: superficial molar liquid velocity, FG:mass transfer co-efficient, mols/m² , a: in-terfacial area per unit volume of tower)
For the gas absorption, the height of a transfer unit, based on the gas phase is given by (G: superficial molar gas velocity, L: superficial molar liquid velocity, FG:mass transfer co-efficient, mols/m² , a: in-terfacial area per unit volume of tower)
Under conditions of flooding in packed tower, the gas pressure drop
Under conditions of flooding in packed tower, the gas pressure drop
The relative volatility of a binary mixture at constant temperature __________ the total pressure.
The relative volatility of a binary mixture at constant temperature __________ the total pressure.
The Schmidt number which is defined as, μ/ρ D, is the ratio of the
The Schmidt number which is defined as, μ/ρ D, is the ratio of the
In case of cooling towers, the ratio of the rates of heat and mass transfer is indicated by the __________ number.
In case of cooling towers, the ratio of the rates of heat and mass transfer is indicated by the __________ number.
For the same system, if the same liquid used in an absorber is decreased, the tower height will
For the same system, if the same liquid used in an absorber is decreased, the tower height will
An example of elutioh is
An example of elutioh is
The binary diffusivity in gases and liquids vary respectively as
The binary diffusivity in gases and liquids vary respectively as
Pick out the correct statement.
Pick out the correct statement.
Wet bulb and dry bulb temperatures becomes identical at __________ percent saturation curve.
Wet bulb and dry bulb temperatures becomes identical at __________ percent saturation curve.
Compound A is extracted from a solution of A + B into a pure solvent S. A Co-current unit is used for the liquid-liquid extraction. The inlet rate of the solution containing A is 200 moles of B/hr.m² and the solvent flow, rate is 400 moles of S/m². hr. The equilibrium data is represented by Y = 3X² , where Y is in moles of a A/moles of B and X is in moles A/moles of S. The maximum percentage extraction achieved in the unit is
Compound A is extracted from a solution of A + B into a pure solvent S. A Co-current unit is used for the liquid-liquid extraction. The inlet rate of the solution containing A is 200 moles of B/hr.m² and the solvent flow, rate is 400 moles of S/m². hr. The equilibrium data is represented by Y = 3X² , where Y is in moles of a A/moles of B and X is in moles A/moles of S. The maximum percentage extraction achieved in the unit is
Leaching of sugar from sugar beets is done by
Leaching of sugar from sugar beets is done by
In distillation where q is defined as the moles of liquid flow in the stripping section per mole of feed introduced, for saturated liquid feed
In distillation where q is defined as the moles of liquid flow in the stripping section per mole of feed introduced, for saturated liquid feed
In case of constant underflow extraction operation, the __________ at all solute concentration.
In case of constant underflow extraction operation, the __________ at all solute concentration.
Prandtl number for water at 20°C is about
Prandtl number for water at 20°C is about
Mass transfer co-efficient is directly proportional to DAB0.5, according to __________ theory.
Mass transfer co-efficient is directly proportional to DAB0.5, according to __________ theory.
In physical terms, Schmidt number means
In physical terms, Schmidt number means
In extractive distillation, solvent is
In extractive distillation, solvent is
Plate towers are preferred to packed towers, when large temperature changes are involved, because of the reason that the
Plate towers are preferred to packed towers, when large temperature changes are involved, because of the reason that the
When adsorption hysteresis is observed, the desorption equilibrium pressure is __________ that obtained by adsorption.
When adsorption hysteresis is observed, the desorption equilibrium pressure is __________ that obtained by adsorption.
Surface renewal model of mass transfer was enunciated by
Surface renewal model of mass transfer was enunciated by
