Q.1
Dry bulb temperature of the gas is __________ the wet bulb temperature.
Q.2
Pick out the correct statement.
Q.3
A mixture of 10% C₆H₆ vapour in air at 25°C and 750 mm Hg has a dew point of 20°C. Its dew point at 30°C and 700 mm Hg will be around __________ °C.
Q.4
For a binary mixture with low relative volatility,
Q.5
In continuous distillation, the internal reflux ratio (Ri) and the external reflux ratio (Re) are related as
Q.6
At a fixed total pressure, humidity depends only on the
Q.7
The boiling points of pure components of a binary system __________ with increase in total pressure of the system.
Q.8
Though, theoretically the adsorption & desorption isotherms is expected to coincide but sometimes at least a part of the isotherms does not coincide and this phenomenon is known as adsorption hysterisis. In such cases, the desorption equilibrium pressure is __________ that obtained for adsorption.
Q.9
Freundlich equation applies to the adsorption of solute from
Q.10
Which of the following is not fixed by the process requirements, in the design of absorbers?
Q.11
For continuous drying of grannular or crystalline material, the dryer used is the __________ dryer.
Q.12
Which of the following is the most suitable for extraction in a system having very low density difference?
Q.13
Pick out the correct statement.
Q.14
The rate of solid-liquid extraction is limited by the
Q.15
For a single component absorber, the operating line is straight only when plotted in term of __________ units.
Q.16
Humid volume is the total volume in m³ of 1 kg of
Q.17
The cooling effect in a cooling tower can not be increased by
Q.18
The most efficient cooling tower out of the following is
Q.19
The relative volatility of a binary mixture at the azeotropic composition is
Q.20
Packed column distillation is limited to the column __________ metres.
Q.21
The mass transfer co-efficient for a solid sphere of radius 'a' dissolving in a large volume of quiescent liquid, in which D is the diffusivity of solute, is
Q.22
Which of the following processes is followed by unsaturated air (with dry bulb temperature 12°C and relative humidity 47%) passing through water spray washer (temperature of water being constant at 40°C?
Q.23
Cox chart is useful in the design of
Q.24
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 7.30 kPa and 19.91 kPa respectively.The humidity of air sample expressed as kg of water vapour/kg of dry air is
Q.25
The binary diffusivity in gases and liquids vary respectively as
Q.26
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
Q.27
Sides of equilateral-triangular co-ordinates (on which ternary liquid system is plotted) represent
Q.28
Weight of 1 m³ of humid air as compared to 1 m³ of dry air, under the same conditions, is
Q.29
Critical humidity of a solid salt means the humidity
Q.30
The process employing desorption of the absorbed solute by a solvent is called
Q.31
Degree of freedom for leaching and solvent extraction process is
Q.32
Inside the distillation columns, the
Q.33
If moisture content of solid on dry basis is X, then the same on wet basis is
Q.34
Only small amount of evaporation of water produces large cooling effects because of its
Q.35
For the same system, if the same liquid used in an absorber is decreased, the tower height will
Q.36
In extractive distillation, solvent is
Q.37
The reciprocal of stripping factor is termed as
Q.38
Humidity chart is useful for the solution of problems concerning condensation, vaporisation and air conditioning. At a given dry bulb temperature, value of humidity obtained from the humidity chart directly, is in terms of __________ humidity.
Q.39
A slurry is to be dried to produce flaky solid. Which dryer would you recommend?
Q.40
Channelling is most severe
Q.41
According to Poiseuille's law, the permeability for gas flow through a capillary is proportional to (where, μ = gas viscosity)
Q.42
Air initially at 101. 3 kPa and 40°C and with a relative humidity of 50%, is cooled at constant pressure to 30°C. The cooled air has a
Q.43
Absorption accompanied by heat evolution results in
Q.44
Molecular seives are regenerated by heating to __________ °C.
Q.45
If a two phase system is in physical equilibrium; then it means that, the
Q.46
Mass transfer co-efficient is directly proportional to DAB0.5, according to __________ theory.
Q.47
Which of the following provides maximum contact surface for a liquid-vapour system?
Q.48
CO₂ can be absorbed by
Q.49
Pick out the correct statement.
Q.50
Diffusion in concentrated solutins differs from that in dilute solutions, because of the change in the __________ with the concentration of the solution.
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