'ADDUCTS' and 'CLATHRATES' are used in case of
A. Extractive distillation
B. Crystallisation
C. Absorption
D. None of these
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Azeotropic distillation is employed to separate
A. Constant boiling mixture
B. High boiling mixture
C. Mixture with very high relative volatility
D. Heat sensitive materials
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With increase in temperature, the leaching rate increases due to
A. Decreased liquid viscosity
B. Increased diffusivity
C. Both A & B
D. Neither A nor B
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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
A. At ground level
B. 2 metres above the ground
C. 5 metres above ground
D. 10 metres above ground
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Lewis number (Le) is
A. Sc × Pr
B. Pr × St
C. Sh × Pr
D. St × Sh
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Which one of the following devices is not used for both the absorption as well as the liquid-liquid extraction processes?
A. Packed towers
B. Plate towers
C. Spray towers
D. Wetted wall columns
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The apex of an equilateral-triangular coordinate (in ternary liquid system) represents a/an
A. Pure component
B. Binary mixture
C. Ternary mixture
D. Insoluble binary system
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In case of non-ideal gases and liquids, the molal diffusivity
A. Varies inversely as the pressure
B. Varies directly as the pressure
C. Is independent of pressure
D. Is equal to the volumetric diffusivity
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In the desorption of highly soluble gas from the liquid, the main resistance will be in the __________ phase.
A. Gas
B. Liquid
C. Both A & B
D. Neither A nor B
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With decrease in the throughput (compared with the design capacity) for a bubble cap distillation column, its efficiency
A. Increases
B. Decreases
C. Remains same
D. May increase or decrease ; depends on individual design
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Which is the controlling factor for a drum drier?
A. Diffusion
B. Heat transfer
C. Both A & B
D. Neither A nor B
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Absorption factor is defined as (where, S1 = slope of the operating line S2 = slope of the equilibrium curve)
A. S 1 S 2
B. S 2 S 1
C. S1 - S2
D. S1 × S2
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Minimum possible diameter of a packed coloumn is decided mainly by the
A. Flooding
B. Gas viscosity
C. Liquid density
D. Liquid hold up
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In triangular co-ordinates, the ternery composition point falls __________ of the triangle.
A. In the corners
B. Inside
C. On the sides
D. None of these
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The dew point of a saturated gas phase equals the __________ temperature.
A. Gas
B. Room
C. Wet bulb
D. None of these
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Which of the following is an undesirable characteristic for the solvent used in gas absorption?
A. Low vapor pressure
B. Low viscosity
C. High gas solubility
D. None of these
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(NSh /NRe .NSc ) is termed in mass transfer operation as the
A. Stanton number
B. Peclet number
C. Thermal diffusivity
D. Momentum diffusivity
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The velocity, concentration and temperature boundary, for the boundary layer development on a flat plate during connective mass transfer will be same, if
A. NSc = 1
B. NSc = NPr = NLe
C. NPr = NLe
D. NSc = NLe
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Lewis number, which is important in problems involving simultaneous heat and mass transfer, is the ratio of
A. Mass diffusivity to momentum diffusivity
B. Thermal diffusivity to mass diffusivity
C. Momentum diffusivity to thermal diffusivity
D. None of these
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The McCabe Δ L law states that the
A. Molar heats of vaporisation of components are nearly equal
B. Linear crystal growth rate depends on the degree of supersaturation
C. Linear crystal growth rate does not depend on the crystal size
D. Linear crystal growth rate depends on the crystal size
Select an option to see the answer and solution.