Mass Transfer

421.Surface renewal model of mass transfer was enunciated by

1. Toor and Marcello
2. Fick
3. Danckwerts
4. Stefan

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422.Swenson-Walker crystalliser is a _________ unit.

1. Continuous
2. Batch
3. Semi-batch
4. Cooling (adiabatic)-cum-evaporation

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423.Tea percolation employs

1. Liquid-liquid extraction
2. Leaching
3. Absorption
4. None of these

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424.The 'shanks system' of leaching (i.e., counter-current multiple contact leaching) is used for

1. Recovery of tannis from the tree barks and woods
2. Leaching sodium nitrate from Chilean nitrate bearing rock
3. Both (A) and (B)
4. Neither (A) nor (B)

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425.The absorption factor is defined as (where, L = liquid flow rate, G = gas flow rate and, m = slope of the equilibrium line).

1. L/mG
2. G/mL
3. mL/G
4. LG/m

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426.The adiabatic saturation curve for a vapour-gas mixture is

1. Straight line
2. Slightly concave upward
3. Slightly concave downward
4. None of these

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427.The amount of steam required per unit quantity of distillate in case of steam distillation will be reduced by

1. Raising the temperature
2. Lowering the total pressure
3. Both (A) and (B)
4. Neither (A) nor (B)

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428.The apex of an equilateral-triangular coordinate (in ternary liquid system) represents a/an

1. Pure component
2. Binary mixture
3. Ternary mixture
4. Insoluble binary system

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429.The assumption made in Elis method in distillation is that enthalpy concentration lines of vapor and liquid are

1. Parallel
2. Straight
3. Both parallel and straight
4. Neither parallel nor straight

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430.The binary diffusivity in gases and liquids vary respectively as

1. T3/2 and T
2. T and T3/2
3. √T and T3/2
4. T3/2 and √T

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