Mass Transfer The diffusivity (D) in a binary gas mixture is related to the pressure (P) as D ∝ 1/P1.5 D ∝ P0.5 D ∝ 1/P0.5 D ∝ 1/P D ∝ 1/P1.5 D ∝ P0.5 D ∝ 1/P0.5 D ∝ 1/P ANSWER DOWNLOAD EXAMIANS APP
Mass Transfer Pressure drop through plate tower as compared to that through packed tower, for the same duty will be Less More Equal Either A or B; depends on the packing height Less More Equal Either A or B; depends on the packing height ANSWER DOWNLOAD EXAMIANS APP
Mass Transfer According to the Fenske equation, what will be the minimum number of plates required in a distillation column to separate an equimolar binary mixture of components A and B into an overhead fraction containing 99 mol% A and a bottom fraction containing 98 mol% B? Assume that relative volatility (αAB = 2) does not change appreciably in the coloumn. 8 12 10 6 8 12 10 6 ANSWER DOWNLOAD EXAMIANS APP
Mass Transfer 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. 20 18.7 27.3 21.7 20 18.7 27.3 21.7 ANSWER DOWNLOAD EXAMIANS APP
Mass Transfer Entrainer used in azeotropic distillation should Have high latent heat of vaporisation Form a new azeotrope of low relative volatility with one of the constituents of the mixture Form a low boiling azeotrope with one of the constituents of the mixture Have high viscosity to provide high tray efficiency Have high latent heat of vaporisation Form a new azeotrope of low relative volatility with one of the constituents of the mixture Form a low boiling azeotrope with one of the constituents of the mixture Have high viscosity to provide high tray efficiency ANSWER DOWNLOAD EXAMIANS APP
Mass Transfer In case of steam distillation, the steam leaving the liquid is not completely saturated with distillate vapour, because Saturated steam is used for steam distillation Total pressure is less Mixing of steam with the material being vaporised is not so intimate as to result in equilibrium condition Temperature is less Saturated steam is used for steam distillation Total pressure is less Mixing of steam with the material being vaporised is not so intimate as to result in equilibrium condition Temperature is less ANSWER DOWNLOAD EXAMIANS APP
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