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Mass Transfer

Mass Transfer
The binary diffusivity in gases and liquids vary respectively as

T and T3/2
√T and T3/2
T3/2 and √T
T3/2 and T

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Mass Transfer
In extractive distillation, solvent is

Present in overhead stream
Of high volatility
Of high viscosity to give high tray efficiency
Added to alter the relative volatility of the mixture

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Mass Transfer
Cox chart, which is useful in the design of distillation column particularly for petroleum hydrocarbons, is a plot of (where, P = vapor pressure, T = temperature)

Log P vs . T
Log P vs. log T
P vs . log T
T vs . P

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Mass Transfer
Which of the following has the same dimension as mass diffusivity?

Both Momentum flux & Kinematic viscosity
Momentum flux
Thermal diffusivity
Kinematic viscosity

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Mass Transfer
Acetone is to be removed from air in an isothermal dilute absorber using pure water as solvent. The incoming air contains 5 mole% of acetone (yin = 0.05). The design equation to be used for obtaining the number of trays (N) of the absorber is, N+2 = 6 log (yin/yout).For 98% recovery of acetone, the number of trays required is/are

8
9
10
1

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Mass Transfer
All moisture in a non-hygroscopic material is the __________ moisture.

Unbound
Free
Bound
Equilibrium

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MORE MCQ ON Mass Transfer

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