Mass Transfer

451.The efficiency of a plate column will be maximum, when the flow is ideal _________ the plate.

1. Across
2. Above
3. Both (A) & (B)
4. Neither (A) nor (B)

View answer

452.The equation, NA = (D_AB . Pt /RTZ . PBM) (P_A1 - P_A2) is for

1. Fick's second law of diffusion
2. Steady state diffusion for stagnant case
3. Liquid M.T.C. by Higbie penetration theory
4. None of these

View answer

453.The equation, NA = (D_AB . Pt /RTZ) (y₁ - y₂) is for

1. Steady state equimolar counter diffusion
2. Fick's first law of diffusion
3. Steady state diffusion for stagnant case
4. Liquid M.T.C. by penetration theory

View answer

454.The equilibrium liquid composition compared to the vapor composition in case of Azeotropic mixture is

1. More
2. Less
3. Same
4. Either more or less; depends on the system

View answer

455.The equipment frequently used for adiabatic humidification-cooling operation with recirculating liquid is

1. Natural draft cooling tower
2. Induced draft cooling tower
3. Spray chamber
4. None of these

View answer

456.The equipment used in the extraction of highly corrosive radioactive liquids is

1. Pulse column
2. Spray column
3. Mixer settler
4. Baffle tower

View answer

457.The expression, ln(F/W) = ∫^xF xW [dx/y* - x)] is

1. Differential distillation equation
2. For NtoG in absorption for dilute mixture
3. Slope of q-line in McCabe-Thiele method
4. For relative volatility

View answer

458.The expression, y(1 - x)/x(1 - y) is for

1. Absorption factor
2. Relative volatility
3. Selectivity
4. Murphree efficiency

View answer

459.The falling rate period in the drying of a solid is characterised by

1. Increase in rate of drying
2. Increasing temperatures both on the surface and within the solid
3. Decreasing temperatures
4. None of these

View answer

460.The feed to fractionating column is changed from saturated vapour to saturated liquid. If the separation and reflux ratio remains unchanged, the number of ideal stages will

1. Increase
2. Decrease
3. Remain same
4. Depend on saturated boiling point; may increase or decrease

View answer