Mass Transfer - Practice Test

[#356] When acetone is added in a two layer mixture of methyl isobutyl ketone and water at 30°C, the acetone distributes between the two layers and the composition of the layer follows two solubility curves. For this system,

(A) As the acetone concentration increases, the solubility curves approach each other

(B) Both the phases become identical at a particular common point on both the solubility curves called the plait point

(C) The distribution curve which is a plot between x (acetone concentration in one phase) and y (acetone concentration in other phase) is analogous to x - y curve used in distillation and absorption terminates on the x = y diagonal at the concentration of the plait point

(D) All of the above

Correct Answer

(D) All of the above

[#357] Nitrobenzene (boiling point = 210.6°C) is steam distilled at 1 atm pressure.Nitrobenzene will distill off __________ °C.

(A) At < 100

(B) At > 210.6

(C) Between 100 and 210

(D) None of these

Correct Answer

(A) At < 100

[#358] Which of the following has the same dimension as mass diffusivity?

(A) Momentum flux

(B) Kinematic viscosity

(C) Thermal diffusivity

(D) Both A & B

Correct Answer

(D) Both A & B

[#359] Priming in a distillation column

(A) Results from very low gas velocity

(B) Is desirable from point efficiency consideration

(C) Is characterised by the presence of foam throughout the space between trays

(D) Reduces the overall pressure drop

Correct Answer

(C) Is characterised by the presence of foam throughout the space between trays

[#360] In case of unsaturated air

(A) Dew point < wet bulb temperature

(B) Wet bulb temperature < dry bulb temperature

(C) Both A & B

(D) Neither A nor B

Correct Answer

(C) Both A & B

Mass Transfer - Study Mode

[#356] When acetone is added in a two layer mixture of methyl isobutyl ketone and water at 30°C, the acetone distributes between the two layers and the composition of the layer follows two solubility curves. For this system,

Correct Answer

[#357] Nitrobenzene (boiling point = 210.6°C) is steam distilled at 1 atm pressure.Nitrobenzene will distill off __________ °C.

Correct Answer

[#358] Which of the following has the same dimension as mass diffusivity?

Correct Answer

[#359] Priming in a distillation column

Correct Answer

[#360] In case of unsaturated air

Correct Answer