GATE CH Mass Transfer PYQs & Answers — Page 8

Questions 71–77 of 77. Imported answers require independent review unless marked reviewed.

Which of the following conditions are valid at the plat point? P) Density difference between the extract and raffinate phases is zero Q) Interfacial tension between the extract and raffinate phases is zero R) Composition difference between the extract and raffinate phases is zero

Your answerChoose one option.

P and Q only

Q and R only

P and R only

P, Q and R

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

The composition of vapour entering a tray in a distillation column is 0.47. The average composition of the vapour leaving the tray is 0.53. The equilibrium composition of the vapour corresponding to the liquid leaving this tray is 0.52. All the compositions are expressed in mole fraction of the more volatile component.

The Murphree efficiency based on the vapour phase, rounded to the nearest integer, is ______ %.

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Consider steady state mass transfer of a solute A from a gas phase to a liquid phase. The gas phase bulk and interface mole fractions are

and

, respectively. The liquid phase bulk and interface mole fractions are

and

, respectively. The ratio

is very close to zero.

This implies that mass transfer resistance is

Your answerChoose one option.

negligible in the gas phase only

negligible in the liquid phase only

negligible in both the phases

considerable in both the phases

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

The vapor phase composition and relative volatilities (with respect to n-propane) on an ideal tray of a distillation column are

Component	Methane	Ethane	n-Propane
Mole fraction in vapor	0.12	0.28	0.60
Relative volatility	10	4	1

The mole fraction of n-propane in the liquid phase, rounded to 2 decimal places, is ____________.

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

The Sherwood number (

) correlation for laminar flow over a flat plate of length

is given by

where

and

represent Reynolds number and Schmidt number, respectively. This correlation, expressed in the form of Chilton-Colburn

factor, is

Your answerChoose one option.

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

In a countercurrent stripping operation using pure steam, the mole ratio of a solute in the liquid stream is reduced from 0.25 to 0.05. The liquid feed flowrate, on a solute-free basis, is 3 mol/s. The equilibrium line for the system is given in the figure below.

Diagram for Chemical Engineering question 44

The MINIMUM flowrate of pure steam for this process, rounded to 1 decimal place, is ______ mol/s.

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

In a batch adsorption process, 5 g of fresh adsorbent is used to treat 1 liter of an aqueous phenol solution. The initial phenol concentration is 100 mg/liter. The equilibrium relation is given by

where

is the amount of phenol adsorbed in mg of phenol per gram of adsorbent, and

is the concentration of phenol in mg/liter in the aqueous solution. When equilibrium is attained between the adsorbent and the solution, the concentration of phenol in the solution, rounded to 1 decimal place, is __________ mg/liter.

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

GATE CH Mass Transfer PYQs

Question 14

Question 15

Question 16

Question 42

Question 43

Question 44

Question 45