Chemical Engineering MCQs

It is desired to bring about a certain change in the state of a system by performing work on the system under adiabatic conditions.

by
A. The amount of work needed is path dependent
B. Work alone can not bring out such a change of state
C. The amount of work needed is independent of path
D. More information is needed to conclude anything about the path dependence or otherwise of the work needed
✅ The correct answer is option A.

At 60° C, vapour pressure of methanol and water are 84.562 kPa and 19.953 kPa respectively. An aqueous solution of methanol at 60° C exerts a pressure of 39.223 kPa; the liquid phase and vapour phase mole fractions of methanol are 0.1686 and 0.5714 respectively. Activity co-efficient of methanol is

by
A. 1.572
B. 1.9398
C. 3.389
D. 4.238
✅ The correct answer is option A.

Pick out the wrong statement pertaining to a shell and tube heat exchanger.

by
The minimum value of baffle spacing is 50 mm.
The maximum value of baffle spacing is equal to the I.D. of the shell.
The maximum unsupported tube span is generally about 75 times tube diameter, but is reduced to about 60 times for aluminium, copper & alloys of these.
Disk and doughnut baffle is the most commonly used baffle.
✅ The correct answer is option D.