Back-trapping in a distillation column results due to_________________?

A. Low gas velocity
B. High gas velocity
C. Excessive liquid gradient over the tray
D. Low reflux ratio

“A claming section” before the liquid flows into the downcomer is provided to__________________?

A. Permit release of entrained vapour in the liquid
B. Reduce the discharge fluctuation
C. Ensure better vapour-liquid contact
D. Cool the liquid before it flows down

In condenser, the cooling water is passed in the tube side in a pass arrangement, because________________?

A. It reduces heat transfer area
B. More thinner tubes can be used
C. Pressure drop is reduced
D. It makes condenser compact

Which of the following is not a graphical method (but is an analytical method) for the calculation of theoretical number of stages in case of continuous binary distillation ?

A. Sorel-Lewis method
B. McCabe-Thiele’s method
C. Ponchon-Savarit method
D. None of these

An adequate clearance between the tray and the shell wall of a distillation column is provided to_____________________?

A. Drain the liquid from the tray when the unit is not in operation
B. Allow for thermal expansion and facilitate installation
C. Avoid back-trapping
D. None of these

The value of fouling factor depends upon the__________________?

A. Characteristic of process fluid
B. Velocity of process fluid containing suspended solids
C. Suspended solids in the fluid
D. All A., B. and C.

Pressure drop (Δp) and the superficial gas mass velocity (G) in case of packed absorption tower operating in the preloading range are related as_________________?

A. Δp = G
B. Δp = G0.5
C. Δp = G2
D. Δp = 1/G0.6

Minimum tube pitch recommended for shell and tube heat exchangers is about _______________ times the outside diameter of the tube?

A. 1.25
B. 1.75
C. 2.5
D. 3.5

Minimum recommended baffle spacing in a shell and tube heat exchanger is about (where, D = shell diameter) ?

A. 0.2 D
B. 0.5 D
C. 0.66 D
D. 0.80 D

Reflux ratio variation in a distillation column is between___________________?

A. Zero and infinity
B. Zero and one
C. Minimum and infinity
D. None of these