Process Equipment and Plant Design MCQs

Question 1

Pick out the wrong statement.

Accepted Answer

In a stainless steel seive tray, the minimum hole diameter is equal to 10 times the plate thickness

Answer

In practical operation, distillation towers having diameter 3-6 metres equipped with bubble cap (round) size of 15 cms are used

Answer

Height of packing in a packed tower is about 3 times the column diameter for raschig rings and about 5 to 10 times the column diameter for saddle packing

Answer

In a seive tray, the minimum hole diameter is equal to the tray thickness

Question 2

High pressure fluid in a shell and tube heat exchanger should preferably be routed through the

Accepted Answer

Tubes to avoid the expansion of high pressure shell construction

Answer

Shell side for smaller total pressure drop

Answer

Shell side, if the flow is counter-current and tube side if the flow is co-current

Answer

Shell side for large overall heat transfer co-efficient

Question 3

The absorption factor is defined as (where, S 1 = slope of the equilibrium curve, S 2 = slope of the operating line)

Accepted Answer

$$\frac{{{{	ext{S}}_1}}}{{{{	ext{S}}_2}}}$$

Answer

$${{	ext{S}}_1}.{{	ext{S}}_2}$$

Answer

$$\frac{{{{	ext{S}}_2}}}{{{{	ext{S}}_1}}}$$

Answer

$$\frac{1}{{{{	ext{S}}_1}.{{	ext{S}}_2}}}$$

Question 4

Scale up problem in design based on the similarity concept takes into account __________ similarity.

Accepted Answer

All of the above

Answer

Geometrical

Answer

Kinematic

Answer

Dynamic

Question 5

Weep holes provided in the plates of a distillation column

Accepted Answer

All of the above

Answer

Facilitate draining out liquid from a tray when the unit is not in operation

Answer

Are normally located near the overflow weir so that any delivery of liquid during operation follows approximately the same path as the overflow fluid

Answer

Must be large enough (usually $${\frac{1}{4}^{''}}$$ to $${\frac{5}{8}^{''}}$$ dia) to prevent plugging but should not deliver excessive amount of fluid during operation

Question 6

Which of the following is not a valid assumption in continuous binary distillation for calculating the number of equilibrium stages by Mc-Cabe-Thiele's method?

Accepted Answer

Reflux is not a saturated liquid

Answer

Sensible heat changes for vapour & liquid are negligibly small

Answer

Molar latent heat of the two components are equal

Answer

Heat of mixing of normal liquid is assumed to be zero

Question 7

A 'rupture disc' is provided in chemical equipments as an accessory meant for

Accepted Answer

Relieving excess pressure

Answer

Creating turbulence

Answer

Enhancing mixing rate

Answer

Avoiding vortex formation

Question 8

For a given design of bubble cap, the number of bubble caps to be used per tray is set by the

Accepted Answer

Allowable gas velocity through the slots

Answer

Plate spacing

Answer

Diameter of the column

Answer

All of the above

Question 9

The ideal size of round bubble caps to be used in industrial distillation column having a diameter of 3-6 metres is __________ cms.

Accepted Answer

15

Answer

5

Answer

7.5

Answer

50