Process Equipment and Plant Design MCQs

Question 1

What is the minimum recommended ligament for square pitch arrangement in case of heat exchangers?

Accepted Answer

6.5 mm

Answer

6.5 cms

Answer

Equal to tube I.D

Answer

Equal to tube O.D

Question 2

Theoretically calculated diameter of the stripping section of the continuous rectification column is __________ that of the enriching section.

Accepted Answer

More than

Answer

Less than

Answer

Same as

Answer

Either more or less (depending upon relative volatility)

Question 3

In a double pipe concentric heat exchanger, the equivalent diameter of annulus for heat transfer would be (where, D 1 and D 2 are I.D. of inner and outer pipes)

Accepted Answer

$$\frac{{{	ext{D}}_2^2 - {	ext{D}}_1^2}}{{{	ext{D}}_1^2}}$$

Answer

D 2 - D 1

Answer

$$\frac{{{	ext{D}}_2^2 - {	ext{D}}_1^2}}{{{	ext{D}}_2^2}}$$

Answer

None of these

Question 4

For annular flow of a fluid, the ratio of the equivalent diameter for pressure drop calculation to the equivalent diameter for heat transfer calculation is

Accepted Answer

$$\frac{{{{	ext{d}}_1}}}{{{{	ext{d}}_1} + {{	ext{d}}_2}}}$$

Answer

$$\frac{{{{	ext{d}}_2}}}{{{{	ext{d}}_1} + {{	ext{d}}_2}}}$$

Answer

$$\frac{{{{	ext{d}}_1} + {{	ext{d}}_2}}}{{{{	ext{d}}_1}}}$$

Answer

$$\frac{{{{	ext{d}}_1} + {{	ext{d}}_2}}}{{{{	ext{d}}_2}}}$$

Question 5

Pick out the wrong statement about routing of fluids in a shell and tube heat exchanger.

Accepted Answer

Higher pressure fluid stream should be routed through the shell side

Answer

The corrosive and fouling fluid should be preferably routed through the tubes

Answer

The viscous fluid should be routed through the shell side

Answer

Lower flow rate fluid should be routed through the shell side

Question 6

A perforated plate has holes of diameter d h arranged in a pitch p h . Each hole has a tube of I.D. d t passing through it. The ligament efficiency is given by

Accepted Answer

$$\frac{{{{	ext{p}}_{	ext{h}}} - {{	ext{d}}_{	ext{t}}}}}{{{{	ext{p}}_{	ext{h}}}}}$$

Answer

$$\frac{{{{	ext{p}}_{	ext{h}}} - {{	ext{d}}_{	ext{h}}}}}{{{{	ext{p}}_{	ext{h}}}}}$$

Answer

$$\frac{{{{	ext{p}}_{	ext{h}}} - \left( {\frac{{{{	ext{d}}_{	ext{h}}}\,{{	ext{d}}_{	ext{t}}}}}{2}} ight)}}{{{{	ext{p}}_{	ext{h}}}}}$$

Answer

$$\frac{{{{	ext{p}}_{	ext{h}}} - {{	ext{d}}_{	ext{h}}}}}{{{{	ext{d}}_{	ext{h}}}}}$$

Question 7

In a shell and tube heat exchanger, the overall heat transfer co-efficient is proportional to the tube side (volumetric flow rate) 0.8 . This is valid, only when the ratio of the tube side film resistance to the total resistance is almost equal to

Accepted Answer

1

Answer

∞

Answer

20.8

Answer

2

Question 8

In distillation columns, bubble caps are held in place over trays by

Accepted Answer

Both B and C

Answer

Rivets

Answer

A hold down bar

Answer

Bolts

Question 9

The main purpose of providing stepping on the trays is to

Accepted Answer

Facilitate handling of large flow rate of liquid

Answer

Increase the residence time

Answer

Decrease the pressure drop

Answer

Improve the flow condition