PROCESS EQUIPMENT AND PLANT DESIGN QUIZ

In the downcomer of a distillation column, the minimum recommended residence time is about __________ seconds.

17.5

12.5

5

2.5

TRUE ANSWER : ?
YOUR ANSWER : ?

Hoop (circumferential) stress induced in a thin walled 'Horton Sphere' used for the storage of liquid ammonia under pressure is

pD/3t

pD/4t

pD/2t

pD/6t

TRUE ANSWER : ?
YOUR ANSWER : ?

The LMTD correction factor (FT) is applied in __________ heat exchangers.

1-1 cocurrent

All of these

All multipass

Double pipe

TRUE ANSWER : ?
YOUR ANSWER : ?

Baffles may be eliminated for

None of these

Low viscosity liquids (< 200 poise)

High viscosity liquids (> 600 poise)

Large diameter tanks

TRUE ANSWER : ?
YOUR ANSWER : ?

Generally, elliptical dished heads

All of these

Resist half the pressure rating compared to hemi spherical head provided on the cylindrical shell of the same thickness and diameter

Are approximately as strong as seamless cylindrical shell having the corresponding I.D and O.D

Are manufactured on 2:1 ratio of major to minor axis and is recommended to be used for pressure vessels operating above a pressure of 1.5 MN/m²

TRUE ANSWER : ?
YOUR ANSWER : ?

Vertical vessels are not supported by

Skirts

Brackets

Columns

Saddles

TRUE ANSWER : ?
YOUR ANSWER : ?

Excessive liquid gradient on a tray may result in the

Back trapping

Gas blowing beneath cap skit

All of these

Maldistribution of gas

TRUE ANSWER : ?
YOUR ANSWER : ?

Diameter of rivet hole (d, mm) and the plate thickness (t, mm) are related by Unwin's formula as

D = 1.5 t

D = 1.6 √t

D = 1.1 t

D = 3√t

TRUE ANSWER : ?
YOUR ANSWER : ?

Value of Peclet number = 0, is the representative of

Plug flow

Eddy diffusivity = 0

Laminar flow

Complete back mixing

TRUE ANSWER : ?
YOUR ANSWER : ?

For high pressure process equipments/vessels, the connected nozzle should be

Flanged

Screwed

Brazed

Welded

TRUE ANSWER : ?
YOUR ANSWER : ?