PROCESS EQUIPMENT AND PLANT DESIGN QUIZ

A minimum clearance of about __________ mm is maintained between the distillation column wall and the bubble cap.

76

38

95

19

TRUE ANSWER : ?
YOUR ANSWER : ?

In a cylinderical vessel subjected to internal pressure, the longitudinal stress σL and the circumferential stress, σh are related by

σh = 2 σL

No relation exists

σh = σL/2

σh = σL

TRUE ANSWER : ?
YOUR ANSWER : ?

Maximum acceptable total liquid gradient over a tray is about __________ mm.

30.5

45.5

5.5

12.5

TRUE ANSWER : ?
YOUR ANSWER : ?

Weep holes provided in the plates of a distillation column

Must be large enough (usually 1/4" to 5/8" dia) to prevent plugging but should not deliver excessive amount of fluid during operation

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

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

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

In a multiple effect evaporator system having 'n' effects, the amount of water evaporated per unit surface area in approximately equal to __________ times that in a single effect.

1.5 nth

nth

(1/n)th

0.5 nth

TRUE ANSWER : ?
YOUR ANSWER : ?

In the design of a bag filter, the gas temperature is an important consideration, as it affects the

Gas density

All of these

Fibre selection

Gas viscosity

TRUE ANSWER : ?
YOUR ANSWER : ?

The thermal stress in a metallic bar does not depend upon the

Both A & B

Cross-sectional area

Neither A nor B

Changes in temperature

TRUE ANSWER : ?
YOUR ANSWER : ?

The slope of operating line in the rectifying section of a distillation column is unity, if the reflux ratio is

0

Minimum

∞

1

TRUE ANSWER : ?
YOUR ANSWER : ?

A perforated plate has holes of diameter dh arranged in a pitch ph. Each hole has a tube of I.D. dt passing through it. The ligament efficiency is given by

(ph - dt)/ph

(ph - dh)/ph

(ph - dh)/dh

(ph - dh . dt/2)/ph

TRUE ANSWER : ?
YOUR ANSWER : ?

Typical static submergence for bubble cap plate column operating at atmospheric pressure may be around

2.5"

50% of the plate spacing

0.5"

5"

TRUE ANSWER : ?
YOUR ANSWER : ?