PROCESS EQUIPMENT AND PLANT DESIGN QUIZ

The minimum shell thickness for tank ≤ 15 metres diameter is limited to __________ mm, for reasons of elastic stability.

15

2

10

5

TRUE ANSWER : ?
YOUR ANSWER : ?

An increase in the liquid resistance to interphase mass transfer and a resultant reduction in plate efficiency is caused by

Decrease in gas solubility for absorbers

All of these

An increase in relatived volatility for rectification columns

An increase in liquid viscosity

TRUE ANSWER : ?
YOUR ANSWER : ?

Stage efficiency for packed tower varies with the

Type & size of packing

All of these

Fluid rates and fluid properties

Operating pressure and column diameter

TRUE ANSWER : ?
YOUR ANSWER : ?

Cooling water fouling factors vary in the range of 0.001 to 0.003

(kcal/hr. m. °C)⁻¹

(W/m².°K)⁻¹

(kcal/hr.m² .°C)⁻¹

(BTU/hr.ft² . °F)⁻¹

TRUE ANSWER : ?
YOUR ANSWER : ?

Diameter of bubble caps used in high pressure columns is __________ as compared to that used in identical vacuum columns.

Less

More

Same

Either A or B; no generalisation can be made

TRUE ANSWER : ?
YOUR ANSWER : ?

Longitundinal stress induced in a thin walled cylindrical storage vessel is

PD/6t

PD/4t

PD/3t

PD/2t

TRUE ANSWER : ?
YOUR ANSWER : ?

Generally, elliptical dished heads

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

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

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

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

2.5

1.75

3.5

1.25

TRUE ANSWER : ?
YOUR ANSWER : ?

Le/D for a Tee (used as elbow, entering branch) would be

Both B and C

Around 90

More than that for Tee (used as elbow, entering run)

Less than that for Tee (used as elbow, entering run)

TRUE ANSWER : ?
YOUR ANSWER : ?

Skirt support is the most suitable for supporting __________ vessels.

Tall vertical

Thick walled

Small horizontal

Large horizontal

TRUE ANSWER : ?
YOUR ANSWER : ?