Process Equipment and Plant Design MCQs

Question 1

Column support for the roof of cylindrical storage tank must be provided for

Accepted Answer

Large diameter tanks

Answer

Small diameter tanks

Answer

Small diameter tall tanks

Answer

All of the above

Question 2

Maximum allowable vapour velocity in a bubble cap tower is determined by the

Accepted Answer

Entrainment considerations

Answer

Vapour density

Answer

Diameter of the column

Answer

None of these

Question 3

In packed towers provided with pall rings liquid redistributors are positioned at heights of every 6 metres or 5 - 10 times the column diameter, whichever is less. Maximum size of the pall rings should not exceed __________ of the column diameter.

Accepted Answer

$$\frac{1}{{10}}\,{	ext{to }}{\frac{1}{{15}}^{{	ext{th}}}}$$

Answer

$$\frac{1}{5}\,{	ext{to }}{\frac{1}{{10}}^{{	ext{th}}}}$$

Answer

$$\frac{1}{{20}}\,{	ext{to }}{\frac{1}{{30}}^{{	ext{th}}}}$$

Answer

$$\frac{1}{2}\,{	ext{to }}{\frac{1}{4}^{{	ext{th}}}}$$

Question 4

The wall thickness of thin cylindrical shell with hemispherical ends is __________ that of the spherical ends.

Accepted Answer

More than

Answer

Equal to

Answer

Less than

Answer

Either B or C; depends on maximum permissible internal pressure

Question 5

A shell may by termed as thin if its thickness to diameter ratio is less than 0.1. The factor which can be neglected in the calculation of membrane stresses is

Accepted Answer

Bending

Answer

Deformation

Answer

Shear

Answer

Elongation

Question 6

Friction factor for turbulent flow in a new pipe is given by

Accepted Answer

$${	ext{f}} = \frac{{0.04}}{{{{	ext{N}}_{{	ext{Re}}}}^{0.16}}}$$

Answer

$${	ext{f}} = \frac{{16}}{{{{	ext{N}}_{{	ext{Re}}}}}}$$

Answer

$${	ext{f}} = 0.22\,{{	ext{N}}_{{	ext{Re}}}}^{0.5}$$

Answer

$${	ext{f}} = \frac{{25}}{{{{	ext{N}}_{{	ext{Re}}}}}}$$

Question 7

In the agitators, the power required will be changed with the increase of diameter of agitator (D) as

Accepted Answer

D 5

Answer

D 2

Answer

D

Answer

D 9

Question 8

Liquid gradient over the tray results due to the

Accepted Answer

Resistance offered to flow of liquids by caps & risers and the flow of gas

Answer

Low gas velocity

Answer

Large plate spacing

Answer

Large reflux ratio

Question 9

Lug support is

Accepted Answer

All of the above

Answer

The most suitable for thick vertical vessel

Answer

Same as bracket support

Answer

Provided usually for vessels of much smaller height than skirt supported vessels