Process Equipment and Plant Design MCQs

Question 1

__________ is the determining factor for the number of bubble caps to be used per tray.

Accepted Answer

Permissible slot velocity

Answer

Tray diameter

Answer

Liquid load

Answer

Vapor load

Question 2

Pick out the wrong statement pertaining to the design of the bubble cap tray of a distillation column to give stable operation and even vapour distribution.

Accepted Answer

None of these

Answer

The pressure drop due to the caps & slots and the static submergence should be as high as practicable for reasonable operation

Answer

Tendency towards stable operation is increased by increasing the skirt clearance of the caps, lowering the rate of liquid flow per unit plate width or increasing the spacing between the caps

Answer

The dimensionless ratio of liquid gradient to pressure drop head caused by the bubble cap assembly should be less than 0.4

Question 3

In a bag filter, the pressure drop increases directly as the

Accepted Answer

Density of the gas and inversely as viscosity of the gas

Answer

Density of the gas, but is independent of the viscosity of the gas

Answer

Viscosity of the gas and inversely as density of the gas

Answer

None of these

Question 4

A high vapour velocity is required for high plate efficiency in a seive plate coloumn. The satisfactory value of operating vapor velocity for design purpose in seive plate column is about __________ percent of the flooding velocity.

Accepted Answer

80

Answer

45

Answer

60

Answer

95

Question 5

In a __________ rivetted joint, the rivets in the various rows are opposite to each other.

Accepted Answer

Chain

Answer

Zig-zag

Answer

Diamond

Answer

None of these

Question 6

The maximum liquid gradient over a tray must not exceed

Accepted Answer

0.5" -1.25"

Answer

2"-3.5"

Answer

5"

Answer

Half the tray spacing

Question 7

For a 25 mm hole drilled in plates to be rivetted, the shank diameter of the rivet should be __________ mm.

Accepted Answer

23

Answer

25

Answer

26

Answer

27

Question 8

Lap joints are preferred for plates having thickness __________ mm.

Accepted Answer

> 3

Answer

< 12.5

Answer

> 5

Answer

5-10

Question 9

For a cylindrical shell, (subject to the thickness of uppermost course being more than the minimum for diaofthe tank in question), the thickness of the courses of shell

Accepted Answer

Decreases upwards

Answer

Increases upwards

Answer

Remains same throughout

Answer

May decrease or increase upwards depending upon whether vacuum or positive pressure would be maintained inside the shell