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Process Equipment and Plant Design

Process Equipment and Plant Design
The ratio of tube length to shell diameter in case of liquid shell and tube heat exchanger ranges from

2 to 3
3 to 5
6 to 12
4 to 8

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Process Equipment and Plant Design
In a rotary drier, the average retention time of solid is(where Z = length of the drier, metres ρ = apparent solid density, kg/m³ L = flow rate of dry solids, kg/see. m² drier cross-section H = hold up of solid.)

Z.H.ρ/L
L/Z.H.ρ
Z.H/L.ρ
H.ρ/L

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Process Equipment and Plant Design
An adequate clearance between the tray and the shell wall of a distillation column is provided to

Drain the liquid from the tray when the unit is not in operation
Avoid back-trapping
None of these
Allow for thermal expansion and facilitate installation

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Process Equipment and Plant Design
In distillation columns, bubble caps are held in place over trays by

Bolts
Both B and C
A hold down bar
Rivets

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Process Equipment and Plant Design
The equivalent diameter for fluid flow through a channel of constant non-circular cross section of area 'A' is given by (where, P = perimeter of the channel in contact with the fluid)

A/P
√A
4 P/A
4 A/P

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Process Equipment and Plant Design
What is the slope of the feed line, if the feed to a distillation column is a saturated liquid?

∞
< 1
> 1

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