Process Equipment and Plant Design
In case of design of a shell and tube heat exchanger,

Minimum tube sheet thickness (in which tubes are fixed) is equal to the O.D. of the tube upto 15 mm tube diameter; and for > 15 mm tube diameter, tube sheet thickness is smaller than tube diameter
O.D. of the tube is 6 to 40 mm while the tube lengths used are 0.5, 2.5, 3.0, 4.0, 5.0, 6 metres
All of these
Minimum cleaning lane of 6.5 mm is provided, when tubes are on a square pitch

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Process Equipment and Plant Design
For turbulent flow (NRe > 2100) of low viscosity fluid (μ > 20cp) in steel pipes, the optimum inside pipe diameter is given by(where, Q = fluid flow rate, ft³/sec.ρ = fluid density, lb/ft³ μ = fluid viscosity, centipoise Di = optimum inside pipe diameter, inches)

Di, opt = 3.9 Q0.45 . μ0.95
Di, opt = 3 Q0.36 . μ0.88
Di, opt = 3.9 Q0.45 ρ0.13
Di, opt = 4.7 Q0.36 . μ3.2ρ0.13

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Process Equipment and Plant Design
Pick out the wrong statement pertaining to the design of the distillation column.

The purpose of the slot is to disperse the gas into the liquid in the form of small bubbles
If sufficient slot area is not provided, the gas may pass through the skirt clearance
Generally, a skirt clerance of 0.5" to 1.5' is recommended to prevent plugging of the slots by residue build up
None of these

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