Process Equipment and Plant Design
Le/D for a Tee (used as elbow, entering branch) would be

More than that for Tee (used as elbow, entering run)
Around 90
Both B and C
Less than that for Tee (used as elbow, entering run)

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Process Equipment and Plant Design
Pick out the wrong statement pertaining to the design of a basket type evaporator.

The tube bundle is suspended on bracket
There is no central downtake
Downtake is formed by the annular space between the bundle and the shell
It is used for high viscosity liquor having large rate of scaling

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Process Equipment and Plant Design
Overall distillation column efficiency for most of the refinery columns can be given by (for μ = 0.07 - 1.4 cp and relative volatility < 4) (where η = overall column efficiency, % μ = molal average viscosity of feed at average column temperature and pressure, cp Δp = pressure drop per tray, psi)

Η = 24.6 (Δp/μ)
Η = 1.66 - 0.25 log μ
Η = 0.25 log μ - 1.67
Η = 17 - 61.1 log μ

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