21. Shortest distance between two tubes is
22. $$\frac{{{{\text{L}}_{\text{e}}}}}{{\text{D}}}$$ for a Tee (used as elbow, entering run) would be around
23. A rivetted joint does not fail by __________ of rivets.
24. Overall mass transfer co-efficient in case of absorption of __________ in water is based on the gas film co-efficient only, as the mass transfer process is gas film (phase) controlling.
25. __________ dished head is the strongest of all.
26. Value of Peclet number = ∞, is the representative of
27. For identical operating conditions, the pressure drop over __________ tray is the highest out of the following.
28. The normal range of velocity of steam in pipes is __________ m/sec.
29. 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)
30. Rate of filtrate delivery is inversely proportional to the
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