41. The minimum shell thickness for tank ≤ 15 metres diameter is limited to __________ mm, for reasons of elastic stability.
42. Diameter of rivet hole (d, mm) and the plate thickness (t, mm) are related by Unwin's formula as
43. In a shell and tube heat exchanger, the overall heat transfer co-efficient is proportional to the tube side (volumetric flow rate)0.8. This is valid, only when the ratio of the tube side film resistance to the total resistance is almost equal to
44. The retention time of material in a rotary dryer depends upon its
45. In case of bubble cap distillation column of diameter greater than 1.2 metres, the cap diameter is roughly about __________ cms.
46. For a cylinderical internally pressurised vessel, which of the following closure types would withstand highest pressure, if each closure is of the same material and thickness?
47. Triangular pitch tube layout as compared to square pitch in a shell and tube heat exchanger
48. In shell and tube heat exchangers, straight tie rods are used to
49. In actual operation of a bubble cap distillation tower, the __________ at the bottom of the tower is more than that at the top of the tower.
50. Generally, as the length of the liquid path on a tray is increased beyond 5 ft, the overall column efficiency
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