71. Tubes are fixed to the tube sheet (a thick circular metallic plate) by the method of tube rolling and brazing (non-removable) or ferrule connection (removable). Thickness of the tube, sheet is normally __________ the outside diameter of the tube but in no case it should be less than 22 mm $$\left( {{{\frac{7}{8}}^{''}}} \right).$$
72. Two iron pipes of the same nominal diameter but different schedule numbers will have the same
73. $$\frac{{{{\text{L}}_{\text{e}}}}}{{\text{D}}}$$ for fully open gate valves would be
74. Pick out the wrong statement about the design of seive plate column and the bubble cap column.
75. __________ tray arrangement is recommended for distillation column having diameter upto 4 ft.
76. Hole diameter of the seive trays in the distillation column ranges from __________ mm.
77. With increase in the reflux ratio for a fixed production from a continuous binary distillation column, the __________ decreases.
78. In a shell and tube heat exchanger for a given heat transfer surface area, smaller diameter tubes are favoured as compared to larger diameter ones ; because the smaller diameter tubes
79. Liquid gradient over a tray can be minimised by
80. Needle valves are generally not used for
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