81. Which of the following is not a graphical method (but is an analytical method) for the calculation of theoretical number of stages in case of continuous binary distillation?
82. Pick out the wrong statement pertaining to the use of valve tray, seive tray and bubble cap trays in continuous distillation column.
83. $$\frac{{{{\text{L}}_{\text{e}}}}}{{\text{D}}}$$ for fully open globe value may be around
84. In packed towers provided with saddle packing, liquid redistributors are positioned at every __________ times column diameter or 6 metres whichever is less.
85. __________ shapedroof is the most commonly used roof for cylinderical storage tanks.
86. Speed of industrial paddle agitator ranges from __________ rpm.
87. Which of the following lengths of heat exchanger tubes are normally not used in practice?
88. Cylindrical pressure vessels in horizontal condition is generally supported on a __________ support.
89. __________ closure is the weakest enclosure for cylindrical vessels.
90. The centre to centre distance between two consecutive baffles in a shell and tube heat exchanger is called the baffle pitch or baffle spacing, which is more than $${\frac{1}{5}^{{\text{th}}}}$$ the I.D. of the shell. Which of the following is not a function of the baffles?
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