21. Which of the following is not a valid assumption in continuous binary distillation for calculating the number of equilibrium stages by Mc-Cabe-Thiele's method?
22. Practical dividing line between a ductile and brittle materials is suggested, when the ultimate elongation is about 5%. Generally, larger the knuckle radius, stronger is the corner torus section of a head. The knuckle radius provided should be less than __________ of the head.
23. Pressure drop due to pipe fittings can be estimated by the equation, $$\frac{{\Delta {\text{p}}}}{\rho } = 4{\text{f}}.\frac{{{{\text{L}}_{\text{e}}}}}{{\text{D}}}.\frac{{{{\text{V}}^2}}}{{2{\text{gc}}}},$$ where, Le = equivalent length of straight pipeline which will incur the same frictional loss as the fitting and D = diameter of the fitting. The value of $$\frac{{{{\text{L}}_{\text{e}}}}}{{\text{D}}}$$ (dimensionless) for 45° elbow and 180° close return bends would be respectively around
24. Most of the storage vessels/tanks are made cylindrical, because of the fact that a cylinder
25. Seamless pipe is made
26. In a rotary drier, the average retention time of solid is (where Z = length of the drier, metres; ρ = apparent solid density, kg/m3; L = flow rate of dry solids, kg/see.m2 drier cross-section; H = hold up of solid.)
27. The most common standard size of bubble caps used in industrial operation is
28. The circumferential (hoop) stress in a thin walled cylinderical vessel under internal pressure is
29. The longitudinal stress induced in a thin walled cylinderical vessel under internal pressure is
30. In case of design of a shell and tube heat exchanger,
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