Process Equipment and Plant Design Which of the following packing materials provides for maximum mass transfer? Raschig rings All of these Lessig rings Cross-partition rings Raschig rings All of these Lessig rings Cross-partition rings ANSWER DOWNLOAD EXAMIANS APP
Process Equipment and Plant Design In a double pipe (concentric) heat exchanger, the hydraulic radius for heat transfer (for a fluid flowing through the annulus) would be Same as that for fluid flow More than that for fluid flow D₂ - D₁ (D₁ and D₂ are I.D. of inner and outer pipes respectively) Less than that for fluid flow Same as that for fluid flow More than that for fluid flow D₂ - D₁ (D₁ and D₂ are I.D. of inner and outer pipes respectively) Less than that for fluid flow ANSWER DOWNLOAD EXAMIANS APP
Process Equipment and Plant Design A pipe is generally made of circular cross-section, because a circular cross-section has the Both A & B Higher structural strength Lowest surface area requirement for a given volume None of these Both A & B Higher structural strength Lowest surface area requirement for a given volume None of these ANSWER DOWNLOAD EXAMIANS APP
Process Equipment and Plant Design The maximum liquid gradient over a tray must not exceed 0.5" -1.25" Half the tray spacing 2"-3.5" 5" 0.5" -1.25" Half the tray spacing 2"-3.5" 5" ANSWER DOWNLOAD EXAMIANS APP
Process Equipment and Plant Design Pressure drop due to pipe fittings can be estimated by the equation, ΔP/p = 4f.Le/D.V2/2gc, 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 Le/D (dimensionless) for 45° elbow and 180° close return bends would be respectively around 5 and 10 300 and 500 180 and 300 45 and 75 5 and 10 300 and 500 180 and 300 45 and 75 ANSWER DOWNLOAD EXAMIANS APP
Process Equipment and Plant Design The wall thickness for a large high pressure pipeline is determined by the consideration of the Forces exerted by static and dynamic action at bends Axial tensile stress in the pipe Circumferential pipewall tension Temperature stresses Forces exerted by static and dynamic action at bends Axial tensile stress in the pipe Circumferential pipewall tension Temperature stresses ANSWER DOWNLOAD EXAMIANS APP
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