Process Equipment and Plant Design Normally, the length to diameter ratio of rotary dryers varies form 4 to 10 and for its economic operation, the number of transfer units (NTU) for such dryers varies from 3.5-5.5 7.5-10.0 44119 1.5-2.5 3.5-5.5 7.5-10.0 44119 1.5-2.5 ANSWER DOWNLOAD EXAMIANS APP
Process Equipment and Plant Design Value of Peclet number = ∞, is the representative of Laminar flow Complete back mixing Plug flow Eddy diffusivity = 0 Laminar flow Complete back mixing Plug flow Eddy diffusivity = 0 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 300 and 500 5 and 10 180 and 300 45 and 75 300 and 500 5 and 10 180 and 300 45 and 75 ANSWER DOWNLOAD EXAMIANS APP
Process Equipment and Plant Design It is not desirable to design a heat exchanger for LMTD correction factor, FT, of less than 0.55 0.99 0.8 0.95 0.55 0.99 0.8 0.95 ANSWER DOWNLOAD EXAMIANS APP
Process Equipment and Plant Design Excessive liquid gradient on a tray may result in the Gas blowing beneath cap skit All of these Back trapping Maldistribution of gas Gas blowing beneath cap skit All of these Back trapping Maldistribution of gas ANSWER DOWNLOAD EXAMIANS APP
Process Equipment and Plant Design Back-trapping in a distillation column results due to Excessive liquid gradient over the tray High gas velocity Low reflux ratio Low gas velocity Excessive liquid gradient over the tray High gas velocity Low reflux ratio Low gas velocity ANSWER DOWNLOAD EXAMIANS APP
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