Process Equipment and Plant Design The length of straight rectangular weir used on cross-flow trays is generally __________ the column diameter. Equal to Twice 0.6-0.8 times 2 ft irrespective of (for column > 3 ft diameter) Equal to Twice 0.6-0.8 times 2 ft irrespective of (for column > 3 ft diameter) ANSWER DOWNLOAD EXAMIANS APP
Process Equipment and Plant Design 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? Molar latent heat of the two components are equal Heat of mixing of normal liquid is assumed to be zero Sensible heat changes for vapour & liquid are negligibly small Reflux is not a saturated liquid Molar latent heat of the two components are equal Heat of mixing of normal liquid is assumed to be zero Sensible heat changes for vapour & liquid are negligibly small Reflux is not a saturated liquid ANSWER DOWNLOAD EXAMIANS APP
Process Equipment and Plant Design Bracket supports are the most suitable for supporting __________ vessels. Horizontal Thin shperical (e.g. Horton sphere) Thick walled vertical None of these Horizontal Thin shperical (e.g. Horton sphere) Thick walled vertical None of these ANSWER DOWNLOAD EXAMIANS APP
Process Equipment and Plant Design With increase in the reflux ratio for a fixed production from a continuous binary distillation column, the __________ decreases. Fixed charges initially Running cost of steam for reboiler Vapour & liquid load both Running cost of cooling water for condenser Fixed charges initially Running cost of steam for reboiler Vapour & liquid load both Running cost of cooling water for condenser ANSWER DOWNLOAD EXAMIANS APP
Process Equipment and Plant Design To keep the power input constant for a stirred vessel operating under fully developed turbulent flow conditions (constant power number), if the impeller diameter is increased by 20%, the impeller speed should be decreased by a factor of (1.2)5/3 (1.2)3/2 (1.2)3/5 (1.2)2/3 (1.2)5/3 (1.2)3/2 (1.2)3/5 (1.2)2/3 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 45 and 75 180 and 300 5 and 10 300 and 500 45 and 75 180 and 300 ANSWER DOWNLOAD EXAMIANS APP
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