Mass Transfer During constant rate drying period, vaporisation rate per unit drying surface area Does not change with time Does not affect the moisture content of the wet solid Increases with time Decreases with time Does not change with time Does not affect the moisture content of the wet solid Increases with time Decreases with time ANSWER DOWNLOAD EXAMIANS APP
Mass Transfer The humid volume may be increased by increasing the Both A & B Neither A nor B Temperature at constant humidity Humidity at constant temperature Both A & B Neither A nor B Temperature at constant humidity Humidity at constant temperature ANSWER DOWNLOAD EXAMIANS APP
Mass Transfer To get high tray efficiency Time of contact between the two phases should be less Interfacial surface between liquid and gas phase should be large Liquid entrainment should be severe Gas velocity should be very low Time of contact between the two phases should be less Interfacial surface between liquid and gas phase should be large Liquid entrainment should be severe Gas velocity should be very low ANSWER DOWNLOAD EXAMIANS APP
Mass Transfer The mass transfer co-efficient for a solid sphere of radius 'a' dissolving in a large volume of quiescent liquid, in which D is the diffusivity of solute, is D/2a D/a Dependent on the Reynolds number Proportional to √D D/2a D/a Dependent on the Reynolds number Proportional to √D ANSWER DOWNLOAD EXAMIANS APP
Mass Transfer In case of absorption, both the operating and equilibrium lines will be straight for Isothermal operation Dilute solutions and isothermal operation None of these Dilute solutions Isothermal operation Dilute solutions and isothermal operation None of these Dilute solutions ANSWER DOWNLOAD EXAMIANS APP
Mass Transfer If a two phase system is in physical equilibrium; then it means that, the All of these Total pressure throughout the liquid phase is equal to that throughout the vapor phase Escaping tendency of each component from the liquid phase to the vapor phase is exactly equal to that from vapor phase to liquid phase Temperature of the liquid phase is equal to that of the vapor phase All of these Total pressure throughout the liquid phase is equal to that throughout the vapor phase Escaping tendency of each component from the liquid phase to the vapor phase is exactly equal to that from vapor phase to liquid phase Temperature of the liquid phase is equal to that of the vapor phase ANSWER DOWNLOAD EXAMIANS APP
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