Mass Transfer Molecular diffusion is caused by the Potential energy of the molecules Transfer of molecules from low concentration to high concentration region Thermal energy of the molecules Activation energy of the molecules Potential energy of the molecules Transfer of molecules from low concentration to high concentration region Thermal energy of the molecules Activation energy of the molecules ANSWER DOWNLOAD EXAMIANS APP
Mass Transfer To get high tray efficiency Gas velocity should be very low Time of contact between the two phases should be less Liquid entrainment should be severe Interfacial surface between liquid and gas phase should be large Gas velocity should be very low Time of contact between the two phases should be less Liquid entrainment should be severe Interfacial surface between liquid and gas phase should be large ANSWER DOWNLOAD EXAMIANS APP
Mass Transfer In liquid extraction, if the selectivity is unity, then Amount of solvent required will be minimum No separation will occur Solvent flow rate should be very low Separation of the constituents is the most effective Amount of solvent required will be minimum No separation will occur Solvent flow rate should be very low Separation of the constituents is the most effective ANSWER DOWNLOAD EXAMIANS APP
Mass Transfer During constant rate period, the rate of drying decreases with the Both A & B Neither A nor B Decrease in air temperature Increase in air humidity Both A & B Neither A nor B Decrease in air temperature Increase in air humidity ANSWER DOWNLOAD EXAMIANS APP
Mass Transfer The relation among various mass transfer co-efficients (M.T.C) for ideal gases is given by (where, Kc & Km are M.T.C. for equimolar counter diffusion with concentration & mole fraction respectively as the driving force. and, Kp = M.T.C. for diffusion of a gas through a stagnant inert gas with pressure as driving force.) Kc = Kp/RT = Km . RT/P None of these Kc = Kp . RT = Km . RT/p Kc = Kp = Km Kc = Kp/RT = Km . RT/P None of these Kc = Kp . RT = Km . RT/p Kc = Kp = Km ANSWER DOWNLOAD EXAMIANS APP
Mass Transfer The most economical range of absorption factor is 2 to 2.5 2.5 to 3 1.25 to 2 5 to 10 2 to 2.5 2.5 to 3 1.25 to 2 5 to 10 ANSWER DOWNLOAD EXAMIANS APP
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