Mass Transfer Gaseous diffusivity at atmospheric pressure is of the order of __________ cm²/second. 5 to 10 > 10 1 1 to 5 5 to 10 > 10 1 1 to 5 ANSWER DOWNLOAD EXAMIANS APP
Mass Transfer In a moderately sized packed absorption tower, channeling (which is most severe with stacked packings) can be minimised by taking the ratio of tower diameter to packing diameter > 4 :1 < 6:1 < 8 : 1 > 8:1 > 4 :1 < 6:1 < 8 : 1 > 8:1 ANSWER DOWNLOAD EXAMIANS APP
Mass Transfer For the gas absorption, the height of a transfer unit, based on the gas phase is given by (G: superficial molar gas velocity, L: superficial molar liquid velocity, FG:mass transfer co-efficient, mols/m² , a: in-terfacial area per unit volume of tower) F/(FG.a) FG/(G.a) L/(FG.G) (G.a)/FG F/(FG.a) FG/(G.a) L/(FG.G) (G.a)/FG ANSWER DOWNLOAD EXAMIANS APP
Mass Transfer The individual mass transfer co-efficients (moles/m² . s) for absorption of a solute from a gas mixture into a liquid solvent are, KL = 4.5 and KG = 1.5. The slope of the equilibrium line is 3. Which of the following resistance (s) is (are) controlling ? Liquid side Gas side Both liquid and gas side Interfacial Liquid side Gas side Both liquid and gas side Interfacial ANSWER DOWNLOAD EXAMIANS APP
Mass Transfer During constant rate drying period, vaporisation rate per unit drying surface area Decreases with time Does not affect the moisture content of the wet solid Does not change with time Increases with time Decreases with time Does not affect the moisture content of the wet solid Does not change with time Increases with time ANSWER DOWNLOAD EXAMIANS APP
Mass Transfer Diffusivity in concentrated solutions differs from that in dilute solutions, because of the changes in Viscosity with concentration Neither A nor B Degree of ideality of the solution Both A & B Viscosity with concentration Neither A nor B Degree of ideality of the solution Both A & B ANSWER DOWNLOAD EXAMIANS APP
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