Mass Transfer During constant rate drying period, vaporisation rate per unit drying surface area Increases with time Does not change with time Decreases with time Does not affect the moisture content of the wet solid Increases with time Does not change with time Decreases with time Does not affect the moisture content of the wet solid ANSWER DOWNLOAD EXAMIANS APP
Mass Transfer Schimdt number and Lewis number for pure air at atmospheric conditions are respectively >1 and ≈ 1 0 and ≈ 1 1 and 0 < 1 and ≈ 1 >1 and ≈ 1 0 and ≈ 1 1 and 0 < 1 and ≈ 1 ANSWER DOWNLOAD EXAMIANS APP
Mass Transfer If G = insoluble gas in gas stream and L = non-volatile solvent in liquid stream, then the slope of the operating line for the absorber is L/G Always < 1 None of these G/L L/G Always < 1 None of these G/L ANSWER DOWNLOAD EXAMIANS APP
Mass Transfer The absorption factor is defined as (where, L = liquid flow rate, G = gas flow rate and, m = slope of the equilibrium line) L/mG LG/m ML/G G/mL L/mG LG/m ML/G G/mL ANSWER DOWNLOAD EXAMIANS APP
Mass Transfer Diffusivity in concentrated solutions differs from that in dilute solutions, because of the changes in Viscosity with concentration Degree of ideality of the solution Both A & B Neither A nor B Viscosity with concentration Degree of ideality of the solution Both A & B Neither A nor B ANSWER DOWNLOAD EXAMIANS APP
Mass Transfer Mass transfer co-efficient (K) and diffusivity (D) are related according to film theory as K ∝ D1.5 K ∝ D2 K ∝ D K ∝ √D K ∝ D1.5 K ∝ D2 K ∝ D K ∝ √D ANSWER DOWNLOAD EXAMIANS APP
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