Mass Transfer MCQs

Chemical Engineering Objective Questions

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134. With increase in temperature, the leaching rate increases because of the

A. Increased diffusivity

B. Decreased viscosity of liquid

C. Both A and B

D. Neither A nor B

135. Flash distillation is suitable for the separation of components

A. Having very close boiling points

B. Which form maximum boiling azeotrope

C. Having very wide boiling points

D. Which form minimum boiling azeotrope

136. In saturated gas, the

A. Vapour is in equilibrium with the liquid at the gas temperature

B. Vapour is in equilibrium with the liquid at the room temperature

C. Partial pressure of vapour equals the vapour pressure of the liquid at room temperature

D. None of these

137. The relative volatility of a binary mixture at the azeotropic composition is

138. It takes 6 hours to dry a wet solid from 50% moisture content to the critical moisture content of 15%. How much longer it will take to dry the solid to 10% moisture content, under the same drying conditions? (The equilibrium moisture content of the solid is 5%).

139. Extraction of pencillin employs a __________ extraction coloumn.

D. None of these

140. The minimum liquid rate to be used in an absorber corresponds to an operating line

A. Of slope = 1

B. Of slope = 0.1

C. Tangential to the equilibrium curve

D. None of these

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