Chemical Engineering Mcqs

A pure drug is administered as a sphere and as a cube. The amount of drug is the same in the two tablets. Assuming that the shape and size do not influence the mass transfer, the ratio of rate of dissolution in water at t = 0 for the cubic to spherical tablet is___________________?

• (A)  0.54
• (B)  1.04
• (C)  1.24
• (D)  1.94

Answer

Submitted By :Ali Uppal

With increase in temperature, the mutual solubility of two liquids___________________?

• (A)  Increases
• (B)  Decreases
• (C)  Remains unchanged
• (D)  Decreases exponentially

Answer

Submitted By :Ali Uppal

Dorr thickener is an equipment used for___________________?

• (A)  Classification
• (B)  Sedimentation
• (C)  Clarification
• (D)  Leaching

Answer

Submitted By :Ali Uppal

Can the efficiency of a plate in the distillation tower be greater than 100% ?

• (A)  Yes
• (B)  Normally not; but is possible if infinite number of plates are put
• (C)  Never
• (D)  Yes; if the reflux ratio is maximum

Answer

Submitted By :Ali Uppal

Absorption (liquid-gas system) with evolution of heat as compared to isothermal absorption results in_________________?

• (A)  Decreased solute solubility
• (B)  Large minimum liquid to gas (L/G) ratio
• (C)  Large number of trays
• (D)  All

Answer

Submitted By :Ali Uppal

Reverse osmosis is also called_________________?

• (A)  Dialysis
• (B)  Electrodialysis
• (C)  Diffusion
• (D)  Ultra-filtration

Answer

Submitted By :Ali Uppal

Laboratory determination of the diffusivity of vapor is done by __________________ method?

• (A)  Wetted wall column
• (B)  Gilliland’s
• (C)  Winkelmann’s
• (D)  Wike’s

Answer

Submitted By :Ali Uppal

Paper industry employs _______________ driers?

• (A)  Cylinder
• (B)  Rotary
• (C)  Spray
• (D)  Fluidised bed

Answer

Submitted By :Ali Uppal

Use of packed towers for distillation is generally limited to the____________________?

• (A)  Small sizes
• (B)  Multi-component distillation
• (C)  High pressure operation
• (D)  Vacuum distillation

Answer

Submitted By :Ali Uppal

For a single component absorber, the operating line is straight only when plotted in term of ______________ units?

• (A)  Partial pressure
• (B)  Mole ratio
• (C)  Mole fraction
• (D)  None of these

Answer

Submitted By :Ali Uppal