- (A) In the McCabe-Thiele diagram for binary distillation, vertical feed line represents saturated liquid feed and horizontal feed line represents saturated vapour feed
- (B) In small columns, local efficiency is larger than Murphree efficiency; in large columns local efficiency is smaller than Murphree efficiency
- (C) For Laminar flow over a plate of length L, the local mass transfer co-efficient at a distance L from the leading edge is 1.5 × 10-2m/s. Then the average mass transfer co-efficient for the plate is 2 × 10-2m/s
- (D) The concentration and hydrodynamic boundary layers over a flat plate are of equal thickness, if Schmidt number is equal to unity
Chemical Engineering Mcqs
- (A) Cellulose acetate membranes are used in dialysis process
- (B) Elutriation process refers to when the soluble material is largely concentrated on the surface of an insoluble solid and is simply washed off by the solvent
- (C) ‘Cascade’ means a group of stages interconnected so that various streams flow from one to another
- (D) Zirconia probe is used for the humidity measurement
- (A) The operating line always lies above the equilibrium solubility curve in case of a single component absorber
- (B) The operating line always lies below the equilibrium solubility curve in case of a single component stripper
- (C) The operating pressure in solvent extraction system should be below vapor pressures of all components
- (D) The solubility of a particular gas in ideal solution in any solvent is always the same
- (A) Critical moisture content is not a property of the material itself
- (B) A sharp increase in pressure drop gives an indication of the flooding in a distillation column
- (C) Separation of components is not possible in liquid extraction, if selectivity is unity
- (D) Dehydration of ethyl alcohol is most economically done by molecular distillation at very high vacuum
- (A) Diffusivity decreases with increase in temperature
- (B) Diffusivity increases with increase in molecular weight
- (C) Diffusivity increases with the size of the individual molecule
- (D) None of these
- (A) Increases
- (B) Decreases
- (C) Remains same
- (D) Either
- (A) Bone charcoal
- (B) Wood charcoal
- (C) Silica gel
- (D) Activated clay
- (A) High pressure drop
- (B) Maldistribution of liquid
- (C) Non-uniformity of packing
- (D) Both
- (A) Ponchan-Savarit method is more accurate than McCabe-Thiele method to determine the number of theoretical stages required for the separation of non-ideal binary system by distillation
- (B) A sharp decrease in pressure drop is an indication of flooding in a distillation coloumn
- (C) Solvent used in extractive distillation should be of high volatility
- (D) Flash distillation is suitable for separating components which have very close boiling temperature
- (A) Dialysis process is used for the production of fresh water from brine
- (B) Electrodialysis is used in the manufacture of NaOH
- (C) Electrodialysis is used for the refining/purification of petrol
- (D) Both
