- (A) Sieve plate column
- (B) Bubble cap column
- (C) Randomly packed column
- (D) Wetted wall column
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- (A) Festoon
- (B) Cylinder
- (C) Conveyor
- (D) Tunnel
- (A) Enthalpy balance only
- (B) Material balance only
- (C) Both enthalpy and material balances
- (D) The assumption of constant molal-overflow
- (A) Flooding
- (B) Gas viscosity
- (C) Liquid density
- (D) Liquid hold up
- (A) Decreases in winter
- (B) Increases in winter
- (C) Increases in summer
- (D) None of these
- (A) Form a low boiling azeotrope with one of the constituents of the mixture
- (B) Form a new azeotrope of low relative volatility with one of the constituents of the mixture
- (C) Have high latent heat of vaporisation
- (D) Have high viscosity to provide high tray efficiency
- (A) Operating line lies above the equilibrium line
- (B) Operating line lies below the equilibrium line
- (C) Both operating and equilibrium lines are parallel
- (D) Pressure drop in the column is very high
- (A) When the concentration difference for the mass transfer becomes zero at the bottom of the gas absorption tower, then the upper end of the operating line touches the equilibrium curve
- (B) The average distance between the operating line and equilibrium line is large, when the liquidgas ratio is also large in case of a counter current gas absorption tower
- (C) The operating line lies above the equilibrium curve in case of a gas desorber
- (D) With decrease in the liquid flow rate for a fixed gas flow rate, the slope of the operating line decreases, in case of gas absorption process
- (A) In case of liquid-liquid extraction, no separation is possible, if the selectivity of the solvent used is unity
- (B) With increase in temperature, the selectivity of the solvent used in solvent extraction decreases
- (C) The selectivity of solvent used in solvent extraction is unity at the plait point
- (D) All
- (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
