Practice Test: Question Set - 33
1. Smoke is an example of
- (A) Solid
dispersed in liquid
- (B) Solid
dispersed in gas
- (C) Liquid
dispersed in gas
- (D) Gas
dispersed in liquid
2. Low viscosity absorbent is preferred for reasons of
- (A) Rapid
absorption rates and good heat transfer characteristics
- (B) Improved
flooding characteristics
- (C) Low
pressure drop on pumping
- (D) All (a), (b) and (c)
3. Pick out the wrong statement.
- (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
4. The wetted wall tower is used to determine
- (A) Individual mass
transfer co-efficient (M.T.C.) in gaseous system
- (B) M.T.C. of individual
components in a liquid-liquid system
- (C) M.T.C. of liquid in
liquid-gas system
- (D) The overall M.T.C. of
the system
5. Rotary dryers cannot handle __________ materials.
- (A) Free flowing
- (B) Dry
- (C) Sticky
- (D) Granular
6. In a solution containing 0.30 Kg mole of solute and 600 kg of solvent, the molality is
- (A) 0.50
- (B) 0.60
- (C) 1
- (D) 2
7. Small dia distillation column can be a
- (A) Packed column
- (B) Sieve tray
- (C) Bubble cap
- (D) Any of these
8. Prandtl number for water at 20°C is about
- (A) 7
- (B) 70
- (C) 0.7
- (D) 150
9. Relative volatility does not change appreciably with the change in
- (A) Temperature
- (B) Vapor pressure of
either component
- (C) Total pressure
- (D) None of these
10. The difference of wet bulb temperature and adiabatic saturation temperature of unsaturated mixture of any system is
- (A) +ve
- (B) -ve
- (C) Zero
- (D) None of these
11. A minimum boiling azeotrope is exemplified by
- (A) Toluene-benzene
- (B) Acetone-carbon
disulphide
- (C) Water-isobutyl
alcohol
- (D) None of these
12. Moisture in a substance exerting an equilibrium vapor pressure less than that of pure liquid at the same temperature is called the __________ moisture.
- (A) Bound
- (B) Unbound
- (C) Critical
- (D) None of these
13. Which is the controlling factor for a drum drier?
- (A) Diffusion
- (B) Heat transfer
- (C) Both (a) and (b)
- (D) Neither (a) nor (b)
14. 1 kg of a saturated aqueous solution of a highly soluble component A at 60°C is cooled to 25°C. The solubility limits of A are (0.6 kgA/kg water) at 60°C and (0.2 kgA/kg water) at 25°C. The amount in kg of the crystals formed is:
- (A) 0.4
- (B) 0.25
- (C) 0.2
- (D) 0.175
15. Which of the following is not a continuous drier?
- (A) Drum drier
- (B) Spray drier
- (C) Tunnel drier
- (D) Tray drier
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