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Chemical Engineering Objective Questions { Mass Transfer }



288. Moisture contained by a substance in excess of the equilibrium moisture is called the __________ moisture.
A. Unbound
B. Free
C. Critical
D. Bound
Discussion
289. Drying operation under vacuum is carried out to
A. Dry those materials which have very high unbound mositure content
B. Reduce drying temperature
C. Increase drying temperature
D. Dry materials having high bound moisture content
Discussion
290. Pick out the wrong statement.
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
Discussion
291. An azeotropic mixture is a __________ mixture.
A. Binary
B. Ternary
C. Constant boiling point
D. None of these
Discussion
292. Drying of refractory is normally carried out in a __________ dryer.
A. Open pan
B. Tray
C. Rotary vacuum
D. Truck/tunnel
Discussion
293. Gaseous diffusivity at atmospheric pressure is of the order of __________ cm2/second.
A. 1
B. 1 to 5
C. 5 to 10
D. > 10
Discussion
294. When both the fluids flow concurrently in an absorber, the slope of the operating line is
A. - ve
B. + ve
C. 1
D. -1
Discussion

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