Search
.Management Sciences
Category: Mass Transfer
Mass transfer co-efficient is directly proportional to DAB according to the __________ theory?
A. Film
B. Penetration
C. Surface-renewal
D. None of these
In a distillation column, with increase in the reflux ratio, the heat removed in the cooler ______________________?
A. Increases
B. Decreases
C. Remains unaffected
D. And the heat required in reboiler decreases
The binary diffusivity in gases at atmospheric conditions is about ___________________?
A. 10-9 cm/sec
B. 10-1 cm2/sec
C. 10-3 sec/cm
D. 10-4 cm2/sec2
Condensation of a vapour-gas mixture just begins, when (where, p = partial pressure of the vapour P = vapour pressure of the liquid) ?
A. p = P
B. p >>P
C. p < P
D. p << P
The individual mass transfer co-efficients (moles/m2s) for absorption of a solute from a gas mixture into a liquid solvent are, KL = 4.5 and KG = 1.5. The slope of the equilibrium line is 3. Which of the following resistance (s) is (are) controlling ?
A. Liquid side
B. Gas side
C. Interfacial
D. Both liquid and gas side
Pick out the wrong statement?
A. Packed towers are preferred for vacuum operation, because the pressure drop through the
packing is less and they (packings) also lessen the possibility of tower wall collapse
B. Packed towers are preferred over plate towers for handling corrosive and foamy liquids
C. Diameter of randomly packed tower is normally more than 1.2 metres
D. Due to uneven supply and improper distribution of liquid, problem of channelling, loading &
flooding is generally encountered in packed towers
In McCabe-Thiele method, at infinite reflux ratio________________?
A. The overhead product is minimum
B. Both the operating lines coincide with diagonal
C. Both A. and B.
D. Neither A. nor B.
A slurry is to be dried to produce flaky solid. Which dryer would you recommend ?
A. Spray dryer
B. Drum dryer
C. Rotary dryer
D. Dielectric dryer
Recent Comments