61. Freundlich equation applies to the adsorption of solute from
Dilute solutions, over a small concentration range
Gaseous solutions at high pressure
Concentrated solutions
None of these
✅ The correct answer is option A.
Mass Transfer MCQs
62. The absorption factor is defined as (where, L = liquid flow rate, G = gas flow rate and, m = slope of the equilibrium line)
L/mG
G/mL
ML/G
LG/m
✅ The correct answer is option A.
63. Absorption (liquid-gas system) with evolution of heat as compared to isothermal absorption results in
Decreased solute solubility
Large minimum liquid to gas (L/G) ratio
Large number of trays
All of the above
✅ The correct answer is option D.
64. The operating cost of a distillation column at minimum reflux ratio is
Minimum
Maximum
Infinite
Zero
✅ The correct answer is option A.
66. The relation among various mass transfer co-efficients (M.T.C) for ideal gases is given by (where, Kc & Km are M.T.C. for equimolar counter diffusion with concentration & mole fraction respectively as the driving force. and, Kp = M.T.C. for diffusion of a gas through a stagnant inert gas with pressure as driving force.)
Kc = Kp = Km
Kc = Kp/RT = Km . RT/P
Kc = Kp . RT = Km . RT/p
None of these
✅ The correct answer is option C.
67. Hydrogenation of oil is carried out in a/an __________ in Vanaspati manufacturing plant.
Agitated vessel
Sieve tray column
Bubble cap column
Packed tower
✅ The correct answer is option A.
68. The dew point of an unsaturated gas-vapor mixture does not depend upon the __________ of the mixture.
Composition
Temperature
Total pressure
All of the above
✅ The correct answer is option B.
69. The change in enthalpy, when a unit quantity of gas is absorbed by relatively large quantity of adsorbent (on which a definite concentration of the adsorbed gas already exists) is termed as the
Differential heat of adsorption
Heat of wetting
Integral heat of adsorption
None of these
✅ The correct answer is option A.
70. Pick out the wrong statement pertaining to leaching.
Fine solids can not be leached in a Pachuka tank
Door classifier can be used for leaching of coarse solids
Vegetable seeds can be leached in either of Bollman extractor, Rotocel or Kennedy extractor
Very high temperature is not needed for the leaching of sugar beet
✅ The correct answer is option A.