7051. Chemisorption compared to physical absorption has
Lower adsorption rate
Lower capacity of the solvent for the solute gas
Increased utilisation of stagnant zones of the liquid phase
None of these
✅ The correct answer is option C.
Chemical Engineering
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7052. For experimental determination of mass transfer co-efficient by wetted wall tower, the mass transfer area is
Calculated
Unknown
Known
Not required
✅ The correct answer is option C.
7053. Lewis number, which is important in problems involving simultaneous heat and mass transfer, is the ratio of
Mass diffusivity to momentum diffusivity
Thermal diffusivity to mass diffusivity
Momentum diffusivity to thermal diffusivity
None of these
✅ The correct answer is option B.
7054. __________ extractor uses centrifugal force for separating the two phases.
Treybal
Schiebel
Podbielniak
None of these
✅ The correct answer is option C.
7055. Tray spacing in a distillation column of dia 10-12 ft. used in petroleum refinery may be around __________ inches.
5
30
60
100
✅ The correct answer is option B.
7056. At the same gas flow rate, the pressure drop in a packed tower being irrigated with liquid __________ that in dry packed tower.
Is greater than
Is lower than
Is same as
Cannot be predicted as data are insufficient
✅ The correct answer is option A.
7057. Occurrence of ‘case hardening’ during drying of a high moisture solid cake __________ the drying rate.
Increases
Decreases
Does not affect
Exponentially increases
✅ The correct answer is option B.
7058. Unsaturated air (with dry and wet bulb temperatures being 35 and 25°C respectively) is passed through water spray chamber maintained at 35°C. The air will be
Cooled
Humidified
Both A & B
Dehumidified
✅ The correct answer is option B.
7059. Unsaturated air (with dry bulb and wet bulb temperatures being 45°C and 25°C respectively) is passed through a water spray chamber maintained at 23°C. The air will be cooled and
Humidified with wet bulb temperature decreasing
Humidified at constant wet bulb temperature
Dehumidified
None of these
✅ The correct answer is option A.
7060. For water-ethanol system, the minimum reflux ratio
Is computed from the slope of the upper operating line that is tangent to the equilibrium curve
Is computed from the intercept of the operating line
Cannot be computed
Is the optimum reflux ratio
✅ The correct answer is option A.