7441. Tea percolation employs
Liquid-liquid extraction
Leaching
Absorption
None of these
✅ The correct answer is option B.
Chemical Engineering
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7442. Minimum reflux ratio in a distillation column results in
Optimum number of trays
Minimum reboiler size
Maximum condenser size
Minimum number of trays
✅ The correct answer is option C.
7443. Which of the following remains constant during sensible cooling process ?
Specific humidity
Partial pressure of vapour
Both A & B
Neither A nor B
✅ The correct answer is option C.
7444. To remove all the moisture from a wet solid it requires exposure to __________ air.
Perfectly dry
Highly humid
High temperature
None of these
✅ The correct answer is option A.
7445. Experiments were conducted to determine the flux of a species A in a stagnant medium across a gas-liquid interface. The overall mass transfer co-efficient based on the liquid side for dilute systems for the above was estimated to be 4 x 10⁻³ kg mole/m².s. The equilibrium data for the system is given as y = 2x. The flux across the interface (in kg mole/m² .s) for bulk concentrations of A in gas phase and liquid phase as y = 0.4 and x = 0.01 respectively is
5.6 x 10⁻⁴
8.5 x 10⁻⁴
5.6 x 10⁻³
8.5 x 10⁻³
✅ The correct answer is option B.
7446. Solvent extraction is the terminology applied to the liquid-liquid extraction, which is preferred for the separation of the components of liquids, when
Extracting solvent is cheaply & abundantly available
One of the liquid components is heat sensitive
Viscosity of liquid components is very high
One of the liquid components has very high affinity towards the solvent
✅ The correct answer is option D.
7447. In case of __________ distillation, a solvent is added to alter the relative volatility of the mixture to be separated.
Molecular
Azeotropic
Extractive
Flash
✅ The correct answer is option C.
7448. ‘ADDUCTS’ and ‘CLATHRATES’ are used in case of
Extractive distillation
Crystallisation
Absorption
None of these
✅ The correct answer is option B.
7449. During constant rate drying period, vaporisation rate per unit drying surface area
Decreases with time
Increases with time
Does not change with time
Does not affect the moisture content of the wet solid
✅ The correct answer is option C.
7450. Which of the following is a suitable absorbent for removal of H₂S from natural gas?
Vetrocoke solution
Monoethanol amine (MEA)
Dilute
Hot water
✅ The correct answer is option B.