7031. Pore size of the molecular seive 5A is __________ mm.
5
0.5
0.05
50
✅ The correct answer is option B.
Chemical Engineering
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7032. Sodium bicarbonate is produced during soda ash manufacture using a __________ tower.
Plate
Baffle
Packed
None of these
✅ The correct answer is option B.
7033. CO₂ can be absorbed by
Hot cupric oxide
Heated charcoal
Cold Ca(OH)₂
Alumina
✅ The correct answer is option B.
7034. Dry bulb temperature of unsaturated air is more than its __________ temperature.
Dew point
Wet bulb
Both A & B
Neither A nor B
✅ The correct answer is option C.
7035. During drying operation, it is easier to remove the __________ moisture.
Equilibrium
Critical
Unbound
Bound
✅ The correct answer is option C.
7036. __________ diffusion is used for separating the isotopes of methane.
Thermal
Pressure
Concentration
Force
✅ The correct answer is option A.
7037. With increase in solvent rate, the number of transfer units, NtoG, for a fixed degree of absorption from a fixed amount of gas
Increases
Decreases
Decreases linearly
Remains unaffected
✅ The correct answer is option B.
7038. 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.
7039. 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.
7040. If Rm is the minimum reflux ratio, the optimum reflux ratio may be around __________ Rm.
1.2 to 1.5
2.5 to 3
3 to 4
5
✅ The correct answer is option A.