7241. In a binary system, separation is very efficient, when the relative volatility is
1
> 1
< 1
0.5
✅ The correct answer is option B.
Chemical Engineering
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7242. Raschig ring made of procelain cannot be used for treating concentrated
Hydrochloric acid
Nitric acid
Alkalis
Sulphuric acid
✅ The correct answer is option C.
7244. Condensation of a vapour-gas mixture just begins, when (where, p = partial pressure of the vapour P = vapour pressure of the liquid )
P = P
P >>P
P < P
P << P
✅ The correct answer is option A.
7245. A solid material shows case hardening properties while drying. Which of the following should be controlled to control the drying process?
Flow rate of inlet air
Relative humidity of outlet air
Humidity of inlet air
Temperature of the solid
✅ The correct answer is option D.
7246. In McCabe-Thiele method of theoretical plate calculation for a distillation column, the operating lines of stripping and rectifying sections coincide with the diagonal at __________ reflux.
Total
Minimum
Operating
Maximum permissible
✅ The correct answer is option A.
7247. __________ temperature is the steady state temperature attained by a small amount of liquid evaporating into a large quantity of unsaturated gas-vapor mixture.
Dry bulb
Wet bulb
Dew point
None of these
✅ The correct answer is option B.
7248. In the absorption of ammonia in water, the main resistance to absorption is by the __________ phase.
Liquid
Gas
Both A & B
Neither A nor B
✅ The correct answer is option B.
7249. Schimdt number and Lewis number for pure air at atmospheric conditions are respectively
< 1 and ≈ 1
1 and 0
>1 and ≈ 1
0 and ≈ 1
✅ The correct answer is option A.
7250. Plate efficiency
Is a function of the mass transfer between liquid and vapour
Increases due to foaming
Increases due to liquid entrainment
Increases due to weeping and dumping of liquid
✅ The correct answer is option A.