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Mass Transfer MCQs

251. The boiling points of pure components of a binary system __________ with increase in total pressure of the system.

Decreases

Increases

Remains unchanged

May increase or decrease, depends on the system

✅ The correct answer is option B.

252. 1 kg of a saturated aqueous solution of a highly soluble component A at 60°C is cooled to 25°C. The solubility limits of A are (0.6 kgA/kg water) at 60°C and (0.2 kgA/kg water) at 25°C. The amount in kg of the crystals formed is

0.4

0.25

0.2

0.175

✅ The correct answer is option C.

253. The temperature of water cooled in cooling tower is always __________ temperature of entering air.

More than the wet bulb

Less than the wet bulb

Equal to the wet bulb

Equal to the dry bulb

✅ The correct answer is option A.

254. The operating line for an absorber is curved, when plotted in terms of

Mole fractions

Mole ratios

Partial pressure

Mass fractions

✅ The correct answer is option C.

255. Which of the following is not fixed by the process requirements, in the design of absorbers?

Flow rate of the entering gas

Composition of the entering liquid

Terminal concentrations of gas stream

None of these

✅ The correct answer is option D.

256. A 25 cm x 25 cm x 1 cm flat sheet weighing 1.2 kg initially was dried from both sides under constant drying rate conditions. It took 1500 seconds for the weight of the sheet to reduce to 1.05 kg. Another 1m x 1m x 1cm flat sheet of the same material is to be dried from one side only.Under the same constant drying rate conditions, the time required for drying (in seconds) from its initial weight of 19.2 kg to 17.6 kg is

1000

1500

2000

2500

✅ The correct answer is option A.

257. The critical moisture content in case of drying indicates the __________ rate period.

Beginning of falling

Beginning of constant

End of falling

None of these

✅ The correct answer is option A.

258. Cox chart, which is useful in the design of distillation column particularly for petroleum hydrocarbons, is a plot of (where, P = vapor pressure, T = temperature)

Log P vs . T

Log P vs. log T

T vs . P

P vs . log T

✅ The correct answer is option A.

259. With increase in gas rate, the number of transfer units, NtoG, for a fixed degree of absorption by a fixed amount of solvent

Increases

Decreases

Decreases linearly

Remains unaffected

✅ The correct answer is option A.

260. When the liquid phase and vapour phase of a binary system obeys Raoult’s and Dalton’s law respectively, the relative volatility is the ratio of

Vapour pressure of component A to that of component B

Vapour pressure of component A to the total pressure

Vapour pressure of component A to the partial pressure of A

Partial pressure of component A to the total pressure

✅ The correct answer is option A.

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