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Chemical Engineering - Mass Transfer

Exercise : Mass Transfer - Section 4
46.
To get high tray efficiency
interfacial surface between liquid and gas phase should be large.
time of contact between the two phases should be less.
gas velocity should be very low.
liquid entrainment should be severe.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
47.
The mass transfer co-efficient for a solid sphere of radius 'a' dissolving in a large volume of quiescent liquid, in which D is the diffusivity of solute, is
D/a
D/2a
proportional to D
dependent on the Reynolds number
Answer: Option
Explanation:
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48.
Pick out the wrong statement. Generally for physical adsorption, a gas of
higher molecular weight is adsorbed in preference to a gas of low molecular weight.
high critical temperature is adsorbed in preference to a gas of low critical temperature.
low volatility is adsorbed in preference to a gas of high volatility.
none of these.
Answer: Option
Explanation:
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49.
In most of the mechanically agitated liquid-liquid extractors, baffles or horizontal compartmental plates are provided, which helps in
reducing the axial mixing.
increasing the rate of extraction.
maintaining the concentration difference between the two phases.
all 'a', 'b' & 'c'.
Answer: Option
Explanation:
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50.
In a vapor-liquid contacting equipment, the overall gas phase mass transfer co-efficient (M.T.C), KG is related to individual co-efficients (KG and KL) as
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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