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Mass Transfer

Mass Transfer
The rough value of diffusion co-efficient of water vapor into air at 25°C may be about __________ cm²/sec.

0.25
0.0025
2.5
1.25

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Mass Transfer
At minimum reflux ratio for a given separation

Separation is most efficient
Minimum number of the theoretical plates is required
Number of plates is infinity
Number of plates is zero

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Mass Transfer
The value of L/mG ratio for economical absorption operation ranges from

0.8 to 1.2
2.5 to 3.5
1.25 to 2.0
0.5 to 0.8

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Mass Transfer
Acetone is to be removed from air in an isothermal dilute absorber using pure water as solvent. The incoming air contains 5 mole% of acetone (yin = 0.05). The design equation to be used for obtaining the number of trays (N) of the absorber is, N+2 = 6 log (yin/yout).For 98% recovery of acetone, the number of trays required is/are

10
8
9
1

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Mass Transfer
In triangular co-ordinates, the ternery composition point falls __________ of the triangle.

None of these
Inside
In the corners
On the sides

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Mass Transfer
On moving the feed line (q-line) from saturated liquid feed (vertical position) to saturated vapor feed (horizontal feed), if the slope of both the operating lines are to be increased, then it will result in

Greater degree of separation with a fixed number of trays
Increased reflux ratio
Increased reboiler load
None of these

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