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Mass Transfer

Mass Transfer
Milk is dried usually in a __________ dryer.

Rotary
Freeze
Spray
Tray

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Mass Transfer
The most economical range of absorption factor is

2 to 2.5
5 to 10
1.25 to 2
2.5 to 3

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Mass Transfer
Which of the following quantities need not be fixed before starting the design of a co-current absorber?

Flow rate of entering liquid
Heat gain or loss
None of the listed here
Flow rate of gas

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Mass Transfer
The value of NA/(NA + NB), for steady state equimolal counter diffusion of two gases 'A' and 'B' is

0.5
∞
2
1

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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

1
8
9
10

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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
1.25
2.5

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