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Mass Transfer

Mass Transfer
The relative volatility of a binary mixture at the azeotropic composition is

∞
> 1
1

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Mass Transfer
When the feed to a distillation column is a saturated liquid, slope of the feed line is

None of these
Zero
Unity
Infinity

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Mass Transfer
A natural draft cooling tower is filled with wooden grids, which covers about __________ percent of the tower height.

44119
30-40
70-80
90-100

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Mass Transfer
If Rm is the minimum reflux ratio, the optimum reflux ratio may be around __________ Rm.

5
1.2 to 1.5
3 to 4
2.5 to 3

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Mass Transfer
H₂S is being absorbed in a gas absorber unit. The height of the transfer unit based on the overall mass transfer coefficient on the gas side is 0.4 m. The equilibrium data is given by, y = 1.5 x. The bulk concentration of H₂S has to be reduced from 0.05 to 0.001 mole fraction in the gas side. The height of the tower (in metres) corresponding to an operating line given by, y = 5x + 0.001 is

2
0.56
1.56
1

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Mass Transfer
The binary diffusivity in gases at atmospheric conditions is about

10-9 cm/sec
10-4 cm²/seC₂
10-1 cm²/sec
10-3 sec/cm

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