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Mass Transfer

Mass Transfer
Large scale drying of wheat is done in a __________ dryer.

Spouted bed
Fluidised bed
Vacuum rotary
Tray

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

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Mass Transfer
H₂S present in naphtha reformed gas is removed by absorbing with

Ethanolamine
K₂CO₃
Vacuum gas oil
HCl

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Mass Transfer
When both the fluids flow concurrently in an absorber, the slope of the operating line is

1
-1
+ ve
- ve

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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

1.56
0.56
1
2

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Mass Transfer
Occurrence of 'case hardening' during drying of a high moisture solid cake __________ the drying rate.

Does not affect
Decreases
Increases
Exponentially increases

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