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Mass Transfer

Mass Transfer
Mass transfer co-efficient varies as DAB0.5, according to the __________ theory.

Penetration
Surface renewal
Film
None of these

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Mass Transfer
A mixture of 10% C₆H₆ vapour in air at 25°C and 750 mm Hg has a dew point of 20°C. Its dew point at 30°C and 700 mm Hg will be around __________ °C.

21.7
20
18.7
27.3

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Mass Transfer
For continuous drying of grannular or crystalline material, the dryer used is the __________ dryer.

Tunnel
None of these
Rotary
Tray

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Mass Transfer
In a single stage extraction process, 10 kg of pure solvent S (containing no solute A) is mixed with 30 kg of feed F containing A at a mass fraction xf = 0.2. The mixture splits into an extract phase E and a raf-finate phase R containing A at xB = 0.5 and xR = 0.05 respectively. The total mass of the extract phase is (in Kg)

10
8.89
6.89
8.25

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Mass Transfer
Which of the following plays an important role in problems of simultaneous heat and mass transfer?

Schmidt number
Prandtl number
Sherwood number
Lewis number

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Mass Transfer
In McCabe-Thiele method of theoretical plate calculation for a distillation column, the operating lines of stripping and rectifying sections coincide with the diagonal at __________ reflux.

Total
Maximum permissible
Minimum
Operating

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