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Mass Transfer

Mass Transfer
If f = moles of vapour present per mole of feed, then the slope of feed line is

- (f - 1)/f
- f/(1 - f)
- 1/f
(1 - f)/f

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Mass Transfer
The suitable evaporator for concentration of foaming liquids is a __________ evaporator.

Vacuum
Short tube
Long tube
Falling film

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Mass Transfer
Pick out the correct relationship. (where, Ri = internal reflux ratio Ro = external reflux ratio. )

(1 - Ro) = Ro/Ri
(1 + Ri) = Ro/Ri
(1 - Ri) = Ro/Ri
(1 + Ro) = Ro/Ri

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Mass Transfer
Reboiler is considered as one theoretical plate, because

None of these
Reboiler itself contains one plate
Of the assumption that vapour and liquid leaving the reboiler are in equilibrium
Vapour is recycled to the column

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

Tray
Rotary
Tunnel
None of these

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Mass Transfer
At the same gas flow rate, the pressure drop in a packed tower being irrigated with liquid __________ that in dry packed tower.

Is lower than
Is greater than
Cannot be predicted as data are insufficient
Is same as

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