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Mass Transfer

Mass Transfer
__________ column is preferred to be used, when a high liquid hold up is required in a reactor for gas-liquid reaction.

Spray
Bubble
Packed
Tray

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

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Mass Transfer
Operating velocity in a packed tower is usually __________ the flooding velocity.

More than
Half
Equal to
Twice

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Mass Transfer
For a single component absorber, the operating line is straight only when plotted in term of __________ units.

None of these
Mole fraction
Partial pressure
Mole ratio

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Mass Transfer
At 750°K and 1 atm, the approximate value of Schmidt number for air is

1
0.1
10
0.01

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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.

20
18.7
21.7
27.3

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