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Mass Transfer

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

Equal to
Twice
Half
More than

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Mass Transfer
Steady state equimolal counter diffusion occurs in case of

Binary phase distillation
Absorption
Liquid-liquid extraction
Leaching

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Mass Transfer
In distillation where q is defined as the moles of liquid flow in the stripping section per mole of feed introduced, for saturated liquid feed

q = 0
q < 1
q = 1
q > 1

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Mass Transfer
Make up water is required in a cooling tower to replace the water lost by

Blowdown and leakage
Drift
Evaporation
All of these

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Mass Transfer
Batch tray dryers suffers from the disadvantage of

High labour cost & low heat economy
All of the listed here
Non-uniform & low production rate
High maintenance cost

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Mass Transfer
HETP is numerically equal to HTU, only when the operating line

Lies below the equilibrium line
And equilibrium lines are parallel
Is far from the equilibrium line
Lies above the equilibrium line

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