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Mass Transfer

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

More than
Twice
Half
Equal to

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Mass Transfer
In extractive distillation, solvent is

Present in overhead stream
Of high viscosity to give high tray efficiency
Added to alter the relative volatility of the mixture
Of high volatility

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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 < 1
q = 1
q = 0
q > 1

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Mass Transfer
The minimum number of theoretical plates is required for achieving a given separation in distillation column with

Total reflux
Minimum reflux ratio
Zero reflux ratio
No reflux

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Mass Transfer
Which of the following processes is followed by unsaturated air (with dry bulb temperature 12°C and relative humidity 47%) passing through water spray washer (temperature of water being constant at 40°C?

Heating only
Both heating and humidification
Humidification only
Evaporative cooling

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Mass Transfer
The unit of volumetric diffusivity is

Cm²/sec
Cm²/seC₂
Cm³/sec
Cm/sec

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