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Mass Transfer

Mass Transfer
When the feed to a distillation column is a saturated liquid, slope of the feed line is

Unity
None of these
Zero
Infinity

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Mass Transfer
The surface renewal frequency in Danckwerts model of mass transfer is given by (KL: mass transfer co-efficient)

KL/DA²
KL².DA
√(KL².DA)
KL²/DA

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Mass Transfer
Dimension of mass diffusivity is the same as that of

Pressure
Kinematic viscosity
Dynamic viscosity
Surface tension

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Mass Transfer
Paper industry employs __________ driers.

Fluidised bed
Cylinder
Spray
Rotary

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Mass Transfer
Only small amount of evaporation of water produces large cooling effects because of its

Large latent heat
Small latent heat
Low viscosity
None of these

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Mass Transfer
The most common packing used in industrial operations is __________ rings.

Raschig
Single spiral
Lessing
Cross-partition

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