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Mass Transfer

Mass Transfer
For turbulent mass transfer in pipes, the Sherwood number depends on the Reynolds number as

Re
Re0.83
Re0.53
Re0.33

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

Single spiral
Lessing
Raschig
Cross-partition

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Mass Transfer
Make up water is supplied during cooling tower operation to compensate for water losses due to

Evaporation
All of these
Blowdown
Entrainment

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Mass Transfer
Dried finished product sampled from various parts of a __________ dryer exhibits non-uniformity in the moisture content.

None of these
Rotary
Freeze
Tray

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Mass Transfer
An air-water vapour mixture has a dry bulb temperature of 60°C and a dew point temperature of 40°C. The total pressure is 101.3 kPa and the vapour pressure of water at 40°C and 60°C are 7.30 kPa and 19.91 kPa respectively.The humidity of air sample expressed as kg of water vapour/kg of dry air is

0.048
0.122
0.152
0.079

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

Low viscosity
Small latent heat
Large latent heat
None of these

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