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Mass Transfer

Mass Transfer
The rough value of diffusion co-efficient of water vapor into air at 25°C may be about __________ cm²/sec.

0.25
0.0025
2.5
1.25

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Mass Transfer
The velocity, concentration and temperature boundary, for the boundary layer development on a flat plate during connective mass transfer will be same, if

NSc = NPr = NLe
NPr = NLe
NSc = NLe
NSc = 1

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Mass Transfer
Sand is dried in foundaries in a___drier.

Vacuum
Fluidisedbed
Spray
Rotary

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Mass Transfer
The percentage humidity is less than the relative humidity only at __________ percent humidity.

Both zero and hundred
Zero
Hundred
None of these

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Mass Transfer
Out of the following gas-liquid contacting devices, for a given set of operating conditions, gas pressure drop is the least in __________ tower.

Perforated tray
Packed
Bubble cap
Wetted wall

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Mass Transfer
Swenson-Walker crystalliser is a __________ unit

Batch
Semi-batch
Continuous
Cooling (adiabatic)-cum-evaporation

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