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Mass Transfer

Mass Transfer
Prandtl number for water at 20°C is about

0.7
7
150
70

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

Pressure
Surface tension
Kinematic viscosity
Dynamic viscosity

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Mass Transfer
Can a cooling tower cool water below the wet bulb temperature of inlet air?

Yes ; but the air flow rate should be excessively high
Yes ; but height of cooling tower will be prohibitively high
Yes
No

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Mass Transfer
Berl saddle made of carbon cannot be used for

Alkalis
H₂SO₄
SO₂
Oxidising atmosphere

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Mass Transfer
Psychrometry deals with the properties of gas-vapor mixture. Humidity can be determined by the measurement of the __________ of a fibre.

None of the listed here
Electrical resistance
Strength
Thermal conductivity

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Mass Transfer
1 kg of a saturated aqueous solution of a highly soluble component A at 60°C is cooled to 25°C. The solubility limits of A are (0.6 kgA/kg water) at 60°C and (0.2 kgA/kg water) at 25°C. The amount in kg of the crystals formed is

0.25
0.4
0.2
0.175

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