Heat Transfer
The driving potential for the crystal growth during crystallisation is the __________ of the solution.

Super-saturation
Density
Concentration
Viscosity

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Heat Transfer
Condensing film co-efficient for steam on horizontal tubes ranges from 5000 to 15000 Kcal/hr.m² .°C. Condensation of vapor is carried out inside the tube in a shell and tube heat exchanger, when the

Higher condensing film co-efficient is desired
Condensate is corrosive in nature
Lower pressure drop through the exchanger is desired
Temperature of the incoming vapor is very high

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Heat Transfer
Fouling factor

Accounts for additional resistances to heat flow
Is a dimensionless quantity
None of these
Does not provide a safety factor for design

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