a) Biological Fouling
b) Chemical Fouling
c) Corrosion Fouling
d) Freezing Fouling
Answer: a
Explanation: Biological Fouling is due to the microorganisms present on heat transfer surfaces. It is a common fouling mechanism seen when untreated water is used as the coolant. A variety range from algae to other microbes can be seen. These microbes are grow into colonies within hours, restricting heat transfer.
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