Fouling factor for a heat exchanger is given by (where, U1 = heat tran – McqOptions

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1.	Fouling factor for a heat exchanger is given by (where, U1 = heat transfer co-efficient of dirty surface U2 = heat transfer co-efficient of clean surface).
A.	U1 - U2
B.	1/U1 - 1/U2
C.	1/U2 - 1/U1
D.	U2 - U1
Answer» C. 1/U2 - 1/U1

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