Overall heat transfer co-efficient of a particular tube is U1. If the – McqOptions

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1.	Overall heat transfer co-efficient of a particular tube is U1. If the same tube with some dirt deposited on either side has coefficient U2, then
A.	U1 = U2
B.	U2 > U1
C.	U1 > U2
D.	U1 = dirt factor - U2
Answer» B. U2 > U1

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