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