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

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Q. 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

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✅ Correct Answer: (A) U1 = U2

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