# The rate of heat transfer through a pipe wall is given by, q = 2π k (Ti – T0)/ln (ri/r0). For cylinder of very thin wall, q can be approximated by _____ ? with Answer - Chemical Engineering Mcqs | TestPrep

> Solved MCQ: The rate of heat transfer through a pipe wall is given by, q = 2π k (Ti – T0)/ln (ri/r0). For cylinder of very thin wall, q can be approximated by _____ ? Correct Answer: D. q = 2π k (Ti – T0)/[(r0 + ri)/2]. Verified answer explanation for FPSC, PPSC, MDCAT, NTS, and CSS competitive exam preparation.

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# The rate of heat transfer through a pipe wall is given by, q = 2π k (Ti – T0)/ln (ri/r0). For cylinder of very thin wall, q can be approximated by _____ ?

Direct Answer & Quick Reference

The correct option is **D. q = 2π k (Ti – T0)/[(r0 + ri)/2]**.

A. q = [2π k (Ti + T0)/2]/ln (ri/r0)

B. q = 2π ri k (Ti – T0)/(r0/ri)

C. q = 2π k (Ti – T0)/(r0/ri)

D. q = 2π k (Ti – T0)/[(r0 + ri)/2] **(Correct Answer)**

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Verified Key: D. q = 2π k (Ti – T0)/[(r0 + ri)/2]
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