What is the critical radius of insulation (cms) for a metallic cylinder, if the

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Question

What is the critical radius of insulation (cms) for a metallic cylinder, if the convective heat transfer co-efficient with the ambient atmosphere is 5 W/m². °K ? Thermal conductivity of metal and insulation material are 40 and 0.1 W/m.°K respectively.

Options:

A . 2

B . 5

C . 10

D . 20

Answer: Option A

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