What is the critical radius of insulation (cms) for a metallic cylinde – McqOptions

MCQOPTIONS

1.	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/m 2 . Â°K ? Thermal conductivity of metal and insulation material are 40 and 0.1 W/m.Â°K respectively.
A.	2
B.	5
C.	10
D.	20
Answer» B. 5

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