A rod of 10 mm diameter and 80 mm length with thermal conductivity 16W – McqOptions

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1.	A rod of 10 mm diameter and 80 mm length with thermal conductivity 16W/ m K protrudes from a surface at 160 degree Celsius. The rod is exposed to air at 30 degree Celsius with a convective coefficient of 25W/square m K. How does the heat flow from this rod get affected if the same material volume is used for two fins of the same length? Assume short fin with insulated end
A.	12.25 %
B.	25.6 %
C.	23.4 %
D.	21.2 %
Answer» E.

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