Heat Transfer
A metal wire of 0.01 m dia and thermal conductivity 200 W/m.K is exposed to a fluid stream with a convective heat transfer coefficient of 100 W/m².K. The Biot number is

0.025
3.5
0.0035
5.6

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Heat Transfer
In a shell and tube heat exchanger,

The relationship is not generalised
The temperature drops in the two fluids and the wall are proportional to individual resistances
The temperature drop is inversely proportional to the resistance across which the drop occurs
There is no relationship between temperature drop and resistance

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