Solved: A 10-cm high and 20-cm wide circuit board houses

Chapter 2, Problem 2135

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A 10-cm high and 20-cm wide circuit board houses on its surface 100 closely spaced chips, each generating heat at a rate of 0.08 W and transferring it by convection to the surrounding air at 258C. Heat transfer from the back surface of the board is negligible. If the convection heat transfer coefficient on the surface of the board is 10 W/m2 8C and radiation heat transfer is negligible, the average surface temperature of the chips is (a) 268C (b) 458C (c) 158C (d) 808C (e) 658C

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