ME 410 - Spring 2011
Testl
Problem 1 - A 15 cm X 20 cm circuit board
houses 120 closely spaced 0.12 W logic
chips. Determine
1. the amount of heat dissipated in 10 h
in kWh.
2. the heat ﬂux on the sur
ff
ME410 FALL 2010 - TEST 3
USEFUL EQUATIONS ARE GIVEN BELOW THE
LAST PROBLEM.
Problem 1 - Water is boiled at 100°C
electrically by an 80-cm-long, 2-mm-
diameter horizontal resistance wire made of
che
Test 3 ME 410, Fall 2011
Closed book and closed notes
Problem 1
Consider a 10-m long smooth rectangular tube, with a = 50 mm and b = 25 mm, that is
maintained at a constant surface temperature. Liquid
Test 1 ME 410, Fall 2011
Closed book and closed notes
Problem 1
Consider a sealed 20-cm-high electronic box whose base dimensions are 50 cm x 50 cm
placed in a vacuum chamber. The emissivity of the ou