1. Consider the temperature in a composite wall consisting of materials A,B,C which is shown below. Three materials' sizes are exactly equal. Top and bottom side of the wall is well insulated. We assume that thermophysical properties are all constant. Which two of the following are true A) Thermal resistance is largest in material A B) Theral resistance is largest in material B C) Heat is being generated within the wall D) Sign of heat rate is positive E) sign of heat rate is negative
1. Consider the temperature in a composite wall consisting of materials A,B,C which is shown below. Three materials' sizes are exactly equal. Top and bottom side of the wall is well insulated. We assume that thermophysical properties are all constant. Which two of the following are true
A) Thermal resistance is largest in material A
B) Theral resistance is largest in material B
C) Heat is being generated within the wall
D) Sign of heat rate is positive
E) sign of heat rate is negative
2. Which two of the following are best correct statements for the wall with the temperature distribution shown below:
A) The heat flux would be constant at any location in the wall
B) It is unclear if heat is being generated within the wall
C) Heat does not flow across the centerline
D) Everywhere inside the wall, heat flows only to the right( same direction as the x-direction
E) If the convection outside the wall is occuring with a normal magnitude of h, then it can be expected that Ts >> Tinfinity
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