I realize these are alot of questions. But I would appreciate any number of them
ID: 2993897 • Letter: I
Question
I realize these are alot of questions. But I would appreciate any number of them being answered.
1. In the 1-D heat conduction equation, why is the differentiation sign in ordinary and not partial?
(A) for convenience (B) for simplicity
(C) In a 1-D system the temperature is a function of one spatial variable only.
2. Why is it important to select an origin and coordinate axis?
(A) To specify the location
(B) It is impossible to determine the unique solution for a partial differential equation
without specifying the origin and coordinate axis.
3. In a 1-D heat conduction problem, is qx constant through the wall or does it change with x?
(A) It is a constant (B) It varies with x
4. Will qx be constant or does it change with x for a 1-D transient conduction problem?
(A) qx is a constant (B) qx changes with x
5. Will qx be constant for a 2-D conduction problem?
(A) yes (B) no (C) maybe
6. How many boundary conditions are needed to solve a 1-D heat conduction equation?
(A) one (B) two (C) three
7. Is it possible that the temperature distribution in a cylindrical shell is linear?
(A) No, since the area A changes with r.
(B) It is possible if the thermal conductivity k also changes with r.
8. What is the expression for A for a cylinder or a sphere in a 1-D heat conduction problem?
(A) a constant (B) 2?rL; 4?r2, respectively
9. Is qr constant or does it vary with the radius r in a cylindrical or spherical shell?
(A) It is a constant (B) It changes with radius r
10. Does heat flux qr
Explanation / Answer
1.C
2.B
3.A
4.A
5.A
6.A
7.A
8.B
9.A
10.A
1.A
12.A
13.B
14.A
15.A
16.A
17.B
18.C
19.B
20.A
21.D
22.B
23.A
24.A
25.B
26.B
27.B
28.A