NAME___
SOLUTIONS
_______
INSTRUCTOR
:(circle one)
Kalnitsky 8am
Levy 9am
Smith 10am
Oztekin 10am
Macpherson 11am
LEHIGH UNIVERSITY
DEPARTMENT OF MECHANICAL ENGINEERING AND MECHANICS
ME 104 — THERMODYNAMICS I
Final Exam (Closed Books and Notes)
SPRING
2009
______________________________________________________________________________
INSTRUCTIONS:
1. No unauthorized books, notes, or other similar materials are permitted.
2. Use thermodynamic tables provided as necessary.
3. Information stored in the memory of a calculator can not be used in the exam
and receives no credit.
4. Show all your assumptions clearly.
5.
Show ALL the steps in the solution of problems, both analytical and
numerical,
ON PAPER
to receive credit.
6. LEGIBILITY is essential or the
exam can not be graded properly
.
______________________________________________________________________________
Problem No.
Points
Grade
1
25
2
25
3
25
4
25
5
25
6
25
Total
150
The below set of thermodynamic equations may be useful.
C
P
=
R
+
C
v
C
P
/ C
v
=
k
T dS
=
dU
+
P dV
T dS
=
dH

V dP
Δ
s
=
∫
C
v
dT / T
+
R ln ( v
2
/ v
1
)
Δ
s
=
C
v,ave
ln ( T
2
/ T
1
)
+
R ln ( v
2
/ v
1
)
Δ
s
=
∫
C
P
dT / T

R ln ( P
2
/ P
1
)
Δ
s
=
C
P,ave
ln ( T
2
/ T
1
)

R ln ( P
2
/ P
1
)
Δ
s
=
s
2
0

s
1
0

R ln ( P
2
/ P
1
)
P
2
/ P
1
=
P
r2
/ P
r1
v
2
/ v
1
=
v
r2
/ v
r1
P
2
/ P
1
=
( v
1
/ v
2
)
k
T
2
/ T
1
=
( P
2
/ P
1
)
(k – 1)/k
T
2
/ T
1
=
( v
1
/ v
2
)
k – 1
η
C
=
w
s
/ w
a
η
T
=
w
a
/ w
s
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document