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MIDDLE EAST TECHNICAL UNIVERSITY
DEPARTMENT OF CHEMICAL ENGINEERING
Ch.E. 204 Thermodynamics I (Section 04)
Dr. N. Sezgi, Ö. Mercan
PROBLEM SET I
(Date Due: March 11, 2011)
Problem 1.
A new absolute temperature scale is proposed. On this scale the ice point
of water is 150
0
S and the steam point is 300
0
S. Determine the temperatures in
0
C that
correspond to 100
0
S and 400
0
S, respectively. What is the ratio of the size of the
0
S to
the Kelvin?
Problem 2.
Why does a bicyclist pick up speed on a downhill road even when he is
not pedaling? Does this violate the conservation of energy principle?
Problem 3.
An apple “weighs” 80 g and has a volume of 100 cm
3
in a refrigerator at 8
0
C. What is the apple density? List three intensive and two extensive properties of the
apple.
Problem 4.
Over a limited temperature range, the relation between electrical
resistance R and temperature T for a resistance temperature detector is R=R
0
[1+
α
(T
T
o
)] where R
0
is the resistance, in ohms, measured at reference temperature
T
o
(in
0
F)
and
α
is a material constant with units of (
0
F)
1
. The following data are obtained for a
particular resistance thermometer:
T (
0
F)
R (
Ω
)
Test 1
32
51.39
Test 2
196
51.72
What temperature would correspond to a resistance of 51.47
Ω
on this thermometer?
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This note was uploaded on 03/05/2012 for the course CHE 222 taught by Professor Tülayözbelge during the Spring '12 term at Middle East Technical University.
 Spring '12
 TülayÖzbelge
 Chemical Engineering

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