ME113 Spring 2008 Exam #1
Key to Examination #1 ME113 THERMODYNAMICS
Spring 2008 Section 02
1
ME113 Spring 2008 Exam #1
1. For a system to be in thermodynamic equilibrium, do the temperature and the pressure of the system have to be the same ev
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GATEWAY QUIZ 3
ME 113 FALL 2016
1. cfw_5 points) If water is heated at constant pressure, how does the entropy change?
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Ea. It increases.
b. It decreases. /
c. It stays the same. ,5
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2. (5 points) Can a hea
CHAPTER 9 SUMMARY
A cycle during which a net amount of work is produced is called a power cycle, and a power cycle during which the
working fluid remains a gas throughout is called a gas power cycle. The most efficient cycle operating between a
heat sourc
Greg White
ME113
Gosselin
Hydropower: The cleaner energy
We need to refine the ways of creating energy to reduce pollution and slow
the effects of climate change. There are several options readily available to become a
cleaner world through renewable ener
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Round your answer to five decimal places.
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100 psia and 100F to a pressure of
10 psia. Determine the entropy generation for this process, in
Btu/lbmR.
R-134a
100 psia
100F
s gen =
Btu/lbmR
10
psia
A 1.98m 3 rigid tank initially contains air whose density is 1.86 kg/m 3. The tank is
connected to a high-pressure supply line through a valve. The valve is opened, and air is
allowed to enter the tank until the density in the tank rises to 8.58 kg/m 3. D
Two rigid tanks are connected by a valve. The left tank, with a volume of 1.5 m 3, contains
air at 192C and 445 kPa while the right tank contains 6.0 kg of air at 299C and 217
kPa. Now the valve is opened and air is allowed to mix until the system reaches
Second Law of Thermodynamics
ME 113
San Jose State University
Prof. Gosselin
Mechanical Engineering Department
ME 113
Are these things possible?
A hot coffee cup in a cool room removes heat
from its surroundings and gets hotter.
The air from a popped ba
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1a. R4343 enters an adiabatic compressor as a saturated vapor with a pressure of 120
kPa. The volumetric ﬂow rate entering the compressor is 0.3 ins/min. The compressor
isentropic efficiency is 80%. The exit pressure is 1 MPa. Find the temperature of the
Semen 1 — Short :enceet queatrene
of steam- The initial temperature and pressure are IIIII'E
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From Tau Beta Pi SJSU Exam Library: http:/exams.tbpsjsu.org
From Tau Beta Pi SJSU Exam Library: http:/exams.tbpsjsu.org
From Tau Beta Pi SJSU Exam Library: http:/exams.tbpsjsu.org
From Tau Beta Pi SJSU Exam Library: http:/exams.tbpsjsu.org
From Tau Beta P
ME 113 Exam 2 Section 1
Fall 2010
Name
instructions:
I. Show all Work clearly! Put equations in symboiic form before adding numbers. List assumptions. YOU
WILL NOT RECEIVE FULL CREDET IF YOU DO NOT SHOW ALL WORK, EVEN IF YOUR ANSWER
ANS PROCESS IS CORRECT
Instructions:
Work through as many of these problems as you can during the class period. You may work alone or in groups
of two or three. Start with the cycle about which you feel the least conﬁdent.
Diesel Cycle
An air—standard diesel cycle has a compres
Entropy
ME 113
Clausius Inequality
Were going to show that the Clausius Inequality
follows from the 2nd Law
Q
0
T
The little circle indicates that were integrating
around a cycle.
Reversible Cycles
Q QH QL
T TH TL
=QH
QH TH
but for a Carnot heat engine
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A mixture consisting of 0.18 kmol of methane (CH4) and 0.274 kmol of butane (241410) occupies a
vokume of 0.241 m3 at a temperature of 238°C. The experimental value for the pressure is
68.9 bar. Caiculate the pressure, in bar, exerted by the mixture using
ME 113 In-Class 1st Law Assignment
Due at the end of class
This assignment should be done in groups of two or no more than three. Only one paper needs to be turned in per
team.
Write down the two steady forms of the 1st law that we used in class for close
WIRE [iva the three farms 9:“ the 3‘" iaw that we usad in class-u far chased systems: steady state comm} volmnes,
_ “Maggi gggfgggl figs?! unsteadyrprgceases. igdilcata which gqggagisn is far; which form.
‘12.
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For me remainé Bastions, do
Air at 1 atm, 15C and 60% relative humidity is first heated to 20C in a heating section and then
humidified by introducing water vapor. The air leaves the humidifying section at 25C and 65% relative
humidity. Determine a) the amount of steam added to the
3
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temperature of 400F 7KHSLVWRQF\OLQGHUGHYLFHLVQRZFRROHGXQWLOLWVWHPSHUDWXUHLV
90F . Determine the final pressure of the water and the volume.
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SECOND LAW AND ENTROPY
2ND LAW OF THERMODYNAMICS
ARE THESE THINGS POSSIBLE?
NOPE.
A hot coffee cup in a cool room removes heat from its surroundings and gets hotter.
The air from a popped balloon stays inside the balloon, despite the hole.
A car crash rev
Phase Change Process of Pure Substances
Phase Change Process of Pure Substances
Quality
x?
mvapor mtotal
Not valid for compressed liquid or superheated vapor 0<x<1
Phase Change Process of Pure Substances
Phase Change Process of Pure Substances