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BAEN 320 Exam 2
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Gravity
Key Concepts:
Terms in this set (22)
entropy change in an internally reversible isothermal process is ___________ proportional to the temp. of the system
inversely
s=Q/T
T or F: The isentropic process of an incompressible substance is also an isothermal process.
True
T o F: The Clausius inequality is valid for all thermodynamic cycles.
True
On a T-s diagram, the area under the process curve represents _______ ________ for internally reversible processes.
heat transfer
T or F: The Gibbs eqn implies that the only type of work a simple compressible system may have as it undergoes an internally reversible process is the boundary work.
True
The performance of a engineering systems is _________ by the presence of irreversibilities.
degraded
Entropy generation can be used as a quantitative measure of _______.
irreversibilities
Entropy generation Sgen is always ________.
a positive quantity or zero
What are these equations?
Tds=du+PdV
Tds=dh-vdP
Applicable for open or closed systems ?
Gibbs equations
applicable for both open and closed
By integrating Gibbs equations between the initial and final states of a system, what can be determined?
entropy change
Entropy
measure of molecular disorder
When the specific heats are
independent
of temperature, the constant-specific-heat assumption produces..
exact answers
For ______ ideal gases, the constant-specific-heat assumption introduces no error.
monatomic
Is entropy an extensive or intensive property?
extensive
If a system undergoes an isentropic process, entropy...
does not change
A system undergoing a reversible adiabatic process is necessarily ______.
isentropic
According to the Clausius inequality, for irreversible cycles, the value for the cyclic integral S{Q/T} is always...
less than zero
< 0
isentropic process
the entropy of a fixed mass does not change during a process that is
adiabatic
and internally
reversible
.
Sgen for :
Reversible process
Irreversible process
impossible process
Sgen for :
Reversible process = 0
Irreversible process > 0
impossible process < 0
Isentropic efficiency of a turbine
the ratio of actual work to the isentropic work
Once the state of the system is fixed, the value of entropy per unit mass s is ...
fixed
Mechanisms to transfer entropy
heat transfer
mass flow
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