Quiz 05_11102023
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University of Texas, Arlington *
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Course
3310
Subject
Aerospace Engineering
Date
Jan 9, 2024
Type
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6
Uploaded by ChancellorOpossumPerson378
Thermodynamics I
MAE 3310-002
Quiz 05 (28 points)
11/10/2023
LAST NAME_FIRST NAME
Sunand Santhanagopalan
Multi-Scale Energy Systems (MuSES) Laboratory
Mechanical & Aerospace Engineering
University of Texas at Arlington
MAE 3310-002
2
Question I
1.
For an ideal gas, internal energy is only a function of temperature. True or False
2.
Values of internal energy and enthalpy for ideal gases can be found using table A-
17 to A-25. True or False
3.
Values of internal energy and enthalpy for ideal gases can be found using data in
table A-A-2. True or False
4.
Relation between C
p
and C
v
is
_____________
5.
For solids and liquids internal energy is only a function of temperature, but is this
necessarily true for enthalpy?
3
Question II
1.
For a control volume with multiple inlets and outlets, calculating
mass balance would require the consideration of all inlets and
outlets. True or False
2.
For steady flow of an incompressible fluid (density constant) the
volume flow rate across the inlet and outlet will be the same. True
or False
3.
For steady flow of an incompressible fluid (density constant) the
cross-sectional area of the fluid increases as the velocity increases.
True or False.
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4
Question II
4.
Consider a device with one inlet and one outlet. If the volume flow
rates at the inlet and at the outlet are the same, is the flow through
this device necessarily steady? Why?
5.
For steady flow systems change in energy or mass within the
control volume over time can be non-zero. True or False
6.
The purpose of a nozzle is to increase velocity of flowing fluid. True
or False
7.
The purpose of a diffuser is to increase velocity of flowing fluid.
True or False
8.
For a nozzle and diffuser, the energy balance shows the enthalpy +
kinetic energy are equal at inlet and outlet. True or False
5
Question II
9.
In flow through a nozzle, the velocity goes up, thus the area also ges
up. True or False.
10.
In flow through a nozzle, the velocity goes up, thus the enthalpy
also goes up. True or False.
11.
In flow through a nozzle, the velocity goes up, thus fluid leave faster
resulting in pressure going down accompanied with fluid
expansion. True or False.
12.
In flow through a diffuser, the velocity goes down, thus fluid
collecting at exit results in pressure going up accompanied with
fluid compression. True or False.
6
Question III
1
st
law of Thermodynamic equation for an open system control volume - units of energy/time
W
in
–
W
out
+
Q
in
–
Q
out
+
m
(ke +pe +
h
)
in
-
m
(ke +pe +
h
)
out
=
U
sys
/ dt
●
●
●
●
●
●
Where
m
is the mass flow rate of the substance entering/exiting the control volume
1.
If the system is operating at a steady state, what term in the above equation must be equal to
zero?
2.
What term in the LHS of the above equation contains the
P
v
work
done on
the system from
fluid mass entering the control volume
?
3.
What term in the LHS of the above equation contains the
P
v
work
done by
the system from
fluid mass exiting the control volume
.
4.
Given a mixing chamber with mass flows m
a
and m
b
going into the chamber and mass flow m
c
exiting the chamber, write the
conservation of mass equation as applied to this device.
5.
Match the version of the 1st law equation from the list below with the applicable adiabatic
open-system device: (1 point each)
i)
Mixing Chamber
ii)
Nozzle
iii) Diffuser
iv) Heat Exchanger
v)
Turbine
vi) Throttling Valve
vii) Compressor
a)
m (h
2
-h
1
) =
-W
out
b)
m
a
h
a
+ m
b
h
b
= (m
a
+m
b
) h
c
c)
m (h
2
-h
1
) =
W
in
d)
h
1
+ ke
1
= h
2
+ ke
2
e)
m
a
(h
a2
-h
a1
) =
-
m
b
(h
b2
-h
b1
)
f)
h
1
= h
2
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