Quiz_ Quiz 2
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School
California Polytechnic State University, Pomona *
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Course
4011
Subject
Aerospace Engineering
Date
Dec 6, 2023
Type
Pages
6
Uploaded by MarketFood
Quiz 2
Started: Mar 22 at 1pm
Quiz Instructions
Quiz 2 is 15 minutes long, closed book, notes, and homework. There are 20 concept type of questions.
Please select True or False for each question.
1 pts
Question 1
True
False
Forced convection is caused by buoyancy forces that are induced by density
differences.
1 pts
Question 2
True
False
The thermal diffusivity of a material can be viewed as the ratio of heat conduction to
heat storage.
1 pts
Question 3
True
Thermal resistance is defined as the ratio of the driving temperature difference over
the heat transfer rate.
False
1 pts
Question 4
True
False
To decrease the heat transfer rate from a cylindrical pipe, the outer radius of the
insulation must be less than the critical radius
1 pts
Question 5
True
False
The isentropic efficiency of a turbine is the ratio of the isentropic turbine work output
to the actual turbine work output.
1 pts
Question 6
True
False
A composite wall consists of two parallel layers with thermal resistances
R
and
R
The total thermal resistance of the composite wall is
R
=
R
+
R
.
1
2.
tot
1
2
1 pts
Question 7
True
False
The fin effectiveness is the ratio of the actual heat transfer rate from the fin to the
maximum heat transfer rate from the fin.
1 pts
Question 8
True
False
Entropy is a nonconserved property
1 pts
Question 9
True
False
The rate of convection heat transfer is expressed by Newton's law of cooling
1 pts
Question 10
True
False
The Clausius statement of the second law of thermodynamics is related to heat
engines
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1 pts
Question 11
True
False
It is of great benefit to design fin to be “extra long” to increase the surface area and
rate of heat transfer.
1 pts
Question 12
True
False
Fourier’s law says that
q
=
kA
d
T
/d
x
.
1 pts
Question 13
True
False
Radiation requires an intervening medium.
1 pts
Question 14
True
The emissivity of a blackbody is greater than one
False
1 pts
Question 15
True
False
In the gap between two large parallel plates filled with still air, there are two modes of
heat transfer: conduction and radiation.
1 pts
Question 16
True
False
Entropy generation is a measure of irreversibility during a process.
1 pts
Question 17
True
False
Kirchhoff’s law says that the emissivity and absorptivity of a surface at a given
temperature and wavelength are equal.
1 pts
Question 18
No new data to save. Last checked at 1:21pm
True
False
Gibbs equation is the second
Tds
relation written as
Tds
=
dh
-
vdP
1 pts
Question 19
True
False
A blackbody is a perfect emitter and a perfect absorber.
1 pts
Question 20
True
False
The Carnot cycle is the most efficient cycle operating between two specified
temperature limits
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