2021 BE 1251 Exam 1 Written_Version 1 - Key (1)
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Louisiana State University *
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1251
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Mechanical Engineering
Date
Dec 6, 2023
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2021 BE 1251 Exam 1 Version 1 Key
Name ______________________
Type in your name above, and your short answers in the spaces provided below.
When finished, save as a
PDF (.pdf) and upload to Moodle in the 10/25 to 10/29 section. 5 points each for 35 total points.
1)
What is engineering? Please define engineering stating the three main points or focuses of
engineers.
a.
Engineering
is the discipline, art, skill and profession of acquiring and applying
scientific
,
mathematical
,
economic
, social
, and practical knowledge, in order to
design
and build structures, machines, devices, systems, materials and
processes
that safely
realize improvements to the lives of people.
2)
What are any two of the five cornerstones of personal ethical behavior?
a.
Do what you say you will do
b.
Never divulge information given to you in confidence
c.
Accept responsibility for your mistakes
d.
Never become involved in a lie
e.
Never accept gifts that compromise your ability to perform in the best interests of your
organization
3)
A House of Quality is used to relate the importance of engineering characteristics of a design to
the:
a.
Supervisor Ideas
b.
Quantitative Attributes
c.
Gantt Chart
d.
Customer Attributes
4)
Which phase of the Engineering Design Method would include looking up information through
patents, the internet, or trade journals?
a.
Phase 1 – Conceptual Design - Gathering Information
5)
__Flexibility__
________ in use accommodates a wide range of individual preferences and
abilities as one of the Seven Principles of University Design
Excel Practical Problem:
6-7) Download the file “2021ExamSensorDataset.xlsx” from Moodle, which includes voltage data from
two sensors detecting an analyte’s concentration. For the first 7 seconds of each trial, there was no analyte
introduced; what are the average and standard deviations of sensor voltage over the time were analyte was
detected?
Sensor
A
B
Average Voltage (mV)
Standard Deviation (mV)
Next, create a plot showing the relationship between all time points of sensor output and analyte
concentration, being sure to label your chart and axes.
Include the multiple data points for zero analyte
concentration in your plot.
Add trendlines for both sensor A and B, and show the equations and R-
squared values with appropriate significant figures so that they are clearly visible.
Paste the chart below
in this Word document.
Which sensor has a response that is more linear with concentration?
How did you determine this?
More linear sensor: __B____
This can be concluded by:__R
2
of Sensor B is 0.989547 which is greater than Sensor A of 0.933512
making the data more linear
For Sensor A, what will the voltage be at 30 ppm concentration?
188.323453 mV
(Paste your chart below.)
0
5
10
15
20
25
0.000000
20.000000
40.000000
60.000000
80.000000
100.000000
120.000000
140.000000
160.000000
180.000000
f(x) = 3.21 x + 50.59
R² = 0.99
f(x) = 5.54 x + 21.96
R² = 0.93
Sensor A (mV)
Linear (Sensor A (mV))
Sensor B (mV)
Linear (Sensor B (mV))
Concentration (ppm)
Voltage (mV)
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