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

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Dec 6, 2023

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docx

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2

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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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