307 FINAL EXAM (ALL PRE-POST LAB) QUESTIONS AND ANSWERS
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Course
307
Institution
University Of The People
307 FINAL EXAM (ALL PRE-POST LAB) QUESTIONS AND ANSWERS
The following plot is from an experiment that measured the force required to break the lead in a
mechanical pencil, when being held at 60 degrees from the flat surface. What's wrong with this plot?
Missing a legend
Dots shouldn't be conn...
307 FINAL EXAM (ALL PRE-POST LAB) QUESTIONS AND ANSWERS 2024-2025
The following plot is from an experiment that measured the force required to break the lead in a
mechanical pencil, when being held at 60 degrees from the flat surface. What's wrong with this plot?
Missing a legend
Dots shouldn't be connected
Nothing is wrong
Missing a title - ANS-✔✔Dots shouldn't be connected
One could make this data set linear by changing the x-axis limits to display only the linear region, where
x is between 3.5 inches and 4 inches for example. Inserting a trend line would then give the slope of the
linear region. - ANS-✔✔False
What's the best method for demonstrating your use of the correct analysis method?
Include as many equations as you can. Use the integral symbol (∫) or advanced logical operators
(∩,∑,×,Π) if you aren't sure of your technique.
Sample calculations
Email the TA ahead of grading
Provide all of the experimental data - ANS-✔✔Sample calculations
What is wrong with the following plot?
Nothing is wrong
Plot is missing a title
Theory should be a solid line
Experimental data should be a solid line
, Orange data points missing from first two data points - ANS-✔✔Theory should be a solid line
The fracture surface of the acrylic specimen is _______ to the direction of the loading. - ANS-✔✔
Normal
For ductile steel necking started at the yield point - ANS-✔✔False
If the main purpose of a tension test is just to find the elastic modulus and Poisson's ratio then one can
perform the test with a constant cross section cylindrical specimen instead of the varying-diameter dog-
bone shaped specimen. - ANS-✔✔False
For a highly brittle material with a fracture strength of 50 MPa and % of ductility of 5, what is the
materials toughness? - ANS-✔✔1.25 MPa
For a ductile material, typically - ANS-✔✔Fracture strength < Ultimate strength
If there is a small flaw in our acrylic test specimen (notch, crack, chip, scratch), oriented along the
loading axis, how will this affect the results of the compression test? - ANS-✔✔Failure will occur sooner
If the cross section of the longer wood specimen is two (2) inches by four (4) inches the load at failure
during your test on the Sintech 10/GL would be - ANS-✔✔Not applicable
In the stress concentration experiment, what is the purpose of a dummy gauge? Select ALL that apply.
It is not necessary if the surrounding temperature is accurately controlled to be the same for each
experiment.
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