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Mechanical Engineering Exam Solutions, Exams of Engineering

Snow CollegeEngineering

A comprehensive set of solutions and explanations for a mechanical engineering final exam, covering a wide range of topics such as tension testing, compression testing, torsion testing, beam bending, buckling, impact testing, and stress concentration analysis. Detailed answers to various questions and problems related to these experimental techniques and their underlying principles. It seems to be a valuable resource for mechanical engineering students preparing for their final exams, as it offers in-depth insights and step-by-step solutions to the exam questions. The level of detail and the breadth of topics covered suggest that this document could be used as study notes, lecture notes, or a summary to help students understand and apply the key concepts in their coursework and exams.

Typology: Exams

2023/2024

Available from 09/12/2024

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ME 307 Final exam with compete
solutions.
ME 307 Final exam with compete
solutions.
What is the correct measurement for the caliper? - Answer = 3.6660
What is the uncertainty for a single measurement using the caliper shown? - Answer =
0.0005 in
A ruler is used to measure the diameter of a specimen. The measurement is recorded
as 0.52 +/- 0.01 inches. What is the uncertainty in the cross-sectional area? - Answer =
0.01 in^2
The following measurements are made with a ruler for the length, in cm, of a steel pin.
What is the proper value for the mean? - Answer = 4.40 cm
The following measurements are made with a ruler for the length, in cm, of a steel pin.
What is the uncertainty in the mean? - Answer = 0.01 cm
What is the limit for how many data sets should be plotted on a single graph? - Answer
= no more than 6
The caption for a table should be located: - Answer = above the table
Where is the best place for the legend of the plot comparing two functions? - Answer =
(C) in the corner ON the graph
When creating tables where the units are associated with a column heading label, the
units should be - Answer = below the label, centered, and in parenthesis
It is acceptable to split a table onto two different pages if there is not enough room -
Answer = False
All tables and figures should have a caption, be sequentially numbered, and be
referenced within the text of the report. - Answer = True
Which representation of numbers is not correct? - Answer = 16 ounces of sodium were
injected into the specimen.
Axis labels for the scatter plots should always include units - Answer = True
The caption for a table is placed directly below the table - Answer = False
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solutions.

ME 307 Final exam with compete

solutions.

What is the correct measurement for the caliper? - Answer = 3. What is the uncertainty for a single measurement using the caliper shown? - Answer = 0.0005 in A ruler is used to measure the diameter of a specimen. The measurement is recorded as 0.52 +/- 0.01 inches. What is the uncertainty in the cross-sectional area? - Answer = 0.01 in^ The following measurements are made with a ruler for the length, in cm, of a steel pin. What is the proper value for the mean? - Answer = 4.40 cm The following measurements are made with a ruler for the length, in cm, of a steel pin. What is the uncertainty in the mean? - Answer = 0.01 cm What is the limit for how many data sets should be plotted on a single graph? - Answer = no more than 6 The caption for a table should be located: - Answer = above the table Where is the best place for the legend of the plot comparing two functions? - Answer = (C) in the corner ON the graph When creating tables where the units are associated with a column heading label, the units should be - Answer = below the label, centered, and in parenthesis It is acceptable to split a table onto two different pages if there is not enough room - Answer = False All tables and figures should have a caption, be sequentially numbered, and be referenced within the text of the report. - Answer = True Which representation of numbers is not correct? - Answer = 16 ounces of sodium were injected into the specimen. Axis labels for the scatter plots should always include units - Answer = True The caption for a table is placed directly below the table - Answer = False

solutions.

Multiple tables or figures in a document should all be similar in style (font style, font size, etc.) - Answer = True What additional device is used on the steel specimen? - Answer = Extensometer What is the general shape of the test specimens? - Answer = Dog-bone How many manual clutch speed modes are available on the MTS TestWorks computer interface? - Answer = 2 (slow and fast) What machine is used during the tension experiment? - Answer = Sintech 10/GL (10 kip capacity) An engineering ruler is used to measure the geometry of each specimen. - Answer = False The test specimen should be passed tightly against the top/bottom of each jaw. - Answer = False Which three materials are being tested during the tension test? - Answer = - Clear Acrylic

  • Steel
  • Aluminum This quiz is an individual effort. I am completing this quiz without help from any other people. I will not share or redistribute the questions in any way. - Answer = True Extensometer output channel provides? - Answer = Strain For the steel specimen, the cross-head displacement data is more accurate than the extensometer data. - Answer = False For ductile steel necking started at the yield point - Answer = False For a ductile material, typically - Answer = Fracture strength < Ultimate strength From the tension test results which material has the highest ultimate tensile strength? - Answer = Steel

solutions.

Some materials show dramatically different behavior in compression than in tension. - Answer = True If A and B are all test data for a kind of ductile material, which curve is more likely from a compression test? - Answer = A If the cress 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 - Answer = Not possible on this machine During the compression of wood, if we find the cracks are parallel to the load direction, what kind of failure is this? - Answer = Splitting Which of the following are true for the Southwark Baldwin setup - Answer = - Design capacity is 60,000 lbs

  • Operating principle is hydraulics What materials are tested in the torsion ecperiment? - Answer = - Aluminum
  • Steel
  • Acrylic What shape are the test specimens in the torsion experiment? - Answer = - Dog bones Which of the following can rotate? - Answer = - Headstock Which of the following are free to move along the axis of the specimen? - Answer = - Tailstock Which of the following is true for the headstock and the tailstock? - Answer = They are 3 - jawed What are the raw parameters recorded by the software? - Answer = - Torque
  • Angle of rotation How many degrees of rotation does it take for a 12.7 mm diameter, 200mm long steel specimen to reach the yield point in a torsion test if the measured torque at yield is 30 N-m and the shear modulus is 79.3 GPa? - Answer = 1. If 'dogbone' shaped samples are used for torsion testing, where along the gauge length with the torsion specimen fail? - Answer = Max. shear stress is not a function of the length, therefore, is no way to predict where the sample will fail unless there is a noticeable defect on the surface.

solutions.

The shear modulus and elastic modulus have the same units. - Answer = True Why are flat spots milled into the ends of the torsion test samples? - Answer = To prevent the sample from slipping in the jaws due to high torque In a pure torsion test, an aluminum sample will reach its maximum shear stress limit before a cast iron sample. - Answer = True For this experiment, what material are the majority of the beams made from? - Answer = Aluminum What do the beams have in common? - Answer = cross-sectional area How much force is placed on each beam, in pounds? - Answer = 300 What assumption is made about the first specimen? - Answer = Infinite stiffness What variable is measured, that has not been measured yet this semester? - Answer = Load frame compliance How would the strain measurement change if you mounted the dummy gauge (on the box or solid sections) just to the side of the load point, on the top of the beam. It is oriented with the long axis of the beam. - Answer = The measured strain value would increase. Your work on this quiz is supposed to be - Answer = an individual effort. What could be a source of error that causes the theoretical result to differ from the experimental results? Select ALL that apply. - Answer = - The theoretical calculation is based on a 2-dimensional configuration, where force is applied on a point, but the experimental set-up is an extension in 3D, where the force is not applied on a line. On one hand, the surface may not be smooth for the force to be evenly distributed, on the other hand, the width of the head that is pushing the beam cannot be neglected.

  • When measuring the machine compliance, the steel block is not infinitely stiff. What is the maximum bending moment when applying force P at the center of the beam? The length of the beam is L as shown in the figure below: - Answer = 0.25PL In the beam bending experiment, the same load is applied to beam A,A and C as shown in the figure, and they are all made from aluminum 6061 and have a span length of 10 in, which beam has the largest deflection? - Answer = A

solutions.

In the cantilever beam experiment, what is used to measure deflection? - Answer = String The pendulum results are expected to change with what two variables? - Answer = - Carbon Content

  • Temperature The defining feature of the pendulum test specimens is ... - Answer = V-notch in a typical ASTM charpy impact test, which variable needs to be most tightly controlled by the experimenter? - Answer = Temperature The cantilever beam deflection results were too high for one group. Which of the following experimental errors would most likely be the cause? - Answer = Visually approximating drop heights What conclusions can be drawn from a 1020 steel specimen that doesn't break in two pieces? - Answer = Invalid test As the drop height increases, the small angle assumption and small deformation assumptions become - Answer = Less valid The Charpy impact test is a useful tool for (select all that apply) - Answer = - Verifying a steel alloy from a new supplier.
  • Determining embrittlement of a material due to radiation. Say it's a beautiful day for (snow) skiing, we don't know exactly what the temperature is, but we decide to do the Charpy Impact test outdoors. Which of the steels tested in lab would produce the least reliable results? - Answer = 1020 What materials are being tested during the stress concentration experiment? - Answer =
  • Aluminum What device used to measure strain in the stress concentration experiment? - Answer =
  • Strain gauge What's the name of the circuit used to measure strain values? - Answer = Wheatstone bridge What machine is used to apply a tensile force on one of the test specimens? - Answer = Sintech 10/GL (10 kip capacity)

solutions.

How much force (in pounds) are we applying with the apparatus in the previous question? - Answer = 2, In this experiment, you will use the strain values at 4 locations to determine the elastic modulus and Poisson's ratio from Hook's Law. What value of σ should be used? - Answer = 0 A 2 in wide rectangular plate with a 1" diameter centered hole is loaded axially. What is the approximate stress concentration factor? - Answer = 2. When reading the micro strain after the tensile load is applied to the aluminum bar in the stress concentration experiment, the strain output channel jumps around between 4 51 and 45 microstrain. Is this cause for concern? - Answer = No Why do we need the small brass pins in the hinged joints? Select one that is the most appropriate. - Answer = They are used to prevent the aluminum bar from shearing accidentally. In the stress concentration experiment, what is the purpose of a dummy gauge? Select ALL that apply. - Answer = - It is used as a part of the circuit to measure the resistance change.

  • it is used to compensate for the change of surrounding temperature. What is the name of the circuit used on the strain gauge? - Answer = Wheatstone bridge The strain gauge circuits are all balanced (they read 0 strain), the experiment is conducted, but then the strain gauge circuits don't return back to 0 after releasing the load. What are some options for the experimentalist? Select ALL that apply. - Answer =
  • No need to repeat the experiment because the deviation is relatively small.
  • Repeat the experiment if the reading of strain gauge after releasing the load is sufficiently far away from 0. Consider a part of the shape shown in the figure, and it is under tensile load as shown in the figure, which case will give a largest stress concentration factor, K? - Answer = r = 0.3 in, d = 0.8 in When calculating the stress concentration factor,K, from the experimental data, the thickness of the aluminum cancels out so does not influence the result of K. - Answer = False Stress concentration factors are independent of thickness. - Answer = True