MOM Final Exam Review

MOM Final Exam Review

by Katie Heckman

Multiple Choice

The relationship between longitudinal and lateral strain that is associated with an applied axial load is defined by:

• Hooke's Law

• Poisson's ratio

• Euler's Buckling Load

• Saint Venant's Principle

​What is Hooke's Law?

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​What is Poisson's Ratio?

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​What is Euler's Buckling Load?

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​What is St. Venant's Principle?

Multiple Choice

The elastic region of a stress-strain diagram for steel has the following characteristics:

• The stress and strain are linearly related

• Defines the modulus of elasticity for a material

• When loaded and unloaded in this region, specimen will return to its original shape

• All of the above

Multiple Choice

• 74.7 MPa

• 74.7 GPa

• 88.3 MPa

• 7.85 MPa

• 53.3 MPa

Multiple Choice

Determine the location of the centroid (y) from the given x' axis

• 6 in

• 7.18 in

• 7.45 in

• 8.10 in

Multiple Choice

At failure, the fracture stress of a specimen was 925 MPa. The original cross sectional area was 126.7 mm² and the final cross section diameter was measured at 8.89 mm. What is the true engineering stress at fracture?

• 150 MPa

• 925 N

• 453 MPa

• 1890 MPa

• 2250 MPa

Multiple Choice

For the applied loads and dimensions, calculate T_AB.

• 12.5 lb-in

• 12.5 lb-ft

• 25 lb-in

• 25 lb-ft

Fill in the Blanks

Multiple Choice

A No. 2 pencil is subject to Torque as shown. The appropriate geometry of deformation is:

• $$\phi_{1\ }+\ \phi_{2\ }=\ 0$$  

• $$\phi_{1\ }=\ \phi_{2\ }=\ 0$$  

• $$\phi_{1\ }-\ \phi_{2\ }=T$$  

• $$\phi_{1\ }=\ \phi_{2\ }$$  

Multiple Choice

Where is the maximum shear stress found due to a transverse load on the constant cross section of a beam

• At the neutral axis

• At the outer fibers

• All of the above

• None of the above

Multiple Choice

The principal stresses at a point are shown on a stress element and the associated Mohr’s Circle. Determine the maximum in plane shear stress.

• 7 ksi

• 18 ksi

• 25 ksi

• 50 ksi

Multiple Choice

The principal stresses at a point are shown on a stress element and the associated Mohr’s Circle. Determine the absolute max shear stress.

• 7 ksi

• 18 ksi

• 25 ksi

• 50 ksi

Multiple Choice

On Mohr's circle for a stress element, the average normal stress is found at the same rotation as:

• the principal normal stresses

• the max shear stress

• $$\sigma_x\ and\ \sigma_y\$$  

• hoop and tangential stresses

Multiple Choice

The vertical beam deflection at B is calculated to be v_b. If the moment is doubled, the deflection at B will be:

• 1.5 x v_b

• 2 x v_b

• 3 x v_b

• 4 x v_b

​Answer: 2 x v_b

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​Must use the elastic curve equation (last column)

​- Doubling M doubles v