Mechanical Engineering Multiple Choice Questions Exam Questions

This assignment presents a set of multiple-choice questions designed to assess understanding of fundamental mechanical engineering concepts. The questions cover a range of topics including stress analysis, torsional stress, Mohr's circle, principal stresses, shear stress, sectional modulus, fatigue loading, and the superposition principle. Each question is followed by a set of possible answers, challenging the user to select the most appropriate response. The assignment also touches upon the properties of materials, failure theories, and the behavior of beams under load. The questions are designed to test the ability to apply theoretical knowledge to practical engineering scenarios. The provided references include sources on stress and strain, and the construction of Mohr's circle.

Running head: MECHANICAL ENGINEERING MULTIPLE CHOICE QUESTION 1
Mechanical engineering Multiple Choice Questions
Firstname Lastname
Name of Institution

MECHANICAL ENGINEERING MULTIPLE CHOICE QUESTION 2
1. A keyway in a shaft that's transmitting torque will experience mostly _______
stress.
A. tensile
B. torsional
C. biaxial
D. direct shear
A keyway in a shaft that is transmitting torque will experience mostly
2. If the calculated angle for the x-y plane in a Mohr's circle is 56°, the true angle
of the principal normal plane is _______ from the original σx axis.
A. −56°
B. 112°
C. 56°
D. 28°
3. Which of the following cannot be found after constructing Mohr's circle?
A. Maximum shear stresses and the orientation of the plane
B. Value of the normal stresses that act on the planes where the maximum shear stresses act
C. Maximum and minimum principal stresses
D. The hoop stresses that act on an element with any orientation
4. A stress element has 13,800 psi of tensile stress acting in the reference x-axis
and a counterclockwise shear stress of 5,600 psi acting at the same time. The
maximum principal stress on the element is approximately _______ psi.
A. 19,400
B. 8,200
C. 15,800
D. 2,000

MECHANICAL ENGINEERING MULTIPLE CHOICE QUESTION 3
5. The superposition principle is used
A. for calculating individual stresses.
B. only in special cases.
C. when the material is subject to both tensile and bending stresses.
D. while stress concentrations are present.
6. The property of a material that resists fatigue loading is known as the
A. stress ratio.
B. yield strength.
C. endurance strength.
D. creep.
7. Two ¼-inch OD support rods hold a uniformly distributed weight of 450
pounds. The tensile stress in each rod will be _______ psi.
A. 4584
B. 15,586
C. 9184
D. 49,000
8. When a beam is supported at both ends and loaded by a downward force in
the middle, the
A. maximum stress is at the ends of the beam.
B. top of the beam is in compression and the bottom of the beam is in tension.
C. stress is uniform throughout the beam.
D. top of the beam is in tension and the bottom is in compression.

MECHANICAL ENGINEERING MULTIPLE CHOICE QUESTION 4
9. When you're constructing a Mohr's circle for a stress element,
the
A. −σ value is always negative.
B. radius of the circle is the σx plus the shear stress value.
C. vertical axis is the σy value.
D. center of the circle is the average of σx and σy
10. A solid circular shaft with a two-inch diameter has a sectional modulus of
_______ in3.
A. 4.0
B. 0.785
C. 3.142
D. 0.337
11. A stress element has 13,800 psi of tensile stress acting in the reference x-
axis, and at the same time a counterclockwise shear stress of 5,600 psi. The
angle of the principal plane of maximum normal stress is
A. 64.5°.
B. 45°.
C. 39.06°.
D. 19.5°
12. A rectangular beam of constant cross-section is harder to bend when force
is applied in the direction of the long side. This is because the
A. modulus of elasticity is different in each direction.
B. sectional modulus, S, is greater than bending along the narrow dimension.
C. beam isn't in pure bending when bent along the long dimension.
D. stress is greater when the beam is bent in that direction.

MECHANICAL ENGINEERING MULTIPLE CHOICE QUESTION 5
13. Which of the following statements is correct?
A. A stress element with only tensile stress in the x-axis reference direction won't have any
shear stress present.
B. The maximum shear stresses occur in a plane 90° from the x-axis reference plane.
C. Tensile stresses in the x-axis reference plane can be canceled by compressive stresses in
the y-axis plane.
D. Positive shear stresses are always balanced by counterclockwise shear stresses
14. _______ is measured in megapascals (MPa).
A. Momentum
B. Wear
C. Torque
D. Stress
15. In a cantilever beam that's 48 inches long and supports a load of 200 pounds
directly downward at the end of the beam, what sectional modulus is required to
limit the stress to a maximum of 18,000 psi?
A. 12,950 in4
B. 9,600 in4
C. 1.875 in3
D. 0.533 in3
16. Which of the following is used to characterize the manner in which applied
stresses vary?
A. Endurance load
B. Design factor
C. Stress ratio
D. Impact strength

MECHANICAL ENGINEERING MULTIPLE CHOICE QUESTION 6
17. The _______ is a failure hypothesis based on distortion energy that always
reports a stress in positive values.
A. maximum shear stress postulate
B. Soderberg criteria
C. Von Mises theory
D. maximum normal stress corollary
18. Which of the following relations expresses the strain that results from simple
tensile forces?
A. (S × L)/
A
B. FL/EA
C. FLEA
D. (T × c)/J
19. Changes in the diameter of a power shaft are made as gradually as possible
because
A. the mating parts will assemble more easily.
B. calculating stresses can take time.
C. machining is more difficult for rapid dimensional changes.
D. the highest stresses occur in places where changes in dimensions occur.
Why do power shaft diameter changed gradually
20. Positive shear stresses tend to
A. rotate a stress element clockwise.
B. rotate a stress element counterclockwise.
C. act in the y-axis reference plane.
D. act in the x-axis reference plane

MECHANICAL ENGINEERING MULTIPLE CHOICE QUESTION 7
References
Jolly, R. J. H., & Sanderson, D. J. (2014). A Mohr circle construction for the opening of a pre
existing fracture. Journal of Structural Geology, 19(6), 887-892.
Young, W. C., Budynas, R. G., & Sadegh, A. M. (2012). Roark's formulas for stress and strain
(Vol. 7). New York: McGraw-Hill.