Theory Quiz

Note: The Expected Completion Time for this quiz is 60 mins but, the Maximum Available Time to complete the quiz is 90 mins.

Total Available Time - 90 mins

Total Number of Questions - 45

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Understanding the Physics of Structural Mechanics - Theory Quiz

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1 / 45

When large deformation occurs in a structural simulation, _____. Select the best option to finish this sentence.

2 / 45

Consider a situation where there are two geometrically identical brackets, each made with a different grade of plastic that have different elastic moduli (stiffness). Both brackets are constrained and loaded in the same manner. Select two statements which are true, assuming linear response.

3 / 45

Which of the following statements is true for a strain gauge attached on a object undergoing deformation?

4 / 45

In designing a crank shaft, one must consider the time-history of displacements due to _____. Select the best option to complete the sentence.

5 / 45

Which one of the following is true for strain measurement using the strain gauge?

6 / 45

A natural frequency of zero Hz indicates that _____. Select the best option to complete the sentence.

7 / 45

Among other things, consideration of large deformations accounts for the effect of the change in the shape of a body. Select three items that may change due to large deformation which can also cause the response to become significantly nonlinear.

8 / 45

Select the three best options that are needed to prepare an engineering problem for simulation.

9 / 45

Which are two important properties needed to solve general dynamic systems? Select the two best options.

10 / 45

Consider a simulation of a steel beam of an office building where the maximum load capacity needs to be determined. What is the appropriate analysis type? Choose the best option.

11 / 45

What is the internal force on a particle of a body? Choose the best option.

12 / 45

Which of these applications requires performing a dynamic analysis?

13 / 45

The diagonal terms in a strain tensor represents _____.

14 / 45

Which of these applications requires performing a dynamic analysis?

15 / 45

Spin softening always involves _____. Select the best option to complete the sentence.

16 / 45

How is stress calculated in a particle of a body? Choose the best option.

17 / 45

The stress-stiffening matrix is determined from _____. Select the best option to complete the sentence.

18 / 45

Consider a one-dimensional bar with one end fixed while the other end has been extended by a displacement of $u_{0}$. The length of the bar = $L$. The one-dimensional stiffness of the material is $E$. If the strain over the bar is $u_{0}/L$, what is the stress over the bar? Choose the best option.

19 / 45

When wind vibrates a bridge such that a natural frequency is excited, the bridge may undergo failure due to _____. Select the best option to complete the sentence.

20 / 45

Which of the following statements are correct for boundary conditions and loads in a mechanical simulation? Choose the best option.

21 / 45

Which expression best illustrates how the effective stiffness of a system is reduced due to spin softening in a rotating structure?

22 / 45

Large strain formulation will always result in _____. Select the best option to complete the statement.

23 / 45

If von Mises stress is zero, which statement is true? Choose the best option.

24 / 45

When a material point is in equilibrium, how many unique terms are in its 3 x 3 strain tensor?

25 / 45

Select the phrase that best describes the nonlinear nature of contact.

26 / 45

Structural dynamics is the study of _____. Select the best option to complete the sentence.

27 / 45

Which of these materials is best suited for a flywheel to store most kinetic energy?

28 / 45

Which of the following assumption holds true for a Modal Analysis?

29 / 45

In simulation of a two-gear system, if the objective is to find out stress on gear tooth and reaction forces on the axes, what kind of geometry details can be safely removed from CAD geometry before proceeding to simulation? Choose two best options.

30 / 45

Which statement is true about a stress tensor? Choose two best options.

31 / 45

Consider two masses connected by a single spring, and the masses are only allowed movement in a single direction (1D). How many natural frequencies are there in this system?

32 / 45

When we place a dead weight on top of a viscoelastic material sample, what phenomenon do we expect to see?

33 / 45

Select the equation that best represents a structural nonlinear problem.

34 / 45

Which of the following statements is correct for dynamic analyses? Choose the best option.

35 / 45

Response of a structure to cyclic loads is studied using _____. Select the best option to complete the sentence.

36 / 45

Local equilibrium is the governing equation of a solid mechanics problem. How can one solve for local equilibrium? Choose three best options.

37 / 45

Consider contact defined between a linear elastic solid block and a smooth rigid platform on which the block rests with contact that is in an initially closed status. In one case, we define "No Separation" contact which implies that the block can slide freely without resistance, but cannot separate from platform. In another case, we define a "Frictionless" contact which implies that the block can both slide and separate from platform. If we apply a force to the block, perfectly normal to the contacting surface, driving the block further into the platform in uniform compression, which case would be considered a nonlinear simulation?

38 / 45

In a uniaxial stress-strain test, necking is generally observed before failure for which type of material? Select the best option.

39 / 45

A nonlinear analysis was performed of an engineered structure in operation, and nonlinear materials were defined. The resulting force-deflection curve showed the response to be linear. Which of the following statements is the most reasonable conclusion that can be made of the analysis?

40 / 45

Which results can be obtained from mechanical simulations of flexible bodies under applied loads? Choose three correct options.

41 / 45

While comparing the designs of two table fans, where design A uses Aluminum (rho = 2.7 g/cc) fan blades, and design B uses HDPE (rho = 0.95 g/cc) fan blades, assuming they both use the same electric motor and blades have identical dimensions, which design is expected to consume more energy while operating at same speed?

42 / 45

A dog bone tensile test of polyethylene illustrates which two types of nonlinearites?

43 / 45

When we clamp and hold a viscoelastic material sample under a constant amount of displacement, what phenomenon do we expect to see?

44 / 45

Which of the following is a characterization of small strain theory?

45 / 45

For structures that undergo vibrations under a constant load, the pre-stress state is often included in a modal analysis because _____. Select the best option to complete the sentence.

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