Free Practice Quiz Question List

6 Trusses, Frames, and Machines Online Quiz Questions

Use this free practice quiz with 20 questions to review 6 Trusses, Frames, and Machines, test your knowledge, and prepare for your next test or exam.

20 questions

Choose one

1 point

A pinned link is loaded only at its two end connections. What can be concluded about the directions of the forces at its ends?

A
The end forces can point in any direction, independently of the link.
B
The end forces lie along the link's axis.
C
The member must also carry a couple at each end.
D
The end forces must be perpendicular to the link.

Choose one

1 point

Why is an FBD of the entire truss commonly drawn before analyzing individual joints or sections?

A
To determine every internal member force without using any other FBD.
B
To make internal forces at the joints appear as external loads on the whole truss.
C
To find any support reactions needed for subsequent analysis.
D
To prove that every member is in tension.

Choose one

1 point

A lever is pinned to a two-force link and also carries an external load. Which approach correctly analyzes the lever?

A
Isolate the lever as a rigid body, include the link force at the pin, and apply force and moment equilibrium.
B
Assume the link force on the lever acts along the lever's length.
C
Treat the lever as an ideal truss member and use only joint equilibrium.
D
Omit the link force because the link and lever are connected.

Choose one

1 point

When selecting a section cut in a planar truss, how many unknown member forces should the cut generally expose at most?

A
It must expose exactly two unknown member forces.
B
It generally exposes no more than three unknown member forces.
C
It must cut every member in the truss.
D
It must be a straight line through the truss.

Choose all

1 point

Select all statements that correctly describe ideal planar connections between members.

A
An ideal planar pin can transmit two force components.
B
An ideal planar pin transmits a couple as well as force components.
C
A fixed connection can transmit a couple.
D
A fixed connection cannot transmit force components.

Choose all

1 point

Select all statements that correctly describe interaction forces in free-body diagrams of connected parts.

A
Forces between parts inside a whole-assembly FBD are internal.
B
Internal forces between parts must be drawn as external forces on the whole-assembly FBD.
C
Separating connected parts makes their interaction forces relevant to the individual FBDs.
D
The force exerted by one separated body on another is equal in magnitude and opposite in direction to the return force.

True or false

1 point

If an unknown truss-member force is assumed to be in tension and the calculation gives a negative value, the member is in compression.

A
True
B
False

True or false

1 point

A machine can contain parts that move relative to one another and may transmit or multiply force.

A
True
B
False

True or false

1 point

If a model has as many independent equilibrium equations as unknowns, that alone guarantees that the structure is stable.

A
True
B
False

Written response

1 point

How many independent equilibrium equations are available for a general rigid body in planar static equilibrium? Enter an integer.

Written response

1 point

In the symmetric triangular truss described in the material, each sloping member has force magnitude $\frac{5\sqrt{13}}{3}$ kN. What is this magnitude in kN, rounded to the nearest 0.01 kN?

Fill in the blank

1 point

In the ideal simple-truss model, applied loads and support reactions act only at the .

Fill in the blank

1 point

When two connected bodies are separated for analysis, the forces they exert on each other form an equal-and-opposite .

Open ended

1 point

Describe a reliable sequence for analyzing a frame or machine made of connected planar bodies, from choosing free bodies through writing the equilibrium equations. Include how to represent connections and interaction forces.

Choose one

1 point

When analyzing an ideal truss joint whose member forces and external forces all meet at the pin, which equilibrium equations should you apply?

A
Use only the moment equation.
B
Use the two force equations, $\sum F_x=0$ and $\sum F_y=0$ .
C
Use all three rigid-body equations, including a moment equation.
D
Use no equilibrium equations because the forces are internal.

Choose one

1 point

In a planar frame, which statement correctly describes the idealized force and moment transmission at a pin connection compared with a fixed connection?

A
A pin transmits a couple but no force components.
B
A pin and a fixed connection both transmit a couple.
C
A pin transmits force components but no couple; a fixed connection can transmit a couple.
D
Neither a pin nor a fixed connection transmits force components.

Choose one

1 point

A pin-connected link and lever are isolated as separate free bodies. How should the interaction forces at their pin be represented?

A
Draw equal and opposite forces on the two respective free-body diagrams.
B
Draw the same force direction on both free-body diagrams.
C
Draw the connection force only on the body with the larger mass.
D
Omit both forces because the bodies were connected.

Choose one

1 point

When beginning a method-of-joints analysis, which joint is generally the most useful one to isolate first?

A
A joint with three or more unknown member forces, because the moment equation is available there.
B
A joint where every member force is already known.
C
A joint with no external force or reaction, regardless of its unknowns.
D
A joint with no more than two unknown member forces.

Written response

1 point

What is the standard term for a member acted on at more than two points, or by couples, so its force is not restricted to the member axis?

Written response

1 point

An ideal symmetric triangular truss has supports $A$ and $B$ 4 m apart and top joint $C$ centered 3 m above the base. A 10 kN downward load acts at $C$ . Using the method of joints, what is the magnitude of the axial force in the bottom member? Give your answer in kN, rounded to the nearest 0.01 kN; answers within 0.005 kN are accepted.