Week #4 - Chassis Frame (Chapter 32) Flashcards
True or False: Some aluminum alloy truck frame rails can have up to twice the yield strength of mild steel.
True
What causes galvanic corrosion between frame members?
Dissimilar metals in direct contact
When C-channel stock is used for a frame reinforcement, which of the following must be true?
a. It should be installed on only the outside of the frame rail.
b. It must have the same yield strength as the original frame rail
c. It should be welded directly to the frame rail
d. It must be of the same dimensions as the original frame rail
b. It must have the same yield strength as the original frame rail
What method would do most to ensure that a frame hole was exactly 3/4 inch (19 mm) in size?
Finish with a 3/4-inch (19mm) taper reamer
When a frame is said to have excessive flexibility and twist, which of the following would do most to repair the problem?
a. increasing the section modulus
b. increasing the resist bend moment
c. decreasing the section modulus
d. decreasing the resist bend moment
a. increasing the section modulus
True or False: When assembling frame and suspension components, you should upgrade all SAE Grade 5 fasteners to Grade 8.
False
True or False: When extending a frame, you should use a 60-degree angle butt joint.
True
A straight truck is involved in an offset collision. What type of frame damage would most likely result?
Diamond
The longitudinal components of a truck chassis ladder frame are called ____
rails
Which of the following frame materials has the highest yield strength?
a. high-strength, copper-aluminum alloy
b. mild steel
c. high-strength, untempered alloy steel
d. medium-stength, magnesium-silicon- aluminum alloy
a. high-strength, copper-aluminum alloy
True or False: Tempered frame rails allow highway tractors to achieve a higher specified RBM with lighter frame rails
True
The highest stress that a material can stand without permanent deformation or damage is know as ____
yield strength
True or False: Dump trucks usually require a lower section modulus than highway tucks.
False
What are the factors of resist bend moment (RBM)?
Yield strength and section modulus
True or False: In bolting equipment to the chassis frame, you should use existing holes whenever possible.
True
True or False: Most highway tractors use tempered steel, C-channel frame rails.
True
True or False: When assembling frame and suspension components, replacing SAE Grade 8-rated Huck fasteners with Grade 8 nuts and bolts is acceptable.
True
True or False: When fifth wheel brackets are bolted to frame rails, the section modulus over that section of the frame is increased.
True
What procedure do most manufacturers recommend when a frame rail is damaged?
Replacement
When projecting a frame diagram to a floor when making a frame alignment check, what tool is used to transfer the reference points on the truck chassis to the floor?
A plumb bob
What is the correct procedure and the material used to weld a hardened truck frame rail extension into position?
Electric arc with AWS E-11018 electrode
When a load is applied to a C-channel frame rail from above, which of the following statements should be true?
a. The neutral fiber is under compressional stress
b, The lower flange is under tensional stress
c. The upper flange is under tensional stress
d. The lower flange is under compressional stress
b. The lower flange is under tensional stress
True or False: When extending a frame, you should weld a frame extension butt joint then grind the weld cap run flush with the frame.
True
True or False: Installing inverted L-section reinforcements is preferred to L-section reinforcements because the section modulus is not affected.
False
rue or False: In bolting equipment to the chassis frame, you should avoid drilling holes in the frame neutral fiber.
False
Which of the following is a function of the cross-members of the chassis frame?
a. to reduce torsional stress transmitted from one rail to another
b. to control axial rotation and longitudinal motion of the rails
c. to protect wires and tubing that are routed from one side of the vehicle to the other
d. all of the above
d. all of the above
