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