CAADE Vehicle Construction and Parts 3 — Questions and Answers
Question 1: Which glass type is used for automotive side windows because it shatters into small, relatively harmless pebbles upon breakage?
- Laminated glass
- Tempered glass (Correct answer)
- Borosilicate glass
- Polycarbonate glass
Correct answer: Tempered glass
Tempered glass is heat-treated to create surface compression stresses that cause it to fragment into small cubes rather than sharp shards when broken.
Question 2: What is the difference between a MacPherson strut and a double-wishbone suspension design in terms of vehicle construction?
- MacPherson uses two control arms; double-wishbone uses one integrated strut assembly
- MacPherson combines the shock absorber and spindle into one unit; double-wishbone uses separate upper and lower control arms (Correct answer)
- MacPherson is only for rear axles; double-wishbone is only for front axles
- MacPherson requires a subframe; double-wishbone does not
Correct answer: MacPherson combines the shock absorber and spindle into one unit; double-wishbone uses separate upper and lower control arms
The MacPherson strut integrates the shock absorber, spring perch, and steering knuckle into a single assembly, while double-wishbone uses two separate A-arms to locate the spindle.
Question 3: What is a 'torque box' in the context of unibody vehicle construction?
- The housing for the transmission and differential assembly
- A reinforced structural section at the junction of the rocker panel and floor pan that resists twisting forces (Correct answer)
- A gearbox inspection port used during damage assessment
- The mounting bracket for the engine torque strut
Correct answer: A reinforced structural section at the junction of the rocker panel and floor pan that resists twisting forces
Torque boxes are heavily reinforced structural nodes where major body sections meet, designed to resist torsional loads transmitted through the chassis.
Question 4: When assessing damage to a vehicle's door, what is the term for the structural beam inside the door that provides side-impact protection?
- Door sill reinforcement
- Side impact beam or intrusion bar (Correct answer)
- Hinge pillar gusset
- Striker plate brace
Correct answer: Side impact beam or intrusion bar
Side impact beams (intrusion bars) are steel or aluminum reinforcements inside door panels mandated by FMVSS 214 to resist lateral intrusion during crashes.
Question 5: Which vehicle construction technology uses computer-designed sections that progressively buckle in sequence to maximize energy absorption?
- Progressive crash management system
- Programmed deformation or 'triggered' crush zones (Correct answer)
- Sequential airbag deployment architecture
- Staggered unibody reinforcement
Correct answer: Programmed deformation or 'triggered' crush zones
Triggered crush zones use engineered weak points (initiators) stamped or pressed into rails so that collapse progresses in a controlled accordion pattern.
Question 6: What is the function of the firewall (also called the dash panel or bulkhead) in vehicle construction?
- It prevents the hood from opening at highway speeds
- It separates the engine compartment from the passenger cabin and provides structural support (Correct answer)
- It houses the vehicle's fuse box and relay center exclusively
- It acts as the mounting surface for the front bumper reinforcement
Correct answer: It separates the engine compartment from the passenger cabin and provides structural support
The firewall is a structural panel that isolates the passenger compartment from the engine bay, reduces noise/heat transfer, and provides attachment points for the dashboard and pedals.
Question 7: In vehicle construction, what is the purpose of 'hem flanges' on body panels?
- They are decorative stamped lines that define body style
- They are folded edges where two panels are crimped together to form a finished, strong seam (Correct answer)
- They are the gaps between panels measured during alignment inspection
- They are attachment points for body side moldings
Correct answer: They are folded edges where two panels are crimped together to form a finished, strong seam
Hem flanges are created by folding the edge of an outer panel over an inner panel edge, creating a clean, strong joint used on hoods, doors, decklids, and fenders.
CAADE Vehicle Construction and Parts 3
Which glass type is used for automotive side windows because it shatters into small, relatively harmless pebbles upon breakage?