CALA Automotive Systems and Terminology 3 — Questions and Answers
Question 1: What is the difference between a vehicle's 'wheelbase' and its 'track width'?
- Wheelbase is the distance between left and right wheels; track width is front to rear axle distance
- Wheelbase is the front-to-rear axle distance; track width is the distance between left and right wheels on the same axle (Correct answer)
- Wheelbase refers to tire diameter; track width refers to tire section width
- Both terms describe the same measurement from different reference points
Correct answer: Wheelbase is the front-to-rear axle distance; track width is the distance between left and right wheels on the same axle
Wheelbase measures the distance between the front and rear axle centerlines, while track width measures the lateral distance between tire centerlines on the same axle.
Question 2: A loss adjuster encounters a vehicle with a damaged 'intercooler.' Which type of vehicle most commonly uses this component?
- Hybrid electric vehicles for battery cooling
- Turbocharged or supercharged vehicles to cool compressed intake air (Correct answer)
- Diesel vehicles exclusively, for exhaust gas recirculation
- High-performance naturally aspirated engines for oil cooling
Correct answer: Turbocharged or supercharged vehicles to cool compressed intake air
An intercooler (charge-air cooler) cools the compressed air from a turbocharger or supercharger before it enters the engine, increasing air density and power.
Question 3: What is 'toe' in the context of wheel alignment?
- The vertical tilt of the wheel relative to the road surface
- The inward or outward angle of the tires when viewed from above (Correct answer)
- The forward or rearward tilt of the steering axis
- The height difference between front and rear ride height
Correct answer: The inward or outward angle of the tires when viewed from above
Toe describes whether the fronts of the tires point inward (toe-in) or outward (toe-out) when viewed from directly above the vehicle.
Question 4: Which component in a modern vehicle's braking system modulates brake pressure to prevent wheel lockup during hard braking?
- Brake proportioning valve
- Anti-lock Braking System (ABS) modulator (Correct answer)
- Brake master cylinder
- Electronic brake force distribution (EBD) sensor
Correct answer: Anti-lock Braking System (ABS) modulator
The ABS modulator rapidly applies and releases brake pressure at individual wheels to prevent lockup and maintain steering control during emergency stops.
Question 5: What does the term 'OEM' mean, and why is it significant for parts replacement in a claim?
- Original Equipment Manufacturer; parts made by or to the specifications of the vehicle's maker (Correct answer)
- Overseas Equipment Manufacturer; imported aftermarket parts
- Optional Equipment Module; dealer-installed accessories
- Operational Error Measurement; a defect classification standard
Correct answer: Original Equipment Manufacturer; parts made by or to the specifications of the vehicle's maker
OEM parts are made by or to the exact specifications of the original vehicle manufacturer, which is relevant because many policies specify or exclude OEM vs. aftermarket parts.
Question 6: A vehicle is described as having 'independent rear suspension' (IRS). What is the key advantage of this design?
- Each rear wheel can move vertically without affecting the opposite wheel, improving handling and ride quality (Correct answer)
- The rear axle is rigidly connected for maximum towing capacity
- It eliminates the need for a rear differential in the drivetrain
- It uses fewer components than a solid rear axle, reducing repair costs
Correct answer: Each rear wheel can move vertically without affecting the opposite wheel, improving handling and ride quality
IRS allows each rear wheel to respond independently to road irregularities, improving ride quality, handling, and tire contact with the road.
Question 7: What is the function of a vehicle's 'catalytic converter'?
- To reduce exhaust noise by dampening sound waves
- To convert harmful exhaust pollutants into less harmful gases through chemical reactions (Correct answer)
- To recirculate exhaust gases back into the intake manifold
- To measure oxygen levels in the exhaust for fuel trim adjustments
Correct answer: To convert harmful exhaust pollutants into less harmful gases through chemical reactions
The catalytic converter uses precious metal catalysts to chemically convert hydrocarbons, carbon monoxide, and NOx in exhaust into CO2, water, and nitrogen.
CALA Automotive Systems and Terminology 3
What is the difference between a vehicle's 'wheelbase' and its 'track width'?