Grade 10 power mechanics – Motor Vehicle Chassis Quiz
1. What is the main purpose of the vehicle chassis (frame)?
The chassis (frame) provides the structural support for the body, engine, suspension and other components, keeping the vehicle rigid and maintaining alignment.
2. Which type of suspension commonly uses layers of curved metal strips bolted together?
Leaf springs are made from stacked, curved steel plates (leaves) and are traditional on many trucks and older vehicles for supporting loads.
3. Which component absorbs and controls unwanted bouncing and oscillation of the vehicle's springs?
Shock absorbers dampen spring motion, converting kinetic energy into heat to control bouncing and provide a smoother ride.
4. What is the main difference between a live axle and a dead axle?
A live axle carries driving torque to the wheels (often rear axle on driven vehicles), whereas a dead axle is a non-driven support for wheels.
5. Which steering system is commonly used in modern small cars for its simplicity and precision?
Rack and pinion steering gives direct, precise control and is compact, making it common in modern small cars.
6. What does wheel alignment adjustment change to improve tyre wear and handling?
Alignment adjustments change camber, caster and toe to ensure tyres contact the road correctly, reducing uneven wear and improving handling.
7. Which type of brake uses a hydraulic piston to squeeze pads against a spinning disc?
Disc brakes use hydraulic pistons to clamp brake pads onto a rotor (disc), providing effective stopping power and good heat dissipation.
8. What is the purpose of the differential in the rear axle of a vehicle?
The differential lets left and right driven wheels rotate at different speeds during turns, preventing tyre scrubbing and easing steering.
9. Which tyre pressure condition may cause poor fuel economy and increased tyre wear on the edges?
Under-inflated tyres have higher rolling resistance (worse fuel economy) and excessive wear on tyre edges due to more flexing.
10. What is the main function of wheel balancing?
Wheel balancing adds weights so the wheel-tyre assembly spins evenly, reducing vibration, wear and strain on suspension components.
11. Which material is commonly used for modern vehicle chassis frames because of its strength and lighter weight?
Modern chassis use high-strength steel and often aluminium to balance strength, stiffness and lower weight for better performance and efficiency.
12. What is the purpose of anti-roll (sway) bars in a vehicle's suspension?
Anti-roll bars connect left and right suspension to resist body roll in turns, improving stability and handling.
13. Which part transfers torque from the gearbox to the differential in a rear-wheel drive car?
The driveshaft transmits engine torque from the gearbox to the rear differential in rear-wheel drive vehicles.
14. What is camber angle in wheel alignment?
Camber is the inward (negative) or outward (positive) tilt of a wheel and affects tyre contact and wear.
15. Which component supports the wheel and allows it to rotate smoothly on its axle?
Wheel bearings are mounted at the hub and allow the wheel to rotate with minimal friction while supporting load.
16. What is porpoising in a vehicle chassis context?
Porpoising describes oscillatory vertical motion caused by improperly damped suspension or improper setup at certain speeds.
17. Which maintenance practice helps prevent corrosion of the chassis in Kenya's rainy and coastal areas?
Cleaning to remove salt, mud and grime and applying anti-rust coatings reduce corrosion risk, especially in wet or coastal climates.
18. What is caster angle and how does it affect steering?
Caster is the forward or rearward tilt of the steering axis which influences stability and how the steering wheel returns to centre.
19. Which brake system component stores hydraulic pressure and helps maintain braking force in power-assisted brakes?
The master cylinder creates hydraulic pressure and the booster (in power brakes) helps amplify pedal force for easier braking.
20. What does tyre tread depth affect most directly?
Adequate tread depth channels water away and maintains contact, improving wet grip and reducing stopping distance.
21. Which part is used to lift a vehicle safely when changing a wheel?
Vehicles have designated jacking points to safely support lifting with a jack when changing tyres; using wrong points can damage the chassis.
22. What is the role of bushes (bushings) in suspension and steering linkages?
Bushes isolate vibration, allow controlled movement and reduce noise and wear where suspension and steering parts pivot.
23. Which type of axle is most likely used on heavy trucks to carry heavy loads and withstand rough roads?
Heavy trucks commonly use solid beam axles and leaf spring suspensions for strength, load capacity and durability on rough roads.
24. What is the effect of excessive toe-in or toe-out on tyres?
Incorrect toe causes tyres to scrub while rolling, leading to uneven wear and degraded handling.
25. Why is regular inspection of chassis mounting points and welds important?
Checking mounts and welds finds structural problems early, preventing failures that could cause unsafe driving conditions.
26. Which system in the chassis helps support the weight of the vehicle and keeps the wheels in contact with the road?
The suspension supports vehicle weight, absorbs bumps and keeps tyres in contact with the road for control and comfort.
27. What is the vehicle chassis?
The chassis is the structural frame that supports and holds the engine, body, suspension and other major components of a vehicle.
28. Which is the primary function of a motor vehicle chassis?
The chassis supports the vehicle and provides secure mounting points for the engine, suspension, body and other systems.
29. Which chassis type is most commonly used on Kenyan matatus and pickups?
Ladder frames are strong, simple and commonly used on pickups and matatus because they handle heavy loads and rough roads well.
30. Which chassis design is typical for modern small cars and many sedans?
Monocoque designs integrate the body and chassis into one structure, which reduces weight and improves handling for passenger cars.
31. Which vehicle system connects the chassis to the wheels and helps absorb road shocks?
The suspension system links the chassis to the wheels and uses springs and dampers to absorb shocks and maintain tyre contact.
32. What material is most commonly used for vehicle chassis construction?
Steel is commonly used because it offers high strength, durability and is cost-effective for chassis manufacturing.
33. Which type of spring is commonly fitted to the rear of heavy-duty pickups and matatus?
Leaf springs are robust and handle heavy loads well, making them common on the rear of pickups and commercial vehicles.
34. What is the main purpose of a shock absorber (damper) on the chassis?
Shock absorbers damp the motion of springs so the vehicle does not continue to bounce after hitting a bump.
35. What does the wheelbase of a vehicle measure?
Wheelbase is measured between the centres of the front and rear axles and affects ride comfort and stability.
36. What is meant by the track width of a vehicle?
Track width is the lateral distance between wheels on the same axle and affects stability and cornering.
37. Why is centre of gravity important for a vehicle's chassis?
A lower centre of gravity improves stability and reduces the risk of rollover during cornering or sudden maneuvers.
38. What is the function of a cross member in a chassis?
Cross members tie the frame rails together and increase the structure's strength and resistance to bending and twisting.
39. Which method helps protect a chassis from rust and corrosion in Kenya's climate?
Applying undercoating or using galvanized steel protects the chassis from moisture and salt, reducing corrosion.
40. What is the purpose of the chassis number or vehicle identification number (VIN)?
The chassis number/VIN is a unique identifier used for registration, ownership records and tracking a vehicle's history.
41. What does torsional rigidity of a chassis refer to?
Torsional rigidity measures how much the chassis resists twisting; higher rigidity improves handling and reduces body flex.
42. What is a subframe used for in many modern vehicles?
A subframe is a smaller frame attached to the body that supports major components like the engine or suspension, isolating them from the passenger compartment.
43. Why should a chassis be inspected for cracks and damage?
Cracks weaken the chassis and can lead to failure under load, risking control loss or collapse of mounting points.
44. In a rear-wheel drive vehicle, which axle delivers engine power to the road?
In rear-wheel drive layouts the driveshaft transmits power to the rear axle which turns the rear wheels.
45. Why is wheel alignment important for the chassis and tyres?
Correct wheel alignment keeps tyres rolling true, improves handling and prevents uneven tyre wear.
46. What is a backbone chassis?
A backbone chassis uses a central tubular member for strength and mounts other components to that central beam.
47. Why might a manufacturer use aluminium in parts of the chassis?
Aluminium is lighter than steel and helps reduce overall vehicle weight, improving fuel efficiency and handling.
48. Which parts absorb road shocks before they reach the vehicle body?
Springs absorb energy from bumps and dampers control the spring motion so shocks are not transferred harshly to the body.
49. What is the purpose of an anti-roll bar (sway bar) on a chassis?
An anti-roll bar connects left and right suspension to resist body roll and improve cornering stability.
50. Where should grease be applied during chassis maintenance?
Greasing suspension pivots and bearings reduces friction and wear, extending component life and keeping the chassis working properly.
51. What does 'body-on-frame' construction mean?
Body-on-frame means the body is attached to a distinct frame; this is common for trucks and heavy-duty vehicles because it is strong and easier to repair.