Grade 10 power mechanics – Motor Vehicle Chassis Quiz

1. What is the main purpose of the vehicle chassis (frame)?

To increase the size of the engine cylinders
To support the vehicle body and major components such as engine and suspension
To cool the engine coolant more quickly
To control the fuel air mixture entering the engine
Explanation:

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?

Air suspension
Hydropneumatic suspension
Coil spring suspension
Leaf spring suspension
Explanation:

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?

Brake caliper
Wheel hub
Radiator fan
Shock absorber (damper)
Explanation:

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 cannot be used on four-wheel drive vehicles
A live axle is always made of aluminium and a dead axle is made of steel
A live axle transmits driving torque to the wheels while a dead axle only supports the vehicle weight
A live axle is only used on motorcycles and a dead axle on cars
Explanation:

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?

Belt and pulley steering
Rack and pinion steering
Chain-driven steering
Steering box with worm and sector
Explanation:

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?

Brake lining thickness
Engine timing and idle speed
Camber, caster and toe angles
Fuel injector spray pattern
Explanation:

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 brake
Band brake
Drum brake
Mechanical shoe brake
Explanation:

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?

To increase the fuel efficiency of the engine directly
To pump more oil into the engine
To connect the engine to the battery
To allow the driven wheels to rotate at different speeds while cornering
Explanation:

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?

Correct inflation
Slight over-inflation to manufacturer spec
Using higher-quality fuel
Under-inflation
Explanation:

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?

To distribute mass evenly around the wheel to prevent tyre vibration at speed
To change the tyre composition into a softer rubber
To make tyres sharper and cut through water better
To increase the tyre tread depth
Explanation:

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?

Ceramic bricks
Pure wood beams
High strength steel and sometimes aluminium
Glass panels
Explanation:

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?

To increase engine power during acceleration
To reduce brake fade during heavy braking
To reduce body roll during cornering by linking opposite wheels
To inflate tyres automatically
Explanation:

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?

Driveshaft (propeller shaft)
Timing belt
Fan belt
Steering column
Explanation:

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?

The forward or backward angle of the steering wheel
The tilt of the wheel inward or outward when viewed from the front of the vehicle
The angle of headlight beam
The distance between the road and the bumper
Explanation:

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?

Distributor cap
Synchroniser
Carburettor
Wheel bearing
Explanation:

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?

Rust formation on the exhaust pipe
A repeated bouncing motion of the vehicle usually at speed due to suspension issues
A type of fuel pump failure
Loss of battery charge when the lights are on
Explanation:

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?

Regular washing and application of anti-rust treatments
Painting tyres with oil
Adding sand to the fuel tank
Using only premium unleaded petrol
Explanation:

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?

The tilt of the steering axis viewed from the side; it affects straight-line stability and steering return
The amount of tyre tread showing on the roadside edge
The spacing between bolts on the wheel rim
The pressure needed to inflate the tyre
Explanation:

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?

Brake master cylinder (and brake booster in power brakes)
Oil pan
Exhaust manifold
Alternator
Explanation:

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?

Battery charging rate
Engine oil viscosity
Brake fluid boiling point
Grip on wet roads and stopping distance
Explanation:

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?

Radiator cap
Fuel filler cap
Jacking point and a suitable jack
Spare engine
Explanation:

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?

To cool down the engine oil
To increase tyre pressure automatically
To pump brake fluid through the lines
To provide flexible cushioning and reduce metal-to-metal contact
Explanation:

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?

Solid (beam) axle with leaf springs
Carbon fibre hollow axle with air springs
Single-piece aluminium axle with coil springs
Paperboard axle with rubber padding
Explanation:

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?

Uneven and rapid tyre wear and poorer steering response
Cooler brake discs and longer brake life
Improved radio reception
Better fuel economy and longer engine life
Explanation:

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?

To detect cracks, corrosion or looseness that could weaken vehicle structure
To increase tyre pressure automatically
To reduce engine compression slowly
To improve the colour of the paint on the roof
Explanation:

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?

Exhaust system
Ignition system
Suspension system
Fuel delivery system
Explanation:

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 main frame that supports the vehicle's engine, body and other components
Only the engine and transmission assembly
All the glass and windows of the vehicle
Just the steering wheel and column
Explanation:

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?

To support the vehicle's weight and provide mounting points for components
To store extra fuel for long trips
To make the vehicle's paint shine
To control the engine's ignition timing
Explanation:

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?

Tubular backbone with no cross members
Ladder frame
Space frame
Monocoque (unibody)
Explanation:

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?

Ladder frame
Roll cage only
Backbone with separate body
Monocoque (unibody)
Explanation:

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?

Suspension system
Battery and charging system
Wiper system
Exhaust system
Explanation:

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?

Glass
Paper
Rubber
Steel
Explanation:

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?

Rubber band spring
Small foam cushion
Paper spring
Leaf spring
Explanation:

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?

To increase the engine's power output
To control spring oscillations and reduce bouncing
To inflate the tyres
To change the vehicle's gear ratios
Explanation:

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?

The diameter of the wheels
The length of the engine block
The distance between the front and rear axles
The height from ground to roof
Explanation:

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?

The distance from front bumper to rear bumper
The height of the tyres
The distance between the left and right wheels on the same axle
The width of the steering wheel
Explanation:

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?

It sets the radio reception quality
It affects vehicle stability and the tendency to roll over
It determines the colour of the vehicle
It controls the engine oil type
Explanation:

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?

To pump fuel to the engine
To hold the windshield in place only
To provide lateral support and increase chassis rigidity
To clean the tyres while driving
Explanation:

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?

Washing only the windows
Polishing the tyres monthly
Undercoating or galvanizing the chassis
Filling the fuel tank with water
Explanation:

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)?

To tell the driver how much fuel is left
To tune the radio automatically
To measure tyre pressure
To uniquely identify the vehicle for registration and history checks
Explanation:

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?

The fluid capacity of the cooling system
How quickly the car can reach top speed
The capability to light up the dashboard
Resistance of the chassis to twisting forces
Explanation:

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?

To serve as the vehicle's battery casing
To act as the primary fuel tank
To mount the engine or suspension separate from the main body structure
To replace the tyres
Explanation:

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?

Because it will improve fuel economy immediately
Because it will make the radio play louder
Because rounds of paint can be saved
Because cracks reduce structural strength and can make the vehicle unsafe
Explanation:

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?

Accessory axle
Rear axle
Steering axle
Front axle
Explanation:

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?

To increase the size of the fuel tank
To ensure wheels track straight and reduce tyre wear
To change the engine oil type automatically
To make the seats more comfortable
Explanation:

Correct wheel alignment keeps tyres rolling true, improves handling and prevents uneven tyre wear.

46. What is a backbone chassis?

A central strong tube or beam running down the vehicle to which suspension components attach
A chassis made only for bicycles
A ladder frame without any cross members
A chassis made entirely of glass panels
Explanation:

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?

To make the vehicle softer for passengers
To make the chassis more likely to rust quickly
To change the engine type from petrol to diesel
To reduce vehicle weight and improve fuel economy
Explanation:

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?

Car battery and alternator
Headlight bulbs
Air filter and oil filter
Springs and dampers (shock absorbers)
Explanation:

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?

To reduce body roll during cornering
To make the exhaust louder
To increase boot space
To change the colour of the paint
Explanation:

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?

Inside the fuel tank to clean it
On the tyre tread to make it slippery
On the windshield to improve visibility
On suspension joints and bearings to reduce wear
Explanation:

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?

The vehicle body is mounted on a separate rigid frame (chassis)
The body floats on airbags with no frame
The vehicle has no chassis and uses only panels
The body and frame are a single welded unit
Explanation:

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.