Correct answer
The crown wheel and pinion final drive.
The crown wheel and pinion final drive. Their tooth ratio provides a fixed reduction and increases transmitted torque; in this layout it also changes the direction of rotation. The gearbox selects different ratios, while the final-drive ratio does not change when another gear is selected. Universal joints transmit rotation across changing angles, and the differential allows the wheels to turn at different speeds when cornering.
Practice more D licence questions
A self-check with exam-style questions on Mechanics and maintenance. Free, no signup.
All options
The propeller shaft’s universal joints.
The differential’s side and planet gears, as though they were another selectable gearbox.
The crown wheel and pinion final drive.
Editorial status: editorially approved. This status does not certify legal review. Report a correction
Keep studying
Related questions
- To keep the engine in good condition, it is better to…
- You witness a road accident with possible injuries and assistance has not yet been organised. If you can help without creating another danger, how should you act?
- In a vehicle with a conventional electric starter motor, which component supplies the electrical energy to turn it?
- Why is the oil filtered?
- What type of brake is shown in the photograph?
- When snow chains are the chosen anti-skid option for a bus, what minimum placement does the General Vehicle Regulations require, while also following fitting instructions?