CPC Vehicle Systems 2

Question 1

What is a retarder and what types are used on HGVs?

Accepted Answer

An auxiliary braking device — types include exhaust brakes, engine brakes (Jake brakes), and electromagnetic retarders

Answer

A speed limiting device

Answer

A GPS tracking system

Answer

A device to slow trailer loading

Question 2

What is the function of the DPF (Diesel Particulate Filter)?

Accepted Answer

To trap and periodically burn off soot particles from the exhaust, reducing particulate emissions

Answer

To filter the air entering the engine

Answer

To filter diesel fuel before injection

Answer

To reduce engine noise

Question 3

What is the function of air suspension on an HGV?

Accepted Answer

To provide a smoother ride, protect the load, allow ride height adjustment, and distribute weight more evenly

Answer

To make the cab more comfortable for the driver only

Answer

To increase vehicle speed

Answer

To reduce the need for tyres

Question 4

What is the 5th wheel coupling on an articulated HGV?

Accepted Answer

The coupling device on the tractor unit that connects to and supports the front of the semi-trailer

Answer

A spare wheel mounted on the chassis

Answer

The steering wheel

Answer

A wheel on the trailer landing gear

Question 5

Why is it important to check the coolant level regularly on an HGV?

Accepted Answer

Low coolant can cause the engine to overheat, potentially causing catastrophic engine damage

Answer

Coolant only affects the heater

Answer

Coolant is purely cosmetic — it colours the radiator fluid

Answer

Coolant levels only matter in winter

Question 6

What does the EBS (Electronic Braking System) provide over standard ABS?

Accepted Answer

Faster brake response times, automatic load-sensing, and integration with stability control systems

Answer

Louder brake noise for warning pedestrians

Answer

A cheaper braking system

Answer

Longer brake pedal travel