CPC Eco-Driving & Fuel Efficiency 2

Question 1

What is AdBlue (DEF) and why is it important for modern diesel HGVs?

Accepted Answer

A urea solution injected into the exhaust to reduce NOx emissions to comply with Euro emissions standards

Answer

AdBlue is used in Selective Catalytic Reduction (SCR) systems to convert harmful nitrogen oxides (NOx) in exhaust gases into harmless nitrogen and water, enabling compliance with Euro 5/6 standards.

Question 2

Which gear-changing practice promotes fuel efficiency?

Accepted Answer

Changing up as early as possible (block shifting where appropriate) to keep engine revs low in the fuel-efficient range

Answer

Changing up early and block shifting keeps the engine in its fuel-efficient low-rev range; high revs in a lower gear burn significantly more fuel for the same vehicle speed.

Question 3

How does route planning contribute to eco-driving for HGV operators?

Accepted Answer

Selecting routes that minimise stop-start traffic, steep gradients and distance reduces fuel consumption and emissions

Answer

Routes with fewer traffic lights, less congestion, fewer steep hills and lower total distance all reduce fuel consumption; dynamic route planning using real-time traffic data maximises efficiency.

Question 4

What is the environmental benefit of reducing HGV fuel consumption through eco-driving?

Accepted Answer

Reduced CO₂, NOx and particulate emissions contributing to lower air pollution and greenhouse gas output

Answer

Each litre of diesel not burned avoids approximately 2.68 kg of CO₂; eco-driving also reduces NOx and particulate emissions that cause local air quality problems and health impacts.

Question 5

Predictive cruise control systems available on modern HGVs improve fuel economy by:

Accepted Answer

Using GPS topography data to adjust speed slightly before hills to optimise engine load and use gravity on descents

Answer

Predictive cruise control uses GPS and gradient data to accelerate slightly before a rise (using momentum) and reduce speed before a descent (using gravity), reducing engine work and fuel consumption.

Driver CPC Practice Test

Driver CPC Practice Test

CPC Eco-Driving & Fuel Efficiency 2