Red Seal Truck and Transport Mechanic Practice Exam

What is one of the main advantages of using a diesel engine in trucks?

1. Lower fuel efficiency

2. Higher torque at lower RPM

3. Quieter operation

4. Reduced durability

The correct answer is: Higher torque at lower RPM

One of the main advantages of using a diesel engine in trucks is the ability to produce higher torque at lower RPMs. This characteristic is particularly beneficial for heavy-duty applications, such as those commonly found in trucking and transport, where large loads need to be moved efficiently. Diesel engines are designed to generate significant power even at lower engine speeds, which enhances their capability to haul substantial weights without requiring high RPMs. This results in improved acceleration and better performance when climbing hills or starting from a stop, making diesel engines particularly suitable for commercial vehicles. Additionally, higher torque at lower RPMs contributes to better fuel efficiency during steady driving conditions, as the engine doesn’t have to work as hard to maintain power, thus consuming less fuel overall. This capability often leads to extended engine life and reduced wear on components, making diesel engines a preferred choice in the transportation industry.