Red Seal Truck and Transport Mechanic Practice Exam 2025 - Free Red Seal Mechanic Practice Questions and Study Guide

A direct effect of poor gear ratio on a truck leads to decreased fuel efficiency. The gear ratio determines how power is transmitted from the engine to the wheels, and an inappropriate ratio can result in the engine operating outside its optimal performance range. When the engine is over-revving or under-revving, it can lead to inefficient combustion, causing the engine to consume more fuel for the same distance traveled. This inefficiency directly impacts fuel economy, making the truck less cost-effective to operate.

High torque, improved acceleration, and reduced tire wear are not direct consequences of a poor gear ratio. A proper gear ratio is necessary to achieve the right balance of power and efficiency, and an incorrect ratio can compromise these performance aspects. Properly calibrated gear ratios help ensure that the engine operates efficiently across a range of speeds, optimizing fuel consumption.