Discussion
Which purpose does an overdrive ratio serve?
Answer: B
An overdrive ratio turns the output shaft faster than the input, so the engine runs more slowly for a given road speed, improving fuel consumption and reducing noise and wear. Top gear in most modern gearboxes is an overdrive ratio. Torque at the wheels is correspondingly reduced. Naming what changes and what stays the same is the reliable route through questions of this shape. The order in which the effects act is what decides the outcome, so it is worth establishing first.
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