Discussion
Which arrangement provides reverse in a typical manual gearbox?
Answer: C
A sliding idler gear placed between the layshaft gear and the output gear reverses the direction of rotation, and being straight cut and unsynchronised it produces the familiar whine and requires the vehicle to be stationary. Modern gearboxes often synchronise reverse and use constant mesh with a dog clutch. The epicyclic arrangement is used in automatic transmissions. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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