Bennett Mechanical Comprehension Practice Test 2025 - Free Practice Questions and Review Guide

To determine the number of rotations and the direction of wheel D based on the rotations of gear A, we need to understand the relationship between the number of teeth on the gears and their rotational movement.

Gear A has 24 teeth and undergoes 3 full rotations. When gear A rotates, it drives gear D, which has 48 teeth. The important aspect to consider is that for every complete rotation of gear A, it engages with gear D, moving it a fraction of a turn based on the relative sizes of the gears.

For gear A's 3 rotations, it moves gear D as follows:

1. Each complete turn of gear A will cause gear D to rotate according to the gear ratio. The gear ratio can be calculated as the number of teeth on gear D divided by the number of teeth on gear A. In this case, the gear ratio is 48 teeth (gear D) to 24 teeth (gear A), which simplifies to 2:1.

2. This means for every 1 rotation of gear A, gear D will rotate 0.5 times.

3. For 3 rotations of gear A, we multiply the number of rotations of gear A by the gear ratio, specifically:

- Gear