In a gear drive with a 6-tooth driver gear and an 18-tooth driven gear, the gear ratio is ______.

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Multiple Choice

In a gear drive with a 6-tooth driver gear and an 18-tooth driven gear, the gear ratio is ______.

Explanation:
In a simple gear pair, the gear ratio is found by dividing the number of teeth on the driven gear by the number of teeth on the driver gear. It also tells how many turns the driver must make for the driven to complete one turn (a higher ratio means more driver revolutions per driven turn). Here, the driven gear has 18 teeth and the driver has 6 teeth, so the ratio is 18 ÷ 6 = 3. This means the driver must rotate three times for the driven gear to rotate once, and the output torque is increased by about a factor of three (ignoring losses). Therefore the gear ratio is 3 to 1, or 3.0.

In a simple gear pair, the gear ratio is found by dividing the number of teeth on the driven gear by the number of teeth on the driver gear. It also tells how many turns the driver must make for the driven to complete one turn (a higher ratio means more driver revolutions per driven turn). Here, the driven gear has 18 teeth and the driver has 6 teeth, so the ratio is 18 ÷ 6 = 3. This means the driver must rotate three times for the driven gear to rotate once, and the output torque is increased by about a factor of three (ignoring losses). Therefore the gear ratio is 3 to 1, or 3.0.

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