In a simple gear pair with a driver having 20 teeth and a driven gear with 40 teeth, what is the speed ratio of the driven gear to the driver?

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Multiple Choice

In a simple gear pair with a driver having 20 teeth and a driven gear with 40 teeth, what is the speed ratio of the driven gear to the driver?

Explanation:
In a simple gear pair, the speed ratio is the inverse of the tooth-count ratio. The driver has 20 teeth and the driven gear has 40 teeth, so the driven gear must rotate at half the speed of the driver. The speed ratio of the driven to the driver is 20/40 = 0.5. In other words, the driven gear runs at 50% of the driver’s speed (ignoring losses), with roughly double the torque being transmitted.

In a simple gear pair, the speed ratio is the inverse of the tooth-count ratio. The driver has 20 teeth and the driven gear has 40 teeth, so the driven gear must rotate at half the speed of the driver. The speed ratio of the driven to the driver is 20/40 = 0.5. In other words, the driven gear runs at 50% of the driver’s speed (ignoring losses), with roughly double the torque being transmitted.

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