If the belt drive uses a 3 inch motor pulley and 5 inch driven pulley, and the motor runs at 3440 rpm, what is the fan speed?

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Multiple Choice

If the belt drive uses a 3 inch motor pulley and 5 inch driven pulley, and the motor runs at 3440 rpm, what is the fan speed?

Explanation:
Pulley size ratio in a belt drive determines how the output speed compares to the motor speed. The driven pulley speed is the motor speed multiplied by the ratio of the motor pulley diameter to the driven pulley diameter. Here, the motor pulley is 3 inches and the driven pulley is 5 inches, so the ratio is 3/5 = 0.6. Multiply the motor speed by this ratio: 3440 rpm × 0.6 = 2064 rpm. The fan runs at about 2064 rpm because the driven pulley is larger, which slows the output.

Pulley size ratio in a belt drive determines how the output speed compares to the motor speed. The driven pulley speed is the motor speed multiplied by the ratio of the motor pulley diameter to the driven pulley diameter. Here, the motor pulley is 3 inches and the driven pulley is 5 inches, so the ratio is 3/5 = 0.6. Multiply the motor speed by this ratio: 3440 rpm × 0.6 = 2064 rpm. The fan runs at about 2064 rpm because the driven pulley is larger, which slows the output.

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