In a belt drive, if the driven pulley has a larger pitch diameter than the driver, the system provides a speed ________.

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Study for the PMMI Mechanical Drives Test with engaging multiple choice questions and detailed explanations. Enhance your knowledge on mechanical drives and get ready for your exam!

Multiple Choice

In a belt drive, if the driven pulley has a larger pitch diameter than the driver, the system provides a speed ________.

Explanation:
Belt drive speed is set by the inverse relationship of pulley sizes: the driven pulley’s rotation speed equals the driver’s speed times the ratio of the driver’s pitch diameter to the driven’s pitch diameter. If the driven pulley has a larger pitch diameter, that ratio is less than one, so the driven rotates slower than the driver. This is a speed reduction. If the driven were smaller, you’d get a speed increase; if the diameters were equal, there would be no change. Unpredictable results would come from slip or other non-ideal conditions. Hence, the system provides a speed reduction.

Belt drive speed is set by the inverse relationship of pulley sizes: the driven pulley’s rotation speed equals the driver’s speed times the ratio of the driver’s pitch diameter to the driven’s pitch diameter. If the driven pulley has a larger pitch diameter, that ratio is less than one, so the driven rotates slower than the driver. This is a speed reduction. If the driven were smaller, you’d get a speed increase; if the diameters were equal, there would be no change. Unpredictable results would come from slip or other non-ideal conditions. Hence, the system provides a speed reduction.

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