In a belt drive, how is velocity ratio defined numerically? For driver diameter 80 mm and driven diameter 40 mm, what is VR?

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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, how is velocity ratio defined numerically? For driver diameter 80 mm and driven diameter 40 mm, what is VR?

Explanation:
Velocity ratio in a belt drive is defined as the ratio of the driving pulley diameter to the driven pulley diameter. Since the belt’s linear speed is the same on both pulleys, the rotational speeds vary inversely with diameter, and using this convention VR = D1/D2. With a driver diameter of 80 mm and a driven diameter of 40 mm, VR = 80/40 = 2. This means the driven pulley makes two revolutions for every one revolution of the driver (the driver is larger, so it turns more slowly in terms of RPM, while the driven turns twice for each driver turn).

Velocity ratio in a belt drive is defined as the ratio of the driving pulley diameter to the driven pulley diameter. Since the belt’s linear speed is the same on both pulleys, the rotational speeds vary inversely with diameter, and using this convention VR = D1/D2.

With a driver diameter of 80 mm and a driven diameter of 40 mm, VR = 80/40 = 2. This means the driven pulley makes two revolutions for every one revolution of the driver (the driver is larger, so it turns more slowly in terms of RPM, while the driven turns twice for each driver turn).

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