NEIEP Mechanics Practice Exam

Which drive groove configuration requires the use of a double-wrapped secondary sheave?

1. V Groove

2. U Groove

3. L Groove

4. Flat Groove

The correct answer is: U Groove

The drive groove configuration that requires the use of a double-wrapped secondary sheave is the U Groove. This design facilitates the use of a double-wrapped belt, which provides improved traction and greater stability during operation. In a U Groove, the belt is designed to fit snugly within the groove, creating a more secure fit that helps prevent slippage under load. The U Groove's shape allows the belt to be wrapped around the sheaves more times than other configurations, enhancing its ability to transfer power efficiently and accommodate the necessary torque. This is particularly important in applications where high tension or heavy loads are involved, as the double-wrapping significantly increases the surface contact between the belt and the groove, ensuring better performance and durability. Other groove configurations, like V Groove, L Groove, and Flat Groove, do not require a double-wrapped secondary sheave because their designs accommodate belts more suited to simpler applications or different tensioning methods. In comparison, the U Groove's unique shape and the need for a double-wrapped sheave is key for optimal operation in specific engineering scenarios.