Which technician is correct regarding spur gears and helical gears?

The choice indicating that Technician B is correct likely stems from a specific understanding of the fundamental characteristics of spur gears and helical gears. Helical gears are distinguished by their angled teeth, which engage gradually and smoothly compared to the straight teeth of spur gears. This unique design of helical gears allows for more contact between the teeth during operation, which reduces noise and vibration, resulting in quieter and smoother gear operation.

Moreover, helical gears can transmit higher loads and allow for better torque transfer than spur gears due to this improved tooth engagement. This characteristic is critical in applications where higher efficiency and quieter performance are desired.

On the other hand, spur gears, although simpler and easier to manufacture, typically operate with more noise and can experience more abrupt loading. They are generally preferred in less demanding applications where efficiency and performance are not the highest priorities.

Therefore, if Technician B pointed out the advantages of helical gears over spur gears, such as smoother operation or efficient load handling, this would solidify his correctness in the context of gear design and application.