NCCER Millwright Practice Exam

What type of fitting should be used with a pneumatic actuator for optimal performance?

1. Plastic fittings

2. Metal fittings

3. Flexible fittings

4. Standard fittings

The correct answer is: Metal fittings

Using metal fittings with a pneumatic actuator is recommended for optimal performance due to several reasons. Metal fittings are more durable and can withstand the high pressures typically involved in pneumatic systems. They provide a secure and leak-proof connection, which is essential for maintaining the efficiency and safety of the system. Additionally, metal fittings are resistant to wear and can handle various environmental conditions without degrading, making them suitable for both indoor and outdoor applications. Their strength and resilience prevent issues such as corrosion and fatigue that may arise with other materials over time. While plastic fittings might be lightweight and easier to handle, they generally lack the robustness required for high-pressure applications and can become brittle under certain conditions. Flexible and standard fittings may not provide the same level of durability or leak prevention as metal fittings, potentially leading to failures in the system’s operation. Thus, metal fittings are the ideal choice when considering the demands of pneumatic actuation.