In a pneumatic system, which lines are considered conductors?

• A. Supply line and actuator line
• B. Input line and output line
• C. Main line and pilot line
• D. Control line and exhaust line

Answer: (A)

In a pneumatic system, conductors are the paths that carry compressed air from the source to where it does work. The supply line is the main entry for the pressurized air into the system, providing the energy. The actuator line is the path from the control valve to the actuator (such as a cylinder) that delivers that energy to move the piston. These two lines are the ones directly transferring air power to produce motion.

Other lines have different roles. A main line and pilot line relate to distributing air and providing control signals, not the direct energy path to the actuator. A control line carries signals to valves, and an exhaust line vents air after work is done. While essential for operation, they don’t serve as the direct energy-conveying routes to the actuator.