Which cylinder type is defined as having one working port and returning by external force or by a spring?

Which cylinder type is defined as having one working port and returning by external force or by a spring?

• A. Single-acting cylinder
• B. Double-acting cylinder
• C. Hydraulic Motors
• D. Poppet valves

Answer: (A)

The main idea is that a single-acting cylinder uses pressure on only one port to move in one direction, and its return stroke is achieved by an external force such as a spring or gravity. Because there’s only one working port, the fluid pushes the piston in the desired direction, and the return is accomplished without applying pressure to the opposite side. This contrasts with a double-acting cylinder, which has two ports and uses hydraulic pressure to both extend and retract. Hydraulic motors and poppet valves are different components—they don’t fit the description of a cylinder returning by an external force. So the described cylinder type is the single-acting cylinder.