In order to distribute the side pressures over a wide area of the cylinder walls and liners, which of the listed types of pistons are used in modern low pressure air compressors?

Correct Answer: Option C — Trunk

Trunk pistons feature a long skirt design that provides a large bearing surface area against the cylinder wall. This configuration effectively distributes side thrust loads generated by the connecting rod angle, minimizing localized wear on the liners and ensuring stable piston movement during the compression stroke in reciprocating compressors.