Final answer:
The valve terminologies mentioned are related to the engineering field. Rising stem with outside screw and yoke (OS&Y) refers to a type of valve where the stem moves up and down as the valve is opened or closed, and the stem is visible on the outside of the valve. (option a)
Step-by-step explanation:
The valve terminologies mentioned are related to the engineering field. Rising stem with outside screw and yoke (OS&Y) refers to a type of valve where the stem moves up and down as the valve is opened or closed, and the stem is visible on the outside of the valve. Closed stem with inside screw (CS&IS) refers to a type of valve where the stem is enclosed within the valve body and turns inside a screw mechanism. Closed stem with inside screw (CS&IS) refers to a type of valve where the stem is enclosed within the valve body and turns inside a screw mechanism. Fixed stem with center yoke (FS&CY) refers to a valve where the stem is fixed and does not move, and there is a yoke in the center of the valve.