Which term describes a switch operated by rotation?

• A. Rotary Switch
• B. Hydraulics
• C. Hydraulic Bleed
• D. Hydraulic Circuit

Answer: (A)

Rotational control is what a rotary switch does: turning a knob or dial rotates internal contacts to connect different terminals, giving multiple positions like on, off, or various modes. This mechanical action directly describes how a rotary switch operates, using rotation to select the circuit path. The other terms involve fluids and pressure rather than electrical switching: hydraulics is the study of fluid power in general, hydraulic bleed is releasing trapped air or fluid to restore proper operation, and a hydraulic circuit is a network of hydraulic components for power transmission. So the term that fits a switch operated by rotation is rotary switch.