Which term best describes the category of machines utilizing friction for movement in escalator systems?

• A. Friction Machines
• B. Routine Inspections
• C. Sprocket Alignment
• D. Maximum Speed

Answer: (A)

Motion is transmitted by contact grip rather than by gears or chains when a machine is described as using friction for movement. In escalator systems, identifying components that move through friction helps technicians focus on the parts where grip, surface condition, and clamping force matter most, since wear and slip on those contact surfaces govern performance. The other options point to a maintenance activity (routine inspections), a drive system detail not about friction-based motion (sprocket alignment), or a performance spec (maximum speed), none of which classify the drive method. So the term that best describes machines moving by friction is friction machines.