What term describes the drive options that include ball screw and hydraulic varieties?

• A. Platform Control Wiring
• B. Hoistway Limit Switches
• C. Manual Relief Valve
• D. Drive Types

Answer: (D)

Drive options describe how the escalator or moving walk is propelled. Ball screw and hydraulic varieties are both ways to provide the motion, so they fall under drive types—the method used to move the system.

The other items aren’t about propulsion methods. Platform control wiring covers the signaling and control circuits between components, not how motion is produced. Hoistway limit switches are safety devices that stop travel at ends, not the drive mechanism. A manual relief valve is part of hydraulic fluid control to release pressure, not the way the machine is driven.

So the best answer is drive types, since it specifically names the mechanism by which movement is generated.