Which term refers to a controller-mounted device with a small number of keys and a display?

• A. Dumb terminal
• B. Alarm printer
• C. Keypad display
• D. Notebook PC

Answer: (C)

The idea being tested is the kind of compact, locally mounted operator interface used on a controller. A keypad display fits this description: it is attached to the controller and provides a small set of keys for quick input or navigation, along with a display to show status or prompts. This is different from a dumb terminal, which is a general-purpose input/output device that often includes a full keyboard and a larger interface; it’s not typically described as a small, controller-mounted input unit. An alarm printer merely prints alarm messages and does not function as an input interface. A notebook PC is a portable, full-featured computer with a complete keyboard and broad capabilities, not the simple, integrated control panel described. So the term that best matches a controller-mounted device with a few keys and a display is keypad display.