What takes the place of several switches in a control panel?

• A. Rotary selector
• B. Relays
• C. Fuses
• D. Microswitch

Answer: (A)

The concept being tested is replacing multiple manual switches with a single, multi-position control. A rotary selector switch acts as a common hub with several sets of contacts. When you rotate to a particular position, the common contact connects to a specific group of outputs, effectively switching several circuits at once. This consolidates what would otherwise be many individual switches into one compact device, reducing wiring complexity and panel clutter. It’s especially useful when you want a single deliberate action to select a mode or function that involves multiple circuits changing state together, often with multiple poles so several circuits switch in unison.

Relays, fuses, and microswitches don’t provide that same consolidation. Relays are electrically driven switches for remote actuation, not a single control that routes several circuits simultaneously from one knob. Fuses protect circuits, not control them. Microswitches are individual, actuation-based switches, not a centralized multi-position control.