Limit switches are used in automation to detect end-of-travel and typically produce what kind of electrical signal?

• A. Analog signal
• B. Electrical signal
• C. PWM signal
• D. Digital data

Answer: (B)

A limit switch converts a mechanical end-of-travel event into a basic electrical state. When the mechanism reaches the limit, the switch contacts either close or open, producing a simple on/off electrical condition that can be read by a controller. This is not a varying analog signal, nor a modulated PWM waveform, nor a stream of digital data—the switch simply provides an electrical signal indicating the circuit's closed or open state.