A smoke detector must be marked with its nominal production ______ and tolerance.

• A. Sensitivity
• B. Voltage
• C. Color
• D. Current

Answer: (A)

The main idea is that smoke detectors are rated by how sensitive they are to smoke. The label on a detector includes its nominal sensitivity and a tolerance to show the expected triggering threshold and how much variation is allowed between units. This helps ensure that every device in a system will respond within a predictable range—neither giving nuisance alarms from being too sensitive nor failing to alarm from being too insensitive. Voltage, color, or current aren’t the performance measures used for this marking, so they aren’t included in the nominal production specification.