A smoke detector must be marked with its nominal production ______ and tolerance. Which word completes the sentence?

A smoke detector must be marked with its nominal production ______ and tolerance. Which word completes the sentence?

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

Answer: (A)

The essential idea is that a smoke detector’s listed performance focuses on how readily it detects smoke, which is described by its sensitivity and the tolerance around that value. The nominal sensitivity tells you the typical amount of smoke (how much obscuration or concentration) needed to trigger the alarm, and the tolerance indicates how much that sensitivity may vary from unit to unit due to manufacturing. This pairing ensures the device will respond reliably within a known range, supporting proper detection while avoiding excessive false alarms. Voltage, temperature, and color aren’t the same kind of performance markers: voltage is an electrical supply detail, temperature is an environmental rating, and color is cosmetic. Marking nominal sensitivity and its tolerance gives installers and inspectors a concrete basis to verify the device meets its listed performance.

The essential idea is that a smoke detector’s listed performance focuses on how readily it detects smoke, which is described by its sensitivity and the tolerance around that value. The nominal sensitivity tells you the typical amount of smoke (how much obscuration or concentration) needed to trigger the alarm, and the tolerance indicates how much that sensitivity may vary from unit to unit due to manufacturing. This pairing ensures the device will respond reliably within a known range, supporting proper detection while avoiding excessive false alarms. Voltage, temperature, and color aren’t the same kind of performance markers: voltage is an electrical supply detail, temperature is an environmental rating, and color is cosmetic. Marking nominal sensitivity and its tolerance gives installers and inspectors a concrete basis to verify the device meets its listed performance.