At what rate does the alphanumeric display alternate between measured airflow and failure messages?

• A. One second intervals
• B. Two second intervals
• C. Half-second intervals
• D. Five second intervals

Answer: (A)

The display cycles every second, alternating between the measured airflow and any failure messages. This timing keeps the reading current while giving enough time to notice and read a failure alert. If it switched every two seconds, you’d have a slower reaction to changes or faults; half-second would flash too quickly to read; five seconds would delay recognizing problems too long.