Final answer:
The instrument air system shall activate an alarm when the dew point at system pressure exceeds -24 degrees Fahrenheit.
The answer is option ⇒c
Step-by-step explanation:
The dew point is the temperature at which water vapor begins to condense out of the air when the air is saturated with moisture. To activate an alarm system, the dew point at system pressure needs to exceed a certain value in degrees Fahrenheit.
According to the given options, the instrument air system shall activate an alarm when the dew point at system pressure exceeds -24 degrees Fahrenheit (Option C).
The answer is option ⇒c