Question 220General Subjects - 1st Asst/Chief70% to pass
Referring to the illustrated psychrometric chart, under what conditions are the dry bulb, wet bulb, and dew point temperatures for air all equal in value? Illustration GS-RA-22
AI Explanation
The correct answer is C) When the air is completely saturated with moisture and the relative humidity is 100%.
This is correct because when the air is completely saturated with moisture, the relative humidity is 100%, and the dry bulb, wet bulb, and dew point temperatures are all equal. In this situation, the air cannot hold any more moisture, so the temperatures measured by the dry bulb, wet bulb, and dew point thermometers will be the same.
The other options are incorrect because A) a relative humidity of 0% would mean the air is completely dry, not saturated, B) it is possible for the three temperatures to be equal under the right conditions, and D) zero grains of moisture per pound of dry air would also mean the air is completely dry, not saturated.
Related Questions
#217 Referring to the illustrated single zone HVAC system diagram, what statement is true concerning the damper controls? Illustration GS-RA-09#219 In the illustrated single zone HVAC system, what prevents the simultaneous flow of steam through the preheat coil and flow of chilled water through the cooling coil? Illustration GS-RA-09 #221 Referring to the illustrated psychrometric chart, suppose during the cooling season that air passes over a cooling coil with a mean surface temperature above the dew point temperature, and this results in sensible heat loss with no change in moisture content. What statement represents the direction of the air conditioning process line? Illustration GS-RA-22 #222 Referring to the illustrated psychrometric chart, if the dry bulb temperature is 70oF and the relative humidity is 40%, what is the absolute humidity? Illustration GS-RA-22 #223 What temperature associated with the psychrometric properties of air is measured by an ordinary thermometer?