Question 478General Subjects - Assistant Engineer

The correct answer is B) 60%. Based on the given dry bulb temperature of 80°F and wet bulb temperature of 70°F, using the psychrometric chart (illustration GS-RA-22), the determined relative humidity is 60%. The psychrometric chart is a tool used to determine various properties of air, including relative humidity, based on the dry bulb and wet bulb temperatures. By locating the intersection of the 80°F dry bulb temperature and the 70°F wet bulb temperature on the chart, the corresponding relative humidity value is 60%. The other answer choices are incorrect because A) 45% is too low, C) 70% is too high, and D) 95% is significantly higher than the correct value determined from the psychrometric chart.