Question 246Steam Plants - Assistant Engineer

The correct answer is C) Superheated vapor. At a gage vacuum of 28.09 inches Hg and a temperature of 117.99 degrees Fahrenheit, the fluid would be in a superheated vapor state. This is because the given conditions place the fluid above the saturation line on a pressure-temperature diagram, indicating that the fluid is in a superheated state. The other options are incorrect because a gage vacuum of 28.09 inches Hg corresponds to a low pressure, which would not support a sub-cooled liquid (A) or a saturated liquid (B) state. Additionally, a temperature of 117.99 degrees Fahrenheit is too high for a mixture of saturated liquid and vapor (D) to exist at the given pressure.