Question 62Gas Turbine - Assistant Engineer

The correct answer is D) Both A and B. The "Standard Day" conditions, as defined by the International Organization for Standardization (ISO), are 29.92 in Hg (inches of mercury) at 15 degrees Celsius (A) and 14.69 psi (pounds per square inch) at 59 degrees Fahrenheit (B). These standard atmospheric conditions are used as a reference point for various engineering and operational applications, including in the context of the US Coast Guard Captain's License Examinations. The other options are incorrect because they do not accurately represent the ISO-defined "Standard Day" conditions. Option C) 14.69 in Hg at 59 degrees Celsius is not the correct standard, and Option A) and B) are the two correct elements that together define the "Standard Day" conditions.