Question 41General Subjects - 1st Asst/Chief

The correct answer is D) superheated steam. When the steam passes through the low pressure evaporator steam control orifice in the live steam supply line, the rapid expansion of the steam leads to a decrease in pressure and temperature. This causes the steam to become superheated, meaning it has a temperature higher than the saturation temperature corresponding to its pressure. The other options are incorrect because: A) Poor quality steam would not be the result of passing through the orifice. B) Desuperheated steam has a temperature equal to the saturation temperature, which is not the case here. C) Saturated steam has a temperature equal to the saturation temperature, but the rapid expansion through the orifice results in superheated steam.