Question 61Steam Plants - Assistant Engineer

The correct answer is C) Steam drum. In a boiler system, the steam drum is where the steam and water separation occurs. The steam quality, which represents the percentage of pure steam in the steam-water mixture, is typically around 90% in the steam drum. This is because the steam drum is where the steam is separated from the water, resulting in a high-quality steam output. The other answer choices are incorrect because: A) The last pass of the superheater would have a steam quality close to 100%, as the superheater is designed to remove any remaining moisture from the steam. B) The superheater outlet would also have a steam quality close to 100%, as the superheater's purpose is to superheat the steam. D) The desuperheater outlet would have a steam quality less than 90%, as the desuperheater is used to reduce the temperature of the steam.