USCG Exam PracticeBoiler and steam propulsion fundamentals
Which of the following best describes 'superheated steam' as used in marine propulsion?
- A. Steam that contains suspended moisture with a quality less than 1.0
- B. Steam at the saturation temperature corresponding to its pressure, with liquid and vapor coexisting
- ✓ Steam that has been heated above its saturation temperature and contains no liquidCorrect
- D. Steam produced at atmospheric pressure by adding the latent heat of vaporization
Why C is correct
Superheated steam has been heated beyond the saturation temperature for its pressure and contains no liquid. It is preferred for turbines because it will not condense and erode the blades. Wet steam contains suspended moisture; saturated steam is the condition where liquid and vapor coexist. (DOE-HDBK-1012 §1-2)
Cited:DOE-HDBK-1012 §1-2