Which of the statements below is incorrect?
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Answer: D. With increase in the Mach number >0.6, the drag co-efficient decreases in case of compressible fluids
Explanation
The boiling point is defined as the temperature where liquid vapor pressure equals external pressure. The temperature at which a vapor is saturated depends on its partial pressure rather than boiling point alone. Equating vapor saturation temperature directly to boiling point represents a fundamental thermodynamic definition error. Saturated vapor partial pressure equals its equilibrium vapor pressure at a given system temperature. Superheated vapors exist at temperatures higher than their corresponding saturation temperatures at system pressure. Degree of superheat measures the temperature difference between existing vapor temperature and dew point.
Steam power plant engineering relies on precise distinctions between saturated and superheated vapor states. Distillation column design requires accurate thermodynamic data regarding vapor liquid phase equilibrium conditions. Air conditioning and refrigeration systems monitor superheat to ensure proper compressor operating safety. A vapor with partial pressure equaling equilibrium vapor pressure is correctly termed a saturated vapor. A vapor with partial pressure below equilibrium vapor pressure is correctly termed a superheated vapor. The difference between existing vapor temperature and saturation temperature is correctly called degree of superheat.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
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