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04-BS-10: May 2014

Nivaar worked solution (AI-drafted; not reviewed by a licensed engineer)

  1. Question 1 Ideal Regenerative Rankine Cycle — Closed + Open Feedwater Heaters, with Second-Law Efficiency
  2. Question 2 Ideal Regenerative Gas-Turbine Cycle — Two-Stage Intercooled Compression, Two-Stage Reheated Expansion
  3. Question 3 Two-Stage Compression Refrigeration with Flash Chamber (R-134a) — Evaporator Flow from Given Condenser Flow
  4. Question 4 Air-Standard Dual Cycle, Variable Specific Heats
  5. Question 5 Fixed-Composition O₂/N₂ Ideal-Gas Mixture, Constant-Pressure Heating
  6. Question 6 Moist Air in a Closed Rigid Vessel — Heating at Constant Humidity Ratio & Volume
  7. Question 7 Insulated Steam Turbine — Isentropic Efficiency from Given Actual Work
  8. Question 8 Two-Phase H₂O, Polytropic ($Pv=\text{const}$) Expansion
  9. Question 9 Insulated Vessel with Evacuated Compartment — Free Expansion of Steam

Start with Question 1 →

National Exam 04-BS-10, Thermodynamics — May 2014. 3 hours, Closed-Book Exam (approved calculator and one double-sided 8.5x11-inch aid sheet permitted; property tables and charts supplied in an appendix). Part A: answer 2 of Questions 1-3 (20 marks each). Part B: answer 4 of Questions 4-9 (15 marks each), for a 100-mark paper. Only the first two Part-A and first four Part-B questions as they appear in the answer book are marked. All nine questions (Part A complete, Part B complete) are solved below for completeness.

Reference texts: Cengel & Boles, Thermodynamics: An Engineering Approach, 8th ed.; Moran, Shapiro, Boettner & Bailey, Fundamentals of Engineering Thermodynamics, 8th ed. All state properties (R-134a, water/steam, moist air, N₂, O₂, air) were computed from high-accuracy equations of state in place of printed property-table interpolation; every boxed numeric result.