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04-BS-10: May 2015

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

  1. Question 1 Regenerative Rankine Cycle with One Closed Feedwater Heater
  2. Question 2 R-134a Heat Pump Driven by a Power Cycle
  3. Question 3 Regenerative Brayton Cycle — Exergy Destruction by Process
  4. Question 4 Isothermal Compression of Wet Steam in a Piston-Cylinder
  5. Question 5 Air Turbine — Power, Reversibility Check, Isentropic Efficiency
  6. Question 6 Water/Hot-Air Heat Exchanger
  7. Question 7 Isentropic Compression of an N 2 /CO 2 Ideal-Gas Mixture
  8. Question 8 Air-Standard Otto Cycle — Variable Specific Heats
  9. Question 9 Rigid Tank Charged from a Steam Supply Line

Start with Question 1 →

National Exam 04-BS-10, Thermodynamics — May 2015. 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, air, N₂, CO₂) were computed from high-accuracy equations of state in place of printed property-table interpolation; every boxed numeric result.