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04-BS-10: May 2013

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

  1. Question 1 Two-Stage Compression Refrigeration with Flash Chamber (R-134a)
  2. Question 2 Regenerative Brayton Cycle — Variable Specific Heats and Exergy
  3. Question 3 Ideal Reheat Rankine Cycle — Turbine Work and Exergy Destruction
  4. Question 4 Air-Standard Dual Cycle with Non-Ideal Compression/Expansion
  5. Question 5 R-134a Heat Pump — Power Input and Comparison with Resistance Heating
  6. Question 6 Isentropic Compression of an N₂/CO₂ Ideal-Gas Mixture
  7. Question 7 Charging a Rigid Tank from a Supply Line (R-134a)
  8. Question 8 Entropy Change of an Ideal Gas Stirred at Constant Temperature
  9. Question 9 Isentropic Efficiency of an Air Turbine

Start with Question 1 →

National Exam 04-BS-10, Thermodynamics — May 2013. 3 hours, Closed-Book Exam (approved calculator and one double-sided 8.5x11-inch aid sheet permitted). 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. 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.