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04-BS-10: December 2013

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

  1. Question 1 Two-Stage Compression Refrigeration with Flash Chamber & Direct-Contact Heat Exchanger (R-134a)
  2. Question 2 Ideal Regenerative Rankine Cycle — Closed + Open Feedwater Heaters
  3. Question 3 Regenerative Brayton Cycle — Constant Specific Heats
  4. Question 4 Air-Standard Diesel Cycle — Variable Specific Heats
  5. Question 5 Isentropic Compression of an N₂/CO₂ Ideal-Gas Mixture
  6. Question 6 Rigid Insulated Tank — Paddle-Wheel Work and Irreversibility
  7. Question 7 Adiabatic Mixing of Two Moist-Air Streams
  8. Question 8 Rigid Tank Venting Saturated Vapor at Constant Temperature
  9. Question 9 Carnot Heat Pump — House Heating

Start with Question 1 →

National Exam 04-BS-10, Thermodynamics — December 2013. 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, CO₂, air) were computed from high-accuracy equations of state in place of printed property-table interpolation; every boxed numeric result.