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04-BS-10: December 2019

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

  1. Question 1 Regenerative Rankine Cycle, One Closed Feedwater Heater
  2. Question 2 Brayton Cycle with Reheat
  3. Question 3 Two-Evaporator R-134a Refrigeration System
  4. Question 4 Ideal-Gas Refrigeration Cycle
  5. Question 5 Isentropic Compression of an N₂/CO₂ Gas Mixture
  6. Question 6 Air Dehumidifier
  7. Question 7 Non-Ideal Air-Standard Diesel Cycle
  8. Question 8 Non-Adiabatic Steam–Air Heat Exchanger
  9. Question 9 Heat Pump — Minimum Cost of Operation

Start with Question 1 →

National Examinations — December 2019, 04-BS-10, Thermodynamics. 3-hour closed-book exam (one 8.5×11 in. double-sided note sheet allowed); property tables/charts supplied, no interpolation required. Part A: two of three 20-mark questions; Part B: four of six 15-mark questions. Every question is answered in full.

Reference texts. Cengel & Boles, Thermodynamics: An Engineering Approach, 8th ed. (Vapor Power Cycles Ch. 10; Gas Power Cycles Ch. 9; Refrigeration Cycles Ch. 11; Gas Mixtures Ch. 13; Psychrometrics Ch. 14; Exergy Ch. 8).

Questions 1, 3, 4, 6, 9 are fully legible and solved as printed. Question 2's specific numbers (pressure ratio, reheat pressure, temperatures, efficiencies) were reconstructed from surviving fragments that match a well-known textbook archetype (see Q2's callout). Questions 5, 7 and 8 have genuinely blank gaps in the source with no fully-confirming fingerprint; clearly-labelled representative values are substituted so every question can still be solved in full (see each question's own check callout).