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22-Mec-A1 Applied Thermodynamics and Heat Transfer: December 2017

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

  1. Question 1 Water in a piston–cylinder resting on stops
  2. Question 2 Flash chamber feeding a steam turbine
  3. Question 3 Refrigerant selection: ammonia vs. R-134a
  4. Question 4 Reciprocating compressor volumetric efficiency
  5. Question 5 Insulation thickness to stop a pipe freezing
  6. Question 6 Length of a water tube cooled by cross-flowing air
  7. Question 7 Surface temperature of a natural-convection heating panel
  8. Question 8 Number of parallel tubes in a steam-heated exchanger

Start with Question 1 →

Paper format: National Examination 16-Mec-A1, 3 hours, open book. Eight questions of equal value: Part A — Thermodynamics (Q1–Q4) and Part B — Heat Transfer (Q5–Q8). A complete paper is any five questions (three from one part and two from the other).

Reference texts: Çengel & Boles, Thermodynamics: An Engineering Approach (9th ed., McGraw-Hill) — closed-system energy balances, wet-region steam properties, flash/separator processes, isentropic turbine and compressor efficiency, vapour-compression refrigeration, and reciprocating-compressor clearance analysis; Çengel & Ghajar, Heat and Mass Transfer (6th ed.) and Incropera, DeWitt, Bergman & Lavine, Fundamentals of Heat and Mass Transfer (8th ed., Wiley) — transient lumped-capacitance cooling, radial composite-cylinder conduction, internal-flow and external cross-flow convection, natural convection from a vertical plate, and the LMTD method for condensers. Water/steam and air properties are taken from standard tables (IAPWS-consistent); ammonia and R-134a properties are read from the saturation and superheat tables appended to the examination paper.