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23-Chem-A2 Unit Operations and Separation Processes: May 2016

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

  1. Question 1 Affinity-Law Scale-Up of a Centrifugal Pump
  2. Question 2 Terminal Velocity and Equal-Bed-Density Fluidization
  3. Question 3 Constant-Pressure Plate-and-Frame Filtration
  4. Question 4 Cooling Crystallization of Glauber's Salt
  5. Question 5 Single-Effect Caustic-Soda Evaporator Area
  6. Question 6 Additional Magnesia Insulation on a Hot Pipe

Start with Question 1 →

Paper format. National Exams — 04-CHEM-A2 Mechanical and Thermal Operations, May 2016. 3 hours, open book. Six problems (Section A Mechanical Operations: A1–A3; Section B Thermal Operations: B1–B3), each 25 marks; candidates attempt at least two from each section (only the first two per section are marked). All six are worked below for completeness.

Reference texts. Coulson & Richardson, Chemical Engineering Vol. 2 (particle technology, sedimentation, fluidization, filtration, crystallization, evaporation) and Vol. 1 (heat transfer); McCabe, Smith & Harriott, Unit Operations of Chemical Engineering (7th ed.); Geankoplis, Transport Processes and Separation Process Principles (4th ed.); Incropera & DeWitt, Fundamentals of Heat and Mass Transfer (8th ed.); Perry's Chemical Engineers' Handbook (9th ed.).

Note on saturation data. Sections B2 and B3 need water saturation temperatures and latent heats that the exam expects from an open-book steam table. These are taken from standard tables (and, for reproducibility). The B1 latent heat of evaporation is not printed in the exam and is taken as 2370 kJ/kg at the cooling range; this and other engineering choices are flagged in Check callouts.