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22-Agric-B8 Food Process Engineering (Part 1): May 2017

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

  1. Question 1 Chilling honeydew melons before shipping
  2. Question 2 Steam-pipe heat loss and the payback of adding insulation
  3. Question 3 Sizing a counter-current double-pipe heat exchanger
  4. Question 4 Air-blast freezing time of a partially frozen ice-cream brick
  5. Question 5 Scaling freezing time with product size, air velocity, and medium temperature
  6. Question 6 F-value for a target spoilage rate, and the Ball formula process time
  7. Question 7 F-value by the graphical (General) method
  8. Question 8 Forward-feed double-effect evaporator — required steam pressure
  9. Question 9 Steam economy of a double-effect evaporator with two feed preheaters
  10. Question 10 Single-effect evaporator — rating at two different feed rates

Start with Question 1 →

04-Agric-B8, Food Process Engineering (Part 1) — National Exams, May 2017. 3 hours duration, closed book (one aid sheet permitted). Ten questions are printed, grouped into four sections (I–IV); a complete exam paper requires six. All ten are solved below as a complete study set.

Reference texts: Toledo, R.T., Fundamentals of Food Process Engineering (this exam's own cited source for its Stumbo g-table and steam-table appendix); Geankoplis, C.J., Transport Processes and Separation Process Principles (evaporator design and steam economy); Incropera, F.P. & DeWitt, D.P., Fundamentals of Heat and Mass Transfer (unsteady-state Heisler-chart conduction, composite cylindrical walls); Singh, R.P. & Heldman, D.R., Introduction to Food Engineering, and Cleland, A.C., Food Refrigeration Processes (freezing-time prediction, modified Plank equation).