NivaarExam PrepOfficial exam papers ↗

23-Chem-A3 Heat and Mass Transfer: May 2016

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

  1. Question 1 Diffusivity by the falling-level (Winkelmann) method
  2. Question 2 Fall time of an acetone / dibutyl-phthalate level
  3. Question 3 Non-equimolar diffusion in a distillation vapour film
  4. Question 4 Effective gas-film thickness; water then ethanol
  5. Question 5 Benzene / toluene distillation (McCabe–Thiele)
  6. Question 6 Steam stripping of a paraffin (number of stages)
  7. Question 7 Adsorption of acetone vapour on activated carbon

Start with Question 1 →

Paper format. EGBC 04-CHEM-A3 Mass Transfer Operations, May 2016 — three-hour open-book exam. Seven questions in three parts: Part A (Q1–2, molecular diffusion), Part B (Q3–4, film mass transfer), Part C (Q5–7, staged and equilibrium separations). The candidate answers one of Q1–2, one of Q3–4 and two of Q5–7 (four questions of equal value). All seven are worked in full below.

Reference texts. J.M. Coulson & J.F. Richardson, Chemical Engineering Vol. 1 (Fluid Flow, Heat and Mass Transfer) and Vol. 2 (Particle Technology & Separation Processes) — the source of all seven problems; C.J. Geankoplis, Transport Processes and Separation Process Principles; R.E. Treybal, Mass-Transfer Operations; Bird, Stewart & Lightfoot, Transport Phenomena; Perry’s Chemical Engineers’ Handbook.