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25-Nav-B5 Marine Control Systems: December 2017

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

  1. Question 1 Hydro Turbines
  2. Question 2 Hydro Turbine Model
  3. Question 3 Curtis Type Impulse Turbine
  4. Question 4 Pump Design
  5. Question 5 Compressor First Stage
  6. Question 6 Turbine Blade Characteristics
  7. Question 7 Gas Turbine Number of Stages
  8. Question 8 Pump Characteristics

Start with Question 1 →

Paper format. 98-Mar-B5 Fluid Machinery, National Examinations December 2017 — three hours, closed book. Section A is calculative (Questions 1–5) and Section B descriptive (Questions 6–8); the rubric asks for four of Section A and two of Section B, six questions of ten marks each for a sixty-mark paper. Reference data for individual questions are supplied as Attachments (pages 10–17) and a general nomenclature/constants/equations sheet occupies pages 18–22. All eight questions are solved here, because the set is a study resource rather than a timed attempt.

Reference texts. S. L. Dixon & C. A. Hall, Fluid Mechanics and Thermodynamics of Turbomachinery, 7th ed.; R. K. Turton, Principles of Turbomachinery, 2nd ed.; H. Cohen, G. F. C. Rogers & H. I. H. Saravanamuttoo, Gas Turbine Theory, 6th ed.; F. M. White, Fluid Mechanics, 8th ed.; R. W. Fox, A. T. McDonald & P. J. Pritchard, Introduction to Fluid Mechanics, 9th ed.; Y. A. Çengel & M. A. Boles, Thermodynamics: An Engineering Approach, 9th ed. Constants are those printed on page 19 of the paper (g = 9.81 m/s², ρwater = 1000 kg/m³, ρair = 1.21 kg/m³ at 15 °C and 1.19 kg/m³ at 20 °C, cp = 1.005 kJ/kg°C, cv = 0.718 kJ/kg°C, patm = 100 kPa, pvapour = 1.71 kPa at 15 °C). Every reference equation quoted below is one of those printed on pages 20–22, and is identified as such where it is first used.

Subject note. Although this paper is listed under “Marine Control Systems”, page 1 of the examination itself reads 98-MAR-B5, FLUID MACHINERY, and every question is a turbomachine question with zero marine-control-systems content. The solutions below answer the paper as printed, citing turbomachinery texts rather than any control-systems reference. The three Canadian hydro stations named in Questions 1 and 2 (Mactaquac, Churchill Falls) are used by the examiner as settings for stated “hypothetical measurements”; the numbers solved here are the paper's, not plant records.