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25-Nav-B2 Marine Engineering and Vibrations: May 2017

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

  1. Question 1 Propeller Shaft Diameter Design
  2. Question 2 Bearing Moments and Reactions on an Overhung Propeller Shaft
  3. Question 3 Centrifugal Pump Characteristics and a Firefighting System
  4. Question 4 Heat Exchanger Area – Parallel vs Counterflow
  5. Question 5 Shaft Alignment and Engine Balancing
  6. Question 6 Discussion – Gas Turbines, Propeller Blade Count, and Engine Pressures
  7. Question 7 First Torsional Natural Frequency by Holzer's Method

Start with Question 1 →

Paper format: National Exams, May 2017; closed book, 3 hours (Casio/Sharp approved calculator only); seven numbered problems of equal value (20 marks each), of which any five constitute a complete paper (only the first five appearing in the answer book are marked). All seven are solved below so the set is complete for study.

Reference texts. Shigley, Shigley's Mechanical Engineering Design (11th) – fatigue & shaft design; ABS, Rules for Building and Classing Steel Vessels (2009) – propulsion shafting; Hibbeler, Structural Analysis (10th) – three-moment equation; Fox & McDonald, Introduction to Fluid Mechanics (10th) – pump & pipe systems; Incropera, Fundamentals of Heat and Mass Transfer (8th) – LMTD heat exchangers; Wilson & Sadler, Kinematics and Dynamics of Machinery (3rd) – reciprocating balance; Rao, Mechanical Vibrations (6th) – Holzer's method.