Q3. A. With reference to the underwater surface of a ship’s hull; i. Describe a hull plate roughness analyser system;
ii. State the significance of the roughness profile and compare the typical roughness values for a new ship and a ship eight years old;
B. Which reference to the application of self-polishing paint in dry dock - i. Describe the plate preparation necessary;
ii. State the defects that may occur in the paint coating if it is not correctly applied.
Q5: With reference to fatigue of engineering components explain the influence of stress level and cyclical frequency on expected operating life;
A. Explain the influence of material defects on the safe operating life of an engineering component;
B. State the factors which influence the possibility of fatigue cracking of a bed-plate transverse girder and explain how the risk of such cracking can be minimized.
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