13. Explain, with the aid of a mid-ship half sectional sketch of a container ship, how strength is built into this type of vessel whilst still allowing access to the cargo holds. (10)
Q12. (a) Describe, with the aid of sketch, how a hydraulically operated folding hatch cover opens and closes. (7)
(b) Explain how the water tightness and security of the hatch cover sketched in part (a) can be ascertained before proceeding to sea. (3)
Q13. (a) Explain why fatigue cracks occur in a ship's hull, stating the locations where they may be found. (3)
(b) Describe the hull inspection that should be carried out m drydock to ascertain the maintenance and repairs that may need to be carried out. (7)
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