Q1.a) Describe the procedures and equipment used to ensure a ship’s NOx emissions comply with international standards. (8)
b) List and describe the key methods used on board ships to reduce NOx emissions. Discuss how each method functions to lower NOx levels in exhaust gases. (8)
Q7. (a) Describe, with the aid of a sketch, an external system for reducing engine NOx emissions, explaining the chemistry of the process (6)
(b) Explain why Urea is used in the Selective Catalytic Reduction process instead of ammonia. (5)
(c) Explain why the exhaust gas quality must be monitored before and after the Selective Catalytic Reduction unit, stating how such monitoring influences operation of the SCR unit (5)
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