Q1. With regard to NOx control requirements of Annex VI:
(a) Explain Tier I, Tier II and Tier III requirements.
(b) Briefly explain NOx technical code and NOx Technical file. What entries are required to make in onboard NOx Technical file.
(c) The control of diesel engine NOx emissions is achieved by what means?
(d) Explain with a simple sketch any two systems for NOx emission reduction.
Q1. GHG Ratings of ships have become new industry norms-Discuss various types of GHG Ratings applied to international shipping, with special focus on the role of second engineers in improving GHG ratings of ships. (16)
Q6. a) Describe, with the aid of a sketch, an external system for reducing engine NOx emission, explaining the chemistry of the process. (8)
b) Explain why Urea is used in the selective catalytic reduction process instead of ammonia. (4)
(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. (4)
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