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Q5. With reference to marine diesel engine selective catalytic reduction (SCR)

(a) Explain, with the aid of a graph, the influence that fuel sulphur content has on the operation of an SCR unit (4)

(b) Explain how the operation of a turbocharger system can have a detrimental effect on the unity when burning fuels with higher sulphur content (4)

(c) Describe, with the aid of a sketch, a system which maintains good engine performance of the turbocharger system and good NOx reduction when burning fuels with higher sulphur content, explaining how conflicting conditions are met (8)