Tag: #chemicalreaction
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EK Motor Oct 2023 (Q4)
With reference to diesel engine NOx emissions and control: (a) Explain how exhaust gas recirculation and direct water injection reduce engine NOx emissions but result in increased specific CO2 emissions (6) (b) Describe, with the aid of a sketch, a Selective Catalytic Reduction system, stating with reasons, the monitoring and control system required (10) Oct…
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EK Motor Mar 2022 (Q3)
(a) Describe with the aid of a sketch, an external system for reducing engine NOx emissions, 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…
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EK Motor Mar 2019 (Q3)
With reference to a closed loop engine exhaust gas SOx scrubber system: (a) Describe, with the aid of a sketch, such a system. (8) (b) State, with reasons, the fluid which is used for SOx scrubbing in this system. (4) (c) State how the effectiveness of the scrubbing fluid is maintained and how the sludge…
UKM Tuticorin 