Tag: #exhaustgasrecirculation
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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 Jul 2023 (Q3)
With reference to marine diesel engine Selective Catalyst Reduction (SCR) (a) Explain, with the aid of a graph, the influence that fuel sulfur 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 unit when burning fuels with higher…
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EK Motor Mar 2023 (Q8)
(a) Explain, with the aid of sketch, the gas combustion process in a dual fuel medium speed main engine, operating with pilot injection (10) (b) Explain what is meant by exhaust gas recirculation and how this may be effective in reducing air pollution (6) Mar 2023 (Q8)
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EK Motor Jul 2022 (Q3)
(a) Describe, with the aid of a sketch, a Selective Catalytic NOx Reduction system, explaining the chemical reaction for reducing NOx and the control system requirements. (10) (b) State two engine based systems for reducing marine diesel engine NOx, explaining how they reduce NOx level but also increase fuel consumption and CO2 emissions. (6) Emission…
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EK Motor Mar 2018 (Q1)
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 (10) Mar 2018…
UKM Tuticorin 