Tag: #selectivecatalyticreduction
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EK Motor Oct 2024 (Q5)
(a) Describe, with the aid of a sketch, a diesel engine NOx reduction system using chemical supply, explaining the safety and pollution avoidance systems required. (12) (b) Explain chemical reactions involved in the NOx reduction system described in part (a) of the question. (4) Oct 2024 (Q5)
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EK Motor Jul 2024 (Q3)
(a) Explain why highly efficient diesel engines tend to produce more NOx than low performance diesel engine (4) (b) Describe, with the aid of a sketch, a Selective Catalytic Reduction (SCR) unit for a marine propulsion diesel engine (8) (c) Explain why accurate monitoring of the exhaust gas flows entering and leaving a selective catalytic…
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EK Motor Oct 2022 (Q8)
With reference to diesel engine NOx emissions: (a) explain how NOx is formed during operation of the engine, indicating why the aim of high engine efficiency increases the problem; (6) (b) describe ONE external means by which diesel engine NOx emissions may be reduced in order to meet current regulations. (10) Oct 2022 (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 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 Jul 2021 (Q9)
(a) Explain why highly efficient diesel engines tend to produce more NOx than low performance diesel engine (4) (b) Describe, with the aid of a sketch, a Selective Catalytic Reduction (SCR) unit for a marine propulsion diesel engine (8) (c) Explain why accurate monitoring of the exhaust gas flows entering and leaving a selective catalytic…
UKM Tuticorin 