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Oxides of nitrogen in the engine exhaust can be reduced by which of the following methods?
1. Decrease in compression ratio
2. Exhaust gas recirculation
3. Use of 5% lean mixture
4. Use of oxidation catalysts in exhaust manifold
Select the correct answer using the code given below:   
  • a)
    1 and 2 only
  • b)
    1 and 3 only
  • c)
    1, 2 and 4
  • d)
    2 and 4 only
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
Oxides of nitrogen in the engine exhaust can be reduced by which of th...
Ans. (c) Decrease in compression ratio will decrease the temperature therefore decrease NOx emission.
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Oxides of nitrogen in the engine exhaust can be reduced by which of the following methods?1. Decrease in compression ratio2. Exhaust gas recirculation3. Use of 5% lean mixture4. Use of oxidation catalysts in exhaust manifoldSelect the correct answer using the code given below: a)1 and 2 onlyb)1 and 3 onlyc)1, 2 and 4d)2 and 4 onlyCorrect answer is option 'C'. Can you explain this answer?
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