Oxides of nitrogen in Petrol engine exhaust can be reduced by the following methods:
1. Use of 5% lean mixture
2. Advancing the spark timing
3. Recirculating a fraction of exhaust gas
4. Using an oxidation catalyst in the exhaust manifold
Which of the above statements is/are correct?
A. 1 and 2
B. 2 only
C. 3 and 4
D. 3 only
Answer: Option D
This Question Belongs to Automobile Engineering >> Air Pollution And Its Control In Automobile
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