Question:-
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:
Option (A)
1 and 2 only
Option (B)
1 and 3 only
Option(C)
1, 2 and 4
Option(D)
2 and 4 only
Correct Option:
(D)
question-answer-faq-9242