In Diesel engines, the control of black smoke in the exhaust can be achieved by:
1) Running the engine at lower load.
2) Maintaining the injection system perfect.
3) Using Diesel fuel of higher Cetane number.
Which of the above statements are correct?
1
1, 2 and 3
2
1 and 2 only
3
1 and 3 only
4
2 and 3 only
5
2 only