1. Increasing the compression ratio. |
2. Increasing the intake air temperature. |
3. Increasing the length to diameter ratio of the cylinder. |
4. Increasing the engine speed. |
A) 1, 2 and 3
B) 1, 2 and 4
C) 1, 3 and 4
D) 2, 3 and 4
Correct Answer: B
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