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Which of the following are the assumptions involved in the auto-ignition theory put forth for the onset of knock in SI engines ? 1. Flame velocity is normal before the onset of auto-ignition. 2. A number of end-gas elements autoignite simultaneously. 3. Preflame reactions are responsible for preparing the end-gas to ignite. Select the correct answer using the codes given below : (a) 1 and 2 (b) 1 and 3 (c) 2 and 3 (d) 1, 2 and 3. |
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Answer» (d) 1, 2 and 3. |
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