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In a SI Engine, which one of the following is the correct order of the fuels with increasing detonation tendency?
- a)Paraffins, Olefins, Naphthenes, Aromatics
- b)Aromatics, Naphthenes, Paraffins, Olefins
- c)Naphthenes, Olefins, Aromatics, Paraffins
- d)Aromatics, Naphthenes, Olefins, Paraffins
Correct answer is option 'D'. Can you explain this answer?
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Detonation Tendency of Fuels in SI Engine
The detonation tendency of a fuel is defined as the ability of the fuel-air mixture to detonate or explode in the engine cylinder. It is an important factor in determining the knock resistance of the fuel. The order of fuels with increasing detonation tendency in a SI engine is as follows:
Aromatics, Naphthenes, Olefins, Paraffins
Explanation
Aromatics are hydrocarbons containing at least one benzene ring. They have a high octane rating and are less likely to detonate in the engine cylinder. On the other hand, paraffins are saturated hydrocarbons and have a low octane rating. They are more prone to detonation.
Naphthenes are cyclic hydrocarbons that have a medium octane rating. They can undergo detonation under certain conditions, but not as easily as paraffins.
Olefins are unsaturated hydrocarbons that have a low octane rating and are highly prone to detonation. They have a double bond in their molecular structure which makes them less stable and more reactive than other hydrocarbons.
Therefore, the correct order of fuels with increasing detonation tendency in a SI engine is Aromatics, Naphthenes, Olefins, Paraffins.
The detonation tendency of a fuel is defined as the ability of the fuel-air mixture to detonate or explode in the engine cylinder. It is an important factor in determining the knock resistance of the fuel. The order of fuels with increasing detonation tendency in a SI engine is as follows:
Aromatics, Naphthenes, Olefins, Paraffins
Explanation
Aromatics are hydrocarbons containing at least one benzene ring. They have a high octane rating and are less likely to detonate in the engine cylinder. On the other hand, paraffins are saturated hydrocarbons and have a low octane rating. They are more prone to detonation.
Naphthenes are cyclic hydrocarbons that have a medium octane rating. They can undergo detonation under certain conditions, but not as easily as paraffins.
Olefins are unsaturated hydrocarbons that have a low octane rating and are highly prone to detonation. They have a double bond in their molecular structure which makes them less stable and more reactive than other hydrocarbons.
Therefore, the correct order of fuels with increasing detonation tendency in a SI engine is Aromatics, Naphthenes, Olefins, Paraffins.
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In a SI Engine, which one of the following is the correct order of the fuels with increasing detonation tendency?a)Paraffins, Olefins, Naphthenes, Aromaticsb)Aromatics, Naphthenes, Paraffins, Olefinsc)Naphthenes, Olefins, Aromatics, Paraffinsd)Aromatics, Naphthenes, Olefins, ParaffinsCorrect answer is option 'D'. Can you explain this answer?
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