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For CI engines, fuels most preferred are
- a)Naphthalene
- b)Paraffins
- c)Olefins
- d)Aromatics
Correct answer is option 'B'. Can you explain this answer?
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For CI engines, fuels most preferred area)Naphthaleneb)Paraffinsc)Olef...
For CI engines, the normal paraffin’s are the best fuels and aromatics are the least desirable.
For SI engines the aromatics are the best fuel and the paraffins are least desirable.
The reason for this is normal paraffins exhibit the poorest antiknock quality when used in SI engines. But the antiknock quality improves with the increasing number of carbon atoms and the compactness of the molecular structure. The aromatics offer the best resistance to knocking in SI Engines.
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For CI engines, fuels most preferred area)Naphthaleneb)Paraffinsc)Olef...
Fuels Preferred for CI Engines
In compression ignition (CI) engines, the fuel is ignited by the heat generated from the compression of the air-fuel mixture. The choice of fuel plays a crucial role in the performance and efficiency of these engines. Among the various options available, paraffins are the most preferred fuels for CI engines.
Paraffins, also known as alkanes, are a class of hydrocarbons with a straight or branched chain structure. They have several characteristics that make them suitable for use in CI engines:
- Ignition Quality: Paraffins have a high cetane number, which is a measure of their ignition quality. A higher cetane number indicates better ignition characteristics, resulting in improved combustion and reduced emissions. Paraffins typically have higher cetane numbers compared to other fuel options.
- Combustion Efficiency: Paraffins have a higher energy content per unit volume compared to other hydrocarbons. This results in better combustion efficiency and higher power output in CI engines. The high energy content of paraffins ensures that a greater amount of energy is released during the combustion process.
- Low Sulfur Content: Paraffins have a low sulfur content, which is beneficial in terms of reducing emissions. Sulfur in fuel can lead to the formation of sulfur oxides (SOx) during combustion, which are harmful pollutants. Low sulfur content in paraffins helps in meeting emission regulations.
- Availability: Paraffins are abundantly available in crude oil and can be easily refined. This makes them a cost-effective fuel option for CI engines. The widespread availability of paraffins ensures a steady supply and reduces dependency on other fuel sources.
- Stability: Paraffins have good stability and resistance to oxidation. They can withstand high pressures and temperatures encountered in CI engines without undergoing significant chemical changes. This stability ensures smooth and reliable engine operation.
In conclusion, paraffins are the most preferred fuels for CI engines due to their high ignition quality, combustion efficiency, low sulfur content, availability, and stability. These characteristics make paraffins an ideal choice for achieving improved performance, reduced emissions, and cost-effectiveness in compression ignition engines.
Introduction
In compression ignition (CI) engines, the fuel is ignited by the heat generated from the compression of the air-fuel mixture. The choice of fuel plays a crucial role in the performance and efficiency of these engines. Among the various options available, paraffins are the most preferred fuels for CI engines.
Why Paraffins are Preferred?
Paraffins, also known as alkanes, are a class of hydrocarbons with a straight or branched chain structure. They have several characteristics that make them suitable for use in CI engines:
- Ignition Quality: Paraffins have a high cetane number, which is a measure of their ignition quality. A higher cetane number indicates better ignition characteristics, resulting in improved combustion and reduced emissions. Paraffins typically have higher cetane numbers compared to other fuel options.
- Combustion Efficiency: Paraffins have a higher energy content per unit volume compared to other hydrocarbons. This results in better combustion efficiency and higher power output in CI engines. The high energy content of paraffins ensures that a greater amount of energy is released during the combustion process.
- Low Sulfur Content: Paraffins have a low sulfur content, which is beneficial in terms of reducing emissions. Sulfur in fuel can lead to the formation of sulfur oxides (SOx) during combustion, which are harmful pollutants. Low sulfur content in paraffins helps in meeting emission regulations.
- Availability: Paraffins are abundantly available in crude oil and can be easily refined. This makes them a cost-effective fuel option for CI engines. The widespread availability of paraffins ensures a steady supply and reduces dependency on other fuel sources.
- Stability: Paraffins have good stability and resistance to oxidation. They can withstand high pressures and temperatures encountered in CI engines without undergoing significant chemical changes. This stability ensures smooth and reliable engine operation.
Conclusion
In conclusion, paraffins are the most preferred fuels for CI engines due to their high ignition quality, combustion efficiency, low sulfur content, availability, and stability. These characteristics make paraffins an ideal choice for achieving improved performance, reduced emissions, and cost-effectiveness in compression ignition engines.
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For CI engines, fuels most preferred area)Naphthaleneb)Paraffinsc)Olefinsd)AromaticsCorrect answer is option 'B'. Can you explain this answer?
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