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The two reference fuels used for cetane rating are
- a)cetance and iso-octane
- b)cetane and tetraethyl lead
- c)cetane and n-heptane
- d)cetane and a-methyl naphthalene
Correct answer is option 'D'. Can you explain this answer?
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The two reference fuels used for cetane rating area)cetance and iso-oc...
Cetane and alpha-methyl naphthalene are the reference fuels taken for cetane rating. option (d) is correct.
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The two reference fuels used for cetane rating area)cetance and iso-oc...
Introduction:
Cetane rating is a measure of the ignition quality of diesel fuel. It indicates how well a fuel ignites under compression in a diesel engine. To determine the cetane rating of a fuel, it is compared to two reference fuels: cetane and alpha-methyl naphthalene. Out of these two reference fuels, cetane and alpha-methyl naphthalene, cetane is the most commonly used reference fuel for cetane rating.
Explanation:
The correct answer is option 'D' which states that the two reference fuels used for cetane rating are cetane and alpha-methyl naphthalene.
1. Cetane:
Cetane, also known as n-hexadecane, is a straight-chain hydrocarbon with 16 carbon atoms. It has excellent ignition quality and is assigned a cetane rating of 100. This means that cetane fuel ignites very easily under compression in a diesel engine. It serves as the reference fuel with the highest cetane rating.
2. Alpha-Methyl Naphthalene:
Alpha-methyl naphthalene is an aromatic hydrocarbon with a chemical formula of C12H10. It has a cetane rating of zero, indicating poor ignition quality. It serves as the reference fuel with the lowest cetane rating.
3. Cetane Rating:
The cetane rating of a fuel is determined by comparing its ignition delay with that of the reference fuels. Ignition delay is the time interval between the start of fuel injection and the start of combustion in a diesel engine. A fuel with a higher cetane rating will have a shorter ignition delay and will ignite more easily.
4. Significance of Cetane Rating:
The cetane rating of a diesel fuel is important because it affects engine performance and emissions. Fuels with higher cetane ratings result in shorter ignition delays, more complete combustion, smoother engine operation, and lower emissions of pollutants such as nitrogen oxides (NOx) and particulate matter (PM).
5. Other Reference Fuels:
While cetane and alpha-methyl naphthalene are the most commonly used reference fuels for cetane rating, other fuels such as iso-octane and n-heptane are used for research and octane rating. These fuels have different properties and are used to determine the octane rating of gasoline.
In conclusion, the two reference fuels used for cetane rating are cetane and alpha-methyl naphthalene. Cetane has a cetane rating of 100, while alpha-methyl naphthalene has a cetane rating of zero. These reference fuels are used to compare the ignition quality of diesel fuels and determine their cetane ratings.
Cetane rating is a measure of the ignition quality of diesel fuel. It indicates how well a fuel ignites under compression in a diesel engine. To determine the cetane rating of a fuel, it is compared to two reference fuels: cetane and alpha-methyl naphthalene. Out of these two reference fuels, cetane and alpha-methyl naphthalene, cetane is the most commonly used reference fuel for cetane rating.
Explanation:
The correct answer is option 'D' which states that the two reference fuels used for cetane rating are cetane and alpha-methyl naphthalene.
1. Cetane:
Cetane, also known as n-hexadecane, is a straight-chain hydrocarbon with 16 carbon atoms. It has excellent ignition quality and is assigned a cetane rating of 100. This means that cetane fuel ignites very easily under compression in a diesel engine. It serves as the reference fuel with the highest cetane rating.
2. Alpha-Methyl Naphthalene:
Alpha-methyl naphthalene is an aromatic hydrocarbon with a chemical formula of C12H10. It has a cetane rating of zero, indicating poor ignition quality. It serves as the reference fuel with the lowest cetane rating.
3. Cetane Rating:
The cetane rating of a fuel is determined by comparing its ignition delay with that of the reference fuels. Ignition delay is the time interval between the start of fuel injection and the start of combustion in a diesel engine. A fuel with a higher cetane rating will have a shorter ignition delay and will ignite more easily.
4. Significance of Cetane Rating:
The cetane rating of a diesel fuel is important because it affects engine performance and emissions. Fuels with higher cetane ratings result in shorter ignition delays, more complete combustion, smoother engine operation, and lower emissions of pollutants such as nitrogen oxides (NOx) and particulate matter (PM).
5. Other Reference Fuels:
While cetane and alpha-methyl naphthalene are the most commonly used reference fuels for cetane rating, other fuels such as iso-octane and n-heptane are used for research and octane rating. These fuels have different properties and are used to determine the octane rating of gasoline.
In conclusion, the two reference fuels used for cetane rating are cetane and alpha-methyl naphthalene. Cetane has a cetane rating of 100, while alpha-methyl naphthalene has a cetane rating of zero. These reference fuels are used to compare the ignition quality of diesel fuels and determine their cetane ratings.
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The two reference fuels used for cetane rating area)cetance and iso-oc...
Time required for ignition and combustion of fuel.... that why two different fuel's are used.
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The two reference fuels used for cetane rating area)cetance and iso-octaneb)cetane and tetraethyl leadc)cetane and n-heptaned)cetane and a-methyl naphthaleneCorrect answer is option 'D'. Can you explain this answer?
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