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Auto- ignition time for petrol-air mixture is minimum when the ratio of actual fuel-air ratio and chemically correct fuel-air ratio is
- a)0.8
- b)1.0
- c)1.2
- d)1.5
Correct answer is option 'C'. Can you explain this answer?
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Auto-Ignition Time for Petrol-Air Mixture
Auto-ignition time is the time required for the fuel-air mixture to ignite on its own without the need for a spark or any other external ignition source. This time can be affected by several factors, including the fuel-air ratio.
Chemically Correct Fuel-Air Ratio
The chemically correct fuel-air ratio is the theoretical ratio of fuel and air that would produce complete combustion without any excess fuel or air. For petrol, the chemically correct fuel-air ratio is about 14.7:1.
Actual Fuel-Air Ratio
The actual fuel-air ratio is the ratio of fuel and air that is present in the combustion chamber during operation. This ratio can be affected by several factors, including the fuel injection system, the air intake system, and the engine load.
Minimum Auto-Ignition Time
The minimum auto-ignition time occurs when the actual fuel-air ratio is slightly higher than the chemically correct fuel-air ratio. This is because a slightly richer mixture will ignite more easily and burn more completely, resulting in a shorter auto-ignition time.
Ratio of Actual Fuel-Air Ratio to Chemically Correct Fuel-Air Ratio
The ratio of actual fuel-air ratio to chemically correct fuel-air ratio is a measure of how rich or lean the mixture is relative to the theoretical ideal. A ratio of 1.0 indicates that the mixture is at the chemically correct ratio, while a ratio greater than 1.0 indicates a richer mixture and a ratio less than 1.0 indicates a leaner mixture.
Therefore, the correct answer is option C, 1.2, which indicates that the actual fuel-air ratio is slightly richer than the chemically correct ratio, resulting in a minimum auto-ignition time.
Auto-ignition time is the time required for the fuel-air mixture to ignite on its own without the need for a spark or any other external ignition source. This time can be affected by several factors, including the fuel-air ratio.
Chemically Correct Fuel-Air Ratio
The chemically correct fuel-air ratio is the theoretical ratio of fuel and air that would produce complete combustion without any excess fuel or air. For petrol, the chemically correct fuel-air ratio is about 14.7:1.
Actual Fuel-Air Ratio
The actual fuel-air ratio is the ratio of fuel and air that is present in the combustion chamber during operation. This ratio can be affected by several factors, including the fuel injection system, the air intake system, and the engine load.
Minimum Auto-Ignition Time
The minimum auto-ignition time occurs when the actual fuel-air ratio is slightly higher than the chemically correct fuel-air ratio. This is because a slightly richer mixture will ignite more easily and burn more completely, resulting in a shorter auto-ignition time.
Ratio of Actual Fuel-Air Ratio to Chemically Correct Fuel-Air Ratio
The ratio of actual fuel-air ratio to chemically correct fuel-air ratio is a measure of how rich or lean the mixture is relative to the theoretical ideal. A ratio of 1.0 indicates that the mixture is at the chemically correct ratio, while a ratio greater than 1.0 indicates a richer mixture and a ratio less than 1.0 indicates a leaner mixture.
Therefore, the correct answer is option C, 1.2, which indicates that the actual fuel-air ratio is slightly richer than the chemically correct ratio, resulting in a minimum auto-ignition time.
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Auto- ignition time for petrol-air mixture is minimum when the ratio of actual fuel-air ratio and chemically correct fuel-air ratio isa)0.8b)1.0c)1.2d)1.5Correct answer is option 'C'. Can you explain this answer?
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