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Difficulty: EasyFuel and Air Intake Systems

When an internal combustion engine receives an air-fuel mixture containing an excess amount of fuel relative to the available air, what type of mixture is it operating on?

  1. A
    Lean mixture
  2. Rich mixtureAnswer
  3. C
    Stoichiometric mixture
  4. D
    Scavenged mixture

Answer

The condition where an engine receives an excess amount of fuel relative to air is known as a rich mixture.
In automotive fuel and air intake systems, a mixture with a higher concentration of fuel than the ideal chemical ratio is termed 'rich'. Running rich can lead to unburned fuel, reduced fuel economy, and black exhaust smoke.

Step-by-Step Solution

1
Analyze the air-to-fuel proportion stated in the prompt.
The engine is supplied with more fuel than the standard balanced proportion required for combustion.
Air-fuel mixtures are classified based on the balance between air mass and fuel mass.
2
Differentiate between the standard mixture classifications.
Excess air produces a lean mixture, balanced air-fuel is stoichiometric, and excess fuel produces a rich mixture.
Identifying the defined term confirms that excess fuel corresponds specifically to running rich.

Key Concept

Air-fuel mixture classifications (rich versus lean)
Estimated Time:40s
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Topics

Fuel and Air Intake Systems

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