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Answer :
Final answer:
All options provided, including EGR, PCV, EVAP, and air injection, are types of common emission control systems used in vehicles to minimize noxious gases. However, air injection is less common in newer models due to advancements in automotive technology. (option c)
Explanation:
EGR (Exhaust Gas Recirculation), PCV (Positive Crankcase Ventilation), and EVAP (Evaporative Emission Control System) are all standard emission control systems found in vehicles.
These systems help minimize the release of noxious gases into the environment, improving air quality. The EGR system reduces nitrogen oxides by recirculating a portion of an engine's exhaust gas back to the engine cylinders, the PCV system handles the engine's crankcase emissions, and the EVAP system prevents gasoline vapors from leaving the fuel system and entering the atmosphere.
Air Injection, listed as an option, is indeed part of common emission control systems found in vehicles, primarily older or classic models. It injects fresh air into the exhaust system to help in the complete combustion of unburned hydrocarbons. However, with advancements in automotive technology, more efficient systems have largely phased out air injection in newer models.
In summary, all options listed: EGR, PCV, EVAP, and air injection are types of common emission control systems, although air injection is less commonly found in modern vehicles due to technological advancements.
Hence, the answer is option c.
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Final answer:
All of the emission control systems listed (EGR, PCV, EVAP, Air Injection) are commonly used in modern vehicles to reduce pollution. The question may contain an error as each option provided is a recognized emission control system.
Explanation:
The emission control system in a vehicle is an integral part of its design, which helps reduce pollution. In the question mentioned, we need to identify which among the given options is not a common emission control system. The options provided are:
- EGR (Exhaust Gas Recirculation)
- PCV (Positive Crankcase Ventilation)
- EVAP (Evaporative Emission Control System)
- Air Injection
Each of these is a common emission control system used in vehicles, so it seems there might be an error in the question if it is asking to identify a non-existent or uncommon system. Here's what each one does:
- EGR: Reduces nitrogen oxide emissions by recirculating a portion of the engine's exhaust gas back to the engine cylinders.
- PCV: Controls the circulation of crankcase fumes into the intake manifold instead of releasing them into the atmosphere.
- EVAP: Captures fuel vapors from the fuel system and stores them in a charcoal canister until they can be reintroduced into the combustion process.
- Air Injection: Injects fresh air into the exhaust stream to help burn off hydrocarbons and carbon monoxide.
Upon reviewing these systems, we can conclude that all of them are indeed common emission control systems used in modern vehicles.
