Gasoline Fuel Systems Quiz
48 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the primary function of the flyweights in an engine governor?

  • To ensure proper spark timing
  • To regulate the engine's speed by adjusting fuel flow (correct)
  • To increase the engine's power output
  • To control the amount of air entering the engine

    • How do flyweights affect the throttle valve in an engine governor?

  • As flyweights move inward, they close the throttle valve
  • As flyweights move outward, they close the throttle valve (correct)
  • Flyweights directly open the throttle valve
  • Flyweights have no impact on the throttle valve

    • What is the primary reason for the increasing use of electronic fuel injection (EFI) systems in agricultural equipment?

  • EFI systems are more reliable than carburetor systems in extreme weather conditions
  • EFI systems are less expensive to manufacture than carburetor systems
  • Government regulations and consumer demand for better fuel economy and reduced emissions have driven the adoption of EFI (correct)
  • EFI systems offer limited advantages over carburetor systems in terms of fuel efficiency

    • Which of the following is NOT an advantage of electronic fuel injection (EFI) systems over carburetor systems?

    <p>Increased engine noise levels</p> Signup and view all the answers

    How do electronic fuel injection (EFI) systems achieve precise air-fuel mixture control?

    <p>By using sensors to monitor engine conditions and adjust fuel delivery accordingly</p> Signup and view all the answers

    What component in electronic fuel injection (EFI) systems replaces the carburetor in traditional engines?

    <p>Injectors</p> Signup and view all the answers

    What is one of the key benefits of electronic fuel injection (EFI) systems in terms of environmental impact?

    <p>Generation of fewer harmful emissions</p> Signup and view all the answers

    In the context of engine governors, what happens when additional load is applied to the engine?

    <p>The flyweights move inward and open the throttle valve.</p> Signup and view all the answers

    What is the primary function of the choke valve in a carburetor?

    <p>To reduce air flow and provide a rich air/fuel mixture for cold starting.</p> Signup and view all the answers

    Which component ensures a constant fuel level within the carburetor bowl?

    <p>The float valve</p> Signup and view all the answers

    What is the primary purpose of the venturi in a carburetor?

    <p>To increase air speed and decrease air pressure, drawing fuel into the air stream.</p> Signup and view all the answers

    During engine idling, where is the vacuum primarily located, which allows fuel to be drawn for idle operation?

    <p>Just past the throttle valve</p> Signup and view all the answers

    What approximate air/fuel mixture is typically provided during engine idling?

    <p>10 to 1</p> Signup and view all the answers

    Which part is primarily responsible for the atomization of gasoline?

    <p>The jet</p> Signup and view all the answers

    How is a richer air/fuel mixture achieved when needed?

    <p>By opening the needle valve</p> Signup and view all the answers

    At high speed, which carburetor component primarily delivers fuel to the engine?

    <p>The main jet</p> Signup and view all the answers

    What does the governor do to maintain a constant engine speed?

    <p>Balances the throttle spring tension with engine pressure</p> Signup and view all the answers

    What happens to the RPM of the engine when an additional load is applied?

    <p>RPM decreases</p> Signup and view all the answers

    What is the primary reason the process of adjusting engine speed is called 'hunting'?

    <p>The governor seeks the balance point of forces</p> Signup and view all the answers

    What type of governor is commonly used in agricultural equipment?

    <p>Centrifugal governor</p> Signup and view all the answers

    What role does the throttle spring play in engine power output?

    <p>It creates tension that is balanced by the engine force</p> Signup and view all the answers

    What occurs when the engine reaches maximum RPM?

    <p>The throttle spring closes the throttle valve</p> Signup and view all the answers

    What is likely to happen if the governor's setup is adjusted improperly?

    <p>Inconsistent engine performance</p> Signup and view all the answers

    How does the governor respond when the engine pressure decreases?

    <p>It calls for more throttle spring tension</p> Signup and view all the answers

    What is the simplest form of fuel injection?

    <p>Throttle body injection</p> Signup and view all the answers

    Which type of injection system usually has one injector releasing fuel?

    <p>Throttle body injection</p> Signup and view all the answers

    What is a characteristic of port injection systems?

    <p>Multiple injectors are used, one per cylinder</p> Signup and view all the answers

    Which injection method allows fuel to be delivered in a constant flow?

    <p>Continuous fuel injection</p> Signup and view all the answers

    What is the main disadvantage of direct injection systems?

    <p>They place fuel directly into the combustion chamber</p> Signup and view all the answers

    Which type of injection systems are also referred to as multi-point injection systems (MPFI)?

    <p>Port injection and direct injection</p> Signup and view all the answers

    What determines the amount of fuel sprayed in pulsed fuel injection?

    <p>The length of time the nozzle is open</p> Signup and view all the answers

    Which component is NOT part of electronic fuel injection systems?

    <p>Throttle body</p> Signup and view all the answers

    What is the main purpose of the injector pump in fuel injection systems?

    <p>To meter and deliver fuel to the injectors</p> Signup and view all the answers

    Which component receives the electronic signal to open the pintle in the injector nozzle?

    <p>Central processing unit</p> Signup and view all the answers

    What role do the injector nozzles play in fuel injection systems?

    <p>To atomize and spray gasoline into the engine</p> Signup and view all the answers

    What component can vary the spray pattern of the fuel injected into the engine?

    <p>Spray tip</p> Signup and view all the answers

    What is a key benefit of using electronic fuel injection (EFI) systems?

    <p>Return of unused gasoline to the fuel tank</p> Signup and view all the answers

    Which of the following components is NOT found in fuel injection systems?

    <p>Carburetor float</p> Signup and view all the answers

    Why are sensors necessary in fuel injection systems?

    <p>To ensure precise fuel delivery and system operation</p> Signup and view all the answers

    What should be consulted before servicing or repairing an electronic fuel injection system?

    <p>The operator's or technical manual</p> Signup and view all the answers

    What is a critical safety precaution when inspecting an injector nozzle?

    <p>Wear eye protection to prevent injury</p> Signup and view all the answers

    Which action is recommended if a fuel injection system malfunctions and the operator is untrained?

    <p>Contact a trained service technician</p> Signup and view all the answers

    What should be done before servicing or repairing an injection system?

    <p>Read the owner's or operator's manual</p> Signup and view all the answers

    What can result from checking for leaks in an injector system with bare hands?

    <p>Serious infections due to fluid penetration</p> Signup and view all the answers

    Where should maintenance procedures for injection systems be found?

    <p>The owner's or technical manual</p> Signup and view all the answers

    Why is working on electronic fuel injection systems challenging for average operators?

    <p>They require specialized training and tools</p> Signup and view all the answers

    Which safety measure is not recommended when dealing with injector components?

    <p>Checking injector pressure with bare hands</p> Signup and view all the answers

    What role does the electronic control unit play in electronic fuel injection systems?

    <p>It acts as the brain for the electronic system</p> Signup and view all the answers

    Study Notes

    Gasoline Fuel Systems

    • Almost all modern agricultural equipment uses petroleum products for fuel, primarily gasoline.
    • Gasoline is a blend of petroleum products, its volatility and octane rating determined by the blend.
    • Volatility is the ability of a liquid to turn into vapor. Lower temperatures indicate higher volatility.
    • Octane rating measures gasoline's resistance to knocking (pre-detonation) during combustion. Higher octane ratings resist knocking better.
    • Unleaded regular gasoline typically has an octane rating of 86-87.
    • Higher octane gasoline (90+) is often beneficial for small engines due to reduced fouling.
    • Gasoline fuel systems deliver a combustible air-fuel mixture to the engine.

    Gasoline Fuel System Components

    • Fuel tank: Stores the gasoline.
    • Fuel pump: Transfers gasoline from the tank to the carburetor. Gravity feeds fuel if the tank is above the engine.
    • Carburetor: Atomizes and mixes fuel with air in the precise ratio for combustion.
    • Fuel lines: Carry fuel from the tank through the system to the carburetor.
    • Fuel filter (or sediment bowl): Removes water, dirt, and other contaminants from the fuel.

    Carburetor Components

    • Throat: The tube where air enters and fuel/air mix occurs.
    • Venturi: A constricted area in the throat that increases air speed and reduces pressure, drawing fuel into the mixture.
    • Throttle valve: Controls the amount of air-fuel mixture entering the engine.
    • Bowl (or float chamber): Stores fuel ready for use.
    • Jet: Controls the flow of fuel to the mixture.
    • Choke valve: Allows for a rich mixture needed for cold starts.
    • Float valve: Maintains a constant fuel level in the float chamber.

    Gasoline Carburetor Operation

    • Air is drawn in through the carburetor's throat.
    • The venturi accelerates air, creating a vacuum that draws fuel.
    • The jet atomizes the fuel.
    • Fuel and air mix for efficient combustion.
    • Idle jet provides fuel for starting and maintaining low engine speeds.
    • Throttle valve regulates amount of air-fuel mixture based on engine speed.

    Electronic Fuel Injection Systems (EFI)

    • EFI systems use injectors instead of carburetors.
    • EFI systems precisely control fuel delivery, improving fuel economy, emissions, and cold-weather performance.
    • Types of EFI systems include throttle body, port, and direct injection.
    • Throttle body injection (TBFI) is the simplest type, injecting fuel into the throttle body.
    • Port injection (PFI) injects fuel into the intake ports, often one per cylinder.
    • Direct injection (DI) injects fuel directly into the combustion chamber..

    EFI System Components

    • Fuel pump: Transfers fuel to the injectors.
    • Injectors: Atomize fuel and inject into intake manifold.
    • Electronic control unit (ECU) / computer: Controls fuel injectors and manages the system.
    • Sensors: monitor engine speed, temperature, load, and other key system information, controlling fuel injection accordingly.

    Governor Systems

    • A governor is a device used to control engine RPMs and prevent damage from over- or under-driving.
    • Governors can use vacuum, centrifugal, wind vane, or hydraulic pressures to balance tension on a throttle valve spring.
    • When additional load is applied, it causes an engine speed decrease and a return to a set point.

    Safety Precautions

    • Never check for fuel leakages with bare hands.
    • Use eye protection when working with fuel injection systems.

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Related Documents

    Agricultural Mechanics 8208-A Operation and Service of Gasoline Fuel Systems PDF

    Description

    Test your knowledge on gasoline fuel systems used in modern agricultural equipment. Learn about the components, octane ratings, and the importance of volatility in fuel mixtures. This quiz covers key concepts essential for understanding how gasoline powers machinery.

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser