Small Engine Tech-Carburetor Quiz with
Diagram Latest Version 100% Pass
Choke valve purpose in a small engine carburetor?
✔✔ To restrict airflow and enrich the fuel mixture for cold starting.
What part of the carburetor controls the engine speed?
✔✔ The throttle valve.
Why is the float in a carburetor important?
✔✔ It maintains the proper fuel level in the float bowl.
What causes a small engine to run lean?
✔✔ Too much air or not enough fuel in the air-fuel mixture.
How does the carburetor atomize fuel?
✔✔ By drawing fuel through a jet and mixing it with fast-moving air.
1
,What does the main jet do in a carburetor?
✔✔ It regulates fuel flow to the engine during high-speed operation.
Why would a dirty air filter affect carburetor performance?
✔✔ It restricts airflow, causing a rich fuel mixture.
How does the primer bulb help start an engine?
✔✔ It manually pushes fuel into the carburetor to aid starting.
What symptom occurs if the carburetor float sticks open?
✔✔ Fuel floods into the carburetor, causing engine flooding.
Why is it important to adjust the idle speed screw correctly?
✔✔ To ensure the engine runs smoothly without stalling at low speeds.
What part mixes air and fuel in the carburetor?
✔✔ The venturi.
2
, Why might an engine hesitate when accelerating?
✔✔ The carburetor’s accelerator pump may not be working properly.
What does the idle mixture screw control?
✔✔ The ratio of air to fuel at idle speed.
Why is ethanol-blended fuel sometimes problematic for carburetors?
✔✔ It attracts moisture and can lead to corrosion or gumming in fuel passages.
How can a clogged main jet affect engine performance?
✔✔ It can cause the engine to run lean or stall under load.
What is the purpose of the venturi in a carburetor?
✔✔ To increase air velocity and create a vacuum to draw in fuel.
How can a leaking carburetor gasket affect engine operation?
✔✔ It can cause air leaks and disrupt the fuel-air mixture.
3
Diagram Latest Version 100% Pass
Choke valve purpose in a small engine carburetor?
✔✔ To restrict airflow and enrich the fuel mixture for cold starting.
What part of the carburetor controls the engine speed?
✔✔ The throttle valve.
Why is the float in a carburetor important?
✔✔ It maintains the proper fuel level in the float bowl.
What causes a small engine to run lean?
✔✔ Too much air or not enough fuel in the air-fuel mixture.
How does the carburetor atomize fuel?
✔✔ By drawing fuel through a jet and mixing it with fast-moving air.
1
,What does the main jet do in a carburetor?
✔✔ It regulates fuel flow to the engine during high-speed operation.
Why would a dirty air filter affect carburetor performance?
✔✔ It restricts airflow, causing a rich fuel mixture.
How does the primer bulb help start an engine?
✔✔ It manually pushes fuel into the carburetor to aid starting.
What symptom occurs if the carburetor float sticks open?
✔✔ Fuel floods into the carburetor, causing engine flooding.
Why is it important to adjust the idle speed screw correctly?
✔✔ To ensure the engine runs smoothly without stalling at low speeds.
What part mixes air and fuel in the carburetor?
✔✔ The venturi.
2
, Why might an engine hesitate when accelerating?
✔✔ The carburetor’s accelerator pump may not be working properly.
What does the idle mixture screw control?
✔✔ The ratio of air to fuel at idle speed.
Why is ethanol-blended fuel sometimes problematic for carburetors?
✔✔ It attracts moisture and can lead to corrosion or gumming in fuel passages.
How can a clogged main jet affect engine performance?
✔✔ It can cause the engine to run lean or stall under load.
What is the purpose of the venturi in a carburetor?
✔✔ To increase air velocity and create a vacuum to draw in fuel.
How can a leaking carburetor gasket affect engine operation?
✔✔ It can cause air leaks and disrupt the fuel-air mixture.
3
