EETC Carburetor Service and Repair

Question 1

What is the primary function of a carburetor in a small engine?

Accepted Answer

To mix air and fuel in the correct ratio for combustion

Answer

To cool the engine during operation

Answer

To generate electrical current for the ignition system

Answer

To regulate oil pressure throughout the engine

Question 2

What component in a float-type carburetor controls the fuel level in the bowl?

Accepted Answer

The needle valve and float assembly

Answer

The main jet orifice

Answer

The venturi tube diameter

Answer

The throttle plate position

Question 3

What is the stoichiometric (ideal) air-to-fuel ratio for gasoline combustion?

Accepted Answer

14.7:1

Answer

10:1

Answer

20:1

Answer

8:1

Question 4

Which carburetor circuit provides fuel to the engine during idle operation?

Accepted Answer

Idle circuit

Answer

Main metering circuit

Answer

Choke enrichment circuit

Answer

Accelerator pump circuit

Question 5

What physical principle draws fuel from the bowl into the airstream inside a carburetor?

Accepted Answer

The venturi effect creating low pressure at the narrowed passage

Answer

Fuel pump pressure pushing fuel upward

Answer

Float buoyancy forcing fuel through the main jet

Answer

Gravity feeding fuel from a raised bowl

Question 6

What material is most commonly used for small-engine carburetor body construction?

Accepted Answer

Zinc die-cast alloy

Answer

Stamped steel sheet metal

Answer

Stainless steel casting

Answer

Machined brass

Question 7

What is the purpose of the emulsion tube found in some carburetors?

Accepted Answer

To introduce air into the fuel stream and atomize it before the venturi

Answer

To filter debris before fuel enters the bowl

Answer

To control the choke plate opening angle

Answer

To regulate throttle response at high speed