III.I.K2 Flashcards
- On a float type carburetor, the purpose of the economizer valve is to?
Provide a richer mixture and cooling at max power output.
- The fuel metering force of a conventional float type carburetor in its normal operating range is the difference between the pressure acting on the discharge nozzle located within the venturi and the pressure?
Acting on the fuel in the float chamber.
- If the main air bleed of a float type carburetor becomes clogged, the engine will run?
Rich at rated power.
- Which method is commonly used to adjust the level of a float in a float type carburetor?
Add or remove shims under the needle valve seat.
- What is the possible cause of an engine running rich at full throttle if it is equipped with a float type carburetor?
Clogged main air bleed.
- One of the things a metering orifice in a main air bleed helps to accomplish (at a given altitude) in a carburetor is?
Better fuel vaporization and control of fuel discharge, especially at lower engine speeds.
- A punctured float in a float type carburetor will cause the fuel level to?
Rise, and enrich the mixture.
- Float type carburetors which are equipped with economizers are normally set for?
Their leanest practical mixture delivery at cruising speeds and enriched by means of the economizer system at higher power settings.
- If a float type carburetor becomes flooded, the condition is most likely caused by?
A leaking needle valve and seat assembly.
- If an engine is equipped with a float type carburetor and the engine runs excessively rich at full throttle, a possible cause of the trouble is a clogged?
Main air bleed.
- Select the correct statement concerning the idle system of a conventional float type carburetor.
The low pressure between the edges of the throttle valve and the throttle body pulls the fuel from the idle passage.
- The economizer system of a float type carburetor performs which of the following functions?
It supplies and regulates the additional fuel required for all engine speeds above cruising.
- The fuel level within the float chamber of a properly adjusted float type carburetor will be?
Slightly lower than the discharge nozzle outlet
- Select the statement which is correct relating to a fuel level check of a float type carburetor.
Do not measure the level at the edge of the float chamber.
- If fuel is found running from the carburetor with the engine not running, the likely cause is that the?
Float needle valve is not seated properly.
- Fuel is discharged for idling speeds on a float type carburetor?
From the idle discharge nozzle.
- Where is the throttle valve located on a float type carburetor?
After the main discharge nozzle and venturi.
- One purpose of an air bleed in a float type carburetor is to?
Decrease fuel density and destroy surface tension.
- To determine the float level in a float type carburetor, a measurement is usually made from the top of the fuel in the float chamber to the?
Parting surface of the carburetor.
- The throttle valve of float type aircraft carburetors is located?
Between the venturi and the engine.
- Why must a float type carburetor supply a rich mixture during idle?
Because at idling speeds the engine may not have enough airflow around the cylinders to provide proper cooling.
- At what engine speed does the main metering jet actually function as a metering jet in a float type carburetor?
All RPMs above idle range.
- What is a function of the idling air bleed in a float type carburetor?
It aids in emulsifying/vaporizing the fuel at idle speeds.
- What method is ordinarily used to make idle speed adjustments on a float type carburetor?
An adjustable throttle stop or linkage.
- The purpose of the back suction mixture control in a float type carburetor is to adjust the mixture by?
Regulating the pressure on the fuel in the float chamber.
- If the idling jet becomes clogged in a float type carburetor, the?
Engine will not idle.
- The economizer system in a float type carburetor?
Increases the air fuel ratio at high power settings.
- If an engine equipped with a float type carburetor backfires or misses when the throttle is advanced, a likely cause is that the?
Accelerating pump is not operating properly.
- What precaution should be taken when putting thread lubricant on a tapered pipe plug in a carburetor float bowl?
Engage the 1st thread of the plug, then put a small amount of lubricant on the 2nd thread and screw the plug in.
