Questions on Engine Fuel and Fuel Metering Systems
1. A reciprocating engine automatic mixture control responds to changes in air density caused by changes in
Altitude or temperature 2. On a float-type carburetor, the purpose of the economizer valve is to
Provide a richer mixture and cooling at maximum power output 3. 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 venture and the pressure
Acting on the fuel in the float chamber 4. If the main air bleed of a float-type carburetor becomes clogged, the engine will run
Rich at rated power 5. 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 6. 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 7. 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. 8. A punctured float in a float-type carburetor will cause the fuel level to
Rise, and enrich the mixture. 9. The back-suction mixture control system operates by
Varying the pressure acting on the fuel in the float chamber. 10. If an aircraft engine is equipped with a carburetor that is not compensated for altitude and temperature variations, the fuel/air mixture will become
Richer as either the altitude or temperature increases. 11. 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. 12. If a float-type carburetor becomes flooded, the condition is most likely caused by
A leaking needle valve and seat assembly. 13. If an
Altitude or temperature 2. On a float-type carburetor, the purpose of the economizer valve is to
Provide a richer mixture and cooling at maximum power output 3. 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 venture and the pressure
Acting on the fuel in the float chamber 4. If the main air bleed of a float-type carburetor becomes clogged, the engine will run
Rich at rated power 5. 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 6. 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 7. 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. 8. A punctured float in a float-type carburetor will cause the fuel level to
Rise, and enrich the mixture. 9. The back-suction mixture control system operates by
Varying the pressure acting on the fuel in the float chamber. 10. If an aircraft engine is equipped with a carburetor that is not compensated for altitude and temperature variations, the fuel/air mixture will become
Richer as either the altitude or temperature increases. 11. 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. 12. If a float-type carburetor becomes flooded, the condition is most likely caused by
A leaking needle valve and seat assembly. 13. If an