8 Piston Engines Carburettors 📄 Detailed Notes⚡ Cheat Sheet Results📄 Notes ⚡ Cheat Sheet📄 Notes ⚡ Cheat SheetQ1. To enable proper functioning of a piston engine during throttle advance a carburettor fitted with: A power jet A mixture control A diffuser (compensating jet) An accelerator pump Q2. Which statement is correct concerning the effect of the application of carburettor heat? The volume of air entering the carburettor is reduced, thus enriching the fuel/air mixture The density of the air entering the carburettor is reduced, thus leaning the fuel/air mixture The volume of air entering the carburettor is reduced, thus leaning the fuel/air mixture The density of the air entering the carburettor is reduced, thus enriching the fuel/air mixture Q3. When applying carburettor heating: the mixture becomes leaner a decrease in RPM results from the lean mixture the mixture becomes richer no change occurs in the mixture ratio Q4. In which sections of the carburettor would icing most likely occur? Accelerator pump and main metering jet Venturi and the throttle valve Main air bleed and main discharge nozzle Float chamber and fuel inlet filter Q5. In an engine equipped with a float-type carburettor, the low temperature that causes carburettor ice is normally the result of: low volatility of aviation fuel compression of air at the carburettor venturi freezing temperature of the air entering the carburettor vaporization of fuel and expansion of the air in the carburettor Q6. A fuel strainer when fitted to a carburettor will be positioned: between the metering jet and the discharge nozzle between the needle valve and the metering jet upstream of the needle valve downstream of the discharge nozzle Q7. To maintain a constant mixture at low and high power settings in a piston engine, a carburettor is fitted with: an accelerator pump a mixture control a power jet a diffuser (compensating jet) Q8. The main function of a carburettor in a piston engine is to: Control the amount of air entering the airscoop Prevent vapour lock Prevent detonation Supply a correct fuel-air mixture at all speeds Q9. In a piston engine, the purpose of an altitude mixture control is to: correct for variations in the fuel/air ratio due to decreased air density at altitude weaken the mixture strength because of reduced exhaust back pressure at altitude prevent a weak cut when the throttle is opened rapidly at altitude enrich the mixture strength due to decreased air density at altitude Q10. The main purpose of the mixture control is to: decrease the oxygen supplied to the engine decrease the air supplied to the engine adjust the fuel flow to obtain the correct fuel/air ratio increase the oxygen supplied to the engine Q11. The function of a diffuser (compensation jet) is to: Maintain a constant mixture in a piston engine at low and high power settings Enable proper functioning of a piston engine during throttle advance Enable engine starting Enable engine idling Q12. The operating principle of float-type carburettors is based on the: increase in air velocity in the throat of a venturi causing an increase in air pressure measurement of the fuel flow into the induction system automatic metering of air at the venturi as the aircraft gains altitude difference in air pressure at the venturi throat and the air inlet Q13. The purpose of the venturi in a carburettor is to: create the suction necessary to cause fuel to flow through the carburettor main jets create a rise in pressure at the throat before the mixture enters the induction system prevent enrichment of the mixture due to high air velocity through the carburettor ensure complete atomisation of the fuel before entering the injection system Q14. The purpose of the venturi in a carburettor is to: create the depression necessary to cause fuel to flow through the carburettor jets prevent enrichment of the mixture due to high air velocity through the carburettor ensure complete atomisation of the fuel before entering the induction system create a rise in pressure at the throat before the mixture enters the induction system Previous Submit The Test← Previous QuizNext Quiz →