6 Piston Engines Fuel📄 Detailed Notes⚡ Cheat Sheet Results📄 Notes ⚡ Cheat Sheet📄 Notes ⚡ Cheat SheetQ1. Which one of the following factors would be most likely to increase the possibility of detonation occurring within a piston engine? Slightly retarding the ignition timing The use of a fuel with a high octane rating as compared to the use of one with a low octane rating. Using an engine with a low compression ratio High cylinder head temperature Q2. If the engine, with a fixed pitch propeller, is detonating during climb out after takeoff, the normal corrective action would be to: increase the rate of climb reduce the throttle lean the mixture apply carburettor heat Q3. The conditions which can cause detonation are: High manifold pressure and high revolutions per minute High manifold pressure and low revolutions per minute Low manifold pressure and high revolutions per minute Low manifold pressure and high fuel flow Q4. With a piston engine, when detonation is recognised, you: Increase manifold pressure and lean the mixture Reduce manifold pressure and lean the mixture Increase manifold pressure and enrich the mixture Reduce manifold pressure and enrich the mixture Q5. When detonation is recognised in a piston engine, the correct procedure is to: reduce manifold pressure and lean the mixture. increase manifold pressure and lean the mixture. reduce manifold pressure and fully enrich the mixture. increase manifold pressure and fully enrich the mixture. Q6. Which one of the following factors would be most likely to increase the possibility of detonation occurring within a piston engine? using too lean a fuel/air mixture slightly retarding the ignition timing using an engine with a low compression ratio the use of a fuel with a high octane rating as compared to the use of one with a low octane rating Q7. The use of too low an octane fuel may cause: higher manifold pressure vapour locking detonation a cooling effect on cylinders Q8. A piston engine may use a fuel of a different grade than the recommended: provided that it is an aeronautical petrol never provided that the grade is higher provided that the grade is lower Q9. Spark timing is related to engine speed in the way that the: faster the engine functions, the more retarded the spark is slower the engine functions, the more the spark is advanced faster the engine functions, the more the spark is advanced faster the engine functions, the further past TDC the spark occurs Q10. The purpose of the barometric correction in a fuel controller is to: maintain the correct fuel to air mass ratio when the altitude increases maintain a constant fuel flow whatever the altitude is reduce the fuel to air mass ratio when the altitude increases increase the fuel to air mass ratio when the altitude increases Q11. The cylinder head and oil temperatures may exceed their normal operating ranges if: the engine is operated at a too rich mixture a lower octane rating than specified for the engine is used a higher octane rating than specified for the engine is used the engine is operated at a higher than normal oil pressure Q12. The cylinder head and oil temperature gauges are to exceed the normal operating ranges if a pilot uses fuel that has a rating higher-than-specified for the engine operates with the mixture control set too rich uses fuel that has a rating lower-than-specified for the engine operating with higher-than-normal oil pressure Q13. Pre-ignition refers to the condition that may arise when: the mixture is ignited by abnormal conditions within the cylinder before the spark occurs at the plug the sparking plug ignites the mixture too early the mixture is ignited before the piston has reached top dead centre a rich mixture is ignited by the sparking plugs Q14. Vapour locking is caused by: the formation of water vapour in a fuel system. vaporizing of fuel in the nozzles. the inability of fuel to vaporize in the nozzles. vaporizing of fuel prior to the engine. Previous Submit The Test← Previous QuizNext Quiz →