AGK (aircraft general knowledge) ATPL with correct answers 100% 2026

AGK (aircraft general knowledge) ATPL with correct answers 100% 2026 How does the propeller work? - Correct Answer It works by accelerating a large amount of air by small amount How does jet work? - Correct Answer By accelerating a small amount of air by large amount What does the propeller consist of? - Correct Answer Two or more aerodynamic blades attached to a central hub. It is shaped like a wing and has a trailing edge, leading edge, a root and a tip How is the propeller set into its hub? - Correct Answer So that it chord line forms an angle with the plane of rotation of the propeller, this is called pitch or blade angle How does the rotational speed of a propeller increase? - Correct Answer With the radius from the centre of the hub, therefore untwisted propeller, the outer part would generate much more thrust than at the root What causes the bending force? - Correct Answer The fact that for untwisted propeller, the outer part would generate much more thrust than at the root How is the bending force evened out? - Correct Answer The blade is twisted to allow the root to generate as much lift as the tip What is a fixed pitch propeller? - Correct Answer It is easy to use and has a few mechanical parts. However the aircraft TAS and its own RPM control the angle of attack. The propeller is therefore calibrated for certain set of conditions, like climb or cruise propellers How are the controls for power for variable pitch propellers - Correct Answer They are manifold pressure and RPM. Each has separate controller in the cockpit or one can be changed without the other What happens once the RPM has been set on a variable pitch? - Correct Answer A control unit will automatically keep the desired RPM by varying the pitch of the propeller, despite airspeed and manifold pressure variations What does a feathering feature on some variable pitch propellers allow the propeller to do? - Correct Answer To be turned into the airstream in case of an engine failure How is the variable pitch propeller actuated? - Correct Answer Hydraulically, using oil from the lubrication of the engine. The pressure is boosted by a small pump in the CSU (constant speed unit) What are the two kinds of actuation on a variable pitch propeller? - Correct Answer Single acting propeller and double acting propeller How is the single acting propeller? - Correct Answer Pitch change cylinder pushed rearwards. Oil puts the propeller into fine pitch while counterweights or spring toward coarse. What controls the pitch on a single acting propeller? - Correct Answer The CSU. Oil supply to fine pitch (RPM increase) Oil shutoff/hydraulic lock (RPM steady) Drain of oil back to scavenge (RPM decrease) How does the double acting propeller work? - Correct Answer Similar to single acting but it has a bit larger cylinder piston for pitch change. The oil can work on the both sides of the piston, one for fine pitch, the other for coarse pitch. Therefore no need is for springs or counterweights on the propeller.