Powerplant ASA/Baker's School List of FAA Oral Questions | 443 Questions with 100% Correct Answers | Updated & Verified | 2024

What is the main advantage of a horizontally opposed engine over a radial engine for powering modern aircraft? - The horizontally opposed engine has a much smaller frontal area and is easier to streamline than a radial engine. How many throws are there in the crankshaft of a six-cylinder horizontally opposed engine? - six What kind of connecting rod arrangement is used in a radial engine? - A master rod connects the single throw of the crankshaft with a piston. All other pistons are connected to the master rod with link rods. Of what material are most piston rings made? - gray cast iron What is the reason for using hydraulic valve lifters in an aircraft engine? - Hydraulic lifters keep all the clearance out of the valve operating mechanism. This decreases the wear of the valve train components. At what speed does the camshaft turn in relation to the crankshaft? - one half the speed of the crankshaft