FAA Powerplant Written Test questions with correct answers

Based on the criteria of efficiency of an engines weight to the power it produces, which type of engine is the best choice for an aircraft operating at speeds of 300mph at altitudes between 20,000-25,000 ft? CORRECT ANSWER Turboprop Engines An aircraft engine has 9 cylinders. From this information alone we can deduce that CORRECT ANSWER its firing order is 1-3-5-7-9-2-4-6-8 The crankcase of an aircraft engine CORRECT ANSWER Is the foundation of the engine containing crankshaft bearings and cylinder pads The cylinders of an engine are mounted on cylinder pads that are machined onto the crankcases. The common method of attachment of the cylinders to the crankcase is CORRECT ANSWER by studs mounted in threaded holes in the crankcase The crankpin is CORRECT ANSWER Hardened by nitriding and is hollow to reduce weight Which statement is correct about radial engine aircraft? CORRECT ANSWER Moveable counterweights serve to reduce the dynamic vibrations in an aircraft reciprocating engine. Master rod bearings are generally what type? CORRECT ANSWER Plain Cam-ground pistons are installed in some aircraft engines to CORRECT ANSWER provide a better fit at operating temperatures