FAA Reciprocating Powerplant Practice Test

These questions are part of the practice quiz. Start practicing

• Why are regular inspections essential for reciprocating engines?
• What is the significance of cylinder head temperature (CHT) readings?
• When do small induction system air leaks affect engine operation the most?
• What effect does a worn cylinder wall have on engine operation?
• When should the combustion process be completed if the fuel/air ratio is proper and ignition timing is correct?
• Describe the function of the governor in a constant-speed propeller system.
• Which of the following engine servicing operations generally requires engine pre-oiling prior to starting the engine?
• What maintenance practice is essential to minimize engine backfiring?
• What is the likely result of grinding the valves of a reciprocating engine to a feather edge?
• How does an increased maximum compression ratio affect an aircraft engine?
• In what scenario is a 'runup' check most crucial?
• What is the primary purpose of the oil control ring in an engine?
• What tool is generally used to measure the crankshaft rotation in degrees?
• Increased water vapor (higher relative humidity) in the incoming air to a reciprocating engine will normally result in which of the following?
• What can be concluded about the valve overlap of an engine?
• What is the benefit of a dual ignition system in reciprocating engines?
• What is one effect of operating engines at high temperatures?
• What is pre-ignition in the context of aircraft engines?
• Why is engine timing crucial for optimal engine operation?
• What is the primary role of a magneto in an ignition system?
• If the No. 3 cylinder of a nine-cylinder radial engine fails to hold pressure after rotating the crankshaft, how is this usually interpreted?
• What indicates an engine may detonate more likely when using fuel?
• Which statement about fuel/air ratios is correct?
• How does engine altitude compensation work?
• What are the two types of ignition systems commonly used in reciprocating engines?
• Which of the following will decrease volumetric efficiency in a reciprocating engine?
• During a ground check, if the engine runs rough and manifold pressure is high for a specific RPM, what could the cause be?
• Which bearing is least likely to be a roller or ball bearing?
• Which factor most affects the timing of valve events in an engine?
• What is a 'runup' check in aviation?
• Why is it important to monitor detonation in an aircraft engine?
• What should be monitored during a post-flight inspection?
• Which statement is true regarding bearings used in high-powered reciprocating aircraft engines?
• What maintenance practice is essential for ensuring a reciprocating engine's longevity?
• An increase in manifold pressure with a constant RPM will cause the bearing load in an engine to?
• How does proper ignition timing affect fuel efficiency?
• What does a fuel flow indicator measure in a reciprocating engine system?
• What is the difference between lean and rich fuel mixtures?
• What is the most reliable indication of worn valve guides?
• What is the correct order to reduce power output for an engine with a constant-speed propeller?
• If the oil pressure of a cold engine is higher than at normal operating temperatures, the
• What type of bearings are master rod bearings generally?
• What happens if piston ring gaps are aligned during a differential-pressure compression check?
• Why do standard aircraft cylinder oversizes range from 0.010 inch to 0.030 inch?
• Before attempting to start a radial engine that has been shut down for more than 30 minutes,
• What is the function of engine baffles in a reciprocating engine?
• What is an important maintenance step to enhance engine efficiency in aircraft?
• What does 'specific fuel consumption' help determine in engine performance?
• What is meant by 'specific fuel consumption' in an engine?
• Why is monitoring engine vibration important in aircraft?
• When is the fuel/air mixture ignited in a conventional reciprocating engine?
• In what position should spark plugs be reinstalled after servicing from an opposed engine?
• What is the purpose of the propeller governor in a reciprocating engine?
• What is the primary reason for the proper timing in the combustion process?
• In a reciprocating engine, what can cause a significant decrease in performance?
• In what units is an engine's rated power output usually specified?
• What generally causes engine backfiring in aircraft engines?
• The operating temperature valve clearance of a radial engine as compared to cold valve clearance is?
• Engine operating flexibility refers to its ability to?
• What effect does incorrect ignition timing have on engine operation?
• Why are disassembled engine parts usually degreased with mineral spirits solvent?
• What effect does improper valve timing have on engine performance?
• What can be the consequence of using contaminated fuel in an aircraft engine?
• What is a common sign of an excessively lean fuel mixture?
• Why is it crucial to maintain proper oil pressure in an aircraft engine?
• Which of the following is one of the best indicators of reciprocating engine combustion chamber problems?
• What is the primary purpose of conducting a power check on a reciprocating engine?
• Which component in an aircraft engine is most affected by improper grinding of valves?
• Excessive valve clearances will cause the duration of valve opening to
• What is an outcome of proper valve timing in aircraft engines?
• What is the primary function of an exhaust system in a reciprocating engine?
• What is a likely cause of a reciprocating engine backfiring through the induction system at low RPM?
• In a four-stroke cycle engine with a 6-inch stroke operating at 2,000 RPM, when is the piston movement at maximum velocity?
• What does the discovery of small metallic particles in the oil filter usually indicate?
• What factors can significantly affect engine performance during takeoff?
• When cleaning aluminum and magnesium engine parts, why is it inadvisable to soak them in soap solutions?
• What can be a potential effect of fuel imbalances in an engine?
• What can excessive engine oil temperatures indicate during operation?
• What is the primary purpose of conducting a leakage test in an aircraft engine?
• What is a likely cause of fluctuating oil pressure from zero to normal operating pressure?
• When can a reciprocating engine using hydraulic valve lifters expect to have no clearance in its valve-operating mechanism after reaching minimum inlet oil and cylinder head temperatures?
• What does low engine vibration usually indicate?
• What determines the service life of a reciprocating engine?
• What implies a misfiring engine related to fuel mix issues?
• Which of the following is a sign of an abnormal engine behavior noted during flight?
• What is the compression ratio?
• Engine crankshaft runout is usually checked
• Why does the smoothness of operation of an engine increase with a greater number of cylinders?
• In aviation engines, what does the term "horsepower" refer to?
• Which factors establish the maximum compression ratio limitations of an aircraft engine?
• A nine-cylinder engine with a bore of 5.5 inches and a stroke of 6 inches will have a total piston displacement of?
• In a radial engine, where is the thrust bearing typically located?
• What is the purpose of a fuel selector valve?
• What is the term for the actual power delivered to the propeller of an aircraft engine?
• How is proper end-gap clearance on new piston rings assured during an engine overhaul?
• What is the primary purpose of the spark plug in a reciprocating engine?
• What is an advantage of using metallic-sodium filled exhaust valves in aircraft reciprocating engines?
• What function does the floating control thermostat serve in certain reciprocating engine installations?
• What is a common consequence of prolonged pre-ignition in an aircraft engine?
• What is the effect of using a taper-ground cylinder?
• What occurs if the manifold pressure is not decreased along with engine RPM under certain conditions?
• Why is an engine's weight-to-power ratio important?
• Excessive valve clearance in a piston engine results in what effect?
• In the context of aircraft engines, what does 'smooth running' signify?
• What is a key indication of engine health related to 'smooth running'?
• What does the oil cooler do in a reciprocating engine's lubrication system?
• Which factor primarily affects an engine's power output at high altitude?
• What is a common result of an excessively rich mixture in an aircraft engine?
• What is the function of an air filter in a reciprocating engine?
• What is the purpose of valve overlap in an engine?
• In an engine ground check, if the ignition switch is moved from BOTH to either LEFT or RIGHT, what is a normal indication?
• What could cause excessive pressure buildup in the crankcase of a reciprocating engine?
• What is one potential cause of afterfiring in an aircraft engine?
• What is 'engine roughness' and what can cause it?
• If an engine experiences a condition of no clearance in the valve mechanism after warming up, what is a plausible cause?
• What is a common operational issue that can result from improper fuel mixture?
• What should be avoided when grinding valves of a reciprocating engine?
• Why is it important to maintain proper ignition timing in a reciprocating engine?
• What is a potential indicator of a hydraulic lifter issue in an engine?
• What is a common symptom of worn piston rings in an aircraft reciprocating engine?
• If air is heard coming from the crankcase breather or oil filler during a differential compression check, what does this indicate?
• During a compression check, what does a propeller movement in the direction of engine rotation indicate?
• What characteristic does the lean fuel mixture improve in an engine's performance?
• What process is commonly used to harden cylinder barrels?
• Which issue is commonly diagnosed through inspecting spark plugs?
• What is the primary purpose of setting proper valve timing and overlap?
• Where on a normally operating engine's cylinder walls is the most wear likely to occur?
• What are the visible signs of a fuel leak in an aircraft engine?
• Direct mechanical push-pull carburetor heat control linkages should normally be adjusted so that the stop located on the diverter valve will be contacted?
• During which operation does excessive pressure in the crankcase most commonly occur?
• What corrective action can ensure proper fuel-air mixtures in an aircraft engine?
• How does high operational temperature impact engine components?
• How can backfiring in an aircraft engine be effectively prevented?
• The horsepower developed in the cylinders of a reciprocating engine is referred to as what?
• Valve clearance changes on opposed-type engines using hydraulic lifters are accomplished by?
• What is the likely result of excessive valve clearance in a cylinder on a reciprocating aircraft engine?
• What might cause a rich fuel mixture in an engine?
• Why are lubrication passages essential in a reciprocating engine?
• What is the function of the crankshaft in a reciprocating engine?
• What might decreased performance in a reciprocating engine indicate?
• When removing an engine cylinder, at what piston position should the piston be?
• What does valve overlap promote?
• What is the primary purpose of valve springs in an aircraft reciprocating engine?
• How does detonation differ from pre-ignition in an aircraft engine?
• During an overhaul, how are reciprocating engine exhaust valves typically checked for stretch?
• Why is it crucial to identify leaks in the combustion chamber of an aircraft engine?
• Given certain valve timings, how many degrees will the crankshaft rotate with both the intake and exhaust valves seated?
• What is the purpose of the cooling fins on a cylinder head?
• What component is primarily responsible for fuel-air mixture delivery to the combustion chamber?
• What is the purpose of choked or taper-ground cylinders in aircraft engines?
• To what altitude will a turbocharged engine maintain sea level pressure?
• What aspect of engine performance does a 'smooth running' engine minimize?
• An engine misses in both the right and left positions of the magneto switch. The quickest method for locating the trouble is to
• Which component is primarily responsible for maintaining the engine's smoothness at higher RPMs?
• What will occur if hot clearance is used to set the valves when the engine is cold?
• A hissing sound from the exhaust stacks when the propeller is being pulled through manually indicates
• What does a malfunctioning governor typically affect in a constant-speed propeller system?
• What type of bearing is commonly used for crankshaft main bearings in radial engines?
• What are full-floating piston pins designed to allow motion between?
• What is the principal advantage of using propeller reduction gears?
• To reduce the power output of an engine equipped with a constant-speed propeller and operating near maximum BMEP, what should be done first?
• What effect does altitude have on engine performance?
• How does a carburetor function in a reciprocating engine?
• Which of the following are signs of overheating in a reciprocating engine?
• In a four-stroke cycle aircraft engine, when does the intake valve close?
• What indicates that there could be a problem with an engine's ignition system?
• How is engine performance impacted when changing altitude?
• What do you understand by 'valve overlap'?
• Regarding cast iron and chrome-plated piston rings, which statement is true?
• What is the purpose of a fuel-air mixture?
• If the intake valve is opened too early in a four-stroke cycle engine, what could be a consequence?
• What is the function of moveable counterweights on engine crankshafts?
• Which conditions lead to an increased likelihood of engine detonation?
• What is the main objective of operating an engine at 'lean of peak'?
• Which of the following factors is essential for preventing backfiring?
• What technique is typically utilized to measure the travel of a piston during its stroke?
• What defines an 'overhauled' engine?
• What is indicated by a spark plug that is excessively fouled?
• Which fuel/air mixture will produce the highest engine temperature?
• What is a key characteristic of dyna-focal engine mounts in aircraft reciprocating engines?
• How is 'compression ratio' defined in the context of aircraft engines?
• How is valve overlap defined?
• How can you determine if a dry sump engine has been sufficiently pre-oiled?
• What is the purpose of the piston rings in a reciprocating engine?
• At what speed must a crankshaft turn if each cylinder of a four-stroke cycle engine is to be fired 200 times a minute?
• What happens to a reciprocating engine's power output when operating at full throttle from sea level to 10,000 feet?
• If the crankshaft runout readings on the dial indicator are plus .002 inch and minus .003 inch, how much runout is there?
• How does a turbocharger improve engine performance?
• During an engine control system inspection, what should be checked about the threaded rod ends?
• What is one common consequence of incorrect valve timing in a four-stroke engine?
• In aircraft engines, maintaining regular power output is crucial for?
• What does a massive drop in manifold pressure after reducing RPM indicate?
• What condition is most likely to cause detonation in an aircraft engine?
• Which of the following is most likely to occur if an overhead valve engine is operated with inadequate valve clearances?
• What material are most pistons made from in reciprocating engines?
• How does higher compression ratio affect an engine's efficiency?
• What effect does increasing manifold pressure have on engine performance?
• What is the compression ratio if the cylinder volume equals 70 cubic inches at bottom center and 10 cubic inches at top center?
• A condition that can occur in radial engines but is unlikely to occur in horizontally opposed engines is?
• What is mandated by 14 CFR Part 43 Appendix D for an annual/100-hour inspection on engines?
• If an engine produces excessive vibrations at idle, what could be the cause?
• The five events of a four-stroke cycle engine in the order of their occurrence are?
• Which of the following is a characteristic of a thrust bearing used in most radial engines?
• When does valve overlap occur in the operation of an aircraft reciprocating engine?
• What could happen if valve springs do not operate correctly?
• What is the effect of high cylinder head temperature on engine performance?
• What part of the engine is most likely to experience wear besides the cylinder walls?
• Backfiring through the carburetor is typically caused by what?
• Which condition would be the least likely to be caused by failed or failing engine bearings?
• What should always be verified before operating an engine for the first time after an overhaul?
• If ignition occurs at 28° BTDC and the intake valve opens at 15° BTDC, how many degrees of crankshaft travel after ignition does the intake valve open?
• What is the purpose of the safety circlet installed on some valve stems?
• What is detonation in an aircraft engine, and why is it dangerous?
• If an engine operates with low oil pressure and high oil temperature, what might be the problem?
• If the exhaust valve of a four-stroke cycle engine is closed and the intake valve is just closed, what stroke is the piston on?
• What can be the result of having the valve clearance set too tight?
• If metallic particles are found in the oil filter during inspection, what should be done?
• What is a potential risk associated with using fuel that is contaminated?
• How does excessive valve clearance affect engine performance?
• What can high engine vibration indicate?
• What role does the ignition timing play in engine performance?
• In a four-stroke engine, what happens after the compression stroke?
• Which condition would indicate a general weak-engine condition when tested with a fixed-pitch propeller?
• Reduced air density at high altitude has a decided effect on carburetion, resulting in a reduction of engine power by?
• What does the term 'lean of peak' operation refer to?
• What is the function of the oil cooler in a reciprocating engine?
• Why are cam-ground pistons installed in some aircraft engines?
• What is the maximum valve clearance of an engine using hydraulic lifters when the lifters are empty?
• What might indicate that an oil cooler is clogged?
• What does valve timing primarily affect in an engine?
• What is likely to occur if a reciprocating engine is operated at high power settings before it is properly warmed up?
• What operational change affects performance in fixed pitch propellers?
• Describe the primary types of fuel used in reciprocating engines.
• During a four-stroke engine cycle, what occurs immediately after the intake stroke?
• What is the outcome of excessive valve clearance?
• What aspect of an engine's cooling system does the cylinder head cooling fins assist?
• What is the primary concern when establishing the firing order for an opposed engine?
• Which of the following statements regarding preignition and detonation is true?
• What is the purpose of having two or more valve springs in aircraft engines?
• What purpose does a turbocharger serve in a reciprocating engine?
• During which strokes are both valves on a four-stroke cycle reciprocating aircraft engine open?
• What are the key components of a reciprocating engine's lubrication system?
• What special procedure must be followed when adjusting the valves of an engine equipped with a floating cam ring?
• Which type of engine typically utilizes a higher compression ratio for better efficiency?
• What is the role of valve timing in engine performance?