A&P Power Plant Reciprocating Engines Practice Test

These questions are part of the practice quiz. Start practicing

• When does valve overlap occur in the operation of an aircraft reciprocating engine?
• Master rod bearings are generally what type?
• What could excessive engine vibration indicate?
• Why are aircraft engines at a higher risk of overheating compared to automobile engines?
• Backfiring through the carburetor is typically the result of using what kind of mixture?
• How can it be determined that a reciprocating engine with a dry sump is sufficiently pre-oiled?
• What could small, bright, metallic particles found in the oil sump indicate?
• What solvent is typically used for degreasing engine parts during overhaul?
• The engine operating flexibility refers to the engine's ability to...
• Why do aircraft engine cylinders typically have a smaller oversize range compared to automobile engine cylinders?
• How are exhaust valves checked for stretch during an overhaul of a reciprocating engine?
• When is engine crankshaft runout usually checked?
• At what point does the piston achieve maximum velocity in relation to TDC?
• What is the primary purpose of a fuel injector in a reciprocating engine?
• What is the function of the piston in a reciprocating engine?
• What role do spark plugs play in a reciprocating engine?
• What is the best indication of worn valve guides?
• What is a common indicator of engine knock?
• Which aspect is critical to monitor to prevent engine detonation?
• Which engine component is least likely to cause vibration if faulty?
• If the oil pressure gauge fluctuates over a wide range from zero to normal operating pressure, the most likely cause is...
• What is the purpose of a safety circlet on some valve stems?
• Which of the following is NOT a factor in establishing the maximum compression ratio limitations of an aircraft engine?
• How is engine efficiency typically expressed?
• What is the principal advantage of using propeller reduction gears?
• What environmental benefit do catalytic converters provide?
• What does the stroke refer to in a reciprocating engine?
• What is the purpose of the crankshaft in a reciprocating engine?
• What is the process by which heat is removed from the engine?
• What are common materials used for engine components?
• Which component is responsible for the engine's timing belt or chain?
• What is a potential consequence of running an engine with improperly set valve timing?
• During an inspection of an engine control system, what should be checked about the threaded rod ends?
• How does a leak in an oil dilution valve affect engine performance?
• Which component of a reciprocating engine is most affected by improper warm-up procedures?
• What is the function of an engine thermostat?
• How is the compression ratio defined in a reciprocating engine?
• How can low oil levels affect engine temperature?
• What does valve overlap promote in an engine?
• After servicing spark plugs from an opposed engine, how should they be reinstalled?
• What may result if the intake valve opens too early in a four-stroke cycle engine?
• What is the role of a starter motor in an engine?
• What is the effect of a well-maintained fuel system on engine performance?
• What is the role of a carburetor in an internal combustion engine?
• What is preignition in the context of engine operation?
• What effect does high engine RPM have on oil within the engine during initial operation?
• What is the primary purpose of a power plant reciprocating engine?
• What is the primary concern in establishing the firing order for an opposed engine?
• Under what condition can a lack of clearance in the valve-operating mechanism of an aircraft engine using hydraulic lifters be expected?
• What are the primary types of reciprocating engines based on configuration?
• What is the purpose of a fuel filter in a reciprocating engine?
• What is the advantage of using metallic-sodium filled exhaust valves in aircraft reciprocating engines?
• What does 'mechanical advantage' refer to in an engine's context?
• What is typically indicated by the condition of spark plugs in a reciprocating engine?
• What is the basic operational sequence for reducing the power output of an engine equipped with a constant-speed propeller?
• Why might a piston not fit properly in a cylinder when the engine is cold?
• What might indicate that the piston is on the compression stroke?
• What role does the engine control unit (ECU) play in modern reciprocating engines?
• What is the term for the actual power delivered to the propeller of an aircraft engine?
• What happens to an unsupercharged aircraft reciprocating engine when operating at full throttle from sea level to 10,000 feet?
• What condition indicates a weak-engine when operating with a fixed-pitch propeller?
• Excessive valve clearances will cause the duration of valve opening to:
• What might happen if hot clearance is used to set valves in a cold engine?
• What effect does a turbocharger typically have on engine performance?
• Which factor is crucial for effective combustion in an engine?
• Which type of engine generally provides higher torque, two-stroke or four-stroke?
• What tool is generally used to measure the crankshaft rotation in degrees?
• When inspecting a reciprocating engine, what is a common sign of combustion issues?
• How does a decrease in air density impact engine performance?
• Define the term 'cylinder head'.
• What is indicated by a slight drop in RPM during an engine ground check when switching the ignition?
• What is a likely cause of a reciprocating engine backfiring through the induction system at low RPM?
• What role does the ignition system serve in a reciprocating engine?
• Which statement is true regarding the compatibility of piston rings with cylinder types?
• What is the purpose of valve timing in an engine?
• Why is it essential to keep the oil clean in a reciprocating engine?
• What is a typical indication of exhaust valve problems during engine performance?
• What does a properly balanced engine minimize?
• Which method is used to harden some cylinder barrels?
• What is a likely consequence of operating a reciprocating engine at high power settings before it is warmed up?
• What is the reason for using cam-ground pistons in certain aircraft engines?
• Which condition requires further investigation in a reciprocating engine?
• What is the main function of the oil system in a reciprocating engine?
• What is the valve clearance of an engine using hydraulic lifters when the lifters are completely flat?
• Why is efficient fuel vaporization critical for engine performance?
• Which bearing is least likely to be a roller or ball bearing?
• Why do some aircraft engine manufacturers use choked or taper-ground cylinders?
• What fuel/air mixture will produce the highest engine temperature?
• What happens to cylinder clearance as an engine heats up?
• What is a common effect of improper valve timing in an engine?
• What does 'blow-by' refer to in an engine?
• How should direct mechanical push-pull carburetor heat control linkages be adjusted?
• What is the primary difference between a naturally aspirated and a turbocharged engine?
• What is a potential outcome of failing to address excessive engine vibration?
• What does a higher octane rating indicate about an engine's performance?
• What is the primary purpose of an exhaust system in a reciprocating engine?
• What main benefit does engine balancing provide?
• What is the total piston displacement of a nine-cylinder engine with a bore of 5.5 inches and a stroke of 6 inches?
• What does engine performance depend heavily on, related to weight?
• In a routine maintenance check on a reciprocating engine, which component is critical for assessing engine performance?
• What is the effect of a clogged crankcase breather on engine performance?
• What does it indicate if the oil pressure of a cold engine is higher than at normal operating temperatures?
• How does the power-to-weight ratio affect vehicle performance?
• What could excessive oil pressure in a cold engine indicate aside from normal operational behavior?
• Why is it inadvisable to soak aluminum and magnesium engine parts in solutions containing soap?
• In the context of reciprocating engines, what does 'fuel economy' refer to?
• What are full-floating piston pins designed to allow motion between?
• What can excessive wear in an engine lead to?
• What are the five events of a four-stroke cycle engine in the correct order?
• What effect does increased water vapor in the incoming air have on a reciprocating engine at a constant RPM and manifold pressure?
• Which of the following is a sign of an overheating engine?
• In an engine, what does BMEP stand for?
• How do reduction gears benefit a propeller?
• During a compression check of a reciprocating engine, what does it indicate if the propeller moves in the direction of engine rotation?
• How does an excessively lean mixture affect engine performance?
• What is the result of a higher manifold pressure in relation to engine performance?
• What is a primary consequence of imbalanced reciprocating engines?
• What is the purpose of the timing belt or chain in an engine?
• What is involved in an engine rebuild?
• What effect does improper clearance have on engine operation?
• What is the primary benefit of regular engine maintenance?
• Which component of a fuel-injected engine is responsible for controlling air intake?
• Why is it crucial to regularly clean the fuel system?
• Which of the following can lead to a decrease in engine efficiency?
• What effect does reducing vibrations in an engine have?
• What is the term for the horsepower developed in the cylinders of a reciprocating engine?
• What does the term 'compression ratio' refer to in an engine?
• What is the purpose of catalytic converters in a vehicle exhaust system?
• What is the main benefit of maintaining proper clearances in an engine assembly?
• Why is balancing important in reciprocating engines?
• Which components are essential in a reciprocating engine?
• How does excessive back pressure affect engine performance?
• What is the primary purpose of gaskets in engine design?
• What happens during the power stroke of an engine cycle?
• During a power check on a reciprocating engine, what is the primary goal?
• What does a hissing sound from the exhaust stacks indicate when the propeller is being pulled through manually?
• To what altitude will a turbocharged engine maintain sea level pressure?
• When is the fuel/air mixture ignited in a conventional reciprocating engine?
• In a four-stroke engine, where should ignition ideally occur for optimal performance?
• Which component's function is directly related to commencing combustion in an engine?
• What is meant by the term 'power-to-weight ratio'?
• When removing an engine cylinder, where should the piston be positioned?
• What is one consequence of insufficient cooling in a reciprocating engine?
• What is the function of an oil pressure gauge?
• How does the crankshaft operate in a reciprocating engine?
• What is the purpose of the camshaft in a reciprocating engine?
• How can a malfunctioning thermostat impact engine temperature?
• What may cause insufficient oil supply in an engine?
• How many degrees of crankshaft travel after ignition does the intake valve open if ignition occurs at 28° BTDC and the intake valve opens at 15° BTDC?
• How does fuel injection compare to carburetion in terms of engine efficiency?
• What does the 14 CFR Part 43 Appendix D require during an annual/100-hour inspection of a reciprocating engine?
• What influences engine displacement in a reciprocating engine?
• What is the key difference between two-stroke and four-stroke engines?
• What happens to fuel during the vaporization process in an engine?
• What happens to the combustion process timing if the engine experiences incorrect ignition timing?
• What condition would most likely lead to detonation in an engine?
• What is the primary function of the piston in a reciprocating engine?
• What can be the result of improper crankshaft rotation during valve timing?
• Why does engine smoothness improve with a greater number of cylinders?
• Why is it important to measure the end gap of piston rings correctly?
• During a ground check, if an engine is rough-running with normal magneto drop and higher than normal manifold pressure, what might be the cause?
• If the volume of a cylinder is 70 cubic inches at bottom center and 10 cubic inches at top of the cylinder, what is the compression ratio?
• How is proper end-gap clearance on new piston rings assured during the overhaul of an engine?
• To what does the term 'combustion efficiency' refer?
• What is ignition timing, and why is it important in engine performance?
• If an engine has both low oil pressure and high oil temperature, what might be a probable cause?
• What does a high oil temperature typically indicate about engine condition?
• Which statement is correct regarding a four-stroke cycle aircraft engine?
• Which engine servicing operation generally requires pre-oiling prior to starting the engine?
• What could cause excessive pressure buildup in the crankcase of a reciprocating engine?
• What is a potential result of grinding the valves to a feather edge in a reciprocating engine?
• What can lead to afterfiring in an aircraft engine?
• What effect does excessive valve clearance have on valve operation?
• What can excessive oil consumption lead to in an engine?
• What is the primary objective of proper valve timing and overlap in an engine?
• What is a common function of a connecting rod in an engine?
• Reduced air density at high altitude has a decided effect on carburetion, resulting in a reduction of engine power by...
• How many degrees will the crankshaft rotate with both the intake and exhaust valves seated?
• What is the purpose of a piston ring?
• During engine operation, what does the term "exhaust" refer to?
• What defines 'idle speed' in an engine?
• Which conditions increase the tendency of an engine to detonate?
• What outcome results from a malfunctioning thermostat?
• Which condition would be the least likely caused by failed engine bearings?
• What is detonation in a reciprocating engine?
• Which statement about fuel/air ratios is true?
• A condition that can occur in radial engines but is unlikely to occur in horizontally opposed engines is...
• The purpose of two or more valve springs in aircraft engines is to:
• What does detonation refer to in an aircraft reciprocating engine?
• What effect does valve overlap have on an engine's efficiency?
• What could improper ignition timing potentially cause in an aircraft engine?
• An increase in manifold pressure with a constant RPM will cause the bearing load in an engine to...
• What can be a potential cause of engine misfire?
• What is the main purpose of checking the engagement of control rods in an engine control system?
• What is the role of valves in a reciprocating engine?
• What is described as an engine misfire?
• Which statement is true regarding bearings used in high-powered reciprocating aircraft engines?
• What special procedure is necessary when adjusting valves of an engine with a floating cam ring?
• Where does the greatest amount of wear occur on the cylinder walls of a normally operating engine?
• Which are the two common types of cooling systems in reciprocating engines?
• What happens to performance if the intake valve closes on the compression stroke?
• What is the function of a knock sensor in an engine?
• How does a floating control thermostat help regulate oil temperature in some reciprocating engine installations?
• How is engine displacement calculated?
• What is the primary function of an alternator in a vehicle engine?
• If air is heard coming from the crankcase breather or oil filler during a differential compression check, what is this an indication of?
• What is the function of moveable counterweights on an engine crankshaft?
• Which characteristic is typical of a thrust bearing used in most radial engines?
• What are the consequences of operating an engine with low oil levels?
• What does a differential pressure compression tester indicate if a cylinder will not hold pressure after rotating the crankshaft?
• Which of the following is a common method for initiating engine overheating prevention measures?
• If the crankshaft runout readings on the dial indicator are plus .002 inch and minus .003 inch, what is the runout?
• What does the process of fuel vaporization achieve in an engine?
• What is a consequence of excessive valve clearance on a cylinder in a reciprocating aircraft 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 could result from operating an overhead valve engine with inadequate valve clearances?
• What does engine timing advance involve?
• When will small induction system air leaks have the most noticeable effect on engine operation?
• What is the function of the valve mechanism in a reciprocating engine?
• How is valve overlap defined in relation to crankshaft travel?
• 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?
• Which of the following factors will decrease volumetric efficiency in a reciprocating engine?
• What could happen if the stop lever is not reached in the HOT position?
• When comparing the operating temperature valve clearance to cold valve clearance in a radial engine, what is the difference?
• What is one of the main functions of the camshaft in a reciprocating engine?
• What should be done if metallic particles are found in the oil filter during an inspection?
• Valve clearance changes on opposed-type engines using hydraulic lifters are accomplished by:
• What is the typical role of the engine block in a reciprocating engine?
• When should the combustion process be completed if the fuel/air ratio is proper and ignition timing is correct?
• During which strokes on a four-stroke cycle reciprocating aircraft engine are both valves open?
• What characteristic defines the dyna-focal engine mounts used in aircraft reciprocating engines?
• An engine misses in both the right and left positions of the magneto switch. The quickest method for locating the trouble is to...
• In a four-stroke engine, what occurs during the power stroke?
• What will be the likely result if the piston ring gaps happen to be aligned when performing a differential-pressure compression check on a cylinder?
• What should be done before starting a radial engine that has been shut down for over 30 minutes?
• What is the effect of excessive valve clearance in a piston engine?
• In terms of performance, what is a high power-to-weight ratio indicative of?
• What does the compression ratio in an engine represent?
• What is one effect of maintaining proper valve timing?
• What is the key difference between spark ignition and compression ignition engines?
• Which advantage does balancing offer to engine components over time?
• What is a harmonic balancer and its function in a reciprocating engine?
• To reduce the power output of an engine equipped with a constant-speed propeller, what should be done first?
• On what cycle do most reciprocating engines operate?
• What occurs during the intake stroke of a four-stroke engine?
• What is typically assessed during a comprehensive engine check of a reciprocating engine?