EETC Four Stroke Engine Certification Practice Exam

Browse all practice questions for the EETC Four Stroke Engine Certification Practice Exam. Search by topic, open any question and review its full explanation, then test yourself in the practice quiz.

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Discover how the air cleaner keeps your engine running smoothlyWhat component is designed to ensure an engine receives clean air?Discover What Makes Oil Control Rings Essential for Your EngineWhat is the primary characteristic of oil control rings?How advancing armatures affect ignition timing and kickback in small four-stroke enginesDoes the installation of an advancing armature instead of a standard armature have the potential to cause kickback?The Role of Venturi Effect on Air Pressure in CarburetorsWhat effect does the carburetor venturi have on air pressure?Understanding Parasitic Loads in Four Stroke EnginesWhat is defined as a parasitic load on an engine?Understanding Surging in Engine Speed: What You Need to KnowWhat is surging in relation to engine speed?Understanding the Consequences of a Fuel System Leak on Engine PerformanceWhat does a fuel system leak commonly result in?Understanding the Crankcase Breather System for Your EngineWhat is the primary function of a crankcase breather system?Understanding the Critical Role of the Oil Control Ring in Your EngineWhat is the role of the oil control ring in an engine?Understanding the Electronic Control Principle Behind EFI SystemsWhat principle does an EFI system primarily operate under?Understanding the Essential Role of the Crankcase in Four-Stroke EnginesWhat is the primary function of the crankcase in an engine?Understanding the Impact of Oil Contamination on Engine HealthWhat is typically true about contamination build-up in engine oil?Understanding the Importance of Octane Rating in Fuel PerformanceWhat describes a fuel sample's ability to resist knock and ping?Understanding the Visual Signs of Lubrication Failure in EnginesWhat visual clues might indicate lubrication failure?Understanding the Voltage Scale Used in EFI Engine SensorsWhat voltage scale do most EFI engine sensors utilize?Understanding Thermal Growth and Its Impact on Engineering DesignsWhat is thermal growth?What does the flywheel do in a four-stroke engine, and why does it matter?What is the primary role of the flywheel in an engine?What resists expanding gases against the cylinder wall during the power stroke in a four-stroke engine?During the power stroke, what acts against the cylinder wall due to expanding gases?Why diodes sit between ignition coils in a V-twin engine’s kill circuitWhat electrical component is commonly used in the ignition kill circuit between each ignition coil in a V-twin engine?Why hunting and surging under load point to the carburetor system in a four-stroke engineHunting and surging under load indicates a problem with the __________.Why the highest compression ratio isn’t required in four-stroke enginesIf the compression of the charge and resultant heat break apart fine droplets of gasoline, what should all 4-stroke engines exhibit?
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  • What is the typical consequence of using too high an ethanol blend in small engines?
  • What process can lead to the formation of a viscous material like tar in engine oil?
  • A fuel tank that is overfilled typically causes which issue in an engine?
  • In a typical ignition system, the spark plug is part of which circuit?
  • Increasing the air speed in a carburetor venturi primarily affects which property of airflow?
  • An engine that "hunts" or has unstable rpm is most likely to have:
  • What is a common characteristic of a well-functioning engine?
  • The flash point of a fuel is best described as?
  • What is the typical way you should start to test the charging system with a complaint of no battery charging?
  • Which of the following can cause premature wear due to abrasive ingestion?
  • What is meant by piston ring end gap?
  • What typically needs modification at higher altitudes for most engines?
  • What is the primary purpose of a fuel cutoff solenoid in some carbureted engines?
  • Does heat flow from areas of lower temperature to higher temperature?
  • What type of fuel line is commonly used in modern small gas engines?
  • Is the ground circuit between the ignition armature lamination stack and the spark plug a common area for trouble?
  • In regions with large climate changes, fuel blends are altered to aid in what aspect of engine operation?
  • What do burned oil deposits underneath the piston crown primarily indicate?
  • How are intake and exhaust valves primarily cooled?
  • An engine that runs rich after carburetion service could have which issue causing the problem?
  • What is the main purpose of the piston crown in an engine?
  • Most manufacturer's warranty cover repair expenses only for failures due to defective materials and/or workmanship.
  • When does maximum valve overlap occur in an engine?
  • What function do the needle and seat perform in a float bowl type carburetor?
  • What is the purpose of measuring AC voltage output at the stator with the engine running?
  • What is the purpose of the taper on the crankshaft that matches the taper on the flywheel hub?
  • Is alcohol added to gasoline to adjust the Reid Vapor Pressure?
  • What is the most likely cause of excessive engine vibration?
  • In which position should the speed control be set when adjusting the governor?
  • What is the poisonous gas produced by internal combustion engines?
  • Why do spark plugs wear over time?
  • A carburetor's venturi increases air speed and reduces which of the following?
  • What effect can variable ignition timing have on engine performance?
  • What condition may arise if regular oil changes are not performed?
  • What type of connector is typically used in the ignition circuit to prevent backfeed?
  • How does overheating typically affect engine components?
  • What is the second variation of 4-stroke engines aside from Vertical?
  • Hunting and surging problems can occur at idle, top no-load speed, and under load.
  • Which of the following can cause engine overheating?
  • Why do connecting rods in V-twin engines share the same crankpin journal?
  • What is typically the relationship between temperature and fuel volatility?
  • What benefit does variable ignition timing provide to engines?
  • A no-oil startup occurs due to which reason?
  • Which of the following is NOT a recognized function of engine oil?
  • When selecting engine oil, what is the most reliable approach to use?
  • Which ring is responsible for preventing the majority of expanding combustion gases from escaping into the crankcase?
  • What does Reid Vapor Pressure measure in fuels?
  • What can be the consequence of excessive bearing clearance?
  • Technician A says that 10% Ethanol (E10) is acceptable for modern small engines. Technician B states that 15% Ethanol (E10) is acceptable. Who is correct?
  • Most particles that cause premature wear in engines enter through which system?
  • Most valve seats used on 4-stroke engines are at what angle?
  • What is the primary purpose of a carburetor?
  • Which component is primarily responsible for the airflow into the cylinder during the intake stroke?
  • When an engine operates correctly and creates satisfactory power under load but not at partial load, the __________ are not at fault.
  • Which of the following significantly affects the performance of a fuel system through vapor lock?
  • Which ratio indicates the most efficient combustion occurring?
  • What is the purpose of the engine date code?
  • To adjust the governors on engines equipped with a governed idle setting, what should be set before the governed idle speed?
  • What condition of the fuel in an EFI system is primarily managed via O2 sensors?
  • What is the purpose of changing governor arm length?
  • For every revolution of the crankshaft, how many revolutions does the camshaft complete?
  • Which expands faster, cast aluminum or cast iron alloy?
  • What might a leaking head gasket cause?
  • What ethanol content is modern small engine fuel delivery systems calibrated for?
  • What best describes vapor lock in a fuel system?
  • An engine exhibits hunting and surging at idle and top no-load speeds but not under moderate loads. What is the most likely cause?
  • What type of engine system relies on pressure to circulate oil throughout the engine?
  • Excessive piston to cylinder wall clearance will cause:
  • Which part of the piston experiences the most thermal expansion?
  • Is the governor spring directly connected to the throttle plate?
  • An engine with a mechanical governor runs too fast. Technician A says that the governor is damaged. Technician B says to remove the governor spring and start the engine. Who has the best advice?
  • Is it true that normal and acceptable leakage of compression gasses is greater than leakage caused by alignment of unworn piston ring end gaps?
  • Which engine stroke is characterized by the compression of the air-fuel mixture?
  • Do idle and high-speed circuits in carburetors contribute to total fuel delivery during mid-range operation?
  • What component controls the timing of the engine's valves?
  • If abrasives get past the air filter, where will they travel next?
  • Mechanical idle stops will always be set to a higher speed than what?
  • What type of pump is commonly featured in most pressure lubrication systems of 4-stroke engines?
  • Warranty for engines will usually start from what point?
  • Can an advancing armature cause issues in engine operation?
  • What stroke follows the exhaust stroke in a 4-stroke engine cycle?
  • A completely blocked high speed air bleed will cause an engine to run rich under load. Is this statement true or false?
  • In an EFI system, what does Closed Loop operation rely on?
  • Which of the following is NOT a likely symptom of lubrication issues in an engine?
  • In fuel combustion, what fraction of engine power is typically required to overcome friction?
  • An engine with a high compression ratio requires which type of fuel?
  • How does heat transfer from the piston head to the cylinder walls?
  • Governor sensitivity is determined by which factor related to the governor arm?
  • What condition does a bent crankshaft most likely lead to?
  • Is the American Petroleum Institute (API) rating useful for determining a motor oil’s viscosity?
  • What provides inertia to keep the engine running?
  • To complete one operating cycle, how far must the crankshaft of a 4-stroke engine rotate?
  • Which part of the piston can lead to increased oil consumption if worn?
  • What tool is used to check the specific gravity of a battery electrolyte?
  • What role does oil play in the cooling system of an engine?
  • What component is used to govern the fuel delivery during acceleration in a two-stroke engine?
  • True or False: Twin barrel carburetors often have different jet sizes in one barrel compared to the opposite barrel.
  • What is the optimum fuel/air ratio for gasoline?
  • Which property of engine oil primarily affects its ability to lubricate effectively?
  • Which factor can contribute to high oil consumption in an engine?
  • When does the warranty on an engine begin?
  • Which governor system achieves the most precise control of proper engine RPM?
  • A pilot jet in a carburetor provides what?
  • During which phase of the engine cycle does the intake valve open?
  • The job of the air cleaner is to do what?
  • What information should you obtain prior to looking up a specific engine part?
  • What is the effect of wear on the valve seats in an engine?
  • What component in the fuel system helps manage fuel flow during an engine shutdown?
  • Why is carbon monoxide considered dangerous?
  • Which hydraulic device is often used to control engine speed in lawn equipment?
  • As the face of the oil control ring wears, how do the contact points change?
  • Are magneto style ignition coils directional when mounted on the engine?
  • Which component of a battery is crucial for starting an engine?
  • The dealership has the choice of using genuine parts or non-original parts for all warranty repairs.
  • Which component in a carburetor is essential for controlling the speed of the engine?
  • What does most manufacturer's warranty policies cover?
  • Automatic choking systems are designed to mimic which type of starting conditions?
  • When should safety glasses be worn?
  • Which symptom is likely when an engine with a pneumatic governor has plugged cooling fins?
  • What does the O2 sensor in an Electronic Fuel Injection System report?
  • For warranty coverage, the engine is generally protected against what types of failures?
  • What does the bottom ring on a four-cycle engine primarily control?
  • Which symptom besides oil consumption indicates excessive ring and/or cylinder wear?
  • What is most EFI ignition systems' source of power?
  • What temperature is a 12 Volt battery CCA typically described for?
  • Which statement is true regarding an engine's longer stroke?
  • In an Electronic Fuel Injection (EFI) system, what does open loop operation do?
  • What can be a potential sign of a clogged air filter in an engine?
  • Which two types of cylinder wall finishes are common in 4-stroke engines?
  • Which factor does NOT contribute to the efficiency of a carburetor?
  • What is a common issue associated with a blocked idle circuit air bleed?
  • What is the main reason most pistons are designed to be elliptical?
  • If the oil is not changed on a routine basis, what will continue to build up until sludge begins to form?
  • Heat always flows between areas of temperature in which direction?
  • A fairly common ignition system problem experienced with engines powering rotary lawn mowers is __________.
  • Why is it important to make a static governor adjustment after engine component reinstallation?
  • Is gasoline blended for winter use more volatile than gasoline blended for summer use?
  • Prior to engine disassembly, what should be checked?
  • What aspect of engine performance does valve overlap primarily enhance?
  • A bent crankshaft can lead to which issue?
  • How can tighter valve lash than specified affect an EFI engine?
  • What happens to a fully regulated charging system if a battery has less than 4 volts?
  • What device typically experiences issues resulting in an engine running rich under certain conditions?
  • What component is MOST likely to fail due to heat deterioration?
  • Extreme cases of overheating may cause which component to loosen?
  • The narrower the valve margin, what impact does it have on valve life?
  • Cylinder bore damage that is more pronounced near the top suggests which possible issue?
  • Which component and cover serve as the main supports for the crankshaft?
  • An engine that runs fine for 5 minutes and then stops, but restarts after 2 minutes may indicate what condition?
  • What occurs to the throttle plate when the ignition switch is turned off during engine operation at top no-load speed?
  • What performance benefit does a governed idle feature provide in an engine?
  • How quickly must a rotary lawnmower's blade stop when the operator leaves the operating zone?
  • What is the effect of a lean fuel mixture on engine performance?
  • What is the result of excess torque in an engine?
  • A sheared flywheel key on a walk behind mower is most likely the result of what?
  • What is typically a sign of a clogged fuel filter?
  • If an engine experiences a sudden rise in speed when operating with a pneumatic governor, what could be the cause?
  • What is the role of a regulator/rectifier in a charging system?
  • What is the consequence of using oil with too low of a viscosity in a 4-stroke engine?
  • What adjustment is needed after reinstalling the carburetor, crankcase cover, or oil sump?
  • If the connecting rod is discolored and the crankpin shows metal transfer, what is the most likely cause?
  • How does the governor spring influence the throttle plate when the engine operates?
  • Which system is utilized to minimize emissions in modern engines?
  • What component serves to restrict oil from reaching the combustion chamber?
  • If the customer does not have a copy of the original purchase receipt, what should the dealer use as the default purchase date?
  • It is highly unlikely that an armature air gap set too wide will prevent an engine from starting and running.
  • Is laying the spark plug on the engine block and operating the starter an adequate way to check ignition armature output?
  • What happens to the compression ratio of an engine with a large volume of combustion deposits?
  • Which component in an engine transitions from low speed to high speed circuits?
  • What are common types of governors found in small engines?
  • Does the engine’s efficiency typically increase with a correct fuel/air ratio?
  • What is the purpose of the top piston ring in a 4-stroke engine?
  • If the flywheel key shears on an engine with an ignition armature, what happens to the spark?
  • When should a torque wrench be used according to the repair manual?
  • What adjusts to match the anticipated temperature in an area or region regarding gasoline?
  • The air-fuel ratio in a carburetor mixture is represented by what?
  • Which statement is true regarding an engine with Tier III Emissions compliance?
  • A common issue with an engine that exhibits vibration may be related to?
  • Do piston rings rotate around their grooves during operation?
  • What is one of the reasons alternators were added to engines?
  • For proper high-speed operation, when should the ignition process begin?
  • Which issue could result from incorrect oil viscosity in an engine?
  • Which factor primarily affects the vaporization of fuel in a carburetor?
  • What is the purpose of fuels listed as "oxygenated"?
  • What is the BEST type of engine lubricant recommended for 4-stroke engines?
  • What is the effect of high ethanol content in fuel on small engine performance?
  • Which ring provides a controlled film of oil to lubricate the compression ring?
  • Which type of wear failure is caused by lubrication film that is too thin for proper separation?
  • What is the most likely cause for a V-twin magneto style ignition engine not shutting off with the switch in the "OFF" position?
  • As the spark plug center electrode wears down, what happens to the voltage required to fire the plug?
  • The middle ring is commonly referred to as which type of ring?
  • During the ignition cycle, at what point should the spark occur ideally for efficient combustion?
  • How does changing the air-fuel ratio affect engine performance?
  • Which part of the ignition system is responsible for generating a high voltage spark for ignition?
  • When the engine is not running, what is the only force on the throttle shaft?
  • What effect does proper lubrication have on piston operation?
  • Because the governor is constantly adjusting the throttle plate position in response to changing engine load, you would expect the __________ will wear out considerably faster than the choke shaft.
  • How can excessive engine noise be indicative of a problem?
  • Is the octane rating of a fuel a good indicator of its power delivery during oxidation?
  • What is one of the primary functions of the O2 sensor in an EFI system?
  • In today's factories, most critical fasteners are tightened using what procedure?
  • Engine valve overlap is most beneficial at which point?
  • What is a principal cause of valve failures in engines, along with burning?
  • The loss of cross-hatch appearance in a cast iron cylinder bore indicates what condition?
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