Heavy Duty Technician Engine Level 2 Practice Test

These questions are part of the practice quiz. Start practicing

• Which term describes the interval when both inlet and exhaust valves are open and improves scavenging?
• Which statement best describes a semi-floating piston pin?
• Cross hatch orientation in a cylinder bore should be set at approximately what angle to aid ring seating?
• Cylinder head retaining studs vs cap screws: which statement is correct?
• A parallel-flow head is defined as:
• How should you remove the vibration dampener?
• Increasing compression ratio generally improves thermal efficiency but increases what risk?
• How do you check block warpage during inspection?
• Which cooling system component stores excess coolant and helps prevent overflow?
• What two aspects should be checked on a camshaft?
• Margin inspection on valves has to be minimum what fraction of new?
• Embeddability is the ability of what component to absorb particle contamination?
• Which fuel characteristic can influence the pour point?
• Which notation is used to explain companion cylinders and their strokes in a multi-cylinder engine?
• Secondary balance refers to the balance achieved when which condition applies?
• Pour point is defined as the temperature at which a fluid ceases to pour.
• A truck sits overnight after a service and won't start in the morning; what may be the issue?
• What material are crank shafts typically made from?
• What is a vibration damper?
• What is a flywheel?
• What is the recommended cross hatch angle of a cylinder bore?
• Which outcome is associated with higher compression ratio?
• Which statement best describes the cross-flow vs parallel-flow head layouts?
• Which outcome results directly from combustion in a diesel engine?
• Valve overlap is defined as which?
• Which feature characterizes a tunnel-bore block?
• Why are steel spacer plates placed between the block and head?
• What does combustion energy become in an engine?
• What happens when you machine the block deck surface?
• Which statement correctly links cloud point to fuel behavior at low temperatures?
• Cylinder Heads are described as performing which function?
• The engine block is?
• Which preparatory action helps prevent piston ring damage during piston removal?
• Cavitation in an engine cooling system is caused by the breakdown of what?
• BDC stands for which piston position?
• Most wear in a cylinder occurs at which location?
• Black smoke from your DPF indicates system isn't working properly.
• What direction are inline engine blocks numbered with respect to the flywheel?
• Which statement best describes the role of front and rear seals?
• Plugged fins on an air-to-water aftercooler may cause which condition?
• Cam followers: which factor is essential due to thermal expansion?
• In a semi-floating pin arrangement, which component is fixed to the connecting rod?
• Which bearing can outlast two sets of main bearings?
• During the disassembly of main bearings, what should you mark to ensure correct reassembly?
• Liner O-rings prevent coolant from leaking into which fluid?
• Which statement describes an over-sized bearing?
• During cylinder head bolt removal, which statement is true?
• If cylinder wear is significant, which maintenance option may be performed?
• What happens to energy from combustion in an engine?
• Blocks can be categorized by which factor?
• Interference fit liner is described as which of the following?
• What are the three piston rings?
• Which action is part of bleeding air from a diesel fuel system?
• What are the functions of piston rings?
• Which action is commonly performed before starting a rebuilt engine?
• Mono-therm pistons are forged and have which characteristic?
• What is the typical diesel engine thermal efficiency range?
• During valve seal installation, which practice helps avoid damage?
• Which symptom most strongly indicates a head gasket leak?
• Which statement describes the effect of removing margin during valve refacing?
• What is a ladder-frame block?
• Oil sample shows high copper/aluminum. What could be the cause?
• Which action is recommended during the initial run-in of a rebuilt engine?
• To remove a vibration damper, which tool should be used?
• Glow plugs are used on which type of diesel engine?
• Cloud point is best described as which of the following?
• Which formula correctly expresses the displacement for a single cylinder?
• What is the primary purpose of the front and rear seals in the engine?
• The space between crank throws in an inline engine is 120 degrees.
• Pour point is the temperature at which a fluid ceases to pour.
• Which statement about cloud point is true?
• Where is the piston positioned for removal?
• Which condition best explains moisture contamination when fuel tanks are left empty overnight?
• Crankshaft journals are usually hardened to improve what?
• What is the primary purpose of steel spacer plates between the block and head?
• What should you do after rebuilding an engine?
• For slip fit liners, where does the liner flange sit?
• Excessive valve lash causes what effect on valve timing?
• Pistons are usually made from which material?
• Which expression correctly represents the total engine displacement for N cylinders?
• Before removing pistons, what preparatory step should be performed to prevent piston ring damage?
• Fretting is caused by movement in which components?
• A twisted O-ring may cause which issue?
• A cross-flow cylinder head is characterized by which port arrangement in an inline engine?
• What is the offset on piston rings?
• What is the purpose of the heat resistant graphite anti-scuff coating on the piston skirt?
• What two items are checked on a camshaft to assess its condition?
• Which property allows diesel fuel to deliver more heat per gallon (less water, more heat)?
• Which notation is used to explain companion cylinders and strokes in a multi-cylinder engine?
• What issue can arise from a twisted O-ring?
• Where do you measure cam-ground pistons?
• Which storage method is recommended for a crank shaft?
• In an inline engine, the crank throws are spaced at what degree?
• Stroke: What does stroke refer to in an engine?
• CR = (Vd + Vc) / Vc. What is the divisor?
• What is the first step in a Detroit Diesel tune-up?
• What is the primary sign that a crankshaft may need replacement?
• How does increasing flattening of a plastigauge affect bearing clearance?
• What is the key differentiator between ladder-frame and tunnel-bore block designs?
• Which feature defines a deep-skirt block?
• What is the typical volumetric efficiency range for a naturally aspirated diesel engine?
• 1-D fuel is associated with which condition?
• What clearance should a rotor-type pump have?
• Which description best defines liner cavitation?
• What could happen if too much material is removed from the cylinder head during machining?
• A reverse-flow head is described as:
• When you machine the block top deck, what else must be done?
• When inspecting a block, what should you check for?
• Which type of diesel fuel pump is most commonly used?
• Slipper pistons are used in which engines and are made from what material?
• Which statement about cetane rating is true?
• Heating fuel is used for which of the following systems?
• Nicolas Otto developed the four-stroke diesel engine in 1861. In which year is this development attributed?
• What is the function of the main bearing bore?
• Companion cylinders are defined as what?
• Turbocharged diesel engines typically have volumetric efficiency above what percentage?
• Compacted Graphite Iron cylinder heads are generally described as:
• Which statement best describes cavitation in engines?
• What is the purpose of O-rings in engine assemblies?
• When replacing the ring gear on the flywheel, what is the recommended procedure?
• What happens when valve spring tension decreases as spring height increases?
• How many cylinders are in a typical inline-six engine?
• In a six-cylinder inline engine, which cylinder pairs are considered the paired cylinders for balancing?
• Which statement best describes ladder-frame blocks?
• What is the main advantage of cylinder liners?
• Which statement describes an undersized bearing?
• If a diesel engine has low fuel pressure due to suction-side restrictions, which component is most likely the issue?
• Boiling air bubbles in the coolant reservoir may be caused by which fault?
• What is the cloud point?
• In an inline engine, the crank throws are spaced at which angle?
• Which statement best defines the cloud point?
• Which part of the crankshaft is typically hardened to improve wear characteristics?
• In heavy-duty diesel engines, the EGR valve is used to reduce which pollutant?
• Which statement describes a cylinder head's function?
• Choose the statement that correctly describes a typical use of heating fuel.
• Bore: What term describes the diameter of a cylinder?
• Oil accumulating in the exhaust piping or manifold of a diesel engine can be caused by _____?
• 2-D fuel is characterized by which property?
• How can a misaligned main bearing bore be corrected?
• Which engine type has higher compression ratios?
• Which piston type is described as a two-piece construction with a movable head?
• What is the firing order for an inline six-cylinder engine?
• Slip fit liners are defined by what feature?
• In heavy-duty systems using CNG or Propane, what is required?
• CNG is stored at what PSI?
• A vibration damper is defined as which of the following?
• Why should frost plugs be removed during engine block servicing?
• A restricted fuel filter can cause what symptom?
• In a cross-flow cylinder head, why is valve adjustment important?
• Which statement describes a deep-skirt block?
• When should a viscous dampener be replaced?
• Wet sleeve liners are characterized by which statement?
• Piston ring gaps should be checked at which location?
• During valve removal, what method can be used to loosen the valve locks?
• Compared to dry liners, wet liners are in direct contact with what?
• When should a crank shaft be replaced?
• What does embeddability refer to?
• Pour point is defined as?
• Primary balance in an engine is achieved when the crankshaft counterweights offset what?
• Cylinder head bolts should be removed by:
• What would cause exhaust to be present in the cooling system?
• Heating fuel is used for which of the following systems?
• What is a cross-bolted block?
• What is the recommended storage method for a crank shaft?
• The torque turn is important because:
• After replacing the transfer pump, how should you bleed the fuel system?
• What is the pour point?
• Excessive bearing clearance will be shown when plastigauge isn't flattened enough.
• Which statement about pour point is true?
• Best time to fuel up your truck/machine?
• Which fuel produces the most heat (BTU)?
• Under what condition is the engine block removed?
• Most engine blocks are made from?
• The extent of wear on a cylinder determines whether the cylinder should be honed, bored out, or new liners installed. Which statement best reflects this?
• Which statement describes cross-bolted blocks?
• What is B-100?
• Diesel fuel is rated by which characteristic?
• When should a viscous dampener be replaced?
• Which statement correctly describes an interference fit liner?
• Which of the following is a typical consequence of a loose suction-side fuel filter or fitting?
• Which block design forms the main bearing bores and the block into one solid structure for maximum rigidity?
• Which piston type is typically described as a trunk, one-piece design?
• Which statement is true about slipper pistons?
• Engine displacement is defined as what?
• Which type of injection system typically uses glow plugs?
• To bleed air after a fuel pump replacement, which action is used?
• What problem occurs when tanks are left empty all night?
• Which statement best describes wet liners?
• Which piston type is forged with no skirt?
• Which of the following is not a low-temperature fuel property term?
• In a worn cylinder, wear is most likely concentrated in which area?
• Pressurizing the cooling system raises which property?
• Inline engine blocks are numbered from which end?
• What do you use when installing seals?
• What is a commonly cited benefit of an overhead cam?
• If you suspect a cylinder liner is leaking into the oil pan, what is the correct diagnostic step?
• If there is an air pocket in a dry fit liner, what may occur?
• What best describes a wet liner?
• What does Cetane rating measure in diesel fuel?
• If valves are refaced so the margin is eliminated, what will happen?
• Which symptom best indicates a plugged air-to-water aftercooler?
• Machining the main bearing bores of a crankshaft typically decreases which dimensions?
• Which component is the primary source of high chromium in an oil sample?
• Cetane rating indicates what?
• What is applied to a piston skirt to reduce friction?
• How many full rotations of the crankshaft are required to complete a combustion cycle in a four-stroke engine?
• Which action is recommended after engine rebuilding before a load test?
• Filling and scavenging is more efficient with which head configuration?
• Major thrust location for a clockwise turning engine viewed from the front pulley?
• Which three piston rings are listed in the material?