Tractor Technician Contest Practice Test

These questions are part of the practice quiz. Start practicing

• Which component seals the joining surfaces of a cylinder and its head?
• Burned or pitted valves can be caused by which condition?
• The purpose of a flywheel on an engine is to provide a ring gear for the engine starting motor to contact.
• Which condition is most likely to cause valve burning?
• What is a typical result of restricted radiator flow in a diesel tractor?
• Which of the following statements is true?
• If a diesel engine experiences hard starting in cold conditions, which circuit is most likely at fault?
• Which statement describes a purpose of engine oil?
• Which specification is required to estimate drawbar power for a six-bottom moldboard plow?
• Which diagnostic sequence best confirms worn piston rings as a cause of high oil consumption?
• An accumulator is a GPS device used in precision agriculture applications.
• What is the primary function of an overrunning clutch?
• When sizing a tractor for a six-bottom moldboard plow, the drawbar power of the tractor is a necessary factor.
• Which combination of factors is necessary to determine the power to pull a six-bottom moldboard plow?
• Which statement about piston rings is correct?
• The purpose of a flywheel on an engine is to act as a balancer for the engine.
• What is the purpose of Exhaust Gas Recirculation (EGR) in tractors and what would indicate a problem?
• The number of amperes a battery can deliver at 0 degrees for 30 seconds is defined as reserve cranking capacity.
• The SAE establishes standard dimension and pin sizes for implement hitches.
• Fittings with NPT threads are recommended for high-pressure hydraulic systems.
• Which statement about faulty injectors is true?
• Cylinders are deglazed (crosshatched) to provide cavities for holding oil during piston ring break-in.
• Width of cut refers to the amount of material removed per pass in machining.
• What is a typical indicator that the tractor cooling system thermostat is functioning properly?
• Adding water with a high mineral content, such as calcium or iron, does not affect the life or performance of a wet-cell storage battery.
• Backlash refers to the clearance between which components?
• Which of the following statements is true?
• Checking camshaft gear backlash with a telescoping gauge is a valid method.
• Worn valve guides may be brought into specifications by reaming the guides and installing valves with oversized stems.
• What is the difference between open-center and closed-center hydraulic systems on tractors?
• Why is using the correct oil grade important in a diesel tractor engine?
• In hydraulic systems, what effect does flow through an orifice or restriction typically have?
• Which statement about valve guides is correct?
• Torque is equal to the force on a lever multiplied by the length of the lever.
• Using a telescoping gauge and/or small hold gauge and a properly sized micrometer, you can check valve guide wear in an engine to determine if they are within specifications.
• In a hydraulic schematic, a circle indicates a pump or motor.
• Each cell in a storage battery has approximately 2.2 volts.
• A bent armature shaft can cause dragging armature.
• In a hydraulic system, what is the purpose of the relief valve?
• For efficient combustion in diesel engines, the air–fuel ratio can be as high as 40:1.
• What is a bypass oil filter and why might it be used on some tractors?
• Which statement about piston rings is true?
• One must know the size (width of cut) of each bottom.
• Impedance can be defined as internal resistance to current flow.
• Which statement describes the typical PTO speeds on modern tractors and their common applications?
• Seat belts should always be worn when operating tractors equipped with ROPS.
• Plastigage can determine ring groove clearance.
• Which component helps regulate oil flow in a bypass filtration system?
• Hazards with the highest probability of serious injury or death are marked with black and yellow decals with the word 'warning'.
• A dragging armature may be caused by a bent armature shaft.
• Which combination of factors is necessary to determine the drawbar power for a six-bottom moldboard plow?
• In hydraulics, what does load sensing do to optimize efficiency?
• The induction of voltage in one coil by changing current in an adjacent coil is called mutual induction.
• The brushes on an alternator should be held retracted by a pin during reassembly.
• What is the purpose of quick-connect hydraulic hose couplers on tractors?
• Drawbar horsepower can be negative depending on load and speed.
• Plastigage can be used to determine ring groove clearance.
• In the hydraulic systems of agricultural equipment oil is drawn into the inlet side due to suction created by the pump.
• What DEF-related condition can trigger derates or shutdown on Tier 4 tractors?
• To determine stem-to-guide clearance, which method is correct?
• What is the function of an automatic belt tensioner in a belt-driven system?
• Which of the following statements is true?
• Why is proper belt tension important on a tractor drive belt?
• What maintenance action can bring worn valve guides back into specification?
• With a telescoping gauge and/or small hole gauge and a properly sized micrometer, you can check camshaft gear backlash.
• A dragging armature may be caused by worn bearings.
• Which of the following statements is true?
• What are common symptoms of a faulty glow plug circuit in a diesel tractor?
• What is a common method to diagnose an intake vacuum leak on a tractor engine?
• A dragging armature may be caused by worn pole shoes.
• What is the purpose of a scan tool in tractor diagnostics?
• When servicing an accumulator system in a hydraulic circuit, you should remove all hydraulic pressure first.
• Which sequence is recommended when disconnecting cables from alternators or batteries for service?
• In a four-stroke engine, the intake valve closes before the piston reaches bottom dead center on the intake stroke.
• Which of the following statements is true?
• What is a deadhead condition in a hydraulic pump, and what are typical symptoms?
• A single acting hydraulic cylinder is capable of applying hydraulic force in both directions of travel.
• Which of the following statements is true?
• An overrunning clutch engages when the drive shaft rotates in one direction, and allows the driveshaft to freewheel in the opposite direction.
• Which of the following statements best describes a function of engine oil?
• What steps are part of a preventive maintenance check of a tractor cooling system?
• Under the condition of pulling a 3000-pound load at 4.5 mph, which draw-bar horsepower is reported?
• How would you diagnose a hydraulic pump that is cavitating and making loud noises?
• What is the purpose of a transfer case in a four-wheel-drive tractor?
• When diagnosing a lack of hydraulic flow from the control lever, which steps should you perform?
• Which of the following statements is true?
• Drawbar horsepower measures the power transmitted through the drawbar to the trailer hitch.
• What is a viscous fan clutch and how does it control cooling in tractors?
• Why is the relief valve setting important in a hydraulic system?
• In hydraulic systems of agricultural equipment, force is calculated by multiplying pump flow in GPM by the area of the piston.
• Differentiate between gear-type and hydrostatic transmissions in tractors.
• Which measurement would you perform with a telescoping gauge and micrometer to assess wear?
• Which procedure best describes performing a coolant system pressure test on a tractor?
• With a telescoping gauge and/or small hole gauge and a properly sized micrometer, you can check crankshaft-to-bearing journal running clearance.
• Unplanned restrictions in lines or hoses can cause fluid to overheat.
• Which of the following statements is true?
• In low voltage DC circuits (50 V or less), which color insulation is generally used for ground wires?
• The purpose of a flywheel on an engine is to provide a surface from which the clutch can pick up torque from the crankshaft and transfer it to the drive train.
• What might high oil consumption indicate and what checks would you perform?
• Which statement describes a function of piston rings?
• Batteries connected in series produce twice the voltage at the same amperage.
• Why might backflushing be performed when checking radiator flow?
• In hydrostatic steering systems, there is no mechanical linkage between the steering valve and the steering cylinder.
• What is the role of a hydraulic pressure relief valve in a tractor hydraulic system?
• An accumulator is a piece of GPS equipment used in precision agriculture applications.
• Plastigage can be used to determine piston to linear clearance.
• What is the function of a tractor alternator and a voltage regulator?
• Which diagnostic method helps identify leaks in the intake vacuum system?
• The joining surfaces of a cylinder and a head are sealed, using a gasket.
• Bar magnets generate invisible lines of force known as magnetic flux between their poles.
• To convert inch-pounds to foot-pounds, you multiply by 12.
• What is the purpose of testing radiator cap pressure during radiator flow checks?
• Cavitation erosion is the same as chemical erosion within the coolant system.
• What is the purpose of a diesel fuel-water separator and how does it operate?
• Which statement is true about injector problems?
• Which statement accurately describes a typical fuel-water separator on a diesel tractor?
• How do you perform a compression test on a diesel tractor engine, and what readings indicate healthy cylinders?
• Inch-pound of torque can be converted to foot-pounds by multiplying by 12, since there are 12 inches a foot.
• Voltage regulators on tractors function to regulate system voltage.
• Which statement describes a characteristic of a bypass oil filter's function?
• Which of the following can be caused by faulty injectors?
• Seat belts should always be worn when operating tractors equipped with ROPS.
• Why is proper timing belt/chain tension critical in tractor engines?
• To determine the correct engine oil viscosity and specification for a tractor, which source should you consult?
• In a compression test, which instrument is used to measure cylinder pressure?
• Plastigage is a simple method to measure bearing clearance by compressing a plastic thread between bearing surfaces.
• Normally, reassembling an alternator requires that the brushes be held in the retracted position by a pin until they are positioned over the slip rings.
• In DC circuits of 50 V or less, which insulation color is generally used for ground wires?
• Backlash is defined as the clearance between two meshed gears.
• Which of the following statements is true?
• To determine the proper-size tractor to pull a six-bottom moldboard plow, one must know the drawbar power of the tractor being considered.
• Plastigage can be used to determine crankpin and main bearing running clearance.
• Which of the following is not a purpose of engine oil?
• A faulty injector is a common cause of excessive smoke in diesel engines.
• A starting motor produces relatively high horsepower in relation to size, and is designed to operate for extended periods of time.
• Hazards with the highest probability of serious injury or death are marked with black and yellow color-coded safety decals marked with the letter 'C'.
• Which of the following statements is true?
• When repairing a hydraulic component, the recommended procedure is to replace only the damaged and leaking seals.
• Knowing the width of cut is essential when planning machining operations.
• What is the primary function of the cylinder head gasket in a diesel tractor engine?
• A dragging armature may be caused by a faulty starter drive.
• Which factor is essential when sizing a tractor for plowing a six-bottom moldboard plow?
• The primary purpose of a hydraulic pump is to create pressure in the system.
• If the cylinder head gasket fails, which issues are most likely to occur?
• Where is a coolant temperature sensor typically located and what does it do?
• How should you interpret a tractor wiring diagram when diagnosing electrical issues?
• A telescoping gauge can be used to measure crankshaft bearing journal running clearance.
• To a service technician troubleshooting a hydraulic system, the operating temperature of the system has no effect on performance.
• What is the purpose of deglazing cylinders?
• How do you safely disconnect and reconnect hydraulic hoses to minimize spillage and contamination?
• Many diesel emissions after-treatment systems require the use of DEF.
• Which of the following is a sign of a failing fuel injector in a diesel tractor?
• During a diesel engine compression test, what does a uniform set of readings across cylinders indicate?
• In the hydraulic systems of agricultural equipment force is exerted by a hydraulic cylinder is calculated by multiplying pump flow in GPM by the area of the piston.
• What condition would indicate a faulty radiator cap during a coolant pressure test?
• Which measurement can be checked using a telescoping gauge and a micrometer in an engine?
• Name common PTO clutch types found on tractors and their basic operating principle.
• What is the function of the thermostat in a tractor cooling system?
• How does hydraulic fluid viscosity affect performance in cold weather?
• Which description of mutual induction is correct?
• What is the purpose of a fuel filter with water separator and how do you drain it?
• What is the importance of following a torque sequence when assembling a cylinder head?
• True or false: A tractor with hydrostatic steering has no mechanical linkage between the steering valve and the steering cylinder.
• What does a fuel pressure test verify in a diesel engine?
• Which statement best describes the difference between a common-rail fuel system and a traditional inline injection pump in diesel tractors?
• When sizing a tractor for a six-bottom moldboard plow, you should consider soil class.
• How would you diagnose an overheating engine caused by a blocked radiator or clogged cooling passages?
• The term flux in magnetism refers to invisible lines of force around magnets.
• What does emissions readiness indicate on a diagnostic scan tool?
• For plow drawbar power, which is the correct primary width factor?
• Which statement correctly describes the compression ratio?
• Is the statement that the draw-bar horsepower is -48 correct?
• What symptom is typical of hydraulic pump cavitation?
• Plastigage can be used to determine piston pin to bushing clearance.
• Voltage per cell in a storage battery is approximately 2.2 volts.
• To determine the power required to pull a six-bottom moldboard plow, which factor must be known?
• How can you verify a diesel injector is leaking by performing a simple pressure test on the injector line?
• Worn valve guides may be brought into specifications by knurling the guides.
• Is adding water with high mineral content to a wet-cell storage battery harmful?
• Which of the following statements is true?
• To determine the proper tractor size for a six-bottom moldboard plow, you should consider the soil class.
• Which of the following statements is true?
• What is cavitation in a hydraulic pump and how can it be prevented?
• Excessive valve guide wear can cause carbon lines to form on the valve stem.
• Is the statement that the draw-bar horsepower is -42 correct?
• What is the purpose of a fuel-water separator in a diesel tractor?
• During troubleshooting of a hydraulic system, which collection of checks is most appropriate to determine if the problem is due to pump prime, filter, relief valve, or valve alignment?
• How can you check for restricted radiator flow in a tractor?
• What is DEF and why is it important on Tier 4 tractors?
• Which safety steps must be followed before working on a tractor's hydraulic system?
• A hydrostatic transmission uses high fluid pressure to transfer power and operate hydraulic motors.
• DEF usage in diesel after-treatment systems.
• Temperature has an effect on hydraulic system performance.
• When sizing for a six-bottom moldboard plow, one should consider the class of soil (gumbo, clay, loam).
• A deglazer is used to clean a cylinder bore before installing dry liners.
• What is the function of a voltage regulator on a tractor's electrical system?
• What steps are involved in checking electrical connectors for corrosion and poor contact?
• Valve spring compressor usage: which statement is accurate?
• A faulty injector may be the cause of excessive gray or black smoke coming from a diesel engine.
• What are the typical PTO speeds on modern tractors and their common uses?
• Hazards with the highest probability of serious injury or death are red and white color-coded safety decals marked with the word 'danger'.
• The flywheel's function includes acting as a balancer for engine vibrations.
• When reading a symbolic drawing of a hydraulic system, a basic symbol with a circle indicates a pump or motor.
• What safety precautions are essential when performing a fuel system pressure test on a tractor?
• Remove all hydraulic pressure before servicing the accumulator system.
• Faulty injectors can cause: incorrect valve timing.
• What does 'load sensing' in tractor hydraulics mean and why is it used?
• Plastigage is suitable for measuring piston pin to bushing clearance.
• How can you differentiate between a diesel injector return leak and a leaking injector?
• Cavitation erosion is a condition in which air-formed vacuum bubbles develop and collapse inside a fluid, eroding metal parts.
• A tractor pulling a 3000 pound load at 4.5 mph will develop -28 drawbar horsepower.
• Steel tubing is the best material for high pressure hydraulic lines.
• Cavitation erosion is caused by vapor bubbles collapsing near a surface, leading to material loss.
• Rated maximum drawbar horsepower will average approximately 55% of maximum PTO horsepower for most tractors.
• A deglazer is used to clean a cylinder bore before installing dry liners.
• During a coolant system pressure test, what does a rapid pressure drop indicate?
• In a series connection of two identical 12V batteries, the voltage is 24V and the amperage rating remains the same.
• Batteries connected in series produce what output compared to a single battery?
• Which of the following statements is true?
• What is a common sign of belt slip on a tractor drive belt?
• Which color-coded decals are used to mark hazards with the highest probability of serious injury?
• Why is correct head bolt torque crucial in diesel engines with a head gasket?
• Which of the following statements is true?
• Bleeding a cooling system on most tractors serves what purpose, and how is it typically done?
• Which of the following statements is true?