Diesel Mechanic College Practice Test

These questions are part of the practice quiz. Start practicing

• The alternator converts mechanical energy into electrical energy by _____________.
• Before servicing the spring brake actuator, which safety step is required?
• Which of the following is covered under the Resource Conservation and Recovery Act?
• What part of an alternator produces the magnetic field?
• A typical cause of pulling brakes would include which of the following?
• What is the most effective immediate action to minimize eye exposure during shop tasks?
• The oil filter should be replaced every how many miles and at every transmission fluid change?
• Which highway truck classifications are typically referred to as 'heavy duty'?
• When planning to drain and replace the lubricant in a differential carrier, which of the following is preferred?
• Which statement is correct about tire inflation and rim safety between the two technicians?
• Which device is used on some cranking circuits to prevent starter motor operation if voltage drops below a threshold?
• In diagnosing a low oil pressure condition, what is the initial check you should perform?
• ______is best removed by chipping it from the brake drum and then cleaning the hub with a wire brush.
• The release fork in a pull-type clutch is what shape?
• Which symptom is most commonly associated with excessive torque loading of the driveline?
• If a voltage test shows uneven voltage among cells, this most likely indicates what?
• Which of the following fuels has the most heat energy?
• According to Ohm's Law, if circuit resistance increases and voltage stays the same, current will ___
• How does ABS prevent brake lockup?
• What is used to perform switching functions in an electronic voltage regulator?
• Which statement best describes a series-wound motor?
• If the electrolyte level is lost through evaporation, what should be added?
• The alternator cable ___________ test is performed to test the positive cable for excessive resistance between the alternator and the batteries.
• In the shop working area, which item must be worn at all times for eye protection?
• Left-hand threaded wheel lug nuts are typically found on which configuration?
• What provides essential speed information to the ABS control module?
• The LONG-STROKE type 30 brake chamber corresponds to what maximum pushrod travel?
• Which alignment angle can be corrected using shims on a leaf spring front end?
• Which device is activated by air pressure to manage torque distribution between axles?
• Resistance to current flow is measured in ___.
• Where is the reference point located when measuring a speed sensor or modulator position?
• In a closed circuit, the sum of voltage drops across all components equals the ______.
• A voltage reading can identify what issue?
• The best way to prevent eye injury is to:
• Which of the following statements about DPF regeneration intervals is stated for a linehaul diesel engine?
• Which type of suspension is most commonly found on highway trucks today?
• Which component's wear is most commonly used to assess clutch wear?
• Under constant voltage, current varies inversely with which quantity?
• Which joints are designed to operate at angles without speed variation, unlike Cardan joints?
• During an inspection of drum brakes in a vehicle, which symptom indicates some wheel ends are applying more brake force than others?
• What instrument should be used to measure alternator current output?
• When an idler gear is placed between the driving and driven gear, the driven gear:
• Which type of facing material is rarely used as a full-face lining?
• In a typical truck cranking circuit, which component completes the high-current path to the starter motor when energized?
• Which OEM-approved lubricant would provide the longest service life in a standard transmission?
• What is used to control the current output of an alternator?
• Which is the most common method of attaching a kingpin to a trailer upper coupler assembly?
• Which device is used to measure distance traveled on a trailer's axle hubs?
• Which term describes the device that limits steering rotation?
• Which temperature condition is preferred when draining differential lubricant?
• The term ____________ refers to the direction in which the rear wheels are pointing.
• Which of the following is NOT a good practice when using a hammer?
• A test light is used to ______
• Which statement about wheel nut tightening and vehicle support during tire service is correct?
• Which of the following is a driven member in a clutch assembly?
• Battery testing is recommended whenever a(n) ___________ is replaced.
• The amount of __________ a battery supplies is a function of the surface area of the plates.
• Transmission oil not only lubricates a transmission's moving parts, but it may be used to ________ the transmission.
• Which device is typically used to rectify AC to DC in an alternator?
• Which belt type is known for driving multiple accessories with a single belt?
• Which of the following is said by transmission OEMs to cause most transmission bearing failures?
• Which statement about a starter relay is correct?
• The "power divider" or "inter-axle differential lock" is activated usually by _______________.
• In SCR systems, what fluid is regularly replenished to maintain operation?
• When using the TMC method of adjusting wheel bearings, endplay must be within what range?
• In an air brake system, which component functions as a lever to actuate brakes?
• Which statement is most accurate regarding solid mounted suspension systems?
• Center bearings are typically permanently ___________.
• When will output torque be greatest in a truck starter motor?
• A truck with six wheels, four of which are driven, would be classified as which configuration?
• Which component uses electromagnetic energy to accomplish mechanical movement?
• If the thermostat routes coolant through the bypass circuit, the coolant is circulated
• What type of discs do not absorb engine torsional vibrations?
• What leads to battery plate sulfation and grid corrosion?
• Two main advantages of air spring suspension are that the load is better protected and _________________.
• If axle alignment and spacing are not maintained, which aspect of vehicle performance is primarily affected?
• When lubricating a U-joint, fresh grease appears at all four trunnion seals. Which statement is most likely true?
• When is ABS self test performed?
• Solid mounted systems can be found in vehicles that have a high __________.
• In an air suspension, what happens to the air in the air bags when a height control valve lever is raised upward off horizontal?
• What is the material of choice for the driveshaft tube in the heavy-truck market due to its strength?
• The cross-shaft in a clutch assembly primarily supports which component?
• Converting the AC current to usable DC current in an alternator is referred to as __________.
• Which term describes the temperature at which paraffin wax crystals begin to form in diesel fuel?
• What component prevents a starter motor from being turned by the engine at speeds that could damage the motor?
• What is used in an alternator to rectify AC to DC?
• Upon completion of a job, each technician is required to ______________
• Which of the following is a safe practice when working on high-voltage vehicle systems?
• When adjusting S-cam brakes equipped with manual slack adjusters, which of the following must be true?
• What hardware is used to correct caster angle on a leaf-spring front end?
• What color is the ABS indicator lamp?
• When the thermostat routes coolant through the bypass circuit, what is happening?
• In a gear train, when an idler gear is positioned between the driver and driven gear, the driven gear's rotation direction is what relative to the driver?
• Which wire color codes the ground circuit on the trailer 7-way power connector?
• During preventive maintenance checks on the clutch housing mounting, you would inspect the bolts for which condition?
• Engine displacement is defined as the
• _______ measure the difference in electrical pressure between two different points in the circuit.
• What is the maximum allowable pushrod travel when adjusting brakes with a LONG-STROKE type 30 brake chamber?
• Maximum allowable pushrod travel when adjusting brakes with a STANDARD type 30 brake chamber?
• Which cleaning method is commonly used for EGR coolers?
• Which brake components are lubricated with chassis grease as part of a lube job?
• When replacing brake drums, the drum must be matched correctly with its proper ______.
• Maintaining the alignment and spacing of the axles adds to vehicle ______.
• What provides steering power assist in most heavy-duty highway truck systems?
• Which statement is true about battery capacity reduction related to faster recharging?
• Controlling the strength of the magnetic field in an alternator is the job of the ________.
• Brake drums need to be discarded if they experience ______.
• When diagnosing charging system problems, always start with the ______.
• For an S-cam brake, when the slack adjuster is fully applied, the ideal slack adjuster to pushrod angle is
• Which two benefits are cited as the main advantages of air spring suspension?
• _____ is the measurement of frequency and indicates the number of cycles per second.
• Which fuel has the most heat energy?
• Self-adjusting clutches have an automatic adjusting system that relies on ___________ movement to cause an adjustment.
• If you double the supply voltage while resistance remains constant, what happens to current?
• Which statement best reflects proper lubrication status of a U-joint during service?
• Using the TMC method of adjusting wheel bearings, endplay must be within what range?
• In a turbocharged diesel engine, the component that diverts exhaust flow away from the turbine to limit boost is called?
• Which type of circuit offers only one path for current flow?
• What device is used to control the air in and out of the air springs in an air suspension system?
• The electrodes and electrolyte of a lead-acid battery cell produce ________ volts.
• The exhaust pipe of a diesel engine must be connected to the shop exhaust system to protect against:
• Which component contains stationary windings that are energized by rotor's magnetic field?
• A cause of a grinding noise when the brakes are applied would include______________.
• Which should be the first priority when working around and servicing batteries?
• Which condition commonly leads to diode failure?
• A fully charged battery should have an open-circuit voltage of how many volts?
• The RIST procedure stands for
• Which type of engine brake uses the compression stroke of the piston as its retarding stroke?
• A battery must be at least ______ charged to perform a capacity test.
• All electrical devices (loads) have internal ____________.
• Which type of diesel engine coolant is regarded as potentially the most harmful to humans?
• Which of the following are used to limit the turning angle of the steering knuckle?
• What provides the input signal to the ABS module?
• Which of the following best describes the function of a wastegate in a current turboboosted diesel engine?
• An alternator's performance is tested under load and measured while the engine is at _____ rpm.
• In AC circuits, the term used to describe overall opposition to current flow is __________.
• Which device is used to measure electrical power consumption?
• A break in a circuit that causes a loss of continuity is called a:
• Which combination describes proper post-job protocol?
• Which device attached to the transmission provides power to auxiliary components by being gear-driven?
• The ___________ plate is the surface of the clutch cover that squeezes the clutch disc against the flywheel.
• No-maintenance batteries have vents beneath top cover, tops are what?
• Which statement aligns with early emission reduction measures for diesel engines?
• Heavier clutch installations may require the use of a _________.
• The purpose of the 'power divider' or 'inter-axle differential lock' on a tandem drive axle truck is to _________________.
• What wire color code is the right turn signal circuit on the trailer 7-way power connector?
• Trickle chargers charge a battery at a low ___________.
• What kind of wear can be determined by inserting a go/no-go gauge into the backing plate hole?
• In heavy-duty clutch installations, a special tool may be needed to install the clutch. What is this tool commonly called?
• What is the term for devices that draw current from the battery when the ignition is off?
• Common causes of driveline vibrations include which of the following combinations?
• What is the recommended initial cranking pattern for a hard-to-start engine?
• What type of lever is actuated by the clutch linkage and moves the release bearing?
• As the clutch wears, which component becomes thinner?
• Which component is driven by the engine and transmits torque to the transmission?
• Which component in an alternator produces the magnetic field?
• The output (signal) of a wheel speed sensor is measured in:
• The typical material for a battery case is?
• Which type of joint maintains constant velocity when articulating at angles?
• If a short circuit occurs, what happens to current?
• Which of the following engine lubricants must be used if an engine is equipped with a DPF?
• Which component of the alternator is the rotating electromagnet that supplies the magnetic field?
• Lead-acid battery cell voltage per cell is approximately 2.1 volts.
• What is the difference between trailer-specific tires and tractor tires?
• During jump-starting a truck with electronics, where should the ground connect?
• When diagnosing an engine that produces black smoke under load, what should be checked first?
• What is the maximum horizontal movement permitted at the fifth wheel before it can be considered CVSA OOS?
• Low __________ permits high amounts of amperage to flow out of the alternator.
• Heavy duty trucks use axle assemblies that allow the axle housing to support the vehicle weight and the axle shaft only applies power to the wheels. This is called a ______.
• If two 12-volt batteries are connected in parallel, the resulting voltage would be:
• Which component is the primary means by which trailer weight is transferred to the fifth wheel plate?
• Gassing in batteries involves which gases?
• What is the main output device on a truck ABS?
• The drag link connects which two components?
• When removing a parking brake chamber, it must be caged first. This can be done with which of the following methods?
• During preventive maintenance checks on the output shaft bearings, which condition indicates radial play?
• What term refers to the voltage that the alternator uses for regulation of the output?
• Which option describes what the Resource Conservation and Recovery Act addresses in automotive contexts?
• What is the function of the release bearing in clutch systems?
• In the typical truck diesel fuel subsystem, which component is usually subject to the lowest pressure in the circuit?
• Which device handles switching in an electronic voltage regulator?
• Technician A states that DPFs can run up to 8 hours in a linehaul diesel engine before regeneration. Technician B states that some DPFs must be removed from the vehicle for cleaning on a weekly basis. Who is correct?
• The steering principle, toe-out-on-turns, is controlled by angles manufactured into the ____________.
• In a typical single drive axle, which wheel does power go to?
• Which component controls the magnetic field strength in an alternator?
• For an automated battery tester, which piece of information is required to assess performance?
• Which of the following alignment angles has the potential to cause the most tire wear?
• A heavier driveshaft reduces its maximum ____.
• Which law describes the relationship among voltage, current, and resistance?
• In an alternator, which component is the rotating electromagnet that provides the magnetic field to induce voltage in the stator?
• What is the function of a neutral safety switch in the cranking circuit?
• Which unit expresses current flow in a circuit?
• A properly adjusted ______ clutch has a certain clearance between the tips of the release fork and the wear pads on the release bearing.
• Incorrect charging system voltage can cause ______.
• When checking the oil level in a standard transmission with no sight glass, where should the oil level be?
• After replacing the alternator, which action is recommended to verify electrical health?
• What type of facings are rarely full-face linings?
• Lead-acid electrolyte hazard?
• What quantity of oil does the distance from the top to the bottom of the crosshatch area on a typical heavy-duty diesel engine dipstick represent?
• Manufacturers explicitly forbid any bending of axles to make adjustments for ___________.
• Which of the following can be used to smooth alternator AC ripple and prevent electromagnetic interference (EMI)?
• The temperature at which a fuel evaporates sufficient flammable vapor to momentarily ignite when a flame is brought close to its surface is known as:
• Which is the more likely cause of an electrical connection that heats up?
• When referencing a speed sensor or modulator position, what is the reference point?
• What is the first step to completely deflate a tire?
• Which configuration would describe a typical heavy-duty truck wheel setup with multiple driven wheels?
• In series connection of two batteries, which electrical parameter doubles?
• Connecting an ohmmeter into a powered circuit will likely cause what outcome?
• What should exist between all junction points of the stator?
• Fifth wheel height is defined as the distance from ground level to which part?
• In an alternator, which of the following makes an electrical connection to the rotor field coil to supply current from the voltage regulator?
• When a diesel engine is operated at lower-than-normal combustion temperatures, which category of exhaust emissions is likely to increase?
• What must be removed in order to remove the clutch?
• Which of the following clutch components is a driven member?
• What is the term for a wheel moving upward from bumps in the roadway?
• One of the first steps taken to reduce diesel engine emissions was to reduce the sulfur content in the diesel fuel.
• RIST stands for
• Endplay in the TMC bearing adjustment is measured in which unit?
• Which of the following is NOT a safe practice when using truck lifts and hoists?
• A dry-van trailer typically uses what construction style?
• Oil that has a milky, clouded appearance is probably contaminated with:
• Which component inside the alternator cannot be removed until disassembly?
• Which of the following is a true prohibition regarding axles for camber adjustments?
• Which solution provides the highest level of antifreeze protection?
• Which type of fifth wheel is most commonly used on highway tractors?
• A secondary fuel filter is located
• Before applying grease to a spring pack that cannot accept grease through the pins, what is the first step?
• Which of the following appearances would indicate batteries have either been overheated or frozen?
• In the trailer connector, which circuit color is standard for the right-turn signal?
• Which fifth wheel configuration allows articulation in all directions and is suited for rough terrain gooseneck operation?
• Which instrument is commonly used to gauge antifreeze protection in heavy-duty diesel engine coolants?
• Fifth wheel height is defined as:
• What device is used on some cranking circuits to prevent starter motor operation if the voltage drops below 9.6 volts?
• In an alternator, which of the following has stationary coils of wire in which current and voltage is induced by the magnetic field of the rotor?
• Which of the following are commonly replaced due to excessive spline wear from the clutch disks caused by torsional vibrations?
• U-joint failures, hanger bearing failures, and driveline vibrations are caused by
• In a full-floating axle, which component primarily carries the vehicle weight?
• What is generated when an exciter ring tooth and gap move past the sensor tip?
• A swollen battery case is a sign of what condition?
• If voltage is constant, decreasing resistance will cause current to
• The amount of current in a circuit depends on the circuit's __________.
• A(n) __________ belt is a type of multi-rib belt that is long enough to drive multiple accessories.
• The input shaft is the input to the transmission driven by the _________.
• Which maintenance issue commonly leads to a vehicle pulling to one side under braking?
• Which ABS component modulates hydraulic pressure to wheels?
• To install a conventional clutch brake, what must be removed in the vehicle?
• The air-release slide mechanism is preferred over the manual release when
• Which plate on the clutch cover squeezes the clutch disc against the flywheel?
• The temperature at which diesel fuel begins to form paraffin wax crystals is known as
• Preferred method of repairing a wheel seal leak that glazed the brake shoe linings
• Which of the following components connects the Pitman arm to the steering arm?
• Which device maintains shoe to drum clearance during initial adjustment and wear?
• The amperage a battery can supply is primarily determined by which feature?
• After bleeding the hydraulic clutch system, what type of specified fluid would you fill the master cylinder with?
• Which part must a brake drum be correctly matched with to ensure proper fit?
• When adjusting drag link length before installing it, which of the following should be true?
• Which condition is essential before installing a drag link to ensure proper steering geometry?
• What is another name for the inter-axle differential?
• Most alternators have the __________ inside the alternator that cannot be removed until the alternator is disassembled.
• Measuring _________ in a circuit can help evaluate resistance in high amperage circuits.
• Lead-acid battery electrolyte is described as?
• What describes the operating principle of a typical truck starter motor?
• The primary method to attach the kingpin to the trailer's upper coupler is
• If DEF is not replenished regularly in an SCR system, what is the most likely consequence?
• The tractor-to-trailer service brake line is typically which color?
• What is the function of a hubodometer?
• In any clutch, the clutch cover is the component that is bolted to which of the following?
• What is the usual maximum permitted voltage drop through the ground side of the starter circuit?
• Upon completion of a job, which activity is required?
• Which component automatically compensates for wear to maintain clearance between shoes and drums?
• Which coolant chemical is considered the most harmful to human health?
• Synthetic-based lubricants are characterized by what property compared with refined lubricants?
• Which term describes the two axles on a standard tandem trailer?
• What type of signal is generated when exciter ring teeth pass sensor tip?
• Oil-lubricated drive axle wheel bearings receive oil from
• To neutralize electrolyte spills, which substance should be used?
• What is the function of the seventh injector in a six-cylinder diesel engine?
• Which of the following is an advantage of a sliding fifth wheel?
• If a full-flow oil filter becomes completely plugged, what is the likely engine response?
• Changing the toe setting requires adjusting the _______________.
• What is the function of torque arms on a suspension system?
• If an ABS ceases to function, what is likely to occur?
• When you have overcharged batteries, the cause could be ___________.
• When ignition is off, what small electrical load does modern vehicle have?
• Which feature most reduces driver fatigue in highway trucks?
• When using an ohmmeter, you should ______.
• What is the preferred tool for separating a U-joint from a driveshaft?
• If grease exits from three of the four journal seals on the U-joint, what should you do first?
• Which method of cleaning an EGR cooler tends to produce the best results?
• What shaft is also called the output shaft?
• Which of the following tools is preferred when separating a U-joint from a driveshaft?
• In a four-stroke engine, what is the correct sequence of strokes?
• Alternators allow the reduction of _________ due to faster recharging rate.
• What footwear should be worn when working on high-voltage vehicle systems?
• The oil filter replacement interval statement is: which is correct?
• Which of the following clutch components is splined to the input shaft of the transmission?
• If a vehicle requires power to be split between front and rear axles, which system accomplishes this function?
• Which of the following is NOT a requirement for using a hammer safely?
• In a four-stroke engine, when the piston is at TDC of the compression stroke, the intake and exhaust valves will be
• What torque range is specified for wheel nuts?
• When conducting preventative maintenance checks on the output shaft, you would pry upward on the output shaft flange to check for radial play in the output shaft bearings; there should be none.
• What is the required amount of slack adjuster free travel on a properly adjusted, S-cam brake?
• Which statement about DPF regeneration frequency on highway driving is most accurate?
• Which statement best describes the proper lifting technique to reduce back strain?
• If the voltage regulator fails open, what is the likely outcome?
• Brake drum mounting holes and pilot surface must be ______.
• In a running diesel engine, the highest cylinder pressure occurs during which stroke?
• A typical dry-van trailer is a ____________ construction.
• What device is used primarily to absorb energy and dampen suspension oscillation?
• When lifting equipment, which practice supports safe lifting?
• What is the usual color of the tractor-to-trailer service brake line?
• What is the function of a rear drive axle on a truck?
• When troubleshooting electrical circuits, what would you use to look for voltage drops?
• In the shop working area, _________ MUST be worn at all times
• A ___________ is a device attached to the transmission that is gear-driven and can be used to run accessories.
• In AC circuits, the overall opposition to current includes resistive and reactive components and is called
• In a typical tandem drive axle truck, which axle does the power go to?
• Which material was previously used in brake linings but is no longer used?
• When lubricating the fifth wheel, Technician A lubricates all moving parts with water-resistant, lithium-based grease. Technician B lubricates the rails on a sliding fifth wheel with a mixture of oil and diesel fuel. Who is correct?
• In a pull-type clutch, the release bearing performs the same function as in a push-type clutch, which is to release the clutch.
• Which statement about wheel service is correct according to standard practice?
• What is the function of the control circuit in a truck cranking circuit?
• Which of the following occurs when batteries are subjected to prolonged undercharge conditions?
• What can be recognized by a slight wetting of an area on the component?
• When lubing a spring pack assembly, neither the fixed bracket spring pin nor the shackle pin will take grease. What should you do first?
• What provides the traction through which all of the acceleration, braking, and cornering forces are transferred to the road surface?
• In DPF regeneration discussions, which statement is correct?
• A driveshaft is in phase when:
• In powered circuits, which of the following are placed around a conductor and are used to measure amperage?
• In ABS operation, what data do wheel speed sensors provide to the control module?
• Like charges are ____________ by one another.
• Auxiliary sections are used to multiply the number of available _________ from a transmission.
• What color is the cap on a DEF tank?
• As the length of a conductor increases, what happens to the resistance?
• The latest types of brake lining are no longer manufactured with any ______ fibers.
• What is the unit for measuring power?
• In a typical downflow radiator, which part remains the warmest when the engine is at operating temperature?
• In the alternator, the magnetic field is created by the ____________.
• Every 10 degrees Fahrenheit temperature change will change inflation pressure by how many psi?
• What occurs when the drive or steer tires have stopped rotating when braking?
• Which factor slows chemical reactions in battery chemistry?
• Which statement is correct about EPA MY 2013 highway compliant diesel engines and SCR?
• In a cast spoke wheel assembly, where is the brake drum mounted?
• Where should differential oil level align relative to fill hole?
• What is the recommended maximum charging rate for a heavy-duty, 12-volt battery?
• Which instrument is used to measure current by placing around a conductor without breaking the circuit?
• In the statement about wheel nut lubrication and torque, who is correct?
• How many windings are in a typical alternator stator?
• What type of meter uses a sweeping needle that continuously measures electrical values?
• Technician A says that before electronic engine controls were used, most manufacturers used mechanical systems to control engine emissions. Technician B says that one of the first steps taken to reduce diesel engine emissions was to reduce the sulfer content in the diesel fuel. Who is correct?
• Which of the following is an unintended left or right direction change by a vehicle during a brake application?
• Trailer weight is transferred to the fifth wheel plate by which component?
• Which device converts electrical energy into mechanical motion using a magnetic field?
• During normal braking applications, the modulator valves are not ________.
• When did the federal government start tracking engine exhaust emissions in cars and trucks?
• Which device uses a small amount of electrical current from an internal battery and sends it through a circuit or component?
• ABS works by electronically measuring individual __________.
• What is the recommended action when electrolyte level drops due to evaporation?
• What quantity is measured in ohms?
• What is the SI unit of current?
• When using the TMC method of adjusting wheel bearings, endplay must be within what range?
• An inter-axle differential is also called a ___________.
• In an air suspension system, which device regulates ride height by controlling airflow to the air springs?
• In a closed electrical circuit, the sum of voltage drops across all components equals what?
• Which device ensures torque is distributed between the two drive axles in a tandem truck?
• In air brake systems, which component converts pushrod movement into mechanical force at the brake shoes?
• The TMC wheel bearing endplay range is 0.001-0.005 inches. Which option below shows that specific range?
• Which is the preferred method of repairing a wheel seal leak that has glazed the brake shoe linings?
• Most medium- to heavy-duty truck clutches are actuated by mechanical linkage systems and the actuation system starts with the ___________.
• Which component is used to absorb suspension energy and dampen oscillation in a typical suspension?
• What condition might indicate engine torsional vibration affecting the alternator mounting?
• Which of the following would result when two batteries are connected in series?
• Which method should be used to completely deflate a truck tire?
• In a clutch, which component supports the release fork?
• When checking the oil level in a differential carrier, where should the oil level be?
• To achieve different engine-to-wheel speed combinations, transmissions use multiple gear ratios; adding sections is called what?
• Which component contains ball and socket joints?
• What is the unit of electrical resistance?
• Which component is specifically associated with the lube job for bushings?
• ________ are current draws on the battery when the ignition is switched off.
• Which component allows the driveshaft to lengthen and shorten with suspension movement?
• When measuring voltage, a recommended practice is to ______.
• When using angle iron to mount fifth wheel brackets to a tractor frame, which of the following methods is recommended?
• Which engine lubricant specification is required for engines with a diesel particulate filter?
• Taper leaf springs consist of a leaf spring pack in which the leaves have a varying ______.
• What can result if a shop attempts to repair a truck diesel engine emission control system malfunction and fails to bring it back into compliance?
• Key-off loads contribute to ________ caused by prolonged discharge.
• The hardware used to adjust caster angle on a leaf-spring front end is known as what?
• What defines gross vehicle weight?
• What term describes when some wheel ends or axles brake harder than others?
• During a load test, the engine speed is normally at which rpm?
• Braking odors are typically related to overheated ______.
• Which is the best practice to prevent eye injury in a workshop?
• In the context of battery health, sulfation most commonly leads to:
• Which instrument uses an internal battery to push current through a circuit to measure resistance?
• Single-piece wheel rims must be inflated in a safety cage or while attached to the vehicle.
• Which term describes opposition to current flow in AC circuits?
• Oil-lubricated drive axle wheel bearings receive oil from:
• Which type of wheel assembly presents the least maintenance and alignment problems?
• Which describes a safe lifting and carrying practice?
• Which type of fifth wheel permits articulation at any angle for use with gooseneck trailers operated on rough terrain?
• Truck transmissions are specifically selected to match the ___________ of the vehicle.
• Which assembly uses U-joints?
• What is the recommended procedure when cranking a vehicle that is reluctant to start?
• Measuring voltage drop with a voltmeter when a circuit is operating is a more effective way of measuring ________________.
• Which component is commonly used to smooth EMI and ripple in the charging system?
• Which regeneration mode in diesel particulate filters typically operates automatically during highway driving?
• When investigating a low oil pressure complaint, which of the following should be performed first?
• Which circuit type provides more than one path for current to flow?
• Which of the following best describes a power-assist steering gear system used on most current trucks?
• Hammer safety: Which action is correct?
• What instrument do most OEMs recommend for checking the degree of antifreeze protection in heavy-duty diesel engine coolants?
• What arrangement is most common for standard heavy-duty truck geartrains?
• The harder the clutch is squeezed between the pressure plate and the flywheel, the greater the amount of torque the clutch can handle.
• Which of the following is covered under the Resource Conservation and Recovery Act (RCRA)?
• Which of the following allows the torque from the transmission to be split between the front and rear driving axles of a 4X4 vehicle?
• ABS configuration is defined by the location and number of wheel sensors and _________valves used.
• Varying the voltage and length of time a pulse is applied to the battery controls the ___________.
• ______ allows for the driveshaft to lengthen and shorten due to suspension movement.
• Which of the following best describes the purpose of diodes in an alternator circuit?
• One of the most common causes of universal joint and driveshaft failures?
• Lead-acid battery electrolyte is a mixture of sulfuric acid and ______.
• When connecting jumper cables, what will almost always occur on the last connection you make?
• When troubleshooting the air shift system, the engine should be turned off after building normal vehicle air pressure.
• ___________ refers to the tire path followed by the tires on a vehicle.
• Which of the following is the most widely used standard transmission geartrain arrangement in heavy-duty trucks?
• Which type of tire tread is recommended for use on steering axles for on-highway trucks?
• What is the main function of a hold-off diaphragm?
• Which shape best describes the release fork in a pull-type clutch?
• What is the moving component in an alternator?
• To neutralize electrolyte spills, you should use which compound?
• Broken and loose alternator mounting may indicate damage from which of the following?
• Excessive torque loading of the driveline usually causes which of the following?
• Which material provides chemical resistance for battery casings?
• Ackerman arms are designed to influence which steering behavior?
• ________ will wear the inside edge of both tires.
• Plugging the fuel tank vent in a diesel vehicle would most likely cause
• What types of lubricants are manufactured rather than refined and have much longer service life?
• What is the primary function of a hold-off diaphragm in a spring brake system?
• The term deep cycling in the context of a battery means:
• Which statement about clutch covers is true?
• If the ABS indicator lamp is amber, what does it signify?
• What is the measure of electrical pressure called?
• Where is the secondary fuel filter placed relative to the transfer pump?
• Which statement is NOT true about a rear drive axle?
• Which of the following can be defined as the inward or outward tilt of the top of the tires when viewed from the front of the vehicle?
• Which of the following gear sets would determine the output gear ratio in a single-reduction rear axle carrier?
• What term describes the small electrical consumption when the vehicle is off?
• In a tractor-trailer connection, which feature provides the coupling point and articulation between the two units?
• After finishing a job, which set of actions is required?
• What will removing the spring brake actuator require?
• What is the role of the Slack Adjuster angle on an S-cam brake during full application?
• What can cause premature failures of diodes?
• The go/no-go gauge used in the backing plate hole checks wear on which component?
• If the fuel tank vent on a diesel-powered vehicle is plugged, what would likely occur while running the engine?
• Which component provides the magnetic field when excited by the regulator?
• To ensure that the tractor and trailer are properly coupled by the fifth wheel, check by:
• A loose alternator belt will slip and cause which charging condition?
• Which component carries trailer weight to the fifth wheel plate?
• Which exhaust gas emission is targeted for reduction by an SCR system?
• What instrument is used to measure resistance in a circuit?
• Which principle should guide all battery servicing to minimize risk?
• In a battery, the electrolyte level should be ________ the plates.
• Which component in an oil-lubricated drive axle is lubricated by the banjo housing?
• Technician A says that a voltage drop of 0.4 volt measured over a battery terminal and post indicates a high-resistance connection. Technician B says that ground circuit specifications for voltage drops tend to be higher than on insulated circuits. Who is correct?