CDL Doubles Triples Test 2024 (60 Questions with Explained Answers)

welcome to the 2024 CDL doubles and triples practice test this test has 60 Questions with explained answers to help you prepare for this test before we get started don't forget to jump start that like button to keep this channel running now here is your CDL instructor to walk you through the questions question one what conditions can cause parking brakes to freeze a wet weather freezing temperatures B dry weather freezing temperatures C wet weather temperatures above 35 fah d none of the above the correct answer is a wet weather freezing temperatures when the parking brake is applied during wet weather and freezing temperatures it can cause the brakes to freeze in this case the brakes will not function and the driver will have to wait until temperatures become warmer question two a driver should blank if the trailer goes into a skid a steer to the right B steer to the left C pump the brakes D release the brakes the correct answer is D release the brakes a driver should release the brakes when a trailer goes into a skid as a way to regain traction when the vehicle has regained traction then it straightens and becomes more manageable question three disconnecting the Pentel hook while the dolly is still under the rear trailer could cause injury by blank a crushing latch hook B causing an unstable trailer C the dolly bar flying up d none of the above the correct answer is C the dolly bar flying up drivers should never unlock the pintel hook when it is under the rear trailer it could cause the dolly bar to fly up causing injury in addition the pintal hook flying up will make it very difficult to recouple question four to ensure drivers have enough time to slow down and change lanes gently they should blank a watch brakes of the vehicle directly in front B look far ahead C drive ahead of other trucks and buses D shift into a lower gear the correct answer is B look far ahead looking far ahead is a defensive driving technique that all CDL Drivers should practice drivers must maneuver double and triple trailers smoothly to prevent tipping over or Jack knifing looking far ahead will give a driver more time to adjust their vehicle when they see a hazard ahead question five how is inspecting brakes on a double or triple the same as inspecting brakes on a normal Combination Vehicle a steps are the same B same size C it takes the same amount of time D all of the above the correct answer is a steps are the same the brake inspection of doubles and triples is very similar to the inspection on regular combination vehicles the brake parts are the same and the steps are the same since the double and triples are bigger there are more parts and the inspection requires more time question six to help manage space on the side of a truck the driver should blank a keep extra space in front B decrease speed C stay in the left lane D avoid driving alongside other vehicles when possible the correct answer is D avoid driving alongside other vehicles when possible drivers should manage their side space to avoid damaging other vehicles in addition to not driving alongside other vehicles drivers should also keep as much space possible between side and oncoming Vehicles drivers should always make sure to make room for other vehicles when entering highways question s it is dangerous to drive in very hot weather when the tire's air pressure is blank a too low B too high C at 105 PSI D between 100 and 105 PSI the correct answer is B too high when driving in very hot weather the air in the vehicle's tires expands and could reach unsafe levels in this situation the driver should pull over and give the tires a chance to cool never let air out of the tires to prevent dangerously low levels once they have cooled question eight rear W amplification can increase with the number and size of trailers in tow and cause a blank a tractor protection effect B Combination Vehicle effect C shut off effect D crack the whip effect the correct answer is D crack the whip effect braking inside a curve can be dangerous and drivers should always enter at a safe speed a driver needs to enter a curve in a gear that will allow the driver to accelerate in the curve and maintain control question nine how much space should be between the upper and lower fifth wheel when checking the converter Dolly to the rear trailer a 1 2 in B 432 in C none D varies the correct answer is C none if there is space between the upper and lower fifth wheel then the converter dolly is not coupled correctly in this case the problem must be corrected to prevent the trailer from becoming loose question 10 blank are connected from the trailer tongue to the tow vehicle a cotter pin B safety chains C castle nut D Pitman arm the correct answer is B safety chains safety chains are the first line of defense in the event of a disconnection of the trailer and Tow vehicle it is important that chains are connected properly and are an important part of the pre-trip inspection question 11 two main components in the coupling system are the trailer Kingpin and the blank a retarders b shut off valves C fifth wheel d red tailor knob the correct answer is C fifth wheel a payload Powers a coupling system to connect a tractor to a trailer the fifth wheel locks around a trailer's Kingpin and the connection enables the truck to haul a trailer proper coupling techniques are important to prevent damage to the equipment question 12 because double and triple trailers are longer and need more space drivers must increase their blank a braking pressure B following distance C acceleration D reaction time the correct answer is B following distance double and triple trailers need more space and cannot be stopped or turned suddenly drivers should allow more following Distance by leaving a larger Gap when entering and Crossing traffic drivers should also make sure there is is clearance on all sides of their vehicle before changing lanes question 13 retarders should be blank when the wheels have poor traction a turned on B turned off C increased D decreased the correct answer is B turned off retarders can be turned on and off by the driver and should always be turned off during poor weather conditions snow rain and icy conditions cause poor wheel traction which could make a trailer skid if the retarders are turned on question 14 a safe speed on a curve for a straight truck may be too blank when pulling double or triple trailers a slow B appropriate C fast D inconsistent the correct answer is C fast double and triple trailers are less stable than other CDL vehicles and Driver must take special care drivers need to steer gently and Drive slowly around corners onramps off-ramps and curves to prevent rolling over question 15 blank is one reason for hydraulic brake failure a brake fade B stab braking C snub breaking d none of the above the correct answer is a brake fade if experiencing hydraulic brake failure the driver should try to slow down the vehicle by downshifting to a lower gear and applying the parking brake the driver should also pump the brakes to try and increase hydraulic pressure question 16 when are Road surfaces most slippery during the rain a when the rain first starts B after it has been raining for days C just before the rain starts D all of the above the correct answer is a when the rain first starts when rain first begins it mixes with oils on the road surface that may become slippery and hazardous as more time passes the rain washes away some of the oils and the surface becomes less slippery question 17 what is the braking method used when the driver presses hard on the brakes to lock up the wheels and then releases so the wheels start rolling again a snub braking B stab braking C controlled braking D proportional braking the correct answer is B stab braking stab braking is used in emergency situations to stop double and triple trailers when using this method the driver presses the brake as hard as possible and locks up the brakes before releasing this method will help doubles and triples stop in a straight line and prevent Jack knifing question 18 it is dangerous to load materials on one side of a tra trailer due to blank a increased risk of a rollover B damage to the materials C stopping distance D breaking distance the correct answer is a increased risk of a rollover to load a trailer for safe travel it must be evenly distributed at least 60% of a trailer's weight should be loaded in the front end of the vehicle lighter items should always be loaded closer to the rear of the trailer question 19 a triple axle should not lose more than blank in a minute during an applied leakage test a 11 PSI B 5 PSI C 6 PSI D 3 PSI the correct answer is C 6 PSI during an applied leakage test the driver presses the brake for 1 minute this test is to ensure the vehicle does not lose too much air pressure after 1 minute the air pressure should not drop more than 6 PSI question 20 what is a pental hook a a tow hitch used for class B Vehicles only b a tow hitch used to handle heavyduty Towing c a connection hook on the protector valve d a crank hook on the landing gear the correct answer is b a tow hitch used to handle heavyduty towing a pintle hook is a tow hitch for Class A a vehicles in order to operate a vehicle with a pintal hook a driver must have a class A license with o restriction question 21 the warning lights on the dashboard should come on and turn off after a few seconds when blank a when there is a mechanical problem B when the warning lights have been reset C after fluids have been changed D when the engine is started the correct answer is d B when the engine is started dashboard warning lights are used to show a driver if there is a mechanical problem with a vehicle after starting the engine if the lights remain on after a few seconds the driver should check with a mechanic to see if it is safe to take on the road question 22 drivers should review the last vehicle inspection report blank a before conducting a pre-trip inspection B when a problem is detected C after a post-trip inspection D when instructed by the mechanic the correct answer is a before conducting a pre-trip inspection a driver should always review the last vehicle Report to see if any repairs were needed from the prior shift a driver will then sign and confirm that all needed repairs have been made and the vehicle is safe for use question 23 the trailer height must be blank in the center of the the fifth wheel a slightly lower B higher C centered d none of the above the correct answer is a slightly lower in order for the trailer to be raised so the dolly can be pushed under the trailer must be slightly lower than the fifth wheel the landing gear should be slightly off the ground in order to prevent damage if the trailer moves question 24 Chan of Wheels locking up increases with blank a anti-lock brakes B heavy load C light load D dry road conditions the correct answer is C light load when a truck is lightly loaded it has less traction caused by stiff suspension Springs and strong brakes to prevent wheels from locking up driver should remember to keep firm and constant pressure on the brakes while stopping question 25 while crossing a railroad crossing blank can cause trailers to become stuck on the tracks a low truck clearance B truck weight C height clearance D type of cargo the correct answer is a low truck clearance when there is a difference in the roadway elevation and the railroad elevation there is an increased Hazard to many trucks with low clearance drivers must be aware of their low clearance and change course if there is any question if the truck is able to clear question 26 since January 1st 1975 it has been required that trailers with air brakes have a blank a handbrake B foot pedal brake C parking brake D antiock brakes the correct answer is C parking brake older trailers were not required to have a parking brake and would not have a backup system if air pressure was lost many manufacturers fulfill the requirement of having a parking break by having Spring Breaks question 27 because double and triple trailers have more blank to pull it increases chances of losing traction and skidding in adverse weather conditions a dead axles B ring hitches C converter gears D kingpins the correct answer is a dead axles drivers of double and triple trailers have longer length and more dead axles to pull with their Drive axles drivers must be especially careful during Mountain driving and adverse weather that cause slippery conditions question 28 what is one way to cause a trailer to jack knife a Aiming High and steering B driving too slow C brakes locking up D increas increasing stopping distance the correct answer is C brakes locking up when the wheels on a trailer lock up the trailer will swing around this is usually called a trailer jack knife when a trailer is empty or is carrying a light load the chance of a trailer jack knife is increased question 29 when should placards be used on a tractor trailer a when transporting live cargo B to confirm the cargo is safely loaded C when hazardous materials are being transported D dry materials the correct answer is C when hazardous materials are being transported placards are used to warn others that a vehicle is carrying hazardous materials the hazard class is required to be labeled on four identical placards a placard should be displayed on the front back and both sides of the vehicle question 30 the shut off valve at the rear of the front front trailer must be blank and the shut off valve at the rear of the back trailer must be blank a open closed B open open C closed open D closed closed the correct answer is a open closed the shut off valve in the rear of the front trailer is kept open to prevent pressure build up between trailers and allows air to flow freely in the rear of the Back trailer the shut off valve must remain closed to prevent an unintended release of pressure question 31 the blank is controlled by the foot brake or the trailer's handbrake and supplies air to the trailer's brakes a trailer lines b control line C Tank Lines D vertical lines the correct answer is b control line the service control line is sometimes called the service line or signal line the pressure in the service line will change depending how hard the driver presses on the foot brake or hand valve question 32 when checking air flow in all double and triple trailers how do drivers know when the entire system is charged a when all shut off line valves are closed B when the dolly shut off valve is closed C when the trailer shut off valve is closed D when the driver hears air escaping after opening the emergency shut off line valve at the rear of the last trailer the correct answer is D when the driver hears air escaping after opening the emergency shut off line valve at the rear of the last trailer air must reach all the way to the back trailer in order for the brakes to work if the driver does not hear air escaping then the shut off valves on the trailer and the dolly needs to be checked both the trailer and dol's shut off valve should be in the open position question 33 blank semi-trailers should always be in first position behind the tractor and the blank trailer should always be in the rear a lightly loaded heavier b topheavy lower C heavily loaded lighter D lower topheavy the correct answer is C heavily loaded lighter heavier loads should always be in the first position behind the tractor in order to stabilize the load if the weight is in the rear of the load the vehicle cannot handle swinging movements and sideway forces question 34 in Colder Weather Bridges freeze blank the road surface a later than b before c same time as D all of the above the correct answer is B before drivers need to be aware that Bridges freeze before Road surfaces if roadway conditions are safe drivers still need to slow down and use caution when driving over a bridge it could be dangerous for a driver to drive at the same speed from a road to a bridge with icy conditions question 35 blank is the most likely to tip over when a vehicle turns suddenly a the front tractor B the middle trailer C the last trailer D trailer with the lightest load the correct answer is C the last trailer when turning suddenly the vehicle's last trailer is two times more likely to turn over the speed of the vehicle its weight and load all factor into the trailer's turnover risks question 36 examples of distracted driving are blank a eating B looking through paperwork C talking on the phone D all of the above the correct answer is D all of the above drivers that are distracted are very dangerous to other drivers and pedestrians there are many ways for drivers to be distracted talking on the phone or texting while operating a vehicle is a serious offense and could result in loss of employment or CDL suspension question 37 when parking drivers need to be aware of how parking lots are arranged so they can blank when exiting a parking space a pull straight through b back up carefully C pull around other vehicles D align with other vehicles the correct answer is a pull straight through when parking drivers need to be aware of how parking lots are arranged and plan ahead drivers should avoid parking in an area that will prevent them from driving straight ahead and put them in a position where EX exiting will be a difficult maneuver question 38 where should a converter Dolly be positioned a behind the rear trailer b in front of the triple trailer C in front of a second rear trailer D behind the triple trailer the correct answer is C in front of a second rear trailer if the distance is twoo great when positioning the converter Dolly wheel the dolly into position by hand and line it up with the Kingpin the tractor and first semi-trailer can also be used to pick up the converter Dolly question 39 a blank uses a valve to create back pressure and restrict exhaust a electric retarder b hydrulic retarder c exhaust retarder d none of the above the correct answer is C exhaust retarder the exhaust retarder restricts the upward movement of the piston and limits the engine's operation this happens when the retarders hold air inside the exhaust system that is caused by burning fuel question 40 when inspecting landing gear a driver should make sure blank a it is fully raised and has no missing bent or damaged Parts B crank handle is in place and secure C no air or hydraulic leaks D all of the above the correct answer answer is D all of the above landing gear keeps a trailer level when it is removed from a tractor the landing gear keeps the truck safe and is located in the front of the trailer it has two legs and can support the heavy weight of a trailer question 41 a tractor and trailer can still be used together even if blank is equipped on a trailer only a valve switch B air brakes C antiock brakes d all of the above the correct answer is C anti-lock brakes anti-lock brakes add additional protection when braking and are not required to be on both the tractor and the trailer even without anti-lock brakes the air brakes provide the protection needed question 42 before entering a curve a driver should blank a shift to neutral B downshift C speed up D use snub breaking the correct answer is B downshift downshifting before entering a curve is sometimes called engine braking downshifting should be done before entering a curve to prevent skidding a driver should never break or downshift in the middle of a curve question 43 during an air BR check after the air pressure has reached normal level the driver should blank a pump the service brake b press hard on the service brake C turn the engine on D push in the red trailer Air Supply knob the correct answer is D push in the red trailer Air Supply knob pushing in the trailer Air Supply knob will supply air to the emergency supply line to provide air to the service line the driver will use the trailer handbrake question 44 what should be coupled first with a triple trailer a the rear trailer b the middle trailer C the trailer loaded first D the trailer directly behind the cab the correct answer is D the trailer directly behind the cab once the first trailer is coupled directly behind the tractor the converter dollies and trailers should be connected in order before coupling the driver should check their fifth wheel and check around the trailers for obstructions question 45 blank railroad crossings are controlled by Gates lights and Road markings a active B passive C out of service D exempt the correct answer is a active railroad crossings that are in regular use are considered active and are controlled by Gates lights and Road markings passive Crossings do not have lights and Gates and are rarely used C ddl drivers should always stop at both active and passive Crossings question 46 and blank produces air for the brake system a air compressor B Governor C air supplier D brake compressor the correct answer is a air compressor the air compressor is powered by a vehicle's engine and produces air for the braking system normal pressure is drawn in by the air compressor forced into a smaller space to increase the air pressure question 47 if a second trailer does not have spring brakes the driver should blank the wheels a park against a curb B Park on an even surface C chalk the wheels D leave space between other trucks the correct answer is C chalk the wheels wheel chocks are wedges made of a sturdy material and sometimes coated with rubber they are placed against a vehicle's Wheels to prevent movement chalks are an important safety feature and should be used along with brakes question 48 what are some steps taken to secure a second rear trailer a drive the tractor close to the trailer b connect the emergency line C charge the trailer's air tank D all of the above the correct answer is d all of the above all drivers of double and triple trailers should have a basic knowledge of coupling and uncoupling safely if the second trailer does not have a spring breake the driver can set the emergency brake by driving the tractor close to the trailer and connecting the emergency line after charging the trailer air tank the driver needs to disconnect the emergency line chocks should always be set in place if there is any doubt about the brakes question 49 when air pressure drops between 40 and 20 psi the blank a the service brake locks B the buzzer and warning light will activate C the spring break will activate D both B and C the correct answer is C the spring breake will activate when air pressure drops to 60 PSI the warning buzzer will activate to let the driver know air pressure is low if the pressure continues to drop the service brake will come on between 40 and 20 psi a driver should never wait until the service brake releases and should pull over as soon as the warning light signals the air pressure is dropping question 50 a blank tractor trailer has in blank chance of rolling over a empty increased B fully loaded increased C fully loaded increased D empty same the correct answer is B fully loaded increased when a tractor trailer is fully loaded its stopping distance is increased If a driver is not cautious and looking ahead for hazards it could increase the chance of an accident a fully loaded trailer also needs to be maneuvered more slowly and carefully question 51 drivers should always avoid backing a trailer due to blank a poor visibility behind the vehicle B difficult to maneuver C take too much time D not designed to back up the correct answer is a poor visibility behind the vehicle even though drivers should avoid backing up a trailer there are times when it is necessary If a driver needs to back up there should be a spotter available to help make sure the maneuver is done safely drivers should also make sure to take time to drive slowly and use their mirrors question 52 compressed air contains blank and must be drained from the tanks regularly a dust B water C transmission fluid D Grime the correct answer is B water there is usually some amount of water in the compressed air in the air brake system this must be drained regularly to prevent a buildup and damage to the brakes question 53 what are some ways that affect a driver's ability to operate a vehicle SA safely a lack of sleep B over-the-counter medications C difficulties personal life D all of the above the correct answer is D all of the above it is a Driver's Responsibility to make sure they are clear-minded and alert to drive safely sometimes behaviors outside of working hours can carry over into a driver's shift a driver must always make sure they are eating healthy getting enough sleep and keeping healthy question 54 what affects a double and triple trailer stopping distance a speed B weight C how much space is needed to stop D all of the above the correct answer is D all of the above when the speed of a double or triple trailer increases by half then its stopping distance is four times higher the trucks increase in size or weight also increases its stopping distance this is one reason why trucks are so highly regulated question 55 road conditions are most Slippery When blank a wet B wet and icy C snowy D newly paved the correct answer is B wet and icy many road conditions such as snow rain and ice can reduce tire traction ice that begins to melt becomes even more slippery and dangerous question 56 what does a yellow lamp on the left side of a dolly mean a the dolly has anti-lock brakes B the dolly has air brakes C the dolly is for double trailers only D all of the above the correct answer is a the dolly has anti-lock brakes before March 1 1998 dollies were not required to have anti-lock brakes a yellow lamp on the left side of a dolly lets drivers know that the dolly was made after March 1st 1998 and is equipped with anti-lock brakes question 57 when driving a 40 ft truck at 55 mph the following distance would be blank a 5 Seconds B 8 seconds c 7 Seconds D 12 seconds the correct answer is a 5 Seconds when calculating 1 second for every foot of vehicle length traveling time would be 4 seconds since the speed is above 40 mph then another second is added bringing the following distance to 5 Seconds question 58 a 50 ft vehicle traveling 35 mph should allow blank travel distance a 7 Seconds B 5 Seconds C 15 seconds D 10 seconds the correct answer is B 5 Seconds to calculate traveling distance a driver should allow 1 second for every 10 ft of vehicle length while traveling at a speed below 40 m pH as the vehicle speed increases so does the traveling distance by 1 second question 59 blank is when a vehicle's rear wheels do not follow the same path as the front wheels during a turn a Center Line tracking B pivot tracking C straight line tracking d off tracking the correct answer is d off tracking drivers need to be aware of their trailer wheels every time they turn off tracking can be very dangerous and pedestrians are especially at risk alignment problems may be one cause for a vehicle off tracking question 60 blank are required on all converter dollies built after March ver 1998 a air compressor valve B trailer protection valve c antiock brakes D spring brakes the correct answer is C anti-lock brakes a converter dolly is an unpowered vehicle that enables trailer units to pull tractors it has one or more axles a fifth wheel and draw bar all dollies built after March Fern 1998 are required to have anti-lock brakes hope you enjoyed this video if you still need more practice then check out these videos or click the first Link in the description to get your cheat sheet which will help you pass your CDL exam on your first try

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Id: ghbc1s7wfnI

Length: 36min 3sec (2163 seconds)

Published: Sun Mar 17 2024