CDL Doubles Triples Test 2 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 when connecting a second trailer to your Combination Vehicle what is the recommended method for securing it a either of the above if available B utilize wheel chocks C app the tractor's parking brakes D rely solely on the trailer's landing gear the correct answer is a either of the above if available to secure a second trailer you can use either the tractor's parking brakes or wheel chocks if available both methods help ensure stability and prevent unintentional movement of the added trailer during coupling question two during an inspection of a coupled set of doubles or triples what should you verify about the pinl hooks a greased B latched C lubricated D removed the correct answer is B latched when inspecting a set of coupled doubles or triples it's crucial to confirm that the pinl hooks are securely latched to ensure a safe and reliable connection between the trailers preventing potential Detachment during operation question three which of the following statements accurately describes a recommended practice for maintaining space around your vehicle's sides a keeping a consistent speed when driving alongside other vehicles B adjusting your rearview mirrors to minimize blind spots C maintaining a tight formation with nearby vehicles for improved visibility D avoid traveling next to others when possible the correct answer is d avoid traveling next to others when possible this practice helps reduce the risk of collisions and potential blind spots giving you more control over your vehicle and allowing space to react to unexpected situations question four what is a potential issue associated with the traction of empty or lightly loaded trucks a experience better traction on wet surfaces compared to fully loaded trucks B may have poor traction due to bouncing and wheel lock up C have no traction concerns as their weight is evenly distributed D are less affected by wheel lockup due to reduced weight the correct answer is B may have poor traction due to bouncing and wheel lockup empty or lightly loaded trucks may experience poor traction because the reduced weight can lead to bouncing causing decreased Tire contact with the Road Additionally the decreased weight on the axles can result in wheel lock up during braking further affecting the vehicle's traction and control question five when visually inspecting the coupling of a converter Dolly to the rear trailer what is the recommended amount of space between the upper and lower fifth wheel a at least 1 in of clearance B around 3 in of Separation C there should be none D approximately 5 Ines of Gap the correct answer is C there should be none during the coupling of a converter Dolly to the rear trailer the upper and lower fifth wheel should be fully engaged without any space in between this ensures a secure and stable connection between the trailers minimizing the risk of Detachment during operation question six what ction should you take to confirm that you have supplied air to a second trailer a close the emergency line shut off at the rear of the second trailer b go to the front of the first trailer and open the emergency line shut off C keep both emergency line shut offs closed for safety D go to the rear of the second trailer and open the emergency line shut off the correct answer is D go to the rear of the second trailer Traer and open the emergency line shut off to ensure Air Supply to a second trailer go to its rear and open the emergency line shut off valve this step establishes the necessary air connection for brake operation and control between the trailers question seven what is a potential concern with driving speed on a curve for a set of doubles or triples a maybe too fast for a set of doubles or triples B speed should remain consistent with other vehicles C speed should be lowered slightly for improved traction D speed should be maximized for optimal stability the correct answer is a maybe too fast for a set of doubles or triples the driving speed on a curve for a set of doubles or triples needs to be cautious as their longer length and unique handling characteristics may make higher speeds on curves unsafe and increase the risk of a potential rollover or loss of control question eight what accurate statement applies to handling doubles and triples a a sudden movement with the steering wheel can result in a tipped over rear trailer b quick steering movements have minimal impact on the rear trailer of a combination C doubles and triples are immune to tipping over due to sudden steering d double and triple trailers provide increased stability during abrupt steering Maneuvers the correct answer is a a sudden movement with the steering wheel can result in a tipped over rear trailer the extended length and unique dynamics of doubles and triples make them susceptible to tipping over when subjected to sudden steering inputs particularly affecting the rear trailer caution and smooth steering are crucial to prevent potentially dangerous situations question n which part of a triple trailer configuration is most susceptible to the crack the whip effect which can lead to tipping over a the tractor Unit B the middle trailer of the Triple C the rear trailer of a triple D the front trailer of the triple the correct answer is C the rear trailer of a triple the crack the whip effect a phenomenon of increasing lateral instability in articulated Vehicles is most pronounced at the rear trailer of a triple configuration this can potentially lead to tipping over if not managed appropriately question 10 the crack the whip effect a phenomenon of increasing lateral instability in articulated Vehicles is most pronounced at the rear trailer of a triple configuration this can potentially lead to tipping over if not managed appropriately a stopping distance remains consistent regardless of speed B stopping distance increases linearly with speed C stopping distance decreases as speed increases D you need about four times as much stopping distance at 40 mph as you need at 20 mph the correct answer is D you need about four times as much stopping distance at 40 mph as you need at 20 mph the correct statement emphasizes that stopping distance is significantly affected by speed as speed doubles from 20 mph to 40 mph the stopping distance roughly quadruples due to the increased momentum highlighting the importance of maintaining safe following distances and adjusting speed accordingly question 11 when evaluating the coupling of double trailers how should the landing gear of the rear trailer be positioned a fully extended B partially retracted C slightly raised D completely lowered the correct answer is C slightly raised when testing the coupling of double trailers it is recommended to have the landing gear of the rear trailer slightly raised this ensures that the weight of the trailer is appropriately distributed between the coupling mechanism and the landing gear reducing stress on both components question 12 what is the appropriate action to take with the converter Dolly landing gear when disconnecting the rear semi-trailer a lower it slightly enough to reduce some weight from the dolly b a lower it slightly enough to reduce some weight from the dolly C keep it at the current position without any changes D raise it to the maximum height the correct answer is a lower it slight enough to reduce some weight from the dolly when uncoupling the rear semi-trailer it's recommended to lower the converter Dolly landing gear just a bit this action helps alleviate some of the weight on the dolly making the separation process Smoother by reducing tension on the coupling mechanism question 13 what potential outcome can occur when the pintle hook is released while the dolly is still positioned beneath the second trailer a the dolly toe bar will remain secure B the dolly toe bar may fly up C the dolly will be easier to maneuver D the second trailer will disengage automatically the correct answer is B the dolly toe bar may fly up releasing the pinl hook with the dolly still positioned under the second trailer could cause the dolly toe bar to suddenly rise due to the weight transfer this action can be hazardous and May lead to equipment damage or injury if not executed correctly question 14 when attaching a converter Dolly to a second or third trailer how can you determine that the trailer height is appropriate a rear of the trailer is slightly lowered onto the converter Dolly B trailer Rises slightly when the converter dolly is backed under it C trailer is raised significantly above the converter Dolly d converter dolly is tilted to match the trailer's angle the correct answer is B trailer Rises slightly when the converter dolly is backed under it to ensure proper trailer height during the connection process with a converter Dolly you should observe a slight rise in the trailer when the dolly is backed underneath it this confirms that the dolly is properly positioned and aligned for safe coupling question 15 when driving on a slippery Road in daylight what is the recommended guideline from the commercial driving handbook regarding following distance for your truck a maintain the same following distance as on dry roads B allow much more space than is needed for ideal driving conditions C maintain a close following distance for improved traction D keep slightly more space than usual between Vehicles the correct answer is B allow much more space than is needed for ideal driving conditions the Commercial Driving handbook advises that on slippery roads it's essential to allow much more space ahead of your truck than you would in optimal conditions this increased following distance provides extra time to react maneuver safely and account for reduced traction and longer stopping distances question 16 in regular operations what is the primary control for the brakes on a set of double or triple trailers a foot pedal B steering wheel C hand lever D gearshift lever the correct answer is a foot pedal the brakes on a set of double or triple trailers are primarily controlled by the foot pedal also known as the brake pedal this pedal allows the driver to apply braking Force to all the trailers in the comp combination helping to slow down or stop the entire vehicle safely question 17 what is the necessary procedure for supplying air to the air tanks of a second trailer a engage the tractor's parking brake b open the shut off valves at the rear of the first trailer and close the shut off valves at the rear of the second trailer C open the shut off valves at the front of the first trailer D apply the trailer spring brakes the correct answer is B open the shut off valves at the rear of the first trailer and close the shut off valves at the rear of the second trailer to ensure proper air pressure distribution and Brake functionality you should open the shut off valves at the rear of the first trailer and close the shut off valves at the rear of the second trailer before supplying air to its air tanks this sequence allows for controlled air flow and optimal brake response question 18 what is an accurate statement regarding the operation of a set of doubles or triples a aggressive driving Maneuvers enhance stability in doubles or triples b a set of doubles or triples demands careful and smooth driving to prevent rollovers or Jack knives C rollovers and Jack knives are uncommon occurrences in sets of doubles or triples D sudden acceleration and breaking are recommended for maintaining control in doubles or triples the correct answer is b a set of doubles or triples demands careful and smooth driving to prevent rollovers or Jack knives due to the increased length and unique handling characteristics of a set of doublas or triples smooth and cautious driving is essential to prevent dangerous situations like rollovers or Jack nafes sudden movements or abrupt changes in speed can lead to loss of control particularly when navigating turns or challenging road conditions question 19 when connecting a second trailer to your Combination Vehicle what component should you employ to ensure stability a trailer emergency air brakes B Trailer service brakes C tractor's air susp tion D tractor parking brakes the correct answer is a trailer emergency air brakes to establish stability when coupling a second trailer engaging the trailer emergency air brakes help secure the added trailer in place preventing unintentional movement and contributing to the overall safety of the combination vehicle question 20 what is an accurate guideline for managing space to the sides of your vehicle a staying in close proximity to adjacent Vehicles promotes better traffic flow B you should avoid traveling next to others whenever possible C maintaining consistent speed with surrounding traffic enhances Road Safety D driving alongside other vehicles is always the safest approach the correct answer is B you should avoid traveling next to others whenever possible to enhance safety and minimize potential hazards it's advisable to avoid driving alongside other vehicles whenever you have the opportunity this practice provides a buffer zone and reduces the risk of collisions or other incidents question 21 convex or spot mirrors found on certain large trucks have what effect on perception a enhance the magnification of nearby objects B provide a clear view of blind spots C make things look smaller and farther away than they really are D make things look larger and closer than they really are the correct answer is C make things look smaller and farther away than they really are convex or spot mirrors are designed to offer a wider field of view but they also have the effect of making objects appear smaller and more distant than their actual size aiding drivers in estimating the relative distance of other vehicles and object objects question 22 when making a right turn from one two lane two-way street into another with a long truck how should you approach the turn as depicted in the figure a turn close to the inside Lane B swing wide to the left lane C turn near the curb D turn a little over the middle the correct answer is D turn a little over the middle in order to execute a right turn with a long truck from one two lane two-way street to another you should steer a bit towards the center of the intersection allowing the rear trailer to clear the corner before straightening out thus avoiding obstacles and ensuring a safe turn question 23 what is the appropriate arrangement for shut off valves in a set of doubles or triples a open for all shut off valves to ensure consistent air flow B open for the rear of the last trailer and closed for the rear of the front trailers C open for the rear of the front trailers and closed for the rear of the last trailer D closed for all shut off valves to minimize air pressure loss the correct answer is C open for the rear of the front trailers and closed for the rear of the last trailer in a set of doubles or triples maintaining proper air pressure requires that the shut off valves be open at the rear of the front trailers while closed at the rear of the last trailer this setup facilitates balanced air flow throughout the combination ensuring effective brake operation and control question 24 which of the following options is the most effective action to take when encountering a skid a restore traction to the tires B turn the steering wheel sharply C apply the brakes firmly d accelerate quickly the correct answer is a restore traction to the tires when encountering a skid the most effective action is to focus on restoring traction to the tires this can be achieved by releasing the brakes and gently steering in the direction of the skid this helps the tires regain grip on the road surface allowing the driver to regain control of the vehicle and mitigate the skid question 25 what is an accurate statement regarding mirror usage a mirrors are only useful during turns and Lane changes B use the mirrors to look for tire fires C use the mirrors to examine the sky for weather changes D mirrors are unnecessary in clear weather conditions the correct answer is B use the mirrors to look for tire fires one essential use of mirrors is to monitor the wheels of your vehicle for signs of Tire fires especially when driving in hot conditions or when breaking excessively detecting early indications of Tire fires through your mirrors allows you to take immediate action and prevent potentially dangerous situations question 26 in a multi-trailer truck configuration which trailer should be positioned immediately behind the tractor a the heaviest B the the middle one C the lightest D the shortest the correct answer is a the heaviest placing the heaviest trailer closest to the Tractor provides better stability and control for the entire combination this Arrangement helps distribute weight more evenly and reduces the risk of swaying or instability during Maneuvers question 27 during an inspection of couple doubles or triples ensure that the pinl hook s are a latched B lubricated C removed D elevated the correct answer is a latched when conducting an inspection of couple doubles or triples it is essential to confirm that the Pentel hooks are securely latched properly latched Pentel hooks maintain a safe and reliable connection between the trailers ensuring stability and preventing accidental detachment question 28 what is a valid statement concerning the operation of a set of doubles or triples a sudden Maneuvers are recommended to test the combination stability b a set of doubles or triples should be driven faster than other vehicles for improved control C complex driving techniques are unnecessary due to the vehicles design d a set of doubles or triples must be driven very smoothly to to avoid a rollover or jack knife the correct answer is d a set of doubles or triples must be driven very smoothly to avoid a rollover or jack knife the extended length and unique dynamics of a set of doubles or triples make smooth driving imperative to prevent the risk of rollovers or Jack knives abrupt steering acceleration or breaking can destabilize the combination and lead to dangerous situations question 29 when operating a truck with double or triple trailers what specific driving approach should a driver adopt a take special care in bad weather and Mountain conditions B maintain consistent speed for efficiency C engage cruise control for convenience D utilize standard driving procedures the correct answer is a take special care in bad weather and Mountain conditions when driving a truck with double or triple trailers it's imperative for the driver to exercise additional caution particularly when fasing adverse conditions like bad weather and Mountain Landscapes taking Special Care ensures safety and responsible driving behavior in such demanding scenarios question 30 to safely couple a second trailer to your Combination Vehicle what should you use for securing a safety chains B wheel chocks C cargo straps D reflective tape the correct answer is B wheel chocks when coupling a second trailer to your Combination Vehicle it's crucial to use wheel chocks wheel chocks are Essential Safety devices placed behind the wheels of a trailer to prevent it from Rolling during coupling or uncoupling this measure ensures stability and helps prevent accidents during the coupling process question 31 what is the necessary procedure to provide air to the air tanks of a second trailer a open the shut off valves at the front of the first trailer and close the shut off valves at the rear of the second trailer b close the shut off valves at the front of the first trailer and open the shut off valves at the rear of the second trailer C open the shut off valves at the rear of the first trailer and close the shut off valves at the front of the second trailer D open the shut off valves at the rear of the first trailer and close the shut off valves at the rear of the second trailer the correct answer is D open the shut off valves at the rear of the first trailer and close the shut off valves at the rear of the second trailer to Supply Air to the air tanks of a second trailer it's essential to open the shut off valves at the rear of the first trailer while closing the shut off valves at the rear of the second trailer this ensures the proper flow of compressed air between the trailers allowing for Effective brake operation and control question 32 if the pinl hook is disengaged while the dolly remains positioned under the second trailer what is the potential outcome a the dolly toeb bar may fly up B the dolly will Collapse c the combination will remain unaffected D the trailer will detach immediately the correct answer is a the dolly toe bar may fly up unlocking the pinl hook while the dolly is still beneath the second trailer can lead to an abrupt shift in weight distribution causing the dolly toe bar to unexpectedly rise posing a hazard and potential danger to surrounding traffic and Equipment question 33 what action should you take to confirm that you have provided air to a second trailer a go to the rear of the second trailer and open the emergency line shut off B check the tractor's air tank pressure only C listen for a hissing sound from the trailer's tires D wait for the air pressure gauge to reach maximum reading the correct answer is a go to the rear of the second trailer and open the emergency line shut off to ensure proper air supply to a second trailer you can verify by going to the rear of the second trailer and opening the emergency line shut off valve this procedure establishes the necessary air connection for brake operation and control between the trailers question 34 what is a correct practice when connecting a set of doubles or triples a use excessive force when coupling the dolly to ensure a tight connection B place the pintal ey of the dolly higher than required for better stability C avoid checking the pintal ey placement while coupling D when coupling a set of doubles or triples be sure the pintal ey of the dolly is in the proper place the correct answer is D when coupling a set of doubles or triples be sure the Pinal ey of the dolly is in the proper place ensuring the correct placement of the pinali ey of the dolly during coupling is crucial for maintaining a safe and secure connection between trailers this practice helps prevent issues such as misalignment excess stress on components and potential Detachment during operation question 35 what is an indicator that the trailer height is suitable for coupling a converter Dolly to a second or third trailer a the trailer is touching the ground B the trailer will be raised slightly when the converter dolly is backed under it C the trailer is resting on the dolly D the trailer is tilted forward the correct answer is B the trailer will be raised slightly when the converter dolly is backed under it when checking trailer height before connecting a converter Dolly a slight elevation of the trailer when the dolly is backed under it signals that the height is appropriate for secure coupling ensuring a proper fit between the components question 36 during a walk around inspection of a double or triple trailer rig what are the appropriate stat for the converter Dolly air tank drain valves and the Pinal hook a partially open locked B sealed engaged C closed unlatched D closed latched the correct answer is D closed latched in a walk around inspection of a double or triple trailer rig you should ensure that the converter Dolly air tank drain valves are closed to maintain air pressure and the pintal hook is latched securely to prevent Detachment promoting safe and reliable operation question 37 while operating a set of doubles what is the probable outcome if a set of trailer wheels enters a skid a the trailer will regain traction instantly B you will have a trailer jack knife C the trailer will stay aligned with the tractor D the tractor will skid along with the trailer the correct answer is B you will have a trailer jack knife when a set of trailer wheels goes into a skid it can lead to a loss of traction and control potentially resulting in the trailer swinging out of alignment with the tractor and causing a trailer jack knife situation question 38 what component does a converter Dolly Feature A A specialized brake system b a retractable axle C an auxiliary fuel tank d a separate Air Supply tank the correct answer is d a separate Air Supply tank a converter dolly is equipped with its own dedicated Air Supply tank which allows for Effective braking control and air pressure distribution when operating a combination of trailers this tank ensures proper functionality of the air brake system throughout the entire multi-trailer setup question 39 while operating a vehicle with double trailers if you need to employ your brakes to avert a collision what braking technique is recommended for emergency situations a use controlled or stab braking B gradually increase brake pressure to slow down C apply sudden and full braking Force D rely on the engine brake for immediate stopping the correct answer is a use controlled or stab braking in an emergency braking scenario with double trailers controlled or stab braking involves applying firm controlled brake pressure to avoid instability while slowing down efficiently reducing the risk of Jack knifing or loss of control question 40 while operating a 100t twin trailer combination at 50 mph on a dry road with good visibility what is the recommended minimum following distance in seconds a 5 b 8 C 11 D 10 the correct answer is C 11 to maintain a safe distance and allow ample time for reaction and braking it is advised to maintain at least an 11-second gap between your vehicle and the one ahead in these conditions question 41 in reference to coupled and triple trailers what position should the air tank drain valve on the converter Dolly be in a partially open B fully open C sealed D closed the correct answer is D closed it is essential to ensure that the converter Dolly air tank drain valve is closed when dealing with coupled and triple trailers keeping the valve closed prevents air pressure loss from the air tank thereby maintaining proper brake functionality and control question 42 what is a valid observation regarding maintaining forward vision a focusing solely on the immediate road ahead provides the best view B keeping your attention solely on the road far ahead is the most effective approach C good drivers shift their attention back and forth near and far D concentrating solely on objects near the vehicle ensures optimal visibility the correct answer is C good drivers shift their attention back and forth near and far effective forward Vision involves regularly alternating your focus between close objects and the road far ahead this practice allows good drivers to anticipate and react to potential hazards both nearby and in the distance contributing to overall safety and situational awareness question 43 while operating a 100ft twin trailer combination at 50 m pH on a dry road with good visibility what is the recommended minimum following distance in seconds a 5 b 8 C 10 D 11 the correct answer is D 11 to ensure safe driving and allow sufficient time for braking and reaction it is advised to maintain a following distance of at least 11 seconds when driving a 100t twin trailer combination under these conditions question 44 what is the antici ipated outcome if a set of trailer wheels begins to Skid while driving a set of doubles a the trailer will jack knife B the trailer will continue to maintain traction and stability C the trailer will roll over due to the skidding motion D the trailer will stay straight without any issue the correct answer is a the trailer will jack knife when trailer Wheels start to Skid it can lead to a loss of traction and control resulting in the trailer swinging out of alignment with the tractor this motion can lead to a jackk knife scenario where the trailer forms an acute angle with the tractor potentially causing a dangerous situation on the road question 45 when operating a truck with a set of double or triple trailers what is a crucial guideline for maintaining safe following distances a maintain equal following distance as small smaller Vehicles b reduce following distance to improve traffic flow C allow more following distance than for smaller Vehicles D keep the same following distance as for passenger cars the correct answer is C allow more following distance than for smaller Vehicles due to the increased length and weight of a truck with double or triple trailers it is essential to keep a larger following distance to ensure sufficient time for safe breaking and maneuvering minimizing the risk of collisions and enhancing overall safety question 46 in a multi-trailer configuration what should be the order of trailers positioned immediately behind the tractor a the heaviest B the middle one C the lightest D the shortest the correct answer is a the heaviest placing the heaviest trailers closest to the Tractor helps distribute weight and enhances stability for the entire combination this Arrangement AIDS in maintaining control and preventing swaying during operation question 47 what is a characteristic commonly associated with converter dollies a are equipped with automatic transmission B often do not have spring brakes C are designed for off-road use only D come with Advan collision avoidance systems the correct answer is B often do not have spring brakes converter dollies frequently used in multi-trailer configurations often lack spring brakes this feature makes them reliant on the Air Supply from the tractor to ensure proper braking function emphasizing the importance of proper coupling and Air Supply question 48 when operating a truck with a set of double or triple trailers what is a key consideration for maintaining maining safe following distances a maintain the same following distance as smaller Vehicles b follow closely to reduce wind resistance C maintain a consistent speed with nearby traffic D allow more following distance than for smaller Vehicles the correct answer is D allow more following distance than for smaller Vehicles due to the increased length and weight of a truck with double or trip trailers it's crucial to allow a greater following distance compared to smaller Vehicles this extra space provides sufficient time for safe breaking and maneuvering reducing the risk of collisions question 49 which of the following statements is true about quick steering movements with a set of doubles or triples a a set of doubles or triples is less susceptible to rollovers during quick steering B quick steering movements have no impact on the stability of a set of of doubles or triples c a set of doubles or triples turn over easily than other vehicle combinations D quick steering Maneuvers are recommended for a set of doubles or triples to maintain control the correct answer is c a set of doubles or triples turn over easily than other vehicle combinations a set of doubles or triples can be challenging to control during quick steering Maneuvers due to their increased susceptibility to tipping over the longer overall length and and multiple trailers of these combinations make them more prone to the crack the whip effect where the rear trailers may swing wide in response to Sharp steering potentially leading to a rollover if not managed carefully question 50 when securing your combination to a second trailer without spring brakes and without wheel chocks what is the appropriate procedure a apply the tractor spring brakes and disconnect the trailer emergency line B charge the trailer air tank and then disconnect the emergency line C connect the trailer emergency line and apply the tractor spring brakes D release the trailer parking brake and connect the emergency line the correct answer is B charge the trailer air tank and then disconnect the emergency line to secure a combination to a second trailer lacking spring brakes and wheel chocks it's advised to charge the trailer air tank which will hold the trailer in place and then disconnect the emergency line to prevent the trailer from moving unexpectedly question 51 while operating a 100t truck with double trailers at 30 mph on a dry road with good visibility what is the recommended minimum following distance in seconds a 5 b 7 C 10 D 12 the correct answer is C 10 to ensure safe driving and provide sufficient time for braking and reaction maintaining a following distance of at least 10 seconds is advisable when operating a 100t truck with double trailers under these conditions question 52 what is the appropriate configuration for shut off valves on a set of doubles or triples a closed for all trailers to ensure uniform air pressure B open for all trailers to enhance brake responsiveness C open for the rear of the front trailers and closed for the rear of the last trailer D open for the rear of the last trailer and closed for the rear of the front trailers the correct answer is C open for the rear of the front trailers and closed for the rear of the last trailer in a set of doubles or triples maintaining the shut off valves open at the rear of the front trailers and closed at the rear of the last trailer promotes effective air pressure distribution ensuring proper brake function and control throughout the combination question 53 what is the recommended procedure for securing your combination to a second trailer lacking spring brakes and without using wheel chocks a connect the emergency line and charge the trailer air tank B charge the trailer air tank and then disconnect the emergency line C apply the tractor spring brakes and disconnect the trailer emergency line D release the trailer parking brake and connect the emergency line the correct answer is B charge the trailer air tank and then disconnect the emergency line in the absence of spring brakes and wheel chocks charging the trailer air tank and then disconnecting the emergency line provides a reliable method for securing the combination preventing movement while ensuring pressure is maintained question 54 in reference to couped double and triple trailers what position should the air tank drain valve on the converter Dolly be in a partially open B fully open C closed D sealed the correct answer is C closed for coupled double and triple trailers it's essential to keep the conver conver Dolly air tank drain valve closed this prevents the loss of air pressure from the air tank ensuring proper brake operation and maintaining control of the trailer combination question 55 in the context of coupled double or triple trailers what is the recommended status for all converter Dolly shut off valves a closed B locked C open D disconnected the correct answer is C open for couple double or triple trailers it's important to keep all converter Dolly shut off valves open to allow proper air flow to the trailer brake systems this ensures that the trailer brakes function in coordination with the towing vehicle maintaining safe braking performance across the entire combination question 56 while operating a set of doubles what is the most probable consequence when a set of trailer wheels begins to skip a the trailer will jack knife B the trailer will automatically correct itself C the vehicle will maintain stability D the trailer will experience improved traction the correct answer is a the trailer will jack knife when a set of trailer wheels starts to skip it can lead to a loss of traction and control increasing the likelihood of the trailer jack knifing this situation is potentially dangerous and requires prompt corrective action to prevent an accident question 57 what is the appropriate action to take with the converter Dolly landing gear when disconnecting the rear semi-trailer a fully extend it until it touches the ground B raise it to the maximum height C keep it at the current position without any changes D lower it slightly enough to reduce some weight from the dolly the correct answer is D lower it slightly enough to reduce some weight from the dolly when uncoupling the rear semi-trailer it's recommended to lower the converter Dolly landing gear just a bit this action helps alleviate some of the weight on the dolly making the separation process Smoother by reducing tension on the coupling mechanism question 58 if the pinl hook is disengaged while the dolly remains positioned under the second trailer what could potentially occur a the dolly will automatically detach from the second trailer b the dolly toe bar may fly up C the combination will become more stable D the rear trailer will be released from the dolly the correct answer is B the dolly toe bar may fly up unlocking the pental hook with the dolly still beneath the second trailer can lead to the dolly toe bar suddenly Rising due to weight transfer which poses a safety hazard and the risk of equipment damage or injury question 59 what accurate statement pertains to Quick steering movements and doubles triples a doubles triples require less steering effort than other vehicles B quick steering movements are safer for doubles triples than for single trailers C doubles triples flip over from Quick steering movements more easily than do many other vehicles d doubles triples exhibit better stability during rapid steering actions the correct answer is C doubles triples flip over from Quick steering movements more easily than do many other vehicles the extended length of doubles triples makes them more susceptible to rollovers when subjected to abrupt steering Maneuvers emphasizing the need for cautious and smooth steering to prevent the risk of tipping over question 60 when testing trailer brakes with the hand valve engaged what sound or effect should you expect upon opening the service line valve at the rear of the rig a a sudden jolt from the trailer b the engine revving up C air escape from the open valve d a strong odor of burning rubber the correct answer is C air escape from the open valve when conducting a brake test with the hand valve engaged opening the service line valve at the rear of the rig should result in the sound of air escaping indicating that the trailer brakes are functioning as expected 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: IxJQp3dwdZ0

Length: 47min 44sec (2864 seconds)

Published: Sun Mar 17 2024