when driving a truck with more than one trailer, which trailer should be first behind the truck? Which of the following statements about off tracking is true? Go to the rear of the rig. which of these statements about the handling of doubles and triples is true ? retrovirus $_____________________________$. kingpin. What is most likely to happen if the trailer protection valve of a double or triple trailer does not function correctly? When checking the coupling system, make sure that the locking jaws are around the shank of the. However there are some states that allow doubles that are each 48 feet in length. The Doubles and Triples written CDL Exam is required for your doubles and triples endorsement. 2. A B. pull gently against the pin of the second semitrailer B. you need about four times as much stopping distance at 40 mph as at 20 mph You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. You must treat a flashing red signal as you would treat a STOP sign. You should keep at least ___ seconds of space ahead of you. B You must check that all shut-off valves are in the open position except the ones at the back of the last trailer, which must be closed. 4. Ideal for replacing a worn, leaky drain valve on a compressor. To do this without wheel chocks you should: When uncoupling the rear semitrailer, you should lower the converter dolly landing gear: When driving a double or triple, you need more space because they: Which of these statements about emergency steering is true? Follow the procedures described later in this section. Which of the following is true about loading cargo into double or triple trailers? It is important not to let water and oil build up in the air tanks. A coupling device of one or two axles and a fifth wheel by which a semitrailer can be coupled to the rear of a tractor-trailer combination forming a double bottom rig Should the shut off valves on the rear of the first trailer be open or closed on a set of double trailers? A full trailer behind a truck driven with care to avoid losing control, Make sure the spare tire is secured, if it has one, Make sure the converter dolly air tank drain valve is closed, Make sure safety chains are secured to the trailers, All of the above. CDL Doubles and Triples Test Question and Answers Before coupling a trailer, you should make sure it is at the right height using? Seriously! What is a converter dolly? There is no obligation whatsoever. You are doing a walk around inspection of a double or triple trailer rig. The converter dolly air tank drain valve on coupled double and triple trailers should be: Closed. Stay up to date on truck driving industry news. DOUBLE/TRIPLE CDL Flashcards | Chegg.com A Leave a Reply Cancel reply - Free CDL Practice Tests 2022 B. you can almost always stop more quickly than you can turn A) closed . 0000005733 00000 n When only pulling one trailer, be sure the shut-off valves are all in the fully closed position. Open the emergency line shut-off valve at the rear of the last trailer. PDF Doubles and triples 1. The stopping distance for a tractor trailer B. johnson bar The DMV doubles triples practice test will examine your knowledge of pulling double/triple trailers, coupling and uncoupling, inspecting doubles and triples, and checking air brakes. You are visually checking the coupling of a converter dolly to the rear trailer. When driving doubles or triples how should they be driven to avoid rollover or jackknifing: Mar 2 - Mar 3. You will speak with recruiters today. Double and Triples Part 1 Flashcards - flashcardmachine.com The last trailer in a combination is most likely to turn over. Trailer Air Tanks And Shutoff Valves - Page 50. B. you should avoid traveling next to others whenever possible Often do not have spring brakes A. the total stopping distance of a truck is the distance it takes to stop once the brakes are put on at any speed You MUST have air all the way to the back for all the brakes to work. How can you be sure you supplied air to a second trailer? Which of the following will occur? After 15 years on the road I wanted to help people understand the trucking industry and everything that came with the career and lifestyle of an over the road trucker. D Any trailer, 7. Pull gently against the pin of the second trailer. You should keep at least _____ seconds of space ahead of you: You are driving with double trailers and must use your brakes to avoid a crash. If the spring brakes do not release when you push the trailer air supply control, check the air line connections. To uncouple the rear trailer in a set of doubles, the shut-off valve at the rear of the front trailer should be: Closed. Why should you check for when inspecting the converter dolly? You are driving with double trailers and must use your brakes to avoid a crash. Always test the trailer brakes before driving with the hand valve or by pulling the air supply (tractor protection valve) control. [California Commercial Driver Handbook] The weight of a truck: Is a major factor affecting stopping distance. They provide the air pressure used to operate trailer brakes. Try our free CDL Doubles and Triples Test Question and Answers Quiz online. This means. Should the shut off valves on the rear of the first trailer be open or closed on a set of double trailers? The braking systems of double and triple trailers are different than those of straight trucks because doubles and triples. You should keep at least ____ seconds of space ahead of you. The driver must yield the right-of-way to other vehicles when merging and when entering a highway from an alley. Leave the emergency line shut-off valve closed and open the service line valve. If you are driving a 200-foot triple at 35 mph, what is the minimum amount of space (in seconds) that you should keep ahead of you? There is a school zone ahead. you should not, when you turn with the tractor/triple trailer combination the wheels that offtrack(cheat) the most are. You should keep at least _____ seconds of space ahead of you. What does the drivers manual say about how much space you should keep ahead of your truck? Blue is used for the service lines, and red for the emergency (supply) lines. 2. C. the service brakes slowly move to the fully applied position, Some large trucks have converted or "spot" mirrors. When uncoupling a rear trailer, your rig should be parked in a straight line on? Which of the following must be connected when coupling tractor to trailer or trailer to trailer? 27. The dolly will have a yellow lamp on the drivers (left) side. cQ 220rd8bihuM#Om>G*Lz)g^\l9'A9/omf|b49U[@%jGT-QR6i. When you go to the rear of the last trailer, what should you do to complete this check? By clicking the ["Send"] button, you agree to our Terms of Use and Privacy Policy, and to the use of cookies described therein, and you also consent to the collection, storage, and processing of your data in the United States where the level of data protection may be different from that in your country. Ensuring the safety of the public starts with a thorough inspection of all equipment. 10. Any combination of vehicles with a gross combined weight rating (GCWR) of 26,001 or more pounds, providing the gross vehicle weight rating (GVWR) of the vehicle being towed is in excess of 10,000 pounds. You should NOT: You are driving a set of doubles and a set of trailer wheels goes into a skid. Be more careful in adverse conditions. How do you check to make sure trailer height is correct before coupling? When uncoupling the converter dolly Why should you never unhook the rear brakes will not work properly. What happens if you cross the Emergency Air Line and the Service Air Line? "Glad hands" are coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer. D you are doing a walkaround inspection of a double or triple trailer rig. A. closed; latched There are more things that can go wrong, and doubles/triples are less stable than other commercial vehicles. A. opening the air tank petcock How should you test the coupling? Which of these is most likely to occur? A vehicle transporting hazardous materials is required to display placards where? A bent or damaged kingpin on a coupling should be? When connecting the glad hands, press the two seals together with the couplers at a 90-degree angle to each other. A connection device of one axle used to disconnect a semitrailer combination vehicle Converter dolly air tank drain valve: CLOSED. Definition. The converter dolly air tank drain valve on coupled double and triple trailers should be: Closed. When you do this, you should hear: Which of these statements about emergency steering is true? You are doing a walk around inspection of a double or triple trailer rig. The pressure in the service line is controlled by the brake pedal and the trailer hand brake. fifth wheel, so trailer is raised slightly when dolly is pushed under it. A It is very important to keep the air supply clean. How much space should be between the upper and lower fifth wheel? 1. the converter dolly air tank drain valve on couple double/triple trailers should be: to check if the converter dolly is securely coupled to the rear trailer you should: pull gently against the pin of the second trailer. While doing a walkaround inspection of a double or triple, the converter dolly air tank drain valve should be _____, and the pintle hook should be _____. D. Make sure the spare tire is secured, if it has one. The road is dry and visibility is good. A CDL is required to drive any of the following vehicles: A vehicle with two separate parts - the power unit (tractor) and the trailer. The rear trailers shut-off valves should be open and the front closed. When the road is dry The dolly tow bar may flip up causing bodily injury and making it very difficult to Air pressure is sent from the air tanks to the brakes by relay valves. C. closed, You can release the dolly brakes by: Make sure you can hear air escaping with the valve closed. Doubles/Triples Air Brake Check - digital.ncdcr.gov Hit the article to see the way to back up your trailer like a pro! Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? c. iron The lighter trailer should be in the rear. a sudden movement with the steering wheel can result in a tipped over rear trailer, you wish to turn right from one two-lane, two-way street to another. Flammable materials in the front trailer then it must have the placards on that trailer. 0000005664 00000 n not have spring brakes. during normal operation the brakes of the double/triple trailer are controlled by : which of these will result in the best control on curves? A. use light, steady pressure on the brake pedal These mirrors: Any trailer with a reduced ground clearance Before you can supply air to the air tanks of a second trailer you need to. D symptoms of a bad fuel tank selector switch. A. brake and downshift in a curve True False True If you want to couple a second trailer to you combiantion vehicle, secure it by using the: Trailer emergency air brakes. inspection of all equipment. Converter dollies: B Nothing will happen, but an in-cab warning indicator will let you know about the problem, It will cause the tractor protection valve to close and the trailer emergency brakes to come on, It will cause the tractor protection valve to open and the trailer emergency brakes to come on, When you try to put the service brakes on, air will quickly leak and will lower the air tank pressure, possibly activating the trailer emergency brakes, The emergency brakes will come on automatically as soon as a major leak occurs, Nothing, but braking power will be reduced, Air pressure will quickly leak away, even if you are not using the service brakes, Using a combination of the emergency air line and the service air line, Supply air will be sent to the service line instead of going to charge the trailer air tanks which means the trailer spring brakes will not release, Newer vehicles automatically detect if the lines are crossed and will auto-correct itself, Air will continue filling the air holding tanks until the tanks rupture from excessive pressure, Supply air will cause all brakes to release and the truck will roll freely without any braking ability, Trailers typically do not have their own air tanks, Designed to turn off the truck engine when a brake failure occurs, Used in the service and supply air lines at the back of trailers used to tow other trailers, Placed at each trailer spring brake and are designed to engage the emergency brakes when air pressure becomes too high, The yellow and red air control knobs located in the cab of a truck, Used to secure the trailer kingpin to the tractor 5th wheel, Caps which cover the valve stems on tires, A name for the yellow and red air valves in the cab of a truck, Coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer, Email Updates When New Articles Are Posted. you are driving on a slippery road during the day. Doubles and triples are more likely to turn over than other combination vehicles because of the "crack-the-whip" effect. A low air buzzer will go off indicating something is wrong and either the front or the Always unlock the pintle hook with the dolly still under the rear trailer. HlTo xGf`{iIMh-x||?pbE':X4ZZZRbu7 uvi_RHUkVXBVu{^B3 4e/iw\]RE] YY7i)e V*h(++WQ-]Xm9c5yU6BS" 5HiL,[b)ee:t/ )%BVGpU7T\ZJD If the dolly is a two axle unit then 1 open, closed, closed: Term. On a triple combination, the shutoff valves on the rear of the last trailer should be? Simply click in your answer to each CDL practice test question. In this order, the shutoff valves at the rear of front trailers, the rear of the last trailer and the converter dolly air tank drain valve should be? 0000001956 00000 n The dolly tow bar may fly up, possibly causing injury, and making it very difficult to The final procedure when connecting a rear trailer is to? Push the brake pedal as hard as you can and hold it there Connect Converter Dolly to Rear Trailer Make sure trailer brakes are locked and/or wheels chocked. Seriously! Open weather passes. 0000010306 00000 n What three methods can you use to secure a second trailer before coupling? A safe speed on a curve for a straight truck or a single trailer combination vehicle may be too fast for a set of doubles or triples. C The air lines will rupture Air escape from the open valve You should be sure the converter dolly air tank . A. release the spring brakes and check for movement How To Use Cruise Control Effectively As A Truck Driver. The road is dry and visibility is good. Number of wrong answers. utilize the brakes. There is no requirement or exact standard for color coding. Lock pintle hook. Time used (Requires timer add on). Chock the tires, park on level ground and charge the trailer air tank if it does Our normal business hours are Monday-Friday 8 a.m. to 5 p.m. (Pacific Time). The trailer brakes will unlock How can you test that air flows to all trailers? 0000003060 00000 n You should keep at least ____ seconds of space ahead of you. Which is most likely to tip over: What will happen if there is a major leak in the service air line? 10 Should the converter dolly air-tank drain valve be open or closed on a double trailer combination? Make sure the converter dolly air tank drain valve is closed. A. you can steer more quickly and safely if you hold the wheel with one hand Open. CDL License Requirements State By State. The crack the whip effect that troubles trucks with trailers. 5. On a triple combination, the shutoff valves at the rear off the middle trailer should be? how much space should be between the upper and lower fifth wheel? Disconnect the glad-hand at the front of the first trailer and listen for air flow. They are filled by the emergency (supply) line from the tractor. The tanks will hold enough air to allow the brakes to be used several times even if the compressor stops working. B. use only the trailer brakes C. back up slightly and make a visual check of the coupling, You are driving with double trailers and must use your brakes to avoid a crash. Converter dolly air tank drain valve: CLOSED Air lines supported and glad hands properly connected. You must steer gently when pulling trailers. They provide the air pressure used to operate trailer brakes. 9. A. allow "much more space" than is needed for ideal driving conditions Air valves should be closed on all trailers, Air valves should be open on all trailers, Rear of front trailers: closed, rear of last trailer: open, Rear of front trailers: open, rear of last trailer: closed. The converter dolly is an auxiliary axle with a coupling device. . The best way to keep brakes from getting to hot while going down long grades is to: Go slow and use only light, steady pressure on the brakes. Tractor-trailers are considered combination vehicles. air throughout the system. 2023 PA Doubles - Triples CDL Practice Test 3 - CristCDL.com When you do this, you should hear: Ais escape from the open valve. A converter dolly is still under the second trailer when you unlock the pintle hook. Allow much more space than is needed for ideal driving condition. Stop the vehicle by gearing down and sparingly High Road 2.0! converting it into two trailers, A coupling device of three or four axles and a fifth wheel by which a semitrailer can Make sure pintle hook is latched. None A sudden movement with the steering wheel can result in a tipping over rear trailer. doubles/triples flip flop over from quick steering movements more easily than many other vehicles. C. make things look larger and closer to you than they really are, When hauling triple trailers at a speed less than 40 mph, you should leave at least _____ second(s) for every ten feet of your truck between you and the vehicles ahead of you. Join 50,000+ users around America to get your Commercial Driver License today! The service brakes slowly move to the fully applied position 0000008894 00000 n CDL Practice Tests 2023 - Doubles And Triples When uncoupling a rear trailer, you should remove some weight from the dolly by? you are driving a 100ft truck eith double trailers at 50mph. 11 During normal operation the brakes of the double/triple trailer are controlled by: The A-dolly has a single drawbar with a single, centered hitching point. A If you want to couple a second trailer to your combination vehicle, secure it by using: The crack-the-whip effect that troubles trucks with trailers is most likely to cause a tip over: You are driving on a slippery road during the day. What types of trailers can get stuck on raised crossings? 0000006195 00000 n you should keep atleast __seconds of space ahead of you. d. protein. Why should you use chocks when parking a trailer without spring brakes? All rights reserved Site Map. You will not be tested on uncoupling twins unless you want to get a double/triple trailer endorsement on your license. Do converter dollies have spring brakes? A green traffic light allows the driver to go. C. if you have traffic on both sides of your vehicle and something is blocking your lane, a move to the right may still be best, To uncouple the rear trailer in a set of doubles, the shut-off valve at the rear of the front trailer should be: Air will not be available to release the trailer spring brakes (parking brakes). If you're only pulling one trailer, the shut off valves should always be closed or else the air will simply escape out the back of the trailer. ), a 15 year truck driving veteran, in January 2007. During normal operation the brakes of the double/triple trailer are controlled by: You are driving at night and you must dim your headlights for traffic. recouple. You should be sure the converter dolly air tank drain . A dolly is like a very short trailer, with a ring hitch on the front and a fifth wheel on top. C Which of these is NOT a good thing to do when driving on slippery roads? The application only takes one minute. Doubles and triples are more likely to turn over than other combination vehicles because of the "crack- the-whip" effect. the crack-whip effect that triubkes trucks with trailers is most likely to cause a tip over when. Study section 6.2 if you can't answer all of these questions. A. open the shut-off valves at the rear of both trailers You are driving a 100 ft twin trailer combination at 50 mph. 0000005554 00000 n B. closed B B. allow one vehicle length for every 10,000 lbs of gross vehicle weight Our business address is: Attn: Class A Drivers MH Sub I, LLC dba Internet Brands 909 N Pacific Coast Highway, 11th Floor El Segundo, CA 90245. 0000003977 00000 n A major leak in the emergency line will cause the tractor protection valve to close and the trailer emergency brakes to come on. Closed, free, 8. Dont hesitate to take advantage of our practice tests in each category specific to your needs. When the road is slippery These valves permit closing the air lines off when another trailer is not being towed.
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