A converting it into two trailers, A coupling device of three or four axles and a fifth wheel by which a semitrailer can 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? When uncoupling the converter dolly Why should you never unhook the Doubles/Triples Air Brake Check - digital.ncdcr.gov the rig will continue moving in a straight line no matter how much the steering wheel is turned. C. always keep your vehicle to the left side of your lane, When testing the coupling of double trailers, the landing gear of the rear trailer should be: There are more critical parts to check when you have two or three trailers. We are an independent company focused on providing valuable motor vehicle and permit practice test information. A. closed; latched The converter dolly air tank drain valve on coupled double/triple trailers should be: Closed. Related Question Question: What does this sign mean? C paramount to safe driving. The road is dry and visibility is good. The application only takes one minute. In normal operation, trailer service brakes should be operated by? b. cell C. close the shut-off valves at the rear of the first trailer and open the shut-off valves at the rear of the second trailer, To check that the converter dolly is securely coupled to the rear trailer, you should: Explore now! Driving doubles/triples is also more dangerous in hot and cold weather driving, as well as on mountain roads. A full trailer behind a truck The pressure in the service line is controlled by the brake pedal and the trailer hand brake. When checking the coupling system, make sure that the locking jaws are around the shank of the. Converter dolly air tank drain valve: CLOSED. Make sure you have large enough gaps before entering or crossing traffic. When only pulling one trailer, be sure the shut-off valves are all in the fully closed position. Should the shut-off valves on the rear of the last trailer be open or closed? Sketch the shape of the passage between sections 1 and 2. For emergency braking you should: which of these statements about emergency steering is true? Which of these is the correct answer? How do you check to make sure trailer height is correct before coupling? - Converter dolly air tank drain valve: CLOSED. You should keep at least ____ seconds of space ahead of you. True! For emergency braking you should: A Push the brake pedal as hard as you can and hold it there B A sudden movement with the steering wheel can result in a tipping over rear trailer. the crack-whip effect that triubkes trucks with trailers is most likely to cause a tip over when. _______ should be tested with the hand valve but controlled in normal operation with the foot pedal. When uncoupling a rear trailer, your rig should be parked in a straight line on? B Ensuring the safety of the public starts with a thorough Correct answer percentage. Then, the air loss from the leak will lower the air tank pressure quickly. 1 The total number of questions. be coupled to the rear of a tractor-trailer combination forming a hexagon bottom rig, A coupling device of one or two axles and a fifth wheel by which a semitrailer can be By using this site, you agree to be bound by our Terms of Use, Privacy Policy and Cookie Policy, Copyright 2000-2023 MH Sub I, LLC dba Internet Brands. if you have traffic on both sides of your vehicle and something is blocking your lane, a move to the right still be best. Before coupling a trailer, you should make sure it is at the right height using? We are here to help. Simply click in your answer to each CDL practice test question. You should keep at least ____ seconds of space ahead of you. 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: Safety should never take second place, so know your stuff! Number of wrong answers. Why should you not use the trailer hand valve while driving? These dollies will have a yellow lamp on the left side of the dolly. Sometimes, metal tags are attached to the lines with the words service and emergency stamped on them. You should be sure the converter dolly air tank drain valves are _____ and the pintle hook is ____. A. for coupled doubles and triples, be sure that the pintle hook is in the open position axle will have spring brakes due to the weight of the unit. 4. When does the "driver's manual" advise disconnecting the steering axle brakes to help keep the rig straight? View the full article to see how to set cruise control correctly! However, converter dollies and trailers built before 1975 are not required to have spring brakes. What three methods can you use to secure a second trailer before coupling? The Doubles and Triples written CDL Exam is required for your doubles and triples endorsement. Before you can supply air to the air tanks of a second trailer you need to. Visually check to make sure that the lead trailer is slightly higher than the center of You must steer gently when pulling trailers. Flammable materials in the front trailer then it must have the placards on that trailer. What types of trailers can get stuck on raised crossings? 0000007508 00000 n Double and Triples Endorsement Flashcards 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. For emergency braking you should: You are doing a walk around inspection of a double or triple trailer rig. A. brake and downshift in a curve Which of these statements about the handling of doubles and triples is true? Also available in App Store & Google Play. Definition. Be sure pintle-eye of dolly is in place in pintle hook of trailer(s). Unless you are draining the condensation out of the air tank, then the drain valve If the dolly is a two axle unit then 1 What do you check when making a visual check of coupling? The dolly will have a yellow lamp on the drivers (left) side. When you do this, you should hear: you should keep atleast __seconds of space ahead of you. You may not notice a major leak in the service line until you try to put the brakes on. If you leave this page, your progress will be lost. This means. The road is dry and visibility is good. Speed for other vehicles is often too fast for a multi-combination unit! The number and size of air tanks varies among vehicles. When coupling twin trailers, a converter dolly is. They provide the air pressure used to operate trailer brakes. When entering a roundabout, a driver must yield the right-of-way to drivers already in the roundabout and obey all traffic signs. [California Commercial Driver Handbook] The weight of a truck: Is a major factor affecting stopping distance. What should you check for when inspecting a converter dolly? C. fully raised, Which of these statements about speed management and braking is true? B. keep other traffic out of your side space While inspecting your converter dolly coupling, you should make sure there is _____ between the upper and lower fifth wheel. B When connecting two trailers the converter dolly is connected to the rear trailer first. to do this without wheel chocks you should: supply air to the trailer air system with the tractor and then disconnect the emergency line. What is a converter dolly? You are doing a walk around inspection of a double or triple trailer rig. What will happen if there is a major leak in the service air line? Allow more following distance. B How To Use Cruise Control Effectively As A Truck Driver. D On a triple combination, the shutoff valves on the rear of the last trailer should be? 0000010705 00000 n which of these statements about quick steering movements and doubles/triples is true? The dolly tow bar may fly up, possibly causing injury, and making it very difficult to 7.3 Inspecting Doubles and Triples = Additional Things to Check During a Walkaround Inspection. When does the "driver's manual" advise disconnecting the steering axle brakes to help Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? your vehicle is so long that you must swing wide to make a turn. Remember: The trailer air brakes are supplied with air using the emergency line (also called the supply line). What is a converter dolly? | Samsara Shut-off valves (also called cut-out cocks) are used in the service and supply air lines at the back of trailers used to tow other trailers. The converter dolly air tank drain valve on coupled double and triple trailers should be: Closed. A 360 degree area of awareness is A. The last trailer in a combination is most likely to turn over. 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. When coupling, be sure to couple the proper glad hands together. Trailer Air Tanks And Shutoff Valves - Page 50. The number of correct answers. "Glad hands" are coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer. When you're finished, check your score and results. B. for doubles and triples, the fifth wheel should be all the way towards the tractor C. use a light touch on the accelerator and brake pedals, For coupled double and triple trailers, all of the converter dolly shut-off valves should be: A converter dolly is If a converter dolly has spring brakes, you release the brakes by You have connected the converter dolly to the front semitrailer and then connected the rear semitrailer to the converter dolly. Leave a Reply Cancel reply - Free CDL Practice Tests 2022 Unlock the pintle hook only if the trailer it is under is loaded, otherwise the dolly tow bar may fly up, possibly causing injury and making it very difficult to re-couple. Select the answer that correctly completes each statement. Push the brake pedal as hard as you can and hold it there You will have greater length and more dead axles to pull with your drive axles than other drivers. 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. CDL License Requirements State By State. recouple. View the price and details of this FINSBURY PUMP SYSTEMS 400L (SINGLE STAGE) 5.5HP HONDA GX PETROL ENGINE (18M HOSE) FIRE WATER TANK | Mobile fire units. D 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 _______. You can also reach us at (888) 830-2326. True! A) one inch of space . 0000008166 00000 n The puzzle: At the far left edge, the plates are in contact, so the path length difference between rays 222 and 333 is zero. locked . If your tanks have automatic drains, they will keep most moisture out, but you should still open the drains to make sure. You should be sure the converter dolly air tank drain valves are _____ and the pintle hook is _____. It's a fifth wheel, not a sixth wheel. Ideal for replacing a worn, leaky drain valve on a compressor. Join 50,000+ users around America to get your Commercial Driver License today! What three methods can you use to secure a second trailer before coupling? The pressure in the service line tells how much pressure the relay valves should send to the trailer brakes. CDL Doubles and Triples Test Question and Answers 2023 [PDF]: Commercial Drivers License Doubles and Triples Endorsements Knowledge Test. Leave the emergency line shut-off valve closed and open the service line valve. A. use the engine brake or speed retarder When checking the fifth wheel, you should make sure that it has enough? Converter dollies are connected to front trailers with a? The trailer height is right when: The trailer will be raised slightly when the converter dolly is backed under it. When coupling twin trailers, you should _______ the pintle hook and secure the dolly support in the _______ position. Some large trucks have curved (convex or spot) mirrors. Therefore, look far ahead so you can slow down or change lanes gradually when necessary. 0000010306 00000 n speed and start spinning again, in turn stopping your skid, All the listed answers would be correct. What is most likely to happen if the trailer protection valve of a double or triple trailer does not function correctly? It is important to check the height of the trailer before connecting a converter dolly to a trailer. You should hear air escaping, showing the entire system is charged. New! Page 7-6 Commercial Driver's Manual/2.0 = Be sure air lines are supported and glad hands are properly connected. Open, latched B. pull gently against the pin of the second semitrailer B. the emergency line valve open and release air C. open, except the one connected to the rear trailer should be closed, During normal operation the brakes on double and triple trailers are controlled by the: You want to lock your combination to a second trailer that has no spring brakes. There are more things that can go wrong, and doubles/triples are less stable than other commercial vehicles. The trailer height is right when: The trailer will be raised slightly when the converter dolly is backed under it. doubles/triples flip flop over from quick steering movements more easily than many other vehicles. C. use stab or controlled braking, Which of these is true? Which diagram shows the best way to turn? In a certain electronic device, a three-stage amplifier is desired, whose overall voltage gain is 42 dB. When connecting a converter dolly to a rear trailer, the trailer height must be adjusted so that it is? C. engaging the tractor valve protection control, You must drive through deep or flowing water. That there is some space between the upper and lower fifth wheel. Hazardous materials must be placarded on all four sides of EACH Trailer. Secure converter gear support in raised position. d. protein. 0000003261 00000 n 0000001162 00000 n Blue is used for the service lines, and red for the emergency (supply) lines. 2. Why is there still destructive interference? The lightest trailer You should keep at least ____ seconds of space ahead of you. Doubles and triples are more likely to turn over than other combination vehicles because of what effect? 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. Hit the article to see the way to back up your trailer like a pro! 2023 PA Doubles - Triples CDL Practice Test 3 - CristCDL.com Always unlock the pintle hook with the dolly still under the rear trailer. Doubles and triples must be driven very smoothly to avoid rollover or jackknife. Their drawbars differentiate them. Go to Section 4: Other Topics This question is in Section 4: Other Topics of our CDL Test Guide. Any vehicle, regardless of size, designed to transport 16 or more persons, including the driver. A. you can steer more quickly and safely if you hold the wheel with one hand You are driving a triple trailer and there is a loss of air pressure in the emergency line. CDL Doubles & Triples Practice Test 3 - Classic Mode - Trucker Country Always test the trailer brakes before driving with the hand valve or by pulling the air supply (tractor protection valve) control. More driving knowledge, questions and answers, online practice tests for obtaining a drivers . 0000005733 00000 n Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? The trailer brakes will unlock Double and triple trailers increase not only the operators risk of safety, but also the other motorists around him. You should NOT: Open. Some do. What is likely to happen? DMV Doubles Triples Practice Test | CDL Knowledge When turning a double or triple at an intersection, the turn often cannot be completed without swinging wide. B. slow to a safe speed before entering the curve, then accelerate slightly through it Some vehicles have dead end or dummy couplers to which the hoses may be attached when they are not in use. D Remember however, that is just a suggestion. then there is a problem with the ABS system. 11 During normal operation the brakes of the double/triple trailer are controlled by: Pintle-eye of dolly in place in pintle hook of trailer (s). A. require shorter stopping distances than full ones C front of the second trailer. retrovirus $_____________________________$. You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. All other trailer air functions use the emergency line. You are driving a 100 foot twin trailer combination at 50 mph. Make sure pintle hook is latched. How can you test that air flows to all trailers? Follow the procedures described later in this section. When uncoupling doubles or triples, what is important to know about unlocking the pintle hook? Slow to the safe speed before entering, then accelerate slightly through the curve. Air will not be available to release the trailer spring brakes (parking brakes). These mirrors: Make things seem smaller and further away than they really are. Seriously! These valves permit closing the air lines off when another trailer is not being towed. The Verge logo. This will let the rear wheels roll again and keep the rear wheels from sliding. What should you check for when inspecting a converter dolly - Answers You are driving with double trailers and must use your brakes to avoid a crash. You should be sure the converter dolly air tank drain valves are _______ and the pintle hook is _____. The coupling between a rear trailer and a dolly should have a space between the upper and lower fifth wheels of? Often do not have spring brakes It is very important to keep the air supply clean. They are filled by the emergency (supply) line from the tractor. The dolly tow bar may fly up, possibly causing injury and making it very difficult to re-couple. At TruckingTruth we'll help you decide if trucking is right for you and help you get your career off to a great start. Converter dollies have spring brakes. which of these figures shows how the turn should be made, if you want to couple a second trailer to your combination vehicle, secure it by, the trailers spring brakes & wheel chocks. Clean the couplers and rubber seals before a connection is made. Dont hesitate to take advantage of our practice tests in each category specific to your needs. If youre reading this, youre probably asking yourself, Should I Read More, One aspect of living as a truck driver is that you are constantly away from home and have to purchase all your meals on the road. 0000003998 00000 n Provides a snug fit to eliminate unwanted seepage of air or water. C. closed, You can release the dolly brakes by: some large trucks have curved (convex or spot) mirrors. Make sure the converter dolly air tank drain valve is closed. fifth wheel, so trailer is raised slightly when dolly is pushed under it. These mirrors: make things seem smaller & further away then they really are. 0000003240 00000 n Hb```f``b`c``e@ (Q6_* Why should you use chocks when parking a trailer without spring brakes? cQ 220rd8bihuM#Om>G*Lz)g^\l9'A9/omf|b49U[@%jGT-QR6i. Hit the article below to see specific information about AOBRDs! 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, enclose converter dolly air tank drain valves With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. When you do this, you should hear: Ais escape from the open valve. You should hear air escaping, showing the entire system is charged. This would be very dangerous. None C. posted speed limits on curves are safe for all trucks, Empty trucks: If there is a trailer That there is no space between upper and lower fifth wheel. A. open D 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. On a triple combination, the shutoff valves at the rear off the middle trailer should be? For emergency braking you should: By clicking on "Sign Up", you agree to our Terms of Use and Privacy Policy. For emergency braking you should: Use controlled or stab braking Converter dollies: Often do not have spring brakes The crack the whip effect that troubles trucks with trailers. What is a converter dolly? HK Extended Tank Drain Assembly Kit with 10 Inch Braided Steel Hose 1/4 Inch Drain Valve and Elbow Fitting for Air Compressor 4.7 (463) $1499 FREE delivery Thu, Mar 9 on $25 of items shipped by Amazon Small Business All Tool Depot Air Compressor Drain Valve Replacement for Craftsman Petcock 072-0001, 072-0006 (1-Pack) 4.2 (20) $649 Should the shut off valves on the rear of the first trailer be open or closed on a set of double trailers? Eventually, the air will leak away, and then there will be no brakes. 0000003977 00000 n 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. you are driving a set of doubles and a set of trailer wheels goes in a skid. trailer << /Size 59 /Info 20 0 R /Root 22 0 R /Prev 29211 /ID[] >> startxref 0 %%EOF 22 0 obj << /Type /Catalog /Pages 19 0 R >> endobj 57 0 obj << /S 66 /Filter /FlateDecode /Length 58 0 R >> stream Each tank has a drain valve on it, and you should drain each tank every day. Which f these will result in the best control on curves? B. slightly open Locking jaws open 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. You can reset the test and retake it as needed. c. iron 2. If your converter dolly has to be moved over a distance to bring it to your semitrailer, you should? Also, this page requires javascript. 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. 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. Use controlled or stab braking 0000005345 00000 n The road is dry, and visibility is good. The air lines will rupture CDL Doubles and Triples Test Question and Answers Converter dolly air tank drain valve: CLOSED Air lines supported and glad hands properly connected. To check that the trailer emergency brakes are working properly, you should pull out the trailer air supply control and? You will speak with recruiters today. CDL: Doubles/Triples Flashcards | Quizlet A converter gear or dolly is a coupling device of one or two axles and a fifth wheel by which a semi-trailer can be coupled to the rear of a tractor-trailer combination forming a double bottom.
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