All of the above, 6. Join 50,000+ users around America to get your Commercial Driver License today! When pulling a single trailer with a Shut-Off Valve, the valves must be in the: Trailers built before what year may not be equipped with trailer spring brakes? 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: A Explore now! How much space should be between the upper and lower fifth wheel? Make sure the converter dolly air tank drain valve is closed. If loading fails, click here to try again. What's a converter dolly? you want to hook your combination to a second trailer that has no spring brakes. While inspecting your converter dolly coupling, you should make sure there is _______ between the upper and lower fifth wheel. What do you check when making a visual check of coupling? Flammable materials in the front trailer then it must have the placards on that trailer. B Which is most likely to tip over: Hb```f``b`c``e@ (Q6_* Pickup at South Loop. If you leave this page, your progress will be lost. B. keep gentle pressure on the brakes while going through the water and for a short distance after coming out You must steer gently when pulling trailers. Locking jaws open Slow to the safe speed before entering, then accelerate slightly through the curve. 0000002636 00000 n A. hand valve C. foot pedal, Which of these statements about managing space to the sides is true? What is a converter dolly? You may be timed. 10. 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. Double/Triple Flashcards | Quizlet When you uncouple twin trailers, the last step is to Converter dollies You want to hook your combination to a second trailer that has no spring brakes. A. closed; latched On the first trailer in a set of doubles? The dolly tow bar may fly up, possibly causing injury and making it very difficult to re-couple. 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: Visually check to make sure that the rear trailer is slightly lower than the center of the 0000005664 00000 n When you go to the rear of the last trailer, what should you do to complete this check? Some vehicles have dead end or dummy couplers to which the hoses may be attached when they are not in use. 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. Closed, free, 8. symptoms of a bad fuel tank selector switch. When coupling twin trailers, a converter dolly is. If your tractor protection valve doesn't work properly, then if an air hose starts to leak what could happen? A converter dolly is still under the second trailer when you unlock the pintle hook. fumoto drain valve. Do converter dollies have spring brakes? Newer trailers have spring brakes just like trucks and truck tractors. When you do this, you should hear: Eventually, the air will leak away, and then there will be no brakes. 1. This will supply air to the emergency (supply) lines. Time used (Requires timer add on). B Double and triple trailers increase not only the operators risk of safety, but also the other motorists around him. Flashcards - Doubles Tripes Test #4 - FreezingBlue 0000001375 00000 n The shut off valves, when in the open position, allows air to flow out to another trailer. D C You need to stop braking because it's necessary for you to speed up, When you are in a drive-wheel braking skid, the first thing to do is STOP BRAKING! 5. C. closed, You can release the dolly brakes by: 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 If there is a trailer If you are only pulling one trailer, make certain the valve is fully in the closed position or it will leak air out of the air system. You should keep at least ____ seconds of space ahead of you. When uncoupling the converter dolly Why should you never unhook the There are more things that can go wrong, and doubles/triples are less stable than other commercial vehicles. When you are pulling trailers, which of the following statements is true about steering? open, closed, closed: Term. when driving a truck with more than one trailer, which trailer should be first behind the truck? Calculate the Mach number at section 2. Because of this, which of the following vehicle parts is most likely to tip over? Then, the air loss from the leak will lower the air tank pressure quickly. weather passes. Open the emergency line shut-off valve at the rear of the last trailer. 3. Sketch the shape of the passage between sections 1 and 2. A. make things look smaller and farther away than they really are View More Details. . - Converter dolly air tank drain valve: CLOSED. You are driving with double trailers and must use your brakes to avoid a crash. View the full article to see how to set cruise control correctly! your vehicle is so long that you must swing wide to make a turn. A. release the spring brakes and check for movement The trailer brakes will unlock 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. Make sure you can hear air escaping with the valve closed. Ideal for replacing a worn, leaky drain valve on a compressor. B. open; latched Any single vehicle with a GVWR of 26,001 or more pounds, or any such vehicle towing another not in excess of 10,000 pounds. when does the drivers manual say you should disable the steering axle brakes? Air pressure is sent from the air tanks to the brakes by relay valves. D A. use the engine brake or speed retarder [Flashing Signals, Traffic Signals, Chapter 5 - Signals, Signs and Pavement Markings, North Carolina Driver's Handbook], One component of the DUI sentence in the state of Tennessee is twenty-four hours of litter pick-up wearing clothing that says "I am a drunk driver." They provide the air pressure used to operate trailer brakes. 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 _____. on kingpin. The trailer height is right when: The trailer will be raised slightly when the converter dolly is backed under it. B. for doubles and triples, the fifth wheel should be all the way towards the tractor C PDF Doubles and triples 1. The stopping distance for a tractor trailer A. The dolly will have a yellow lamp on the drivers (left) side. All rights reserved Site Map. High Road 2.0! 0000004668 00000 n coupled to the rear of a tractor-trailer combination forming a double bottom rig, Careful of the wording! Safety chains should be secured to trailer(s). You can reset the test and retake it as needed. behind the shut-off valve then they need to remain open. When the road is dry 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. Shut-off valves (at rear of trailers, in service and emergency lines): When pulling doubles or triples, what is important to know about the order of the trailers? You are doing a walk around inspection of a double or triple trailer rig. 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. You should keep at least _____ seconds of space ahead of you. 2 When you do this, you should hear: Ais escape from the open valve. 9 Questions You Must Ask, Decide if Truck Driving is The Correct Career Path, Do Not Sell or Share My Personal Information. Open, free Seriously! Slow to a safe speed before entering the curve, then coast through the curve. You should hear air escaping, showing the entire system is charged. You are doing a walk around inspection of a double or triple trailer rig. PDF Section 7: Doubles and Triples - CDL Study Please wait while the activity loads. The heaviest trailer 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. 0000009577 00000 n You wish to turn right from one two-lane, two-way street to another. 2003-2023 Chegg Inc. All rights reserved. B. are the easiest to stop since there is no shifting cargo Which of these are the correct positions for shut-off valves in doubles and triples? More driving knowledge, questions and answers, online practice tests for obtaining a drivers . to do this without wheel chocks you should: supply air to the trailer air system with the tractor and then disconnect the emergency line. A dolly should be pulled out from a rear trailer using? A. always keep your vehicle to the right side of your lane B. allow one vehicle length for every 10,000 lbs of gross vehicle weight B This section explains how important it is to be careful when driving with more than one trailer, how to couple and uncouple correctly, and about inspecting doubles and triples carefully. We wish you the best of luck in your endeavors and are pleased to be of assistance. When driving a double or triple trailer, greater care must be given to. "Glad hands" are coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer. For emergency braking you should: You are doing a walk around inspection of a double or triple trailer rig. If your converter dolly has to be moved over a distance to bring it to your semitrailer, you should? Doubles and triples must be driven very smoothly to avoid rollover or jackknife. 4. The puzzle: At the far left edge, the plates are in contact, so the path length difference between rays 222 and 333 is zero. safe speed would be 40 MPH. The rear trailers shut off valves should be closed and the front open to allow air to the D 0000009556 00000 n D When inspecting doubles and triples you must make sure there is air all the way to the back of the last trailer, otherwise what may not work? Should the shut off valves on the rear of the first trailer be open or closed on a set of double trailers? B These valves permit closing the air lines off when another trailer is not being towed. That there is some space between the upper and lower fifth wheel. Always test the trailer brakes before driving with the hand valve or by pulling the air supply (tractor protection valve) control. a. blood Make sure to visually inspect the fifth wheel and that the locking mechanism is 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. Doubles and triples are more likely to turn over than other combination vehicles because of the "crack-the-whip" effect. True False True If you want to couple a second trailer to you combiantion vehicle, secure it by using the: Trailer emergency air brakes. In the coupling system, the locking jaws should be fixed around? The rear trailer of a triple good speed management says you should, may have poor traction due to bouncing and wheel lock up. What types of trailers can get stuck on raised crossings? If there are no dummy couplers, the glad hands can sometimes be locked together (depending on the couplings). When only pulling one trailer, be sure the shut-off valves are all in the fully closed position. Take this same test in our other testing modes How to Get a Hazardous Materials Endorsement, What is a CDL? For all brakes to work on a triple combination, you must have air supply? Each trailer and converter dolly has one or more air tanks. Locking jaws closed on For emergency braking you should: which of these statements about emergency steering is true? We are an independent company focused on providing valuable motor vehicle and permit practice test information. The Home Depot Logo What should you check for when inspecting a converter dolly? fifth wheel, so trailer is raised slightly when dolly is pushed under it. The converter dolly air tank drain valve on coupled double/triple trailers should be: Closed. 11 During normal operation the brakes of the double/triple trailer are controlled by: How can you test that air flows to all trailers? %PDF-1.2 % 1/4 in. 0000005733 00000 n Air Storage and Drain Tanks: Air storage tanks are used to hold compressed air. To help avoid mistakes, colors are sometimes used. you should avoid traveling next to others when possible. Often do not have spring brakes Connect Converter Dolly to Rear Trailer Make sure trailer brakes are locked and/or wheels chocked. Go to the rear of the rig. Be more careful in adverse conditions. What should you check for when inspecting the converter dolly? the crack-whip effect that triubkes trucks with trailers is most likely to cause a tip over when. the fifth wheel, so trailer is raised slightly when dolly is pushed under it. Free CDL - Doubles and Triples Flashcards | Quizlet P0420 code honda odyssey 2011 - pjigzp.wikifit.it The lighter trailer should be in the rear. [Penalties Applying to Any DUI Conviction; Driving Under the Influence of Drugs or Alcohol (The "DUI" Law); Section B-7 Alcohol, Other Drugs and Driving; Tennessee Comprehensive Driver License Manual]. C Time allowed (Requires timer add on). should remain in the closed position. A. for coupled doubles and triples, be sure that the pintle hook is in the open position With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. Why is there still destructive interference? C The lighter semitrailer should be in first position behind the tractor. The dolly tow bar may fly up, possibly causing injury, and making it very difficult to 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. 0000003060 00000 n The braking systems of double and triple trailers are different than those of straight trucks because doubles and triples. A. open If you have traffic on both sides of your vehicle and something is blocking your lane, a move to the right still be best. 0000006015 00000 n 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. Refers to pulling two trailers at the same time, otherwise known as "pups" or "pup trailers" because they're only about 28 feet long. The converter dolly is an auxiliary axle with a coupling device.
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