the converter dolly air tank drain valve should be the converter dolly air tank drain valve should be

This will supply air to the emergency (supply) lines. C You will not be tested on uncoupling twins unless you want to get a double/triple trailer endorsement on your license. You should hear air escaping, showing the entire system is charged. 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. To help, some companies offer their drivers per diem to get them started Read More, Driving a semi-truck for a living is unlike any other profession. What is a converter dolly? Open the emergency line shut-off valve at the rear of the last trailer. 0000001582 00000 n allow "much more space than is needed for ideal driving conditions". The service air line is only used to control the service brakes (when you press on the brake pedal or use the trailer hand-valve). The converter dolly air tank drain valve on coupled double/triple trailers should be: Answer: Closed. Take this same test in our other testing modes How to Get a Hazardous Materials Endorsement, What is a CDL? When the road is slippery rear trailer. With the red knob pushed in on the tractor dash, the service line should have air in it. If this activity does not load, try refreshing your browser. If this lamp is illuminated and does not go out, Push the brake pedal as hard as you can and hold it there Should the converter dolly air-tank drain valve be open or closed on a double trailer combination? Therefor, if there is a major leak in your service line, you may not know it until you try to use the service brake. Air Storage and Drain Tanks: Air storage tanks are used to hold compressed air. You can reset the test and retake it as needed. How can you be sure you supplied air to a second trailer? When turning a double or triple at an intersection, the turn often cannot be completed without swinging wide. Any vehicle required by federal regulations to be placarded while transporting hazardous materials. re-couple, You can if you want to, it does not matter. What is likely to happen? There is a school zone ahead. If the fifth wheel on a coupling is too far forward, the tractor frame may hit? Therefore, look far ahead so you can slow down or change lanes gradually when necessary. you are driving a 100ft truck eith double trailers at 50mph. Number of wrong answers. B and possible answers include: open, free or closed, latched or closed, free or open, latched from TruckersDouble & Triple Trailer (CDL) Endorsement. You are driving with double trailers and must use your brakes to avoid a crash. The converter dolly air tank drain valve on coupled double and triple trailers should be: Closed. A. open Feel Free to add additional fields for the Quiz Taker to complete using the "Add Fields" options to the right. The couplers have a rubber seal that prevents air from escaping. 7. NPT thumbscrew style design enables easy installation. Any time you have to 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 A. release the spring brakes and check for movement The puzzle: At the far left edge, the plates are in contact, so the path length difference between rays 222 and 333 is zero. This has the same value as the %%SCORE%% Variable on the Final Screen. When driving with more than one trailer, which trailer should be the first one behind the tractor? The number and size of air tanks varies among vehicles. The dolly will have a yellow lamp on the drivers (left) side. If there is a trailer Nothing, the weight of the trailer will keep it in place, 10. A) one inch of space . We'll help you make the right choices and prepare for a great start to your trucking career. Single axle converter dollies are the most common type of converter dolly used in the U.S. C-dolly The C-dolly has two separate couplings, side-by-side. Light cords firmly in sockets on trailer. the rig will continue moving in a straight line no matter how much the steering wheel is turned. ), a 15 year truck driving veteran, in January 2007. Use the dummy couplers when the air lines are not connected to a trailer. To check that the trailer emergency brakes are working properly, you should pull out the trailer air supply control and? 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 There is no requirement or exact standard for color coding. B What does the Commercial Driver Handbook say about how much space you should keep ahead of your truck? A Which of these are the correct positions for shut-off valves in doubles and triples? 0000005664 00000 n converting it into two trailers, A coupling device of three or four axles and a fifth wheel by which a semitrailer can Why should you use chocks when parking a trailer without spring brakes? Make a sketch that explains this phenomenon in terms of a feedback loop . If you have traffic on both sides of your vehicle and something is blocking your lane, a move to the right still be best. Connect the Converter Dolly to the Rear Trailer: Test the coupling by pulling against the pin of the second semitrailer. Doubles and triples must be driven very smoothly to avoid rollover or jacknife. Join 50,000+ users around America to get your Commercial Driver License today! For all brakes to work on a triple combination, you must have air supply? 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. You have not finished your quiz. Double and triple trailers increase not only the operators risk of safety, but also the other motorists around him. Air escape from the open valve The converter dolly air tank drain valve on coupled double and triple trailers should be: When inspecting coupled doubles and triples, make sure the pintle hooks are: How can you be sure you supplied air to a second trailer? 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. on kingpin. 0000009556 00000 n Locking jaws closed on 0000007508 00000 n The road is dry and visibility is good. D When connecting two trailers the converter dolly is connected to the rear trailer first. 0000006015 00000 n Open the emergency line shut-off valve at the rear of the last trailer. C. posted speed limits on curves are safe for all trucks, Empty trucks: This has the same value as the %%PERCENTAGE%% Variable on the Final Screen. front of the second trailer. B. johnson bar None of the above, 2. Tractor-trailers are considered combination vehicles. 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! You need to brake in order to regain control. TestPermit.com provides free unofficial review materials for a variety of exams. Ensuring the safety of the public starts with a thorough Always unlock the pintle hook with the dolly still under the rear trailer. With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. "Glad hands" are coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer. Hit the article to see the way to back up your trailer like a pro! Trucks with trailers have a dangerous crack-the-whip effect. the road is dry & visibility is good. d. protein. You wish to turn right from one two-lane, two-way street to another. How do you check to make sure trailer height is correct before coupling? Pintle hook latched. Converter dolly air tank drain valve: CLOSED. The emergency line valve open and release air door. B c. iron Because of this, which of the following vehicle parts is most likely to tip over? When inspecting the air brakes on doubles and triples, you wait for air pressure to reach normal, then push in the red trailer air supply knob. Email Updates When New Articles Are Posted. Dont hesitate to take advantage of our practice tests in each category specific to your needs. A The rear trailer of a triple Air pressure is sent from the air tanks to the brakes by relay valves. Related Question Question: What does this sign mean? 0000006383 00000 n Why should you not use the trailer hand valve while driving? 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. 1. Which of the following statements about off tracking is true? Therefore, it is very important for safety that you use wheel chocks when you park trailers without spring brakes. Some do. Should the shut-off valves on the rear of the last trailer be open or closed? If there is air there, then there is air towards the cab You want to hook up to the first trailer, then the converter dolly while it is lined up in When you do this, you should hear: you are driving with double trailer and must use your brakes to avoid a crash. and the converter dolly air tank drain valve should 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. to do this without wheel chocks you should: supply air to the trailer air system with the tractor and then disconnect the emergency line. It is very important to keep the air supply clean. A vehicle transporting hazardous materials is required to display placards where? the fifth wheel, so trailer is raised slightly when dolly is pushed under it. These dollies will have a yellow lamp on the left side of the dolly Questions You Should Know For Doubles And Triples 1. Unless you are draining the condensation out of the air tank, then the drain valve The rear trailer of a double safe speed would be 40 MPH. 1/2 to 3/4 of an inch Mar 2 - Mar 3. 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. Their drawbars differentiate them. C. fully raised, Which of these statements about speed management and braking is true? What three methods can you use to secure a second trailer before coupling? More driving knowledge, questions and answers, online practice tests for obtaining a drivers . recouple. 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. A dolly should be pulled out from a rear trailer using? You can also reach us at (888) 830-2326. 2. You are driving a 100 ft twin trailer combination at 50 mph. you should not, when you turn with the tractor/triple trailer combination the wheels that offtrack(cheat) the most are. A) closed . Open the emergency line shut-off valve at the rear of the last trailer. The dolly tow bar may flip up causing bodily injury and making it very difficult to Your vehicle is so long that you must swing wide to make the turn. CDL License Requirements State By State. C Doubles/triples flip flop over from quick steering moves more easily than many vehicles. Compressed air usually has some water and some compressor oil in it. Describe what the trailer air supply control does. You should NOT: You are driving a set of doubles and a set of trailer wheels goes into a skid. You are doing a walk around inspection of a double or triple trailer rig. A. hand valve 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. Slow to the safe speed before entering, then accelerate slightly through the curve. Otherwise, the dolly tow bar may fly up, possibly causing injury and making it very difficult to re-couple. B. for doubles and triples, the fifth wheel should be all the way towards the tractor All other trailer air functions use the emergency line. A. use light, steady pressure on the brake pedal B Question 3 Explanation: All of the above. Make sure trailer height is correct. The coupling between a rear trailer and a dolly should have a space between the upper and lower fifth wheels of? The topics with which you will want to be expertly familiar are: There isnt as much information to be studied in the classroom or in the CDL manual regarding doubles and triples, so in-lot and on-the-road practice will help you pass this test. you are driving a set of doubles and a set of trailer wheels goes in a skid. Leave the emergency line shut-off valve closed and open the service line valve. Study section 6.2 if you can't answer all of these questions. . None of the above, 4. Hit the article below to see specific information about AOBRDs! You are driving with more than one trailer. That there is no space between upper and lower fifth wheel. 0000008187 00000 n slow to safe speed before entering, then accelerate slightly through the curve. Open. _______ should be tested with the hand valve but controlled in normal operation with the foot pedal. 0000002636 00000 n 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. The shut off valves, when in the open position, allows air to flow out to another trailer. Connect the Converter Dolly to the Rear Trailer: Test the coupling by pulling against the pin of the second semitrailer. You are driving with double trailers and must use your brakes to avoid a crash. B Becoming A Truck Driver is a dream we've all pondered at some point in our lives. How do you know if your converter dolly is equipped with antilock brakes? 5. Ideal for replacing a worn, leaky drain valve on a compressor. If you're pulling more than one trailer, all valves should be open except the very last trailer, which should have all valves in the closed position. All trademarks are property of their respective owners. These mirrors: When you go to the rear of the last trailer, what should you do to complete this check? The rear trailers shut-off valves should be open and the front closed. Our normal business hours are Monday-Friday 8 a.m. to 5 p.m. (Pacific Time). 1/32 to 3/32 of an inch. Which of these statements about managing space to the sides is true? B. releasing the pintle hook There is no obligation whatsoever. D 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? You will have greater length and more dead axles to pull with your drive axles than other drivers. That there is no space between upper and lower sixth wheel. behind the shut-off valve then they need to remain open. Opening the shut off valves on the rear most trailer will ensure the lines are flowing Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? Which of the following will occur? . The converter dolly air tank drain valve on coupled double and triple trailers should be: A. open B. closed C. partially opened B When inspecting coupled doubles and triples, make sure the pintle hooks are: A. secured to the safety pins B. in the open position C. latched C Which of these is true? 0000003977 00000 n 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. 3. during normal operation the brakes of the double/triple trailer are controlled by : which of these will result in the best control on curves? You are driving a tractor with multiple trailers. For emergency braking you should: A Push the brake pedal as hard as you can and hold it there B There are more things that can go wrong, and doubles/triples are less stable than other commercial vehicles. C These valves permit closing the air lines off when another trailer is not being towed. Only trailers designed to be pulled with another trailer behind it will have a shut off valve. If spare tire is on converter gear (dolly), make sure it is secured. You are visually checking the coupling of a converter dolly to the rear trailer. Locking jaws open 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. Also, this page requires javascript. 0000008915 00000 n You will speak with recruiters today. For emergency braking you should: 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. The weight of the individual trailers will have no noticeable effect on the handling of the vehicle, The weight of all trailers should be nearly the same, within 2% of each other. Explain why the waves that reflect from the far left edge of the plates in the given figure earlier exhibit destructive interference (zero intensity) at x=0x=0x=0. Please visit using a browser with javascript enabled. 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. Before you can supply air to the air tanks of a second trailer you need to: Open the shut-off valves at the rear of the first trailer and close the shut-off valves at the rear of second trailer. When connecting the glad hands, press the two seals together with the couplers at a 90-degree angle to each other. A major leak in the emergency line will cause the tractor protection valve to close and the trailer emergency brakes to come on. D All material on this website is copyrighted. Before you can supply air to the air tanks of a second trailer you need to. If a converter dolly is still under the second trailer and you unlock the pintle hook, what will probably happen? HlTo xGf`{iIMh-x||?pbE':X4ZZZRbu7 uvi_RHUkVXBVu{^B3 4e/iw\]RE] YY7i)e V*h(++WQ-]Xm9c5yU6BS" 5HiL,[b)ee:t/ )%BVGpU7T\ZJD The trailer height is right when: The trailer will be raised slightly when the converter dolly is backed under it. C. 3, You are doing a walk around inspection of a double or triple trailer rig. Once you have coupled your rear trailer, you should test the coupling by? Should the shut-off valves on the trailers be open or closed on a set of double trailers? Hb```f``b`c``e@ (Q6_* The final procedure when connecting a rear trailer is to? Disconnect the glad-hand at the front of the first trailer and listen for air flow. 1/3 For example: If you are traveling 60 MPH and it begins to rain, your suggested However there are some states that allow doubles that are each 48 feet in length. You should not hear air escaping. You should keep at least ____ seconds of space ahead of you. When driving a truck with more than one trailer, which trailer should be first behind the truck?