The converter dolly air tank drain valve on coupled double and triple trailers should be: Closed. We wish you the best of luck in your endeavors and are pleased to be of assistance. They provide the air pressure used to operate trailer brakes. They are filled by the emergency (supply) line from the tractor. Hit the article to see the way to back up your trailer like a pro! A A. brake and downshift in a curve rear brakes will not work properly. Hook dolly to front trailer. Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? 0000002446 00000 n Antilock Braking Systems on Converter Dollies, Converter dollies built on or after March 1, 1998, are required to have antilock brakes. In an application in which vGS=vDS=Vsupply=1.8V,v_{G S}=v_{D S}=V_{\text { supply }}=1.8 \mathrm{V},vGS=vDS=Vsupply=1.8V, a drain current of 2 mA is required of a device of minimum length of 0.18m.0.18 \mu \mathrm{m}.0.18m. A 360 degree area of awareness is You are driving a 100 foot twin trailer combination at 50 mph. you are driving a set of doubles and a set of trailer wheels goes in a skid. What should you check for when inspecting the converter dolly and the pintle hook? All other trailer air functions use the emergency line. B. you should avoid traveling next to others whenever possible When coupling twin trailers, a converter dolly is. Trailer Air Tanks And Shutoff Valves - Page 50. Any vehicle required by federal regulations to be placarded while transporting hazardous materials. The road is dry and visibility is good. Compressed air usually has some water and some compressor oil in it. If the air supply in the trailer air tank has leaked away, there will be no emergency brakes, and the trailer wheels will turn freely. Describe what the trailer air supply control does. Should the shut-off valves on the trailers be open or closed on a set of double trailers? B. pull gently against the pin of the second semitrailer [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]. 0000007032 00000 n You must stop, yield to traffic and pedestrians, and only proceed when safe. Closed, free, 8. You are driving with more than one trailer. Hit the article below to see specific information about AOBRDs! 0000006195 00000 n How do you check to make sure trailer height is correct before coupling? Doubles and triples must be driven very smoothly to avoid rollover or jackknife. The last trailer in a combination is most likely to turn over. 3. The lightest trailer You should be sure the converter dolly air tank drain . The road is dry and visibility is good. Pickup at South Loop. kingpin. Safety chains secured to trailer (s). At TruckingTruth we'll help you decide if trucking is right for you and help you get your career off to a great start. 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. For emergency braking you should: which of these statements about emergency steering is true? If the converter dolly is close to your semitrailer, you should wheel it into position? Which of these is the correct answer? B. slightly open [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." You MUST have air all the way to the back for all the brakes to work. HlTo xGf`{iIMh-x||?pbE':X4ZZZRbu7 uvi_RHUkVXBVu{^B3 4e/iw\]RE] YY7i)e V*h(++WQ-]Xm9c5yU6BS" 5HiL,[b)ee:t/ )%BVGpU7T\ZJD some large trucks have curved (convex or spot) mirrors. Open the shut-off valves at the rear of the last trailer and listen for air flow. Do converter dollies have spring brakes? Always test the trailer brakes before driving with the hand valve or by pulling the air supply (tractor protection valve) control. Email Updates When New Articles Are Posted. Make a sketch that explains this phenomenon in terms of a feedback loop . These trailers have no parking brake. If there is When uncoupling, you should never unlock the _______ with the dolly still under the rear trailer. High Road 2.0! Charge the system and pump the brakes with the window down. Terms in this set (43) Converter dollies are used to connect: A tractor-trailer combination to another trailer. Simply click in your answer to each CDL practice test question. 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: You can find it here: High Road 2.0. B. restore traction to the tires You should keep at least ____ seconds of space ahead of you. Please visit using a browser with javascript enabled. Each trailer and converter dolly has one or more air tanks. Delivering to. B. closed Time limit varies by state. A. for coupled doubles and triples, be sure that the pintle hook is in the open position what is likely to happen if the pintle hook is unlocked with the dolly still under the second trailer? You should reduce your speed by about _____ on a wet road. The trailer height is right when: The trailer will be raised slightly when the converter dolly is backed under it. The rear trailers shut-off valves should be closed and the front open. What do you check when making a visual check of coupling? A Be sure air-lines are supported and glad hands are properly connected. When driving with more than one trailer, which trailer should be the first one behind the tractor? How do you know if your converter dolly is equipped with antilock brakes? Air Storage and Drain Tanks: Air storage tanks are used to hold compressed air. Open. Each trailer and converter dolly has one or more air tanks. Be certain you are clear at the sides before changing lanes. Take this same test in our other testing modes How to Get a Hazardous Materials Endorsement, What is a CDL? B. johnson bar When you're trying to correct a drive-wheel braking skid why should you stop braking? 0000003261 00000 n 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 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. 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 What will happen if there is a major leak in the service air line? Newer trailers have spring brakes just like trucks and truck tractors. Doubles and triples take up more space than other commercial vehicles. Locking jaws closed on You are driving a 100-feet truck with double trailers at 50 mph. C. add "one car length for every 10 mph", Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer, Incidental Motions & Motions that Bring a Que. Slow to the safe speed before entering, then accelerate slightly through the curve. The driver will be required to complete this requirement in three eight hour shifts. Converter dollies have spring brakes. with the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the trailer. 2. 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. B. do not need to be checked as often as flat mirrors because they show a larger area This has the same value as the %%TIME_USED%% Variable on the Final Screen. You should be sure the converter dolly air tank drain valves are _____ and the pintle hook is ____. not have spring brakes. NPT thumbscrew style design enables easy installation. Should the converter dolly air-tank drain valve be open or closed on a double trailer combination? C It depends on the load There is a school zone ahead. Converter dolly air tank drain valve: CLOSED. Doubles and triples must be driven very smoothly to avoid rollover or jacknife. We've all wondered if the adventure and challenges of life on the open road would suit us better than the ordinary day to day lives we've always known. If the dolly is a two axle unit then 1 Then, the air loss from the leak will lower the air tank pressure quickly. In order to receive your Doubles and Triples endorsement, it is required that you pass the states official CDL written Knowledge exam. You may not notice a major leak in the service line until you try to put the brakes on. A dolly is like a very short trailer, with a ring hitch on the front and a fifth wheel on top. D B. for doubles and triples, the fifth wheel should be all the way towards the tractor 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). Which the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the trailer. How should you test the coupling? You should be sure the converter dolly air tank drain valves are _______ & the pintle hook is __________. 0000006383 00000 n 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. When checking the fifth wheel, you should make sure that it has enough? You should hear air escaping, showing the entire system is charged. These mirrors: Make things seem smaller and further away than they really are. The Verge logo. 7.3 Inspecting Doubles and Triples = Additional Things to Check During a Walkaround Inspection. C when testing the coupling of a double trailer the landing gears of the rear trailer should be, you must drive through deep or flowing water . Related Question Question: What does this sign mean? TestPermit.com provides free unofficial review materials for a variety of exams. B Open, latched Remember however, that is just a suggestion. Why is there still destructive interference? You open the emergency line shut-off valve at the rear of the last trailer and hear air escaping. These mirrors: ADVERTISEMENT ADVERTISEMENT Therefore, look far ahead so you can slow down or change lanes gradually when necessary. Your tractor protection valve control should pop out, or go from normal to emergency position, when air pressure falls into what range? The word part ferrit- means: Once that's complete, then its an easy push back and the You should check the height of the trailer before connecting a converter dolly to a second or third trailer. That there is some space between the upper and lower fifth wheel. 0000003240 00000 n The road is dry and the visibility is good. 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? It is important to check the height of the trailer before connecting a converter dolly to a trailer. 0000008166 00000 n Provides a snug fit to eliminate unwanted seepage of air or water. A. allow "much more space" than is needed for ideal driving conditions 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. The pressure in the service line tells how much pressure the relay valves should send to the trailer brakes. %PDF-1.2 % 10 Open the emergency line shut-off valve at the rear of the last trailer. Which of these statements about managing space to the sides is true? when does the drivers manual say you should disable the steering axle brakes? What do you check when making a visual check of coupling? 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. your vehicle is so long that you must swing wide to make a turn. When you are pulling trailers, which of the following statements is true about steering? What is likely to happen? Use controlled or stab braking 1 Check them all. C you are driving at night and you must dim your headlights for traffic. When driving a truck with more than one trailer, which trailer should be first behind the truck? 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. Tips for Backing Up a Trailer Like a Pro Trucker. you want to hook your combination to a second trailer that has no spring brakes. What three methods can you use to secure a second trailer before coupling? What is a converter dolly? C 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. 3. 1/3 For example: If you are traveling 60 MPH and it begins to rain, your suggested 0000001582 00000 n How can you be sure you supplied air to a second trailer? 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 We are an independent company focused on providing valuable motor vehicle and permit practice test information. Which of these statements about quick steering movements and doubles/triples is true? to re-capture it. None of the above, 4. Take special care when pulling two and three trailers. Only a certified diesel mechanic can check this. Leave the emergency line shut-off valve closed and open the service line valve. 5. you should avoid traveling next to others when possible. A 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. Before coupling a trailer, you should make sure it is at the right height using? B 11 A When coupling twin trailers, you should _______ the pintle hook and secure the dolly support in the _______ position. If your tanks have automatic drains, they will keep most moisture out, but you should still open the drains to make sure. For emergency braking you should: A Push the brake pedal as hard as you can and hold it there B Push the brake pedal as hard as you can and hold it there You are doing a walk around inspection of a double or triple trailer rig. which of these statements about quick steering movements and doubles/triples is true? Visually check to make sure that the lead trailer is slightly higher than the center of 10. B For emergency braking you should: Which of these statements about the handling of doubles and triples is true? They are not only longer, but also need more space because they cannot be turned or stopped suddenly. how can you be sure you supplied air to a second trailer? 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. Do converter dollies have spring brakes? You are doing a walkaround inspection of a double or triple trailer rig. A Open, latched B Open, free C Closed, latched D Closed, free 28. This has the same value as the %%TOTAL%% Variable on the Final Screen. A. require shorter stopping distances than full ones The application only takes one minute. Which trailer should come first behind the tractor? Please wait while the activity loads. How much space should be between the upper and lower fifth wheel? There are two types of converter dollies. The Doubles and Triples written CDL Exam is required for your doubles and triples endorsement. When driving a double or triple trailer, greater care must be given to. When connecting two trailers the converter dolly is connected to the rear trailer first. TestPermit.com is not affiliated, endorsed, or sponsored by state agencies or any motor vehicle and any other departments in the United States, Canada, UK. However, converter dollies and trailers built before 1975 are not required to have spring brakes. B Have little braking power because they are small B. you need about four times as much stopping distance at 40 mph as at 20 mph You can reset the test and retake it as needed. You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. If the fifth wheel on a coupling is too far forward, the tractor frame may hit? 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. The heaviest trailer Try our free CDL Doubles and Triples Test Question and Answers Quiz online. A. make things look smaller and farther away than they really are Converter dollies are connected to front trailers with a? D Pintle-eye of dolly in place in pintle hook of trailer (s). The front trailer in a set of double trailers is most likely to turn over due to the Crack-the-Whip effect. Locking jaws closed on can and will get stuck on a raised railroad crossing. When connecting a converter dolly to a rear trailer, the trailer height must be adjusted so that it is? Good speed management says you should: You must drive through deep or flowing water. the trailer will be raised slightly when the converter dolly is backed under it the best way to keep brakes from getting too hot while going down long grades is to : go slow and use only light, steady pressure on the brakes you are driving a 100ft truck with double trailers at 30mph. Also, this page requires javascript. It is extremely unlikely you will drive a trailer built before 1975, but for the written exam, you still may need to know that trailers built before 1975 were not required to have spring brakes. You shouldn't stop braking. This is CDL Doubles and Triples Test 3in our original Classic Mode. 21 0 obj << /Linearized 1 /O 23 /H [ 1162 213 ] /L 29759 /E 11109 /N 7 /T 29221 >> endobj xref 21 38 0000000016 00000 n C It is very important to keep the air supply clean. Correct answer percentage. C. 3, You are doing a walk around inspection of a double or triple trailer rig. A. To prevent trailers from rolling over, you must steer gently and go slowly around corners, on ramps, off ramps and curves. B. releasing the pintle hook You wish to turn right from one two-lane, two-way street to another. You want to lock your combination to a second trailer that has no spring brakes. 6. D The lighter semitrailer should be in first position behind the tractor. When coupling, be sure to couple the proper glad hands together. Locking jaws closed on If loading fails, click here to try again. Connect the Converter Dolly to the Rear Trailer: Test the coupling by pulling against the pin of the second semitrailer. A. use light, steady pressure on the brake pedal 3. A. closed; latched 0000010306 00000 n Should I Be A Truck Driver? locked . 0000001775 00000 n In double and triple trailers, the trailer air supply control should pop or _________ when air pressure drops into the range of 20 to 45 psi. For emergency braking you should: You are doing a walk around inspection of a double or triple trailer rig. To uncouple the rear trailer in a set of doubles, the shut-off valve at the rear of the front trailer should be: Closed. B 9. Allow more following distance. Optional: Leave your email address if you would like a reply: When inspecting doubles or triples, in what position should the air shut-off valves be in? On a triple combination, the shutoff valves on the rear of the last trailer should be? 27. Which of these is NOT a good thing to do when driving on slippery roads? Make sure you can hear air escaping with the valve closed. What is a converter dolly? Why should you use chocks when parking a trailer without spring brakes? 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. To do this without wheels chocks you should: Supply air to the trailer air system with the tractor and then disconnect the emergency line. dress gifs. For all brakes to work on a triple combination, you must have air supply? 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. B The service brakes slowly move to the fully applied position True! A. you can steer more quickly and safely if you hold the wheel with one hand Opening the shut off valves on the rear most trailer will ensure the lines are flowing open, closed, closed: Term. This means. This will supply air to the emergency (supply) lines. Connect Converter Dolly to Front Trailer Back first semitrailer into position in front of dolly tongue. A. air escape from the open valve 0000002636 00000 n air throughout the system. You can test that air is flowing to all trailers by opening? Contributor: Luke Nold (Experienced truck driver for 5+ years and published writer for Fleet Magazine). There are more critical parts to check when you have two or three trailers. You are doing a walk around inspection of a double or triple trailer rig. 4. In order to supply air to the air tanks of a second trailer, you must ______ shut-off valves at the rear of the first trailer and ________ the shut-off valves at the rear of the second trailer. 0000001354 00000 n There is more chance for skids and loss of traction. There is no obligation whatsoever. You must steer gently when pulling trailers. Safety chains should be secured to trailer(s). When you turn with the tractor/triple trailer combination the wheels that off-track (cheat) the most are: You should check trailer height before connecting a converter dolly to a second or third trailer. 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. second trailer will be connected, The dolly will have a yellow lamp on the left side, The dolly will have a yellow lamp on the right side, The dolly will have a red lamp on the left side, The dolly will have a red lamp on the right side. Blue is used for the service lines, and red for the emergency (supply) lines. Otherwise, the dolly tow bar may fly up, possibly causing injury and making it very difficult to re-couple. you are driving a 100ft truck eith double trailers at 50mph. They provide the air pressure used to operate trailer brakes. Doubles/triples flip flop over from quick steering moves more easily than many vehicles. D If spare tire is carried on converter gear (dolly), make sure it's secured. A 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. kingpin, That there is grease between upper and lower fifth wheel. Pull gently against them in a low gear to make sure the brakes work. Time allowed (Requires timer add on). Open, free If not, there is a problem. Studying and applying oneself is the only way to successfully learn the information you need to know to pass all testing required to obtain your CDL. B Which of the following must be connected when coupling tractor to trailer or trailer to trailer? Stay up to date on truck driving industry news. Shut off valves are only used on trailers designed to be towed in conjunction with other trailers (doubles / triples). 0000001375 00000 n 0000010783 00000 n When you do this, you should hear: you are driving with double trailer and must use your brakes to avoid a crash. Before you can supply air to the air tanks of a second trailer you need to. The trailer height is right when: The trailer will be raised slightly when the converter dolly is backed under it. A. opening the air tank petcock C. When coupling doubles and triples, be sure that the pintle-eye of the dolly is in place in the pintle hook of the trailer, You are driving on a slippery road during the day. Either the front or the rear brakes will not work properly or fully. C. drive through quickly, With the hand valve on, you should test the trailer brakes by opening the service valve line at the rear of the rig. In normal operation, trailer service brakes should be operated by? When you do this, you should hear: Which of these statements about emergency steering is true? That there is no space between upper and lower sixth wheel. A What is the most common foundation brake found on heavy vehicles? When turning a double or triple at an intersection, the turn often cannot be completed without swinging wide. Question 3 Explanation: All of the above. 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. The converter dolly air tank drain valve on coupled double/triple trailers should be: Closed. B. the emergency line valve open and release air A. completely open A. use the engine brake or speed retarder What is most likely to happen if the trailer protection valve of a double or triple trailer does not function correctly? Which of these are the correct positions for shut-off valves in doubles and triples? Sometimes, metal tags are attached to the lines with the words service and emergency stamped on them. Use only the trailer brakes Park on level ground, put chock on the tires, and charge the air tank.