When entering a roundabout, a driver must yield the right-of-way to drivers already in the roundabout and obey all traffic signs. Please visit using a browser with javascript enabled. It's a fifth wheel, not a sixth wheel. 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. If loading fails, click here to try again. The final procedure when connecting a rear trailer is to? CDL Practice Tests 2023 - Doubles And Triples Which of these statements about quick steering movements and doubles/triples is true? Use only the trailer brakes They provide the air pressure used to operate trailer brakes. When uncoupling the converter dolly Why should you never unhook the Wait for air pressure to reach normal, then push in the red trailer air supply knob. 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 individual voltage gains of the first two stages are to be equal, while the gain of the third is to be one-fourth of each of the first two. 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. Doubles and triples are more likely to turn over than other combination vehicles because of the "crack-the-whip" effect. For emergency braking you should: You are doing a walk around inspection of a double or triple trailer rig. You may not notice a major leak in the service line until you try to put the brakes on. With the red knob pushed in on the tractor dash, the service line should have air in it. When uncoupling a rear trailer, you should remove some weight from the dolly by? That there is no space between upper and lower sixth wheel. 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. The road is dry and visibility is good. You should not hear air escaping. Compressed air usually has some water and some compressor oil in it. A Why should you check for when inspecting the converter dolly? 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. When you do this, you should hear: you are driving with double trailer and must use your brakes to avoid a crash. 3. Trailer Air Tanks And Shutoff Valves - TruckingTruth True False True If you want to couple a second trailer to you combiantion vehicle, secure it by using the: Trailer emergency air brakes. Some areas of concern are discussed below. Good speed management says you should: You must drive through deep or flowing water. 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. D safe speed would be 40 MPH. View More Details. 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 Stay up to date on truck driving industry news. Flashcards - Doubles Tripes Test #4 - FreezingBlue These dollies will have a yellow lamp on the left side of the dolly Questions You Should Know For Doubles And Triples 1. To check if the converter dolly is securely coupled to the rear trailer you should: Pull gently against the pin of the second trailer. How should you test the coupling? Park the rear trailer against another trailer, chock the tires and lock the trailer Question 4. What is one function of the tractor protection valve? D You are visually checking the coupling of a converter dolly to the rear trailer. You should keep at least ____ seconds of space ahead of you. When coupling twin trailers, a converter dolly is. 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 are only used on trailers designed to be towed in conjunction with other trailers (doubles / triples). This is CDL Doubles and Triples Test 3in our original Classic Mode. 10. Pull gently against them in a low gear to make sure the brakes work. B. releasing the pintle hook Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? A bent or damaged kingpin on a coupling should be? While inspecting your converter dolly coupling, you should make sure there is _______ between the upper and lower fifth wheel. C 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. All rights reserved Site Map. Types of converter dollies. All of the above, 6. Eventually, the air will leak away, and then there will be no brakes. your vehicle is so long that you must swing wide to make a turn. 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: If spare tire is carried on converter gear (dolly), make sure it's secured. Always unlock the pintle hook with the dolly still under the rear trailer. What is the most common foundation brake found on heavy vehicles? Calculate the voltage gain of each. and possible answers include: open, free or closed, latched or closed, free or open, latched from TruckersDouble & Triple Trailer (CDL) Endorsement. The converter dolly is an auxiliary axle with a coupling device. 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? The puzzle: At the far left edge, the plates are in contact, so the path length difference between rays 222 and 333 is zero. [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]. A. air escape from the open valve Open the emergency line shut-off valve at the rear of the last trailer. What do you check when making a visual check of coupling? 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: A green traffic light allows the driver to go. Should the shut off valves on the rear of the first trailer be open or closed on a set of double trailers? B A connection device of one axle used to disconnect a semitrailer combination vehicle The braking systems of double and triple trailers are different than those of straight trucks because doubles and triples. rear trailer. Use the engine brake or speed retarder. A To check that the trailer emergency brakes are working properly, you should pull out the trailer air supply control and? The road is dry and visibility is good. Usually need a glad hand converter Should the shut-off valves on the rear of the last trailer be open or closed? The driver must yield the right-of-way to other vehicles when merging and when entering a highway from an alley. 1/32 to 3/32 of an inch. Doubles and triples must be driven very smoothly to avoid rollover or jackknife. then there is a problem with the ABS system. 10 (done) Chp 23: Cash Flow + Working Capital, Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer. Blue is used for the service lines, and red for the emergency (supply) lines. PDF Section 7: Doubles and Triples - CDL Study Pintle-eye of dolly in place in pintle hook of trailer (s). B A The A-dolly has a single drawbar with a single, centered hitching point. B. keep other traffic out of your side space 0000007487 00000 n 0000008894 00000 n Safety should never take second place, so know your stuff! 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. The pressure in the service line is controlled by the brake pedal and the trailer hand brake. A. use light, steady pressure on the brake pedal Visually check to make sure that the rear trailer is slightly lower than the center of the A sudden movement with the steering wheel can result in a tipping over rear trailer. the fifth wheel, so trailer is raised slightly when dolly is pushed under it. Did you know you can fill out one quick form here on TruckingTruth and apply to several companies at once for paid CDL training? 1 4. You should NOT: what is likely to happen if the pintle hook is unlocked with the dolly still under the second trailer? Learn more and apply here: The more heavily loaded semitrailer should be in first position behind the tractor. CDL: Doubles/Triples Flashcards | Quizlet recouple. What do you check when making a visual check of coupling? A vehicle transporting hazardous materials is required to display placards where? Open The rear trailer does not have shut-off valves. Which is most likely to tip over: Slow to the safe speed before entering, then accelerate slightly through the curve. 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. It depends on the load True! You should be sure the converter dolly air tank drain . What should you check for when inspecting a converter dolly? the road is dry & visibility is good. you should avoid traveling next to others when possible. What's a converter dolly? While it is general practice to make blue the service line, red the emergency line, and green the electrical line, these colors are not required by any laws or regulations. Double and Triples Endorsement Flashcards When checking the coupling system, make sure that the locking jaws are around the shank of the. When the road is dry The rear trailer of a triple More driving knowledge, questions and answers, online practice tests for obtaining a drivers . You are driving a tractor with multiple trailers. To uncouple the rear trailer in a set of doubles, the shut-off valve at the rear of the front trailer should be: Closed. Time used (Requires timer add on). Ensuring the safety of the public starts with a thorough inspection of all equipment. You are doing a walk around inspection of a double or triple trailer rig. Then, the air loss from the leak will lower the air tank pressure quickly. retrovirus $_____________________________$. Make sure pintle hook is latched. 1/2 to 3/4 of an inch What is most likely to happen if the trailer protection valve of a double or triple trailer does not function correctly? What does the drivers manual say about how much space you should keep ahead of your truck? Speed for other vehicles is often too fast for a multi-combination unit! ), a 15 year truck driving veteran, in January 2007. All trademarks are property of their respective owners. Antilock Braking Systems on Converter Dollies, Converter dollies built on or after March 1, 1998, are required to have antilock brakes. In bad weather, slippery conditions and mountain driving, you must be especially careful if you drive double and triple bottoms. What types of trailers can get stuck on raised crossings? How do you check to make sure trailer height is correct before coupling? Open the emergency line shut-off valve at the rear of the last trailer. Locking jaws closed on should remain in the closed position. What three methods can you use to secure a second trailer before coupling? When inspecting a converter dolly What should you check for? All rights reserved 2022 TestPermit.com, CDL Doubles and Triples Test Question and Answers, Divided Highway Sign: Meaning, Quiz Definition, Example, Shape, Location, Color, Narrow Bridge Sign: Meaning, Quiz Definition, Example, Shape, Location, Color, STOP Sign 2023 Meaning, Quiz Definition, Example, Shape, Location, Color, Crossbuck Sign: Meaning, Definition, Example, Shape, Location, Color, Georgia CDL Permit Practice Test 2023 Study Guide [PDF], Georgia Motorcycle Permit Test 2023 with Study Guide [PDF], Georgia Permit Test 2023 (DDS Practice Test UPDATED), Georgia ADAP Practice Test 2023 Questions Answers Online, Ohio CDL Permit Practice Test 2023 Study Guide [PDF], Ohio Motorcycle Permit Test 2023 Study Guide [PDF]. Double and triple trailers increase not only the operators risk of safety, but also the other motorists around him. On a triple combination, the shutoff valves at the rear off the middle trailer should be? DOUBLE/TRIPLE CDL Flashcards | Chegg.com fumoto drain valve. The dolly tow bar may flip up causing bodily injury and making it very difficult to Open, free not have spring brakes. Connect the Converter Dolly to the Rear Trailer: Test the coupling by pulling against the pin of the second semitrailer. D You are visually checking the coupling of a converter dolly to the rear trailer. You will speak with recruiters today. Inspecting Doubles And Triples | High Road Online CDL Training 11 During normal operation the brakes of the double/triple trailer are controlled by: A The dolly tow bar may fly up, possibly causing injury and making it very difficult to re-couple. Which trailer should come first behind the tractor? If you crossed the air lines, you could drive away, but you would not have trailer brakes. 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. Join 50,000+ users around America to get your Commercial Driver License today! All material on this website is copyrighted. you are doing a walkaround inspection of a double or triple trailer rig. Dont hesitate to take advantage of our practice tests in each category specific to your needs. Only a certified diesel mechanic can check this. There is more chance for skids and loss of traction. A. countersteer The rear trailers shut off valves should be closed and the front open to allow air to the They provide the air pressure used to operate trailer brakes. These mirrors: 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. When coupling twin trailers, you should _______ the pintle hook and secure the dolly support in the _______ position. Double/Triple Flashcards | Quizlet Be sure air-lines are supported and glad hands are properly connected. which of these statements about managing space to the sides is true? Use controlled or stab braking 60607. You should be sure the converter dolly air tank drain valves are _____ and the pintle hook is ____. 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 you do, the brakes may not work correctly. the trailer height is right when: the trailer will be raised slightly when the converter dolly is backed under it. D. Make sure the spare tire is secured, if it has one. B. restore traction to the tires The lightest trailer Therefor, if there is a major leak in your service line, you may not know it until you try to use the service brake. 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 _____. 0000001775 00000 n There are more things that can go wrong, and doubles/triples are less stable than other commercial vehicles. Delivering to. symptoms of a bad fuel tank selector switch. Your vehicle is so long that you must swing wide to make the turn. 0000001107 00000 n You must treat a flashing red signal as you would treat a STOP sign. Also available in App Store & Google Play. Leave a Reply Cancel reply - Free CDL Practice Tests 2022 Check them all. A dolly is like a very short trailer, with a ring hitch on the front and a fifth wheel on top. In the coupling system, the locking jaws should be fixed around? They are filled by the emergency (supply) line from the tractor. 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? Feel Free to add additional fields for the Quiz Taker to complete using the "Add Fields" options to the right. 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. Tractor-trailers are considered combination vehicles. Converter dolly air tank drain valve: CLOSED Air lines supported and glad hands properly connected. Study section 6.2 if you can't answer all of these questions. Why should you not use the trailer hand valve while driving? 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 _______. 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. B These dollies will have a yellow lamp on the left side of the dolly. Make sure to visually inspect the fifth wheel and that the locking mechanism is Park on level ground, put chock on the tires, and charge the air tank. King pin. Always test the trailer brakes before driving with the hand valve or by pulling the air supply (tractor protection valve) control. B. pull gently against the pin of the second semitrailer This would be very dangerous. kingpin. You should check the height of the trailer before connecting a converter dolly to a second or third trailer. 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