kingpin, That there is grease between upper and lower fifth wheel. Converter dolly air tank drain valve: CLOSED. Any time you have to They are filled by the emergency (supply) line from the tractor. All of the above, 6. What is one function of the tractor protection valve? Park on level ground, put chock on the tires, and charge the air tank. B. keep gentle pressure on the brakes while going through the water and for a short distance after coming out A major leak in the emergency line will cause the tractor protection valve to close and the trailer emergency brakes to come on. C 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. When driving with more than one trailer, which trailer should be the first one behind the tractor? A. allow "much more space" than is needed for ideal driving conditions View More Details. The road is dry and visibility is good. 60607. A. always keep your vehicle to the right side of your lane A. hand valve 5. 0000003060 00000 n You will speak with recruiters today. 2023 PA Doubles - Triples CDL Practice Test 3 - CristCDL.com Wait for air pressure to reach normal, then push in the red trailer air supply knob. 0000005345 00000 n You are visually checking the coupling of a converter dolly to the rear trailer. air throughout the system. B PDF Section 7: Doubles and Triples - CDL Study A vehicle transporting hazardous materials is required to display placards where? 0000003240 00000 n You wish to turn right from one two-lane, two-way street to another. D Doubles and triples are more likely to turn over than other combination vehicles because of the "crack- the-whip" effect. 2022 DE Doubles - Triples CDL Quick Review 1 - CristCDL.com 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. 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 go to the rear of the last trailer, what should you do to complete this check? 9 Questions You Must Ask, Decide if Truck Driving is The Correct Career Path, Do Not Sell or Share My Personal Information. When turning a double or triple at an intersection, the turn often cannot be completed without swinging wide. These valves permit closing the air lines off when another trailer is not being towed. the trailer height is right when: the trailer will be raised slightly when the converter dolly is backed under it. you should avoid traveling next to others when possible. The lightest trailer What should you check for when inspecting the converter dolly? 0000010705 00000 n The converter dolly air tank drain valve on coupled double and triple trailers should be: Closed. B For emergency braking you should: The lighter semitrailer should be in first position behind the tractor. Be certain you are clear at the sides before changing lanes. Each trailer and converter dolly has one or more air tanks. 0000001162 00000 n 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. 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 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 The dolly tow bar may fly up Slow to the safe speed before entering, then accelerate slightly through the curve. The Doubles and Triples written CDL Exam is required for your doubles and triples endorsement. 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: You should keep at least ____ seconds of space ahead of you. 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? Which of these is most likely too occur? What is likely to happen? Select the answer that correctly completes each statement. B. are the easiest to stop since there is no shifting cargo fumoto drain valve. Submit your email at the end of the test. None of the above, 5. All other trailer air functions use the emergency line. 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 are driving with double trailers and must use your brakes to avoid a crash. More driving knowledge, questions and answers, online practice tests for obtaining a drivers . Allow much more space than is needed for ideal driving condition. The pintle hook should always be secure when the vehicle is in motion. None The rear trailers shut-off valves should be closed and the front open. 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? The A-dolly has a single drawbar with a single, centered hitching point. The converter dolly air tank drain valve on coupled double/triple a. blood For all brakes to work on a triple combination, you must have air supply? 7.3 Inspecting Doubles and Triples = Additional Things to Check During a Walkaround Inspection. If one air system is very low on pressure _______. Open, free 3. When entering a roundabout, a driver must yield the right-of-way to drivers already in the roundabout and obey all traffic signs. The emergency line valve open and release air Study section 6.2 if you can't answer all of these questions. When uncoupling, you should never unlock the _______ with the dolly still under the rear trailer. This would be very dangerous. and the converter dolly air tank drain valve should be _____. C. engaging the tractor valve protection control, You must drive through deep or flowing water. These trailers have no parking brake. You should keep at least ____ seconds of space ahead of you. D c. iron Refers to pulling two trailers at the same time, otherwise known as "pups" or "pup trailers" because they're only about 28 feet long. rear brakes will not work properly. Doubles and triples take up more space than other commercial vehicles. 8. 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? 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. A dolly should be pulled out from a rear trailer using? What three methods can you use to secure a second trailer before coupling? If the dolly is a two axle unit then 1 weather passes. The Home Depot Logo 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. This has the same value as the %%PERCENTAGE%% Variable on the Final Screen. Florida CDL Handbook | FL CDL Handbook Coupling & Uncoupling for Related Question Question: What does this sign mean? door. Which the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the trailer. How do you check to make sure trailer height is correct before coupling? You are driving with more than one trailer. Chock the tires, park on level ground and charge the trailer air tank if it does None of the above, 2. True! S-cam brakes are the most common style brakes on large trucks today. If the converter dolly is close to your semitrailer, you should wheel it into position? Provides a snug fit to eliminate unwanted seepage of air or water. B 0000001107 00000 n For emergency braking you should: A Push the brake pedal as hard as you can and hold it there B These valves permit closing the air lines off when another trailer is not being towed. When does the "driver's manual" advise disconnecting the steering axle brakes to help Make sure you have large enough gaps before entering or crossing traffic. This has the same value as the %%TIME_ALLOWED%% Variable on the Final Screen. When checking the coupling system, make sure that the locking jaws are around the shank of the. DMV Doubles Triples Practice Test | CDL Knowledge 1 Remember however, that is just a suggestion. You can also reach us at (888) 830-2326. What three methods can you use to secure a second trailer before coupling? Stop the vehicle by gearing down and sparingly With the red knob pushed in on the tractor dash, the service line should have air in it. The converter dolly air tank drain valve on coupled double/triple trailers should be: Closed. Doubles and triples must be driven very smoothly to avoid rollover or jackknife. A truckers workspace is a small moving office Read More. But the brakes will hold only as long as there is air pressure in the trailer air tank. Never unlock the pintle hook with the dolly still under the rear trailer. When you do this, you should hear: you are driving with double trailer and must use your brakes to avoid a crash. All material on this website is copyrighted. unsafe slow down even further, or better yet, find a safe haven and park until the 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 Doubles & Triples Practice Test 3 - Classic Mode - Trucker Country Nothing will happen, but an in-cab warning indicator will let you know about the problem, It will cause the tractor protection valve to close and the trailer emergency brakes to come on, It will cause the tractor protection valve to open and the trailer emergency brakes to come on, When you try to put the service brakes on, air will quickly leak and will lower the air tank pressure, possibly activating the trailer emergency brakes, The emergency brakes will come on automatically as soon as a major leak occurs, Nothing, but braking power will be reduced, Air pressure will quickly leak away, even if you are not using the service brakes, Using a combination of the emergency air line and the service air line, Supply air will be sent to the service line instead of going to charge the trailer air tanks which means the trailer spring brakes will not release, Newer vehicles automatically detect if the lines are crossed and will auto-correct itself, Air will continue filling the air holding tanks until the tanks rupture from excessive pressure, Supply air will cause all brakes to release and the truck will roll freely without any braking ability, Trailers typically do not have their own air tanks, Designed to turn off the truck engine when a brake failure occurs, Used in the service and supply air lines at the back of trailers used to tow other trailers, Placed at each trailer spring brake and are designed to engage the emergency brakes when air pressure becomes too high, The yellow and red air control knobs located in the cab of a truck, Used to secure the trailer kingpin to the tractor 5th wheel, Caps which cover the valve stems on tires, A name for the yellow and red air valves in the cab of a truck, Coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer, Email Updates When New Articles Are Posted. Have little braking power because they are small All ABS equipped units re-couple, You can if you want to, it does not matter. B. the emergency line valve open and release air D They are not only longer, but also need more space because they cannot be turned or stopped suddenly. 0000006015 00000 n The pressure in the service line tells how much pressure the relay valves should send to the trailer brakes. Also available in App Store & Google Play. If the fifth wheel on a coupling is too far forward, the tractor frame may hit? not have spring brakes. A Describe what the trailer air supply control does. The road is dry and the visibility is good. which of these statements about managing space to the sides is true? However there are some states that allow doubles that are each 48 feet in length. 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. CDL Practice Tests 2023 - Doubles And Triples 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 _______. Which of these is NOT a good thing to do when driving on slippery roads? TestPermit.com provides free unofficial review materials for a variety of exams. When driving a double or triple trailer, greater care must be given to. These mirrors: make things seem smaller & further away then they really are. How do you know if your converter dolly is equipped with antilock brakes? When you do this, you should hear: Which of these statements about emergency steering is true? 3. 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. How should the converter dolly air tank drain valve on coupled double 11 Safety fail-safe features of a tractor-trailer converter dolly. behind the shut-off valve then they need to remain open. 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 should be
