A. opening the air tank petcock The word part ferrit- means: Which is most likely to tip over: 1 We'll help you make the right choices and prepare for a great start to your trucking career. Slow to the safe speed before entering, then accelerate slightly through the curve. What is one function of the tractor protection valve? How much space should be between the upper and lower fifth wheels? 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. 7. They provide the air pressure used to operate trailer brakes. Which of these are the correct positions for shut-off valves in doubles and triples? 2. You are doing a walk around inspection of a double or triple trailer This will let the rear wheels roll again and keep the rear wheels from sliding. For emergency braking you should: Older trailers do not have spring brakes. You wish to turn right from one two-lane, two-way street to another. DOUBLE/TRIPLE CDL Flashcards | Chegg.com Connect the Converter Dolly to the Rear Trailer: Test the coupling by pulling against the pin of the second semitrailer. You should hear air escaping, showing the entire system is charged. Hit the article to see the way to back up your trailer like a pro! Should the shut off valves on the rear of the first trailer be open or closed on a set of double trailers? A Take special care when pulling two and three trailers. Secure converter gear support in raised position. When does the "driver's manual" advise disconnecting the steering axle brakes to help keep the rig straight? Hook dolly to front trailer. New! Doubles/Triples Air Brake Check - digital.ncdcr.gov 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. With the red knob pushed in on the tractor dash, the service line should have air in it. When checking your air lines, they must be secure and? King pin. We are here to help. 2022 DE Doubles - Triples CDL Quick Review 1 - CristCDL.com That there is no space between upper and lower sixth wheel. How should the converter dolly air tank drain valve on coupled double How should you test the coupling? When testing trailer service brakes, you should use? Converter dollies: You are driving with double trailers and must use your brakes to avoid a crash. A CDL is required to drive any of the following vehicles: A vehicle with two separate parts - the power unit (tractor) and the trailer. You should NOT: You are driving a set of doubles and a set of trailer wheels goes into a skid. B. keep gentle pressure on the brakes while going through the water and for a short distance after coming out Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? The pressure in the service line tells how much pressure the relay valves should send to the trailer brakes. Email Updates When New Articles Are Posted. recouple. Converter dolly air tank drain valve: CLOSED. rear trailer. Therefore, look far ahead so you can slow down or change lanes gradually when necessary. 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. For emergency braking you should: You are driving a 100 foot twin trailer combination at 50 mph. You have not finished your quiz. CDL License Requirements State By State. D They provide the air pressure used to operate trailer brakes. Related Question Question: What does this sign mean? You can reset the test and retake it as needed. With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. Nothing, the weight of the trailer will keep it in place, 10. You should NOT: You must stop, yield to traffic and pedestrians, and only proceed when safe. can and will get stuck on a raised railroad crossing. It's a fifth wheel, not a sixth wheel. The converter dolly air tank drain valve on coupled double/triple trailers should be: You are driving a 100-feet truck with double trailers at 50 mph. Question 3 Explanation: All of the above. When checking the coupling system, make sure that the locking jaws are around the shank of the. On double and triple combinations, you must make sure that which of these is secure? B. allow one vehicle length for every 10,000 lbs of gross vehicle weight For emergency braking you should: which of these statements about emergency steering is true? A) closed . 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. 10 You will speak with recruiters today. some large trucks have curved (convex or spot) mirrors. If you have traffic on both sides of your vehicle and something is blocking your lane, a move to the right still be best. 0000009577 00000 n When checking the fifth wheel, you should make sure that it has enough? Describe what the trailer air supply control does. 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 A. release the spring brakes and check for movement All ABS equipped units Make sure the converter dolly air tank drain valve is closed. It is important to check the height of the trailer before connecting a converter dolly to a trailer. Any trailer with a reduced ground clearance C. the service brakes slowly move to the fully applied position, Some large trucks have converted or "spot" mirrors. 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. There is no requirement or exact standard for color coding. How do you know if your converter dolly is equipped with antilock brakes? What do you check when making a visual check of coupling? Therefore, it is very important for safety that you use wheel chocks when you park trailers without spring brakes. Pintle hook latched. D 0000005554 00000 n safe speed would be 40 MPH. A connection device of one axle used to disconnect a semitrailer combination vehicle you are visually checking the coupling of a converter dolly to the rear trailer. CDL Doubles and Triples Test Question and Answers 2023 [PDF]: Commercial Drivers License Doubles and Triples Endorsements Knowledge Test. Stay up to date on truck driving industry news. 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. Newer trailers have spring brakes just like trucks and truck tractors. [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]. At TruckingTruth we'll help you decide if trucking is right for you and help you get your career off to a great start. Number of wrong answers. the fifth wheel, so trailer is raised slightly when dolly is pushed under it. Each trailer and converter dolly has one or more air tanks. A dolly has lights, air tanks, air relays, air lines, air brakes, ABS, electrical connections, etc. A 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? Eventually, the air will leak away, and then there will be no brakes. The road is dry and the visibility is good. The rear trailers shut-off valves should be closed and the front open. 0000007487 00000 n You should be sure the converter dolly air tank drain valves are _______ & the pintle hook is __________. C A The pintle hook? The dolly tow bar may fly up, possibly causing injury, and making it very difficult to 0000002446 00000 n A. fully lowered Do converter dollies have spring brakes? A 2) the second test is to go out to the trailer to ensure that the parking brakes have indeed applied. Try our free CDL Doubles and Triples Test Question and Answers Quiz online. allow "much more space than is needed for ideal driving conditions". A Open, latched B Open, free C Closed, latched D Closed, free 28. 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. A. make things look smaller and farther away than they really are 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. Doubles and triples are more likely to turn over than other combination vehicles because of what effect? After 15 years on the road I wanted to help people understand the trucking industry and everything that came with the career and lifestyle of an over the road trucker. The heaviest trailer inspection of all equipment. What three methods can you use to secure a second trailer before coupling? B Which is most likely to tip over: These valves permit closing the air lines off when another trailer is not being towed. C. fully raised, Which of these statements about speed management and braking is true? Lock pintle hook. At section 2 downstream, the speed is 519 m/s. You will have greater length and more dead axles to pull with your drive axles than other drivers. dress gifs. Some do. What happens if you cross the Emergency Air Line and the Service Air Line? to re-capture it. 0000005664 00000 n 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. Which of these is most likely to occur? 0000001775 00000 n The road is dry, and visibility is good. D Locking jaws closed on This has the same value as the %%SCORE%% Variable on the Final Screen. Check them all. A-dolly. Remember: The trailer air brakes are supplied with air using the emergency line (also called the supply line). When the road is dry You must steer gently when pulling trailers. Open 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. Which of the following will occur? A converter dolly is a piece of equipment designed to allow commercial trucks, such as semi-trucks, to pull a trailer. You should keep at least ____ seconds of space ahead of you. You can test that air is flowing to all trailers by opening? A converter dolly is still under the second trailer when you unlock the pintle hook. Study section 6.2 if you can't answer all of these questions. D The front trailer in a set of double trailers is most likely to turn over due to the Crack-the-Whip effect. These dollies will have a yellow lamp on the left side of the dolly. Pintle-eye of dolly in place in pintle hook of trailer (s). The emergency brakes come on whenever air pressure in the emergency line is lost. What value of channel width must the design use? which of these is not a good thing to do when driving on slippery roads? Some large trucks have curved (convex or spot) mirrors. B. pull gently against the pin of the second semitrailer To check air flows to all trailers, you should let air pressure reach normal then? 0000006015 00000 n 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. 0000007508 00000 n The A-dolly has a single drawbar with a single, centered hitching point. Pull gently against the pin of the second trailer. 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 crack the whip effect will topple the rear trailer first. A. countersteer Trucks with trailers have a dangerous crack-the-whip effect. 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. 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 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. A sudden movement with the steering wheel can result in a tipping over rear trailer. A. you can steer more quickly and safely if you hold the wheel with one hand When you do this, you should hear: 7.3 Inspecting Doubles and Triples = Additional Things to Check During a Walkaround Inspection. A thorough pre-trip inspection should catch any major service line leaks before you begin your trip. The road is dry and visibility is good. A 360 degree area of awareness is Also available in App Store & Google Play. B You should reduce your speed by about _____ on a wet road. Hit the article below to see specific information about AOBRDs! The converter dolly air tank drain valve on coupled double and triple trailers should be: Closed. Open the emergency line shut-off valve at the rear of the last trailer. Push the brake pedal as hard as you can and hold it there You will not be tested on uncoupling twins unless you want to get a double/triple trailer endorsement on your license. We have a new version of this program. Doubles and triples are more likely to overturn than other combination vehicles because of the whip cracking effect.
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