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Learn more and apply here: TruckingTruth was founded by Brett Aquila (that's me! 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. By clicking on "Sign Up", you agree to our Terms of Use and Privacy Policy. These mirrors: All trademarks are property of their respective owners. allow "much more space than is needed for ideal driving conditions". A) closed . Use the engine brake or speed retarder. Any vehicle, regardless of size, designed to transport 16 or more persons, including the driver. 6. Charge the system and pump the brakes with the window down. 0000003261 00000 n
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 You will speak with recruiters today. Only trailers designed to be pulled with another trailer behind it will have a shut off valve.
PDF Doubles and triples 1. The stopping distance for a tractor trailer Should the shut off valves on the rear of the first trailer be open or closed on a set of double trailers? Flammable materials in the front trailer then it must have the placards on that trailer. You should keep at least _____ seconds of space ahead of you. You should NOT: You are driving a set of doubles and a set of trailer wheels goes into a skid. A Push the brake pedal as hard as you can and hold it there A CDL is required to drive any of the following vehicles: A vehicle with two separate parts - the power unit (tractor) and the trailer. A. require shorter stopping distances than full ones 10. Please wait while the activity loads. 0000003977 00000 n
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When testing trailer service brakes, you should use? 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. cQ
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The road is dry and the visibility is good. The front trailer in a set of double trailers is most likely to turn over due to the Crack-the-Whip effect. Doubles and triples are more likely to turn over than other combination vehicles because of the "crack-the-whip" effect. Only a certified diesel mechanic can check this. This would be very dangerous.
CDL Practice Tests 2023 - Doubles And Triples There are more things that can go wrong, and doubles/triples are less stable than other commercial vehicles. Be more careful in adverse conditions. Older trailers do not have spring brakes. A. the total stopping distance of a truck is the distance it takes to stop once the brakes are put on at any speed What will happen if there is a major leak in the service air line? 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 _______.
Often do not have spring brakes 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. To prevent trailers from rolling over, you must steer gently and go slowly around corners, on ramps, off ramps and curves. This will prevent water and dirt from getting into the coupler and the air lines. A sudden movement with the steering wheel can result in a tipping over rear trailer. 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). Open, free 1) the first one is to pump down the air pressure in the system between 20 and 45psi (pounds per square inch) the trailer air supply will pop out, shutting air off to the trailer. B. use only the trailer brakes Locking jaws closed on The shut off valves prevent air from going any further. These dollies will have a yellow lamp on the left side of the dolly Questions You Should Know For Doubles And Triples 1. Doubles/triples flip flop over from quick steering moves more easily than many vehicles. you should check the trailer height before connecting a converter dolly to a second or third trailer. Watch the wording of the question AND the answers A safe driver will look for all of the above. 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. trailer
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What is one function of the tractor protection valve? Which of these statements about quick steering movements and doubles/triples is true? d. protein. The converter dolly air tank drain valve on coupled double/triple trailers should be: Closed. You should keep at least ____ seconds of space ahead of you. B 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. Because of this, which of the following vehicle parts is most likely to tip over? 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. Related Question Question: What does this sign mean? 0000008187 00000 n
Tractor-trailers are considered combination vehicles. 1/2 to 3/4 of an inch The driver will be required to complete this requirement in three eight hour shifts. You shouldn't stop braking. What's a converter dolly? Doubles and triples are more likely to overturn than other combination vehicles because of the whip cracking effect. C. posted speed limits on curves are safe for all trucks, Empty trucks: These valves permit closing the air lines off when another trailer is not being towed. These valves permit closing the air lines off when another trailer is not being towed. D For emergency braking you should: You are doing a walk around inspection of a double or triple trailer rig. B. the emergency line valve open and release air Doubles and triples are more likely to turn over than other combination vehicles because of the "crack- the-whip" effect. 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. 1/4 in. A major leak in the emergency line will cause the tractor protection valve to close and the trailer emergency brakes to come on. Park the rear trailer against another trailer, chock the tires and lock the trailer Park on level ground, put chock on the tires, and charge the air tank. You should hear air escaping, showing the entire system is charged. 0000008166 00000 n
The shut off valves, when in the open position, allows air to flow out to another trailer. It is very important to keep the air supply clean. and possible answers include: open, free or closed, latched or closed, free or open, latched from TruckersDouble & Triple Trailer (CDL) Endorsement. Simply click in your answer to each CDL practice test question. You open the emergency line shut-off valve at the rear of the last trailer and hear air escaping. The rear trailer of a triple The dolly tow bar may fly up If your tractor protection valve doesn't work properly, then if an air hose starts to leak what could happen? A thorough pre-trip inspection should catch any major service line leaks before you begin your trip. 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. Should I Be A Truck Driver? You want to lock your combination to a second trailer that has no spring brakes. A
Page 1 - Doubles/Triples Test Study Guide for the CDL A. air escape from the open valve
The converter dolly air tank drain valve on coupled double/triple Trailer Air Tanks And Shutoff Valves - TruckingTruth On the first trailer in a set of doubles? True or False? Converter dolly air tank drain valve: CLOSED. What do you check when making a visual check of coupling? 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. C. back up slightly and make a visual check of the coupling, You are driving with double trailers and must use your brakes to avoid a crash. Also available in App Store & Google Play.
Why should you check for when inspecting the converter dolly? Go to Section 4: Other Topics This question is in Section 4: Other Topics of our CDL Test Guide. Connect Converter Dolly to Rear Trailer Make sure trailer brakes are locked and/or wheels chocked. Once that's complete, then its an easy push back and the With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. What does the Commercial Driver Handbook say about how much space you should keep ahead of your truck? There is no obligation whatsoever. Once you have coupled your rear trailer, you should test the coupling by? What happens when there is a major leak in the emergency air line? What should you check for when inspecting the converter dolly and the pintle hook? If not, there is a problem. Each trailer and converter dolly has one or more air tanks. 0000006383 00000 n
The application only takes one minute. Go to the rear of the rig. The coupling between a rear trailer and a dolly should have a space between the upper and lower fifth wheels of? which of these statements about managing space to the sides is true? Air pressure is sent from the air tanks to the brakes by relay valves. 0000006836 00000 n
They provide the air pressure used to operate trailer brakes. Air flows steadily and isentropically through a passage. A truckers workspace is a small moving office Read More. a. blood Seriously! A turn of the glad hand attached to the hose will join and lock the couplers. It is important to check the height of the trailer before connecting a converter dolly to a trailer. A dolly has lights, air tanks, air relays, air lines, air brakes, ABS, electrical connections, etc. B. open; latched
At section 2 downstream, the speed is 519 m/s. A C. use controlled or stab braking, The best way to stop any skid is to: TestPermit.com provides free unofficial review materials for a variety of exams. 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? 0000003998 00000 n
That there is no space between upper and lower fifth wheel. dress gifs. Contributor: Luke Nold (Experienced truck driver for 5+ years and published writer for Fleet Magazine). What value of channel width must the design use? Ensuring the safety of the public starts with a thorough inspection of all equipment. To do this without wheels chocks you should: Supply air to the trailer air system with the tractor and then disconnect the emergency line. They are not only longer, but also need more space because they cannot be turned or stopped suddenly. c. iron A low air buzzer will go off indicating something is wrong and either the front or the You must treat a flashing red signal as you would treat a STOP sign. This has the same value as the %%TIME_ALLOWED%% Variable on the Final Screen. Slow to the safe speed before entering, then accelerate slightly through the curve. Which of these are the correct positions for shut-off valves in doubles and triples? B. allow one vehicle length for every 10,000 lbs of gross vehicle weight The final procedure when connecting a rear trailer is to? 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. The tanks will hold enough air to allow the brakes to be used several times even if the compressor stops working. kingpin. Pickup at South Loop. B The heaviest trailer Join 50,000+ users around America to get your Commercial Driver License today! B. keep other traffic out of your side space 3. axle will have spring brakes due to the weight of the unit. 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 Double and triple trailers increase not only the operators risk of safety, but also the other motorists around him.
Doubles/Triples Endorsement Flashcards | Quizlet How much space should be between the upper and lower fifth wheels? The converter dolly is an auxiliary axle with a coupling device. Open the emergency line shut-off valve at the rear of the last trailer. paramount to safe driving. Safety fail-safe features of a tractor-trailer converter dolly. Use only the trailer brakes To do this without wheel chocks you should: When uncoupling the rear semitrailer, you should lower the converter dolly landing gear: When driving a double or triple, you need more space because they: Which of these statements about emergency steering is true? When you are pulling trailers, which of the following statements is true about steering? If spare tire is carried on converter gear (dolly), make sure it's secured. We wish you the best of luck in your endeavors and are pleased to be of assistance. You should be sure the converter dolly air tank drain valves are _____ and the pintle hook is ____. If your converter dolly has to be moved over a distance to bring it to your semitrailer, you should? doubles/triples flip flop over from quick steering movements more easily than many other vehicles. behind the shut-off valve then they need to remain open. 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. How do you check to make sure trailer height is correct before coupling? Close the emergency line shut-off valve at the rear of the trailer. All other trailer air functions use the emergency line. When driving a double or triple trailer, greater care must be given to. For a particular IC-fabrication process, the transconductance parameter kn=400A/V2,k_{n}^{\prime}=400 \mu \mathrm{A} / \mathrm{V}^{2},kn=400A/V2, and Vt=0.5V.V_{t}=0.5 \mathrm{V}.Vt=0.5V. 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! Take special care when pulling two and three trailers. Question 4. Remember however, that is just a suggestion. 8. 0000009556 00000 n
The couplers have a rubber seal that prevents air from escaping. Driving doubles/triples is also more dangerous in hot and cold weather driving, as well as on mountain roads. The number of correct answers. When coupling twin trailers, you should _______ the pintle hook and secure the dolly support in the _______ position. B. you should avoid traveling next to others whenever possible mTouch Quiz will automatically populate the fields below. C True False True If you want to couple a second trailer to you combiantion vehicle, secure it by using the: Trailer emergency air brakes. Definition. front of the second trailer. Refers to pulling two trailers at the same time, otherwise known as "pups" or "pup trailers" because they're only about 28 feet long. What is likely to happen? A. use light, steady pressure on the brake pedal B on kingpin. When the road is slippery To do this without wheel chocks you should: Empty trucks: When parking your double or triple combination, you should look for a parking space When entering a roundabout, a driver must yield the right-of-way to drivers already in the roundabout and obey all traffic signs. You should be sure the converter dolly air tank drain . 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. Locking jaws closed on HlTo xGf`{iIMh-x||?pbE':X4ZZZRbu7 uvi_RHUkVXBVu{^B3
4e/iw\]RE] YY7i)e V*h(++WQ-]Xm9c5yU6BS" 5HiL,[b)ee:t/ )%BVGpU7T\ZJD 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. 4. 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 number and size of air tanks varies among vehicles. Which of the following statements about off tracking is true? A. open With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. Number of wrong answers. Which of these is most likely to occur? It depends on the load 0000002636 00000 n
A. hand valve you are driving a 100ft truck eith double trailers at 50mph.
2003-2023 Chegg Inc. All rights reserved. 2 . Safety chains should be secured to trailer(s). You are driving a 100 ft twin trailer combination at 50 mph. What should you check for when inspecting a converter dolly? A Commercial Drivers License Overview, Trucking Terminology and Transportation Definitions. King pin. B You must steer gently when pulling trailers. Blue is used for the service lines, and red for the emergency (supply) lines. Ship to Store. 0000005345 00000 n
When the road is dry _______ should be tested with the hand valve but controlled in normal operation with the foot pedal. In the coupling system, the locking jaws should be fixed around? driven with care to avoid losing control, Make sure the spare tire is secured, if it has one, Make sure the converter dolly air tank drain valve is closed, Make sure safety chains are secured to the trailers, All of the above. Why should you use chocks when parking a trailer without spring brakes? A full trailer behind a truck you are visually checking the coupling of a converter dolly to the rear trailer. This will supply air to the emergency (supply) lines. You are driving with more than one trailer. You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. What is most likely to happen if the trailer protection valve of a double or triple trailer does not function correctly? Clean the couplers and rubber seals before a connection is made. A. closed; latched 11 During normal operation the brakes of the double/triple trailer are controlled by: 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. 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. We'll help you make the right choices and prepare for a great start to your trucking career. To check that the trailer emergency brakes are working properly, you should pull out the trailer air supply control and? B When you do this, you should hear: Which of these statements about emergency steering is true? Therefore, it is very important for safety that you use wheel chocks when you park trailers without spring brakes. . which of these statements about quick steering movements and doubles/triples is true? 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. What happens if you cross the Emergency Air Line and the Service Air Line? How do you check to make sure trailer height is correct before coupling? You are driving a tractor with multiple trailers. If one air system is very low on pressure _______. When you do this, you should hear: Always unlock the pintle hook with the dolly still under the rear trailer. The dolly tow bar may fly up, possibly causing injury, and making it very difficult to You should check the height of the trailer before connecting a converter dolly to a second or third trailer. But the brakes will hold only as long as there is air pressure in the trailer air tank. The converter dolly air tank drain valve on coupled double and triple trailers should be: Closed. Provides a snug fit to eliminate unwanted seepage of air or water. You should be sure the converter dolly air tank drain valves are _______ & the pintle hook is __________.
2022 DE Doubles - Triples CDL Quick Review 1 - CristCDL.com It's a fifth wheel, not a sixth wheel. The shortest trailer There are two types of converter dollies. It is important not to let water and oil build up in the air tanks. 5. When checking the fifth wheel, you should make sure that it has enough? You must stop, yield to traffic and pedestrians, and only proceed when safe. Converter dollies: slow to safe speed before entering, then accelerate slightly through the curve. You should reduce your speed by about _____ on a wet road. 0000001354 00000 n
Do converter dollies have spring brakes?
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Does a converter dolly have a separate air tank? - Wisdom-Advices When does the "driver's manual" advise disconnecting the steering axle brakes to help When uncoupling, you should never unlock the _______ with the dolly still under the rear trailer. 0000001162 00000 n
B. slightly open
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A. for coupled doubles and triples, be sure that the pintle hook is in the open position D 7. Release Dolly breaks by opening the air tank petcock or if the dolly has a spring break, use the Dolly parking brake control . This has the same value as the %%SCORE%% Variable on the Final Screen. NPT thumbscrew style design enables easy installation.