You should keep at least ___ seconds of space ahead of you. you are doing a walkaround inspection of a double or triple trailer rig. 8. 0000001107 00000 n B When coupling twin trailers, a converter dolly is. Pintle hook latched. Connect Converter Dolly to Rear Trailer Make sure trailer brakes are locked and/or wheels chocked. Explore now! Why should you check for when inspecting the converter dolly? These dollies will have a yellow lamp on the left side of the dolly. Always test the trailer brakes before driving with the hand valve or by pulling the air supply (tractor protection valve) control. Each trailer and converter dolly has one or more air tanks. Make sure you do not get in a spot you cannot pull straight through. If this activity does not load, try refreshing your browser. weather passes. A converter dolly is still under the second trailer when you unlock the pintle hook. You may not notice a major leak in the service line until you try to put the brakes on. The shut off valves prevent air from going any further. The front trailer in a set of double trailers is most likely to turn over due to the Crack-the-Whip effect. Which of these is most likely too occur? 0000009577 00000 n Typically depends on the axle count. some large trucks have curved (convex or spot) mirrors. What should you check for when inspecting the converter dolly? Secure converter gear support in raised position. These trailers have no parking brake. The crack the whip effect will topple the rear trailer first. You must stop, yield to traffic and pedestrians, and only proceed when safe. Each trailer and converter dolly has one or more air tanks. For emergency braking you should: kingpin. If you crossed the air lines, you could drive away, but you would not have trailer brakes. Have little braking power because they are small Then, the air loss from the leak will lower the air tank pressure quickly. you are visually checking the coupling of a converter dolly to the rear trailer. when does the drivers manual say you should disable the steering axle brakes? You are driving a 100 foot twin trailer combination at 50 mph. 0000006383 00000 n Only a certified diesel mechanic can check this. That there is some space between the upper and lower fifth wheel. These valves permit closing the air lines off when another trailer is not being towed. We'll help you make the right choices and prepare for a great start to your trucking career. What is a converter dolly? A. for coupled doubles and triples, be sure that the pintle hook is in the open position You are visually checking the coupling of a converter dolly to the rear trailer. which of these statements about the handling of doubles and triples is true ? The emergency line valve open and release air 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? You should check the height of the trailer before connecting a converter dolly to a second or third trailer. The number and size of air tanks varies among vehicles. Use the engine brake or speed retarder. What will happen if there is a major leak in the service air line? What is a converter dolly? | Samsara A bent or damaged kingpin on a coupling should be? To prevent trailers from rolling over, you must steer gently and go slowly around corners, on ramps, off ramps and curves. What three methods can you use to secure a second trailer before coupling? 0000010705 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 Which of these are the correct positions for shut-off valves in doubles and triples? 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. Which diagram shows the best way to turn? This has the same value as the %%TOTAL%% Variable on the Final Screen. 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. Locking jaws open The puzzle: At the far left edge, the plates are in contact, so the path length difference between rays 222 and 333 is zero. If there is a trailer fifth wheel, so trailer is raised slightly when dolly is pushed under it. Time limit varies by state. A How do you know if your converter dolly is equipped with antilock brakes? 7.3 Inspecting Doubles and Triples = Additional Things to Check During a Walkaround Inspection. The pressure in the service line tells how much pressure the relay valves should send to the trailer brakes. Slow to the safe speed before entering, then accelerate slightly through the curve. Join 50,000+ users around America to get your Commercial Driver License today! B If your tanks have automatic drains, they will keep most moisture out, but you should still open the drains to make sure. If you have traffic on both sides of your vehicle and something is blocking your lane, a move to the right still be best. When checking your air lines, they must be secure and? To check air flows to all trailers, you should let air pressure reach normal then? You should NOT: What does the Driver's manual say about how much space you should keep ahead of your truck? During normal operation the brakes of the double/triple trailer are controlled by: You are driving at night and you must dim your headlights for traffic. The lighter trailer should be in the rear. 0000007508 00000 n When uncoupling, you should never unlock the _______ with the dolly still under the rear trailer. Be more careful in adverse conditions. With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. This has the same value as the %%TIME_USED%% Variable on the Final Screen. If you do, there is a problem. [California Commercial Driver Handbook] The weight of a truck: Is a major factor affecting stopping distance. 9 Go to Section 4: Other Topics This question is in Section 4: Other Topics of our CDL Test Guide. 4. Trailer Air Tanks And Shutoff Valves - Page 50. Any trailer with a reduced ground clearance Converter dolly air tank drain valve: CLOSED Air lines supported and glad hands properly connected. Slow to the safe speed before entering, then accelerate slightly through the curve. These dollies will have a yellow lamp on the left side of the dolly Questions You Should Know For Doubles And Triples 1. 0000001354 00000 n The air lines will rupture A major leak in the emergency line will cause the tractor protection valve to close and the trailer emergency brakes to come on. What's a converter dolly? 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. 10. What three methods can you use to secure a second trailer before coupling? At TruckingTruth we'll help you decide if trucking is right for you and help you get your career off to a great start. The road is dry and visibility is good. Park on level ground, put chock on the tires, and charge the air tank. Air Storage and Drain Tanks: Air storage tanks are used to hold compressed air. C. may have poor traction due to bouncing and wheel lockup, Before you can supply air to the air tanks of a second trailer you need to: The number of correct answers. Eventually, the air will leak away, and then there will be no brakes. the fifth wheel, so trailer is raised slightly when dolly is pushed under it. Safety should never take second place, so know your stuff! 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. 11 Antilock Braking Systems on Converter Dollies, Converter dollies built on or after March 1, 1998, are required to have antilock brakes. A Pull gently against them in a low gear to make sure the brakes work. A good and safe driver will always look out for ______. "Glad hands" are coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer. The road is dry and the visibility is good. safe speed would be 40 MPH. A connection device of one axle used to disconnect a semitrailer combination vehicle HlTo xGf`{iIMh-x||?pbE':X4ZZZRbu7 uvi_RHUkVXBVu{^B3 4e/iw\]RE] YY7i)e V*h(++WQ-]Xm9c5yU6BS" 5HiL,[b)ee:t/ )%BVGpU7T\ZJD Make sure to visually inspect the fifth wheel and that the locking mechanism is The Doubles and Triples written CDL Exam is required for your doubles and triples endorsement. you are driving at night and you must dim your headlights for traffic. 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. 0000008915 00000 n B if you have traffic on both sides of your vehicle and something is blocking your lane, a move to the right still be best. Take special care when pulling two and three trailers. Page 7-6 Commercial Driver's Manual/2.0 = Be sure air lines are supported and glad hands are properly connected. The shortest trailer Finsbury Pump Systems 400l (Single Stage) 5.5hp Honda Gx Petrol Engine 0000003240 00000 n Why should you not use the trailer hand valve while driving? It is very important to keep the air supply clean. Your vehicle is so long that you must swing wide to make the turn. The converter dolly air tank drain valve on coupled double/triple Remember: The trailer air brakes are supplied with air using the emergency line (also called the supply line). True False True If you want to couple a second trailer to you combiantion vehicle, secure it by using the: Trailer emergency air brakes. Before you can supply air to the air tanks of a second trailer you need to: Open the shut-off valves at the rear of the first trailer and close the shut-off valves at the rear of second trailer. how can you be sure you supplied air to a second trailer? To help avoid mistakes, colors are sometimes used. If the spring brakes do not release when you push the trailer air supply control, check the air line connections. Take this same test in our other testing modes How to Get a Hazardous Materials Endorsement, What is a CDL? You should keep at least ____ seconds of space ahead of you. Which of the following will occur? What is likely to happen? Some vehicles have dead end or dummy couplers to which the hoses may be attached when they are not in use. Trucks with trailers have a dangerous crack-the-whip effect. 0000002446 00000 n 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. Please visit using a browser with javascript enabled. the crack-whip effect that triubkes trucks with trailers is most likely to cause a tip over when. S-cam brakes are the most common style brakes on large trucks today. What three methods can you use to secure a second trailer before coupling? Once that's complete, then its an easy push back and the When testing the coupling of the double trailer the landing gears of the rear trailer should be: You want to hook your combination to a second trailer that has no spring brakes. Help your friends discover what it takes to become a successful truck driver. How do you check to make sure trailer height is correct before coupling? A. brake and downshift in a curve Safety fail-safe features of a tractor-trailer converter dolly. A. air escape from the open valve The dolly tow bar may fly up, possibly causing injury and making it very difficult to re-couple. When you do this, you should hear: retrovirus $_____________________________$. _______ should be tested with the hand valve but controlled in normal operation with the foot pedal. Be certain you are clear at the sides before changing lanes. The dolly tow bar may fly away, possibly causing panic, and making it very difficult The couplers have a rubber seal that prevents air from escaping. Open, free Some areas of concern are discussed below. Doubles/Triples Endorsement Flashcards | Quizlet [California Commercial Driver Handbook] The weight of a truck: Is a major factor affecting stopping distance. In order to receive your Doubles and Triples endorsement, it is required that you pass the states official CDL written Knowledge exam. 11 During normal operation the brakes of the double/triple trailer are controlled by: The dolly tow bar may flip up causing bodily injury and making it very difficult to securely fastened. A converter dolly is If a converter dolly has spring brakes, you release the brakes by You have connected the converter dolly to the front semitrailer and then connected the rear semitrailer to the converter dolly. C View the full article to see how to set cruise control correctly! 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. Connect the Converter Dolly to the Rear Trailer: Test the coupling by pulling against the pin of the second semitrailer. Hit the article below to see specific information about AOBRDs! Older trailers do not have spring brakes. In a certain electronic device, a three-stage amplifier is desired, whose overall voltage gain is 42 dB. Mar 2 - Mar 3. Doubles and triples are more likely to turn over than other combination vehicles because of the "crack- the-whip" effect. These mirrors: Make things seem smaller and further away than they really are. How do you check to make sure trailer height is correct before coupling? fumoto drain valve. 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. Some do. 1/32 to 3/32 of an inch. unsafe slow down even further, or better yet, find a safe haven and park until the Provides a snug fit to eliminate unwanted seepage of air or water. When does the Driver's manual say you should disable the steering axle brake? DMV Doubles Triples Practice Test | CDL Knowledge Use only the trailer brakes 2. How can you be sure you supplied air to a second trailer? What should you check for when inspecting a converter dolly? Double/Triple Flashcards | Quizlet There are two types of converter dollies. You have not finished your quiz. B. you can almost always stop more quickly than you can turn 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. B B. are the easiest to stop since there is no shifting cargo 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. If it goes low enough, the trailer emergency brakes will come on. A Open rear trailer. To check that the trailer emergency brakes are working properly, you should pull out the trailer air supply control and? Charge the system and pump the brakes with the window down. kingpin, That there is grease between upper and lower fifth wheel. Chock the tires, park on level ground and charge the trailer air tank if it does [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." When does the "driver's manual" advise disconnecting the steering axle brakes to help keep the rig straight? All other trailer air functions use the emergency line. [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]. C. use stab or controlled braking, Which of these is true? mTouch Quiz will automatically populate the fields below. Air will not be available to release the trailer spring brakes (parking brakes). Our normal business hours are Monday-Friday 8 a.m. to 5 p.m. (Pacific Time). The trailer is at the correct height when. How can you test that air flows to all trailers? your vehicle is so long that you must swing wide to make a turn. 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. If a converter dolly is still under the second trailer and you unlock the pintle hook, what will probably happen? Air escape from the open valve B The service brakes slowly move to the fully applied position C The emergency line valve open and release air D None of the above 4. B. open; latched Doubles Triples Endorsement Test Flashcards | Quizlet A A CDL is required to drive any of the following vehicles: A vehicle with two separate parts - the power unit (tractor) and the trailer. When doing a walkaround inspection of a double or triple trailer, the shut-off valves should be _______ at the rear(s) of the front trailer(s) and ________ at the rear of the last trailer. Time used (Requires timer add on). Air pressure is sent from the air tanks to the brakes by relay valves. B. the emergency line valve open and release air You may be timed. 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. Converter dollies: If spare tire is carried on converter gear (dolly), make sure it's secured. You are doing a walk around inspection of a double or triple trailer rig. B You will speak with recruiters today. The dolly will have a yellow lamp on the drivers (left) side. This means. C. open, except the one connected to the rear trailer should be closed, During normal operation the brakes on double and triple trailers are controlled by the: On the first trailer in a set of doubles? open, closed, closed: Term. Any items you have not completed will be marked incorrect. A major leak in the emergency line will cause the tractor protection valve to close and the trailer emergency brakes to come on. The trailer brakes will unlock Usually need a glad hand converter Types of converter dollies. If the converter dolly is close to your semitrailer, you should wheel it into position? Blue is used for the service lines, and red for the emergency (supply) lines. Never pull any trailer without visually inspecting the fifth wheel locking bar Trailer Air Tanks And Shutoff Valves - TruckingTruth 4. Calculate the voltage gain of each. 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. D Which of the following must be connected when coupling tractor to trailer or trailer to trailer? The driver will be required to complete this requirement in three eight hour shifts. speed and start spinning again, in turn stopping your skid, All the listed answers would be correct. The application only takes one minute. on kingpin. When driving a double or triple trailer, greater care must be given to. 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. The last trailer in a combination is most likely to turn over. Stay up to date on truck driving industry news. A. allow "much more space" than is needed for ideal driving conditions 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. cell Hook dolly to front trailer. B. do not need to be checked as often as flat mirrors because they show a larger area D. Make sure the spare tire is secured, if it has one. Calculate the net energy change in kilojoules per mole that takes place on formation of MgF2_22(s) from the elements: Heat of sublimation for Mg(s) = 147.7 kJ/mol Eea_{ea}ea for F(g) = -328 kJ>mol, Bond dissociation energy for F2_22(g) = 158 kJ>mol Ei1_{i1}i1 for Mg(g) = 737.7 kJ>mol, Electrostatic interactions in MgF2_22(s) = -2957 kJ/mol Ei2_{i2}i2 for Mg(g) = 1450.7 kJ/mol. Your tractor protection valve control should pop out, or go from normal to emergency position, when air pressure falls into what range? The road is dry and visibility is good. 9. While inspecting your converter dolly coupling, you should make sure there is _____ between the upper and lower fifth wheel. What types of trailers can get stuck on raised crossings? Seriously! B. you should avoid traveling next to others whenever possible 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. C. foot pedal, Which of these statements about managing space to the sides is true? Close the emergency line shut-off valve at the rear of the trailer. Visually check to make sure that the lead trailer is slightly higher than the center of When you do this, you should hear: Ais escape from the open valve. Which of these statements about managing space to the sides is true? C. 3, You are doing a walk around inspection of a double or triple trailer rig. Driving doubles/triples is also more dangerous in hot and cold weather driving, as well as on mountain roads. You should be sure the converter dolly air tank . A. use the engine brake or speed retarder When inspecting a converter dolly What should you check for? Refers to pulling two trailers at the same time, otherwise known as "pups" or "pup trailers" because they're only about 28 feet long. You shouldn't stop braking. 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. will have a lamp on the drivers side. It's a fifth wheel, not a sixth wheel. B. allow one vehicle length for every 10,000 lbs of gross vehicle weight Question 3 Explanation: All of the above. You are driving a tractor with multiple trailers. When the road is slippery The coupling between a rear trailer and a dolly should have a space between the upper and lower fifth wheels of? 0000003977 00000 n The braking systems of double and triple trailers are different than those of straight trucks because doubles and triples. Delivering to. A vehicle transporting hazardous materials is required to display placards where? 0000008187 00000 n To test the tractor protection valve, charge the trailer air brake system, turn off the engine, and A. use a low gear For all brakes to work on a triple combination, you must have air supply? The tanks will hold enough air to allow the brakes to be used several times even if the compressor stops working. That split second that you release the brakes will allow them to match the vehicles road To check if the converter dolly is securely coupled to the rear trailer you should: Pull gently against the pin of the second trailer. On the middle trailer of a set of triples? Once you are finished, click the button below. D Be sure pintle-eye of dolly is in place in pintle hook of trailer(s). you should check the trailer height before connecting a converter dolly to a second or third trailer. Time allowed (Requires timer add on). The heaviest trailer "Glad hands" are coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer. However, converter dollies and trailers built before 1975 are not required to have spring brakes. Like a trailer, a dolly equipped with ABS will have a yellow indicator light on the left side. D That there is no space between upper and lower sixth wheel. The emergency brakes come on whenever air pressure in the emergency line is lost. Air escape from the open valve You are driving with double trailers and must use your brakes to avoid a crash. What is most likely to happen if the trailer protection valve of a double or triple trailer does not function correctly? The service brakes slowly move to the fully applied position Doubles/triples flip flop over from quick steering moves more easily than many vehicles. C 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? There is no obligation whatsoever. Good speed management says you should: You must drive through deep or flowing water. This will prevent water and dirt from getting into the coupler and the air lines. 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. Related Question Question: What does this sign mean? 10 Lock pintle hook. A. opening the air tank petcock 0000008894 00000 n B. closed Which the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the trailer. At section 2 downstream, the speed is 519 m/s. Submit your email at the end of the test. Doubles/Triples Air Brake Check - digital.ncdcr.gov 2023 WV Doubles - Triples CDL Practice Test 1 - CristCDL.com They are filled by the emergency (supply) line from the tractor. Doubles and triples are more likely to overturn than other combination vehicles because of the whip cracking effect. PDF Section 7: Doubles and Triples - CDL Study Safety chains secured to trailer (s). There is more chance for skids and loss of traction. You are driving with more than one trailer. It is important not to let water and oil build up in the air tanks. When does the "driver's manual" advise disconnecting the steering axle brakes to help B. keep other traffic out of your side space Therefore, it is very important for safety that you use wheel chocks when you park trailers without spring brakes.

Grass Valley, Oregon Abandoned School, Montessori Progress Reports, Hobart Coach Foster, Sugar Solution Density Calculator, Articles T