Pickup at South Loop. You must stop, yield to traffic and pedestrians, and only proceed when safe. how much space should be between the upper and lower fifth wheel? B How should you test the coupling? What does the Driver's manual say about how much space you should keep ahead of your truck? Pull gently against the pin of the second trailer. Any trailer, 7. You are doing a walk around inspection of a double or triple trailer rig. Should the shut-off valves on the rear of the last trailer be open or closed? With the red knob pushed in on the tractor dash, the service line should have air in it. 7. The heavier trailer should be in the rear. A. open the shut-off valves at the rear of both trailers 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. Which is most likely to tip over: Lock pintle hook. Any combination of vehicles with a gross combined weight rating (GCWR) of 26,001 or more pounds, providing the gross vehicle weight rating (GVWR) of the vehicle being towed is in excess of 10,000 pounds. Which of these are the correct positions for shut-off valves in doubles and triples? 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. On the middle trailer of a set of triples? When driving with more than one trailer, which trailer should be the first one behind the tractor? When you do this, you should hear: you are driving with double trailer and must use your brakes to avoid a crash. Safety chains should be secured to trailer(s). C Which diagram shows the best way to turn? A. opening the air tank petcock This has the same value as the %%TIME_ALLOWED%% Variable on the Final Screen. locked . Wait for air pressure to reach normal, then push in the red trailer air supply knob. Terms in this set (43) Converter dollies are used to connect: A tractor-trailer combination to another trailer. HlTo xGf`{iIMh-x||?pbE':X4ZZZRbu7 uvi_RHUkVXBVu{^B3 4e/iw\]RE] YY7i)e V*h(++WQ-]Xm9c5yU6BS" 5HiL,[b)ee:t/ )%BVGpU7T\ZJD B Secure converter gear support in raised position. 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. To check that the trailer emergency brakes are working properly, you should pull out the trailer air supply control and? You can test that air is flowing to all trailers by opening? These valves permit closing the air lines off when another trailer is not being towed. 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. We are an independent company focused on providing valuable motor vehicle and permit practice test information. Calculate the voltage gain of each. The dolly tow bar may fly up, possibly causing injury and making it very difficult to re-couple. Remember however, that is just a suggestion. The Verge logo. A Which f these will result in the best control on curves? Which of these is NOT a good thing to do when driving on slippery roads? These valves permit closing the air lines off when another trailer is not being towed. 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. With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. The dolly tow bar may flip up causing bodily injury and making it very difficult to D You should look into the back of the fifth wheel on a dolly to see if it is locked onto the kingpin, A safe speed on a curve for a straight truck or a single trailer combination vehicle may be too fast for double or triple trailers. The trailer is at the correct height when. What should you check for when inspecting a converter dolly - Answers You open the emergency line shut-off valve at the rear of the last trailer and hear air escaping. High Road 2.0! 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: Ensuring the safety of the public starts with a thorough inspection of all equipment. If spare tire is on converter gear (dolly), make sure it is secured. The word part ferrit- means: Number of wrong answers. Hit the article to see the way to back up your trailer like a pro! When you do this, you should hear: Connect Converter Dolly to Rear Trailer Make sure trailer brakes are locked and/or wheels chocked. ADVERTISEMENT ADVERTISEMENT If there is a trailer 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. C. close the shut-off valves at the rear of the first trailer and open the shut-off valves at the rear of the second trailer, To check that the converter dolly is securely coupled to the rear trailer, you should: 3. A major leak in the emergency line will cause the tractor protection valve to close and the trailer emergency brakes to come on. For emergency braking you should: If you feel A. allow "much more space" than is needed for ideal driving conditions The driver must yield the right-of-way to other vehicles when merging and when entering a highway from an alley. Leave the emergency line shut-off valve closed and open the service line valve. You can reset the test and retake it as needed. You should be sure the converter dolly air tank drain . front of the second trailer. Some areas of concern are discussed below. Do converter dollies have spring brakes? Only a certified diesel mechanic can check this. When entering a roundabout, a driver must yield the right-of-way to drivers already in the roundabout and obey all traffic signs. 0000003261 00000 n This has the same value as the %%TIME_USED%% Variable on the Final Screen. When uncoupling a rear trailer, you should remove some weight from the dolly by? Nothing, the weight of the trailer will keep it in place, 10. utilize the brakes. B. closed B But the brakes will hold only as long as there is air pressure in the trailer air tank. You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. Make sure you can hear air escaping with the valve closed. The road is dry and visibility is good. 1/32 to 3/32 of an inch. Doubles and Triples CDL Practice Test - Class A Drivers Allow more following distance. There is no obligation whatsoever. coupled to the rear of a tractor-trailer combination forming a double bottom rig, A coupling device of one or two axles and a sixth wheel by which a semitrailer can be What types of trailers can get stuck on raised crossings? the trailer height is right when: the trailer will be raised slightly when the converter dolly is backed under it. Each trailer and converter dolly has one or more air tanks. There are more things that can go wrong, and doubles/triples are less stable than other commercial vehicles. A Air flows steadily and isentropically through a passage. Learn more and apply here: TruckingTruth was founded by Brett Aquila (that's me! 3. B. pull gently against the pin of the second semitrailer You should keep at least ____ seconds of space ahead of you. 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. 0000008166 00000 n The driver will be required to complete this requirement in three eight hour shifts. Hook dolly to front trailer. PDF Doubles and triples 1. The stopping distance for a tractor trailer There are more critical parts to check when you have two or three trailers. C When checking your air lines, they must be secure and? Which of these statements about quick steering movements and doubles/triples is true? 0000009577 00000 n If you do cross the air lines, supply air will be sent to the service line instead of going to charge the trailer air tanks. On a triple combination, the shutoff valves on the rear of the last trailer should be? Your vehicle is so long that you must swing wide to make the turn. Take special care when pulling two and three trailers. 0000003240 00000 n You have not finished your quiz. mTouch Quiz will automatically populate the fields below. Converter dolly air tank drain valve: CLOSED. When inspecting a converter dolly What should you check for? Did you know you can fill out one quick form here on TruckingTruth and apply to several companies at once for paid CDL training? Take this same test in our other testing modes How to Get a Hazardous Materials Endorsement, What is a CDL? What should you check for when inspecting the converter dolly? All material on this website is copyrighted. How much space should be between the upper and lower fifth wheel? door. The pintle hook? Driving doubles/triples is also more dangerous in hot and cold weather driving, as well as on mountain roads. 0000007487 00000 n The road is dry and visibility is good. 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. hand valve For emergency braking you should: You are doing a walk around inspection of a double or triple trailer rig. It is very important to keep the air supply clean. Good speed management says you should: You must drive through deep or flowing water. Doubles and triples must be driven very smoothly to avoid rollover or jackknife. If you crossed the air lines, you could drive away, but you would not have trailer brakes. Delivering to. 0000003060 00000 n slow to safe speed before entering, then accelerate slightly through the curve. You are doing a walk around inspection of a double or triple trailer you should not, when you turn with the tractor/triple trailer combination the wheels that offtrack(cheat) the most are. unsafe slow down even further, or better yet, find a safe haven and park until the What does the Commercial Driver Handbook say about how much space you should keep ahead of your truck? That there is no space between upper and lower sixth wheel. recouple. You wish to turn right from one two-lane, two-way street to another. 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. Double and triple trailers increase not only the operators risk of safety, but also the other motorists around him. Once you have coupled your rear trailer, you should test the coupling by? 12, 3. 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. . When checking the coupling system, make sure that the locking jaws are around the shank of the. Question 4. You should keep at least ____ seconds of space ahead of you. Only trailers designed to be pulled with another trailer behind it will have a shut off valve. 0000004689 00000 n With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. Air escape from the open valve You are driving with double trailers and must use your brakes to avoid a crash. Should the pintle hook be latched or unlatched when backing a dolly under the second trailer? A major leak in the emergency line will cause the tractor protection valve to close and the trailer emergency brakes to come on. 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? d. protein. We'll help you make the right choices and prepare for a great start to your trucking career. The crack the whip effect will topple the rear trailer first. In normal operation, trailer service brakes should be operated by? B. the emergency line valve open and release air Why is there still destructive interference? S-cam brakes are the most common style brakes on large trucks today. Also, this page requires javascript. if you have traffic on both sides of your vehicle and something is blocking your lane, a move to the right still be best. You may be timed. If the spring brakes do not release when you push the trailer air supply control, check the air line connections. Never unlock the pintle hook with the dolly still under the rear trailer. you can fuck a pornstar craigslist cars and trucks for sale by owner; kd linear actuator kdpt007 what is ait in the army; native american spiritual cleansing prayer simple spectrum coupon code; . fumoto drain valve. 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. _______ should be tested with the hand valve but controlled in normal operation with the foot pedal. Take special care when pulling two and three trailers. When connecting two trailers the converter dolly is connected to the rear trailer first. A When does the Driver's manual say you should disable the steering axle brake? A good and safe driver will always look out for ______. Converter dolly air tank drain valve: CLOSED Air lines supported and glad hands properly connected. How much space should be between the upper and lower fifth wheels? How many different ways of coupling and uncoupling trailer combinations are there? Connect the Converter Dolly to the Rear Trailer: Test the coupling by pulling against the pin of the second semitrailer. The front trailer in a set of double trailers is most likely to turn over due to the Crack-the-Whip effect. 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. A converter dolly is a piece of equipment designed to allow commercial trucks, such as semi-trucks, to pull a trailer. Double and Triples Part 1 Flashcards - flashcardmachine.com However, converter dollies and trailers built before 1975 are not required to have spring brakes. The application only takes one minute. 0000001354 00000 n 21 0 obj << /Linearized 1 /O 23 /H [ 1162 213 ] /L 29759 /E 11109 /N 7 /T 29221 >> endobj xref 21 38 0000000016 00000 n A truckers workspace is a small moving office Read More. Often do not have spring brakes You are driving a tractor with multiple trailers. You should not hear air escaping. 0000003998 00000 n Flashcards - Doubles Tripes Test #4 - FreezingBlue With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. 0000005554 00000 n They are not only longer, but also need more space because they cannot be turned or stopped suddenly. you should check the trailer height before connecting a converter dolly to a second or third trailer. Which the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the trailer. C This has the same value as the %%TOTAL%% Variable on the Final Screen. Which of the following statements about off tracking is true? 1. re-couple, You can if you want to, it does not matter. When you're finished, check your score and results. allow "much more space than is needed for ideal driving conditions". Usually need a glad hand converter Because of this, which of the following vehicle parts is most likely to tip over? DOUBLE/TRIPLE CDL Flashcards | Chegg.com A CDL is required to drive any of the following vehicles: A vehicle with two separate parts - the power unit (tractor) and the trailer. 4. C 9 Questions You Must Ask, Decide if Truck Driving is The Correct Career Path, Do Not Sell or Share My Personal Information. 0000006383 00000 n 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. At section 2 downstream, the speed is 519 m/s. 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. can and will get stuck on a raised railroad crossing. In an application in which vGS=vDS=Vsupply=1.8V,v_{G S}=v_{D S}=V_{\text { supply }}=1.8 \mathrm{V},vGS=vDS=Vsupply=1.8V, a drain current of 2 mA is required of a device of minimum length of 0.18m.0.18 \mu \mathrm{m}.0.18m. the rig will continue moving in a straight line no matter how much the steering wheel is turned. Please visit using a browser with javascript enabled. C. drive through quickly, With the hand valve on, you should test the trailer brakes by opening the service valve line at the rear of the rig. A. use the engine brake or speed retarder Locking jaws open C. slow to a safe speed before entering the curve, then coast through it, Which of these is NOT a good thing to do when driving on slippery roads? The road is dry and visibility is good. Which is most likely to tip over: when testing the coupling of a double trailer the landing gears of the rear trailer should be, you must drive through deep or flowing water . Many scientists are concerned that the melting of Earth's sea ice will increase Earth's surface temperature. The pressure in the service line tells how much pressure the relay valves should send to the trailer brakes. You must steer gently when pulling trailers. A Open, latched B Open, free C Closed, latched D Closed, free 28. Why should you not use the trailer hand valve while driving? 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: All trademarks are property of their respective owners. Trailer Air Tanks And Shutoff Valves - Page 50. you are driving on a slippery road during the day. C. fully raised, Which of these statements about speed management and braking is true? and possible answers include: open, free or closed, latched or closed, free or open, latched from TruckersDouble & Triple Trailer (CDL) Endorsement. Time used (Requires timer add on). Correct answer percentage. dress gifs. 0000005345 00000 n The rear trailer of a triple You should keep at least _____ seconds of space ahead of you. The lightest trailer If a converter dolly is still under the second trailer and you unlock the pintle hook, what will probably happen? 0000002636 00000 n Trailer Parts Superstore - How Air Brakes Work - Eastern Marine which of these figures shows how the turn should be made, if you want to couple a second trailer to your combination vehicle, secure it by, the trailers spring brakes & wheel chocks. Locking jaws closed on Ship to Store. Types of converter dollies. C 4. the road is dry & visibility is good. Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? When you do this, you should hear: None of the above, 2. That there is some space between the upper and lower fifth wheel. Doubles/Triples Endorsement Flashcards | Quizlet A. air escape from the open valve Join 50,000+ users around America to get your Commercial Driver License today! D should remain in the closed position. Email Updates When New Articles Are Posted. B. for doubles and triples, the fifth wheel should be all the way towards the tractor Make sure pintle hook is latched. A vehicle transporting hazardous materials is required to display placards where? A B. do not need to be checked as often as flat mirrors because they show a larger area Go to the rear of the rig. what is likely to happen if the pintle hook is unlocked with the dolly still under the second trailer? 1 The rear trailer does not have shut-off valves. To prevent trailers from rolling over, you must steer gently and go slowly around corners, on ramps, off ramps and curves. Feel Free to add additional fields for the Quiz Taker to complete using the "Add Fields" options to the right. Park on level ground, put chock on the tires, and charge the air tank. The emergency brakes come on whenever the air supply knob is pulled out or the trailer is disconnected. What is likely to happen? What is a converter dolly? Doubles and triples are more likely to turn over than other combination vehicles because of what effect? kingpin, That there is grease between upper and lower fifth wheel. All rights reserved Site Map. A. brake and downshift in a curve during normal operation the brakes of the double/triple trailer are controlled by : which of these will result in the best control on curves? If spare tire is carried on converter gear (dolly), make sure it's secured. Provides a snug fit to eliminate unwanted seepage of air or water. and the converter dolly air tank drain valve should be _____. [California Commercial Driver Handbook] The weight of a truck: Is a major factor affecting stopping distance. A connection device of one axle used to disconnect a semitrailer combination vehicle Shut off valves are only used on trailers designed to be towed in conjunction with other trailers (doubles / triples). 0000001956 00000 n What do you check when making a visual check of coupling? A thorough pre-trip inspection should catch any major service line leaks before you begin your trip. 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? 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. Dobles - Triples Pruebas de prctica 3 - NJ 2023 - CristCDL.com safe speed would be 40 MPH. Check them all. While inspecting your converter dolly coupling, you should make sure there is _____ between the upper and lower fifth wheel. 2023 WV Doubles - Triples CDL Practice Test 1 - CristCDL.com When you're trying to correct a drive-wheel braking skid why should you stop braking? None of the above, 5. Light cords firmly in sockets on trailer. A. for coupled doubles and triples, be sure that the pintle hook is in the open position Hit the article below to see specific information about AOBRDs! You are driving a 100 foot twin trailer combination at 50 mph. A. countersteer When connecting the glad hands, press the two seals together with the couplers at a 90-degree angle to each other. how can you be sure you supplied air to a second trailer? How do you check to make sure trailer height is correct before coupling? Safety should never take second place, so know your stuff! Do converter dollies have spring brakes? you are driving at night and you must dim your headlights for traffic. We wish you the best of luck in your endeavors and are pleased to be of assistance. Older trailers do not have spring brakes. 10 It's a fifth wheel, not a sixth wheel. Florida CDL Handbook | FL CDL Handbook Coupling & Uncoupling for What is the most common foundation brake found on heavy vehicles? A coupling device of one or two axles and a fifth wheel by which a semitrailer can be coupled to the rear of a tractor-trailer combination forming a double bottom rig Should the shut off valves on the rear of the first trailer be open or closed on a set of double trailers? Which of the following will probably happen if you are driving a double rig and a set of trailer wheels goes into a skid? When uncoupling doubles or triples, what is important to know about unlocking the pintle hook? Locking jaws closed on You should check the height of the trailer before connecting a converter dolly to a second or third trailer. Open Flashcards - Doubles Triples Test #3 - FreezingBlue 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 _______. A. you can steer more quickly and safely if you hold the wheel with one hand Tips for Backing Up a Trailer Like a Pro Trucker. Which of these is the correct answer? Some large trucks have curved (convex or spot) mirrors. c. iron NPT thumbscrew style design enables easy installation. cQ 220rd8bihuM#Om>G*Lz)g^\l9'A9/omf|b49U[@%jGT-QR6i. A. open 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? Doubles and triples must be driven very smoothly to avoid rollover or jackknife. The lighter trailer should be in the rear. B. slow to a safe speed before entering the curve, then accelerate slightly through it D Our normal business hours are Monday-Friday 8 a.m. to 5 p.m. (Pacific Time). The Home Depot Logo You must steer gently when pulling trailers. You are driving a triple trailer and there is a loss of air pressure in the emergency line. Converter dollies: This has the same value as the %%SCORE%% Variable on the Final Screen. ), a 15 year truck driving veteran, in January 2007. You are doing a walk around inspection of a double or triple trailer rig. 0000002446 00000 n What's a converter dolly? How do you check to make sure the trailer height is correct before coupling? How can you test that air flows to all trailers? That split second that you release the brakes will allow them to match the vehicles road 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.