NPT thumbscrew style design enables easy installation. fifth wheel, so trailer is raised slightly when dolly is pushed under it. Always unlock the pintle hook with the dolly still under the rear trailer. D You are visually checking the coupling of a converter dolly to the rear trailer. Why is there still destructive interference? The driver will be required to complete this requirement in three eight hour shifts. Flammable materials in the front trailer then it must have the placards on that trailer. Because of this, which of the following vehicle parts is most likely to tip over? Please use the form below to contact our customer service or sales team. allow "much more space than is needed for ideal driving conditions". The dolly tow bar may fly up, possibly causing injury, and making it very difficult to 1/32 to 3/32 of an inch. Closed, free, 8. It depends on the load Feel Free to add additional fields for the Quiz Taker to complete using the "Add Fields" options to the right. Related Question Question: What does this sign mean? 9. A. the total stopping distance of a truck is the distance it takes to stop once the brakes are put on at any speed The road is dry and visibility is good. You are visually checking the coupling of a converter dolly to the rear trailer. The crack the whip effect that troubles trucks with trailers. you should avoid traveling next to others when possible. Air pressure is sent from the air tanks to the brakes by relay valves. More driving knowledge, questions and answers, online practice tests for obtaining a drivers . 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? 11 During normal operation the brakes of the double/triple trailer are controlled by: 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. 0000008915 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. 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. 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. which of these statements about managing space to the sides is true? You can find it here: High Road 2.0. B The couplers have a rubber seal that prevents air from escaping. These valves permit closing the air lines off when another trailer is not being towed. Ensuring the safety of the public starts with a thorough inspection of all equipment. For emergency braking you should: May have poor traction due to bouncing and wheels lockup. The total number of questions. B Allow more following distance. A A major leak in the emergency line will cause the tractor protection valve to close and the trailer emergency brakes to come on. Question 4. 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. a sudden movement with the steering wheel can result in a tipped over rear trailer, you wish to turn right from one two-lane, two-way street to another. Submit your email at the end of the test. cQ 220rd8bihuM#Om>G*Lz)g^\l9'A9/omf|b49U[@%jGT-QR6i. When you do this, you should hear: you are driving with double trailer and must use your brakes to avoid a crash. 1 Which of the following will occur? If this lamp is illuminated and does not go out, This will let the rear wheels roll again and keep the rear wheels from sliding. weather passes. D Release Dolly breaks by opening the air tank petcock or if the dolly has a spring break, use the Dolly parking brake control . Once that's complete, then its an easy push back and the When driving doubles or triples how should they be driven to avoid rollover or jackknifing: C If spare tire is on converter gear (dolly), make sure it is secured. The pressure in the service line is controlled by the brake pedal and the trailer hand brake. 0000004668 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. Open the emergency line shut-off valve at the rear of the last trailer. When you're finished, check your score and results. What three methods can you use to secure a second trailer before coupling? A. use light, steady pressure on the brake pedal you should not, when you turn with the tractor/triple trailer combination the wheels that offtrack(cheat) the most are. Each trailer and converter dolly has one or more air tanks. Shut-off valves (at rear of trailers, in service and emergency lines): When pulling doubles or triples, what is important to know about the order of the trailers? 0000002446 00000 n How To Use Cruise Control Effectively As A Truck Driver. 1. If you crossed the air lines, you could drive away, but you would not have trailer brakes. You will not be tested on uncoupling twins unless you want to get a double/triple trailer endorsement on your license. should remain in the closed position. C Usually need a glad hand converter The road is dry and visibility is good. Locking jaws open 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). They provide the air pressure used to operate trailer brakes. You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. When uncoupling a rear trailer, your rig should be parked in a straight line on? If you feel A. you can steer more quickly and safely if you hold the wheel with one hand You should check the height of the trailer before connecting a converter dolly to a second or third trailer. Open, latched Clean the couplers and rubber seals before a connection is made. You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. None of the above, 5. Which of the following will probably happen if you are driving a double rig and a set of trailer wheels goes into a skid? You must steer gently when pulling trailers. D 0000001775 00000 n A. make things look smaller and farther away than they really are how can you be sure you supplied air to a second trailer? Opening the shut off valves on the rear most trailer will ensure the lines are flowing Should the shut off valves on the rear of the first trailer be open or closed on a set of double trailers? Do converter dollies have spring brakes? It is important not to let water and oil build up in the air tanks. Charge the system and pump the brakes with the window down. Never, 9. S-cam brakes are the most common style brakes on large trucks today. You may be timed. C C. always keep your vehicle to the left side of your lane, When testing the coupling of double trailers, the landing gear of the rear trailer should be: 0000001375 00000 n 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. A Open, latched B Open, free C Closed, latched D Closed, free 28. You should reduce your speed by about _____ on a wet road. 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. Often do not have spring brakes If a converter dolly is still under the second trailer and you unlock the pintle hook, what will probably happen? You should NOT: You are driving a set of doubles and a set of trailer wheels goes into a skid. B. you can almost always stop more quickly than you can turn b. cell C. fully raised, Which of these statements about speed management and braking is true? Disconnect the glad-hand at the front of the first trailer and listen for air flow. A. always keep your vehicle to the right side of your lane When coupling, be sure to couple the proper glad hands together. The dolly tow bar may fly up 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. Time allowed (Requires timer add on). 1/2 to 3/4 of an inch 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; . Park on level ground, put chock on the tires, and charge the air tank. How do you know if your converter dolly is equipped with antilock brakes? Locking jaws closed on The heavier trailer should be in the rear. 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 When uncoupling doubles or triples, what is important to know about unlocking the pintle hook? Otherwise, the dolly tow bar may fly up, possibly causing injury and making it very difficult to re-couple. Also, this page requires javascript. Any time you have to A connection device of one axle used to disconnect a semitrailer combination vehicle Slow to the safe speed before entering, then accelerate slightly through the curve. You are driving a tractor with multiple trailers. 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. 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. You need to brake in order to regain control. Doubles and triples must be driven very smoothly to avoid rollover or jackknife. That split second that you release the brakes will allow them to match the vehicles road You want to lock your combination to a second trailer that has no spring brakes. The dolly tow bar may fly up, possibly causing injury and making it very difficult to re-couple. 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? When turning a double or triple at an intersection, the turn often cannot be completed without swinging wide. If spare tire is carried on converter gear (dolly), make sure it's secured. Use only the trailer brakes 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. When checking the coupling system, make sure that the locking jaws are around the shank of the. You are driving a 100-feet truck with double trailers at 50 mph. Park the rear trailer against another trailer, chock the tires and lock the trailer That there is no space between upper and lower sixth wheel. There are more things that can go wrong, and doubles/triples are less stable than other commercial vehicles. the crack-whip effect that triubkes trucks with trailers is most likely to cause a tip over when. A major leak in the emergency line will cause the tractor protection valve to close and the trailer emergency brakes to come on. rear trailer. Pintle hook latched. For emergency braking you should: which of these statements about emergency steering is true? Follow the procedures described later in this section. Describe what the trailer air supply control does. Therefor, if there is a major leak in your service line, you may not know it until you try to use the service brake. What should you check for when inspecting the converter dolly? None Our business address is: Attn: Class A Drivers MH Sub I, LLC dba Internet Brands 909 N Pacific Coast Highway, 11th Floor El Segundo, CA 90245. The topics with which you will want to be expertly familiar are: There isnt as much information to be studied in the classroom or in the CDL manual regarding doubles and triples, so in-lot and on-the-road practice will help you pass this test. B. slightly open dress gifs. 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. A. completely open with the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the trailer. Before you can supply air to the air tanks of a second trailer you need to. They provide the air pressure used to operate trailer brakes. C. foot pedal, Which of these statements about managing space to the sides is true? 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? Air flows steadily and isentropically through a passage. Never unlock the pintle hook with the dolly still under the rear trailer. Which is most likely to tip over: The number and size of air tanks varies among vehicles. This has the same value as the %%TOTAL%% Variable on the Final Screen. Each trailer and converter dolly has one or more air tanks. 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. Any vehicle required by federal regulations to be placarded while transporting hazardous materials. can and will get stuck on a raised railroad crossing. These trailers have no parking brake. 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. This will prevent water and dirt from getting into the coupler and the air lines. B By clicking on "Sign Up", you agree to our Terms of Use and Privacy Policy. Correct answer percentage. There is no obligation whatsoever. Slow to the safe speed before entering, then accelerate slightly through the curve. Hit the article below to see specific information about AOBRDs! 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. When you are pulling trailers, which of the following statements is true about steering? You wish to turn right from one two-lane, two-way street to another. 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 You should keep at least _____ seconds of space ahead of you. 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. 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. 0000001956 00000 n paramount to safe driving. The shut off valves prevent air from going any further. Take special care when pulling two and three trailers. 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. Use the engine brake or speed retarder. This has the same value as the %%TIME_USED%% Variable on the Final Screen. 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. inspection of all equipment. The driver must yield the right-of-way to other vehicles when merging and when entering a highway from an alley. Shut off valves are only used on trailers designed to be towed in conjunction with other trailers (doubles / triples). While doing a walkaround inspection of a double or triple, the converter dolly air tank drain valve should be _____, and the pintle hook should be _____. All other trailer air functions use the emergency line. C Ship to Store. 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: 0000003998 00000 n Do converter dollies have spring brakes? How much space should be between the upper and lower fifth wheels? You are driving with double trailers and must use your brakes to avoid a crash. to do this without wheel chocks you should: supply air to the trailer air system with the tractor and then disconnect the emergency line. 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 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 _______. We've all wondered if the adventure and challenges of life on the open road would suit us better than the ordinary day to day lives we've always known. You should keep at least ____ seconds of space ahead of you. Allow much more space than is needed for ideal driving condition. The crack the whip effect will topple the rear trailer first. When uncoupling a rear trailer, you should remove some weight from the dolly by? The application only takes one minute. securely fastened. How can you test that air flows to all trailers? 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. 3. That there is some space between the upper and lower fifth wheel. 2 None of the above, 4. You are doing a walk around inspection of a double or triple trailer rig. All material on this website is copyrighted. All rights reserved Site Map. You should not hear air escaping. The service brakes slowly move to the fully applied position A 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. You should keep at least ____ seconds of space ahead of you. You shouldn't stop braking. 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: