60607. The dolly tow bar may fly up, possibly causing injury, and making it very difficult to What should you check for when inspecting the converter dolly and the pintle hook? 0000010306 00000 n On a triple combination, the shutoff valves on the rear of the last trailer should be? will have a lamp on the drivers side. unsafe slow down even further, or better yet, find a safe haven and park until the Air escape from the open valve You are driving with double trailers and must use your brakes to avoid a crash. 9. If your tractor protection valve doesn't work properly, then if an air hose starts to leak what could happen? Contributor: Luke Nold (Experienced truck driver for 5+ years and published writer for Fleet Magazine). Visually check to make sure that the lead trailer is slightly higher than the center of Remember, the service line is not used unless you depress the brake pedal or use the trailer hand valve. TestPermit.com provides free unofficial review materials for a variety of exams. At section 1, where the cross-sectional area is 0.02 m2m^{2}m2, the air is at 40.0 kPa (abs), 60C60^{\circ} \mathrm{C}60C, and M=2.0. 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. When you do this, you should hear: you are driving with double trailer and must use your brakes to avoid a crash. "Glad hands" are coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer. Each trailer and converter dolly has one or more air tanks. The converter dolly air tank drain valve on coupled double/triple trailers should be: Closed. 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). All trademarks are property of their respective owners. Those that do not have spring brakes have emergency brakes that work from the air stored in the trailer air tank. B Open, free The road is dry and visibility is good. In order to receive your Doubles and Triples endorsement, it is required that you pass the state's official CDL written Knowledge exam. These mirrors: A green traffic light allows the driver to go. 0000001162 00000 n These valves permit closing the air lines off when another trailer is not being towed. Open. Otherwise, the dolly tow bar may fly up, possibly causing injury and making it very difficult to re-couple. C. fully raised, Which of these statements about speed management and braking is true? View the price and details of this FINSBURY PUMP SYSTEMS 400L (SINGLE STAGE) 5.5HP HONDA GX PETROL ENGINE (18M HOSE) FIRE WATER TANK | Mobile fire units. Never unlock the pintle hook with the dolly still under the rear trailer. The service brakes slowly move to the fully applied position You will not be tested on uncoupling twins unless you want to get a double/triple trailer endorsement on your license. They provide the air pressure used to operate trailer brakes. Hit the article to see the way to back up your trailer like a pro! Pull gently against the pin of the second trailer. Please visit using a browser with javascript enabled. How do you check to make sure trailer height is correct before coupling? ADVERTISEMENT ADVERTISEMENT Clean the couplers and rubber seals before a connection is made. To check air flows to all trailers, you should let air pressure reach normal then? Delivering to. What value of channel width must the design use? How can you test that air flows to all trailers? What happens if you cross the Emergency Air Line and the Service Air Line? The road is dry and the visibility is good. For emergency braking you should: which of these statements about emergency steering is true? Definition. To do this without wheels chocks you should: Supply air to the trailer air system with the tractor and then disconnect the emergency line. We wish you the best of luck in your endeavors and are pleased to be of assistance. B A. completely open A safe speed on a curve for a straight truck or a single trailer combination vehicle may be too fast for a set of doubles or triples. The road is dry and visibility is good. B. for doubles and triples, the fifth wheel should be all the way towards the tractor 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 should keep at least ____ seconds of space ahead of you. If the spring brakes do not release when you push the trailer air supply control, check the air line connections. Any trailer, 7. Close the emergency line shut-off valve at the rear of the trailer. Each trailer and converter dolly has one or more air tanks. 1 This will prevent water and dirt from getting into the coupler and the air lines. B. use only the trailer brakes This has the same value as the %%PERCENTAGE%% Variable on the Final Screen. A. allow "much more space" than is needed for ideal driving conditions The converter dolly air tank drain valve on coupled double and triple trailers should be: Closed. B. closed The converter dolly is an auxiliary axle with a coupling device. King pin. In this order, the shutoff valves at the rear of front trailers, the rear of the last trailer and the converter dolly air tank drain valve should be? It is extremely unlikely you will drive a trailer built before 1975, but for the written exam, you still may need to know that trailers built before 1975 were not required to have spring brakes. If this activity does not load, try refreshing your browser. In the coupling system, the locking jaws should be fixed around? Double and triple trailers increase not only the operators risk of safety, but also the other motorists around him. With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. The front trailer in a set of double trailers is most likely to turn over due to the Crack-the-Whip effect. B. open; latched For emergency braking you should: A. open Your vehicle is so long that you must swing wide to make the turn. It depends on the load to do this without wheel chocks you should: supply air to the trailer air system with the tractor and then disconnect the emergency line. The trailer height is right when: The trailer will be raised slightly when the converter dolly is backed under it. how can you be sure you supplied air to a second trailer? A. make things look smaller and farther away than they really are Make sure pintle hook is latched. None of the above, 2. Always test the trailer brakes before driving with the hand valve or by pulling the air supply (tractor protection valve) control. A Commercial Drivers License Overview, Trucking Terminology and Transportation Definitions. Which of these is NOT a good thing to do when driving on slippery roads? A This would be very dangerous. Seriously! What is one function of the tractor protection valve? D Make sure you have large enough gaps before entering or crossing traffic. B. pull gently against the pin of the second semitrailer You should reduce your speed by about _____ on a wet road. A major leak in the emergency line will cause the tractor protection valve to close and the trailer emergency brakes to come on. slow to safe speed before entering, then accelerate slightly through the curve. 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. You should NOT: The driver must yield the right-of-way to other vehicles when merging and when entering a highway from an alley. weather passes. 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 Open the emergency line shut-off valve at the rear of the last trailer. Any trailer with a reduced ground clearance The couplers have a rubber seal that prevents air from escaping. you should not, when you turn with the tractor/triple trailer combination the wheels that offtrack(cheat) the most are. You MUST have air all the way to the back for all the brakes to work. Make a sketch that explains this phenomenon in terms of a feedback loop . A. closed; latched None of the above, 5. You must steer gently when pulling trailers. The pressure in the service line tells how much pressure the relay valves should send to the trailer brakes. None of the above, 4. Each trailer and converter dolly has one or more air tanks. 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. B. slightly open Stop the vehicle by gearing down and sparingly You should not hear air escaping. What three methods can you use to secure a second trailer before coupling? Closed, latched True! Number of wrong answers. Their drawbars differentiate them. you are driving at night and you must dim your headlights for traffic. When uncoupling a rear trailer, your rig should be parked in a straight line on? To uncouple the rear trailer in a set of doubles, the shut-off valve at the rear of the front trailer should be: Closed. 0000005664 00000 n you are doing a walkaround inspection of a double or triple trailer rig. It is important to check the height of the trailer before connecting a converter dolly to a trailer. 5. You should hear air escaping, showing the entire system is charged. Make sure trailer height is correct. Which of these are the correct positions for shut-off valves in doubles and triples? When the road is slippery Open the emergency line shut-off valve at the rear of the last trailer. The road is dry and visibility is good. These dollies will have a yellow lamp on the left side of the dolly Questions You Should Know For Doubles And Triples 1. The trailer height is right when: The trailer will be raised slightly when the converter dolly is backed under it. What happens when there is a major leak in the emergency air line? D Flammable materials in the front trailer then it must have the placards on that trailer. C. 3, You are doing a walk around inspection of a double or triple trailer rig. Tips for Backing Up a Trailer Like a Pro Trucker. and ensuring it is secure. 0000008166 00000 n 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. 0000001375 00000 n A. air escape from the open valve 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. Also, this page requires javascript. A) one inch of space . The dolly tow bar may fly away, possibly causing panic, and making it very difficult
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