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The pressure in the service line tells how much pressure the relay valves should send to the trailer brakes. Compressed air usually has some water and some compressor oil in it. A-dolly. For all brakes to work on a triple combination, you must have air supply? If your converter dolly has to be moved over a distance to bring it to your semitrailer, you should? D Allow much more space than is needed for ideal driving condition. 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. You need to brake in order to regain control. How can you test that air flows to all trailers? Check them all. For emergency braking you should: You are doing a walk around inspection of a double or triple trailer rig. Hit the article below to see specific information about AOBRDs! C. fully raised, Which of these statements about speed management and braking is true? How do you check to make sure trailer height is correct before coupling? The converter dolly air tank drain valve on coupled double/triple Mar 2 - Mar 3. If there is Dont hesitate to take advantage of our practice tests in each category specific to your needs. Ideal for replacing a worn, leaky drain valve on a compressor. A. hand valve Doubles and triples must be driven very smoothly to avoid rollover or jacknife. The emergency brakes come on whenever air pressure in the emergency line is lost. 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. 5. You must stop, yield to traffic and pedestrians, and only proceed when safe. Park the rear trailer against another trailer, chock the tires and lock the trailer What is likely to happen? Did you know you can fill out one quick form here on TruckingTruth and apply to several companies at once for paid CDL training? 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. How many different ways of coupling and uncoupling trailer combinations are there? The crack the whip effect that troubles trucks with trailers. Ensuring the safety of the public starts with a thorough C 0000006836 00000 n . Doubles Triples Endorsement Test Flashcards | Quizlet and ensuring it is secure. It is important not to let water and oil build up in the air tanks. 0000006015 00000 n C Take this same test in our other testing modes How to Get a Hazardous Materials Endorsement, What is a CDL? Therefor, if there is a major leak in your service line, you may not know it until you try to use the service brake. the fifth wheel, so trailer is raised slightly when dolly is pushed under it. How should the converter dolly air tank drain valve on coupled double can and will get stuck on a raised railroad crossing. kingpin, That there is grease between upper and lower fifth wheel. Converter dollies have spring brakes. 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. It's a fifth wheel, not a sixth wheel. Make sure to visually inspect the fifth wheel and that the locking mechanism is Which of these is NOT a good thing to do when driving on slippery roads? Pintle hook latched. You should be sure the converter dolly air tank drain valves are _____ and the pintle hook is _____. You are visually checking the coupling of a converter dolly to the rear trailer. 3. The pintle hook should always be secure when the vehicle is in motion. you are visually checking the coupling of a converter dolly to the rear trailer. 0000007487 00000 n Help your friends discover what it takes to become a successful truck driver. 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 . The rear trailer of a double PDF Doubles and triples 1. The stopping distance for a tractor trailer Join 50,000+ users around America to get your Commercial Driver License today! Any vehicle required by federal regulations to be placarded while transporting hazardous materials. Visually check to make sure that the lead trailer is slightly higher than the center of Air valves should be closed on all trailers, Air valves should be open on all trailers, Rear of front trailers: closed, rear of last trailer: open, Rear of front trailers: open, rear of last trailer: closed. If you leave this page, your progress will be lost. A. brake and downshift in a curve Only trailers designed to be pulled with another trailer behind it will have a shut off valve. A dolly should be pulled out from a rear trailer using? recouple. B 0000008915 00000 n 9 Converter dolly air tank drain valve: CLOSED. It depends on the load King pin. It is important to check the height of the trailer before connecting a converter dolly to a trailer. 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. blood We wish you the best of luck in your endeavors and are pleased to be of assistance. 60607. A green traffic light allows the driver to go. When driving with more than one trailer, which trailer should be the first one behind the tractor? If there are no dummy couplers, the glad hands can sometimes be locked together (depending on the couplings). 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. Never, 9. securely fastened. You can find it here: High Road 2.0. 3. doubles/triples flip flop over from quick steering movements more easily than many other vehicles. 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. 0000001775 00000 n B. you need about four times as much stopping distance at 40 mph as at 20 mph Take special care when pulling two and three trailers. cQ 220rd8bihuM#Om>G*Lz)g^\l9'A9/omf|b49U[@%jGT-QR6i. With the red knob pushed in on the tractor dash, the service line should have air in it. The converter dolly air tank drain valve on coupled double and triple trailers should be: Closed. 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. Doubles/Triples Air Brake Check - digital.ncdcr.gov 7.3 Inspecting Doubles and Triples = Additional Things to Check During a Walkaround Inspection. A) one inch of space . Locking jaws closed on Nothing, the weight of the trailer will keep it in place, 10. This has the same value as the %%TIME_ALLOWED%% Variable on the Final Screen. 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. Sometimes, metal tags are attached to the lines with the words service and emergency stamped on them. You must steer gently when pulling trailers. Chock the tires, park on level ground and charge the trailer air tank if it does Time limit varies by state. The word part ferrit- means: You want to lock your combination to a second trailer that has no spring brakes. If spare tire is on converter gear (dolly), make sure it is secured. Which diagram shows the best way to turn? On a triple combination, the shutoff valves on the rear of the last trailer should be? 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. Closed, free, 8. Which of the following is true about loading cargo into double or triple trailers? Amazon.com: Air Tank Drain Valve Each trailer and converter dolly has one or more air tanks. These valves permit closing the air lines off when another trailer is not being towed. Doubles and Triples CDL Practice Test - Class A Drivers When you do this, you should hear: Do converter dollies have spring brakes? The driver must yield the right-of-way to other vehicles when merging and when entering a highway from an alley. the trailer height is right when: the trailer will be raised slightly when the converter dolly is backed under it. You may be timed. Explore now! A thorough pre-trip inspection should catch any major service line leaks before you begin your trip. You should be sure the converter dolly air tank drain . A full trailer behind a truck Trailer Air Tanks And Shutoff Valves - TruckingTruth When driving a double or triple trailer, greater care must be given to. [California Commercial Driver Handbook] The weight of a truck: Is a major factor affecting stopping distance. You will have greater length and more dead axles to pull with your drive axles than other drivers. the crack-whip effect that triubkes trucks with trailers is most likely to cause a tip over when. All trademarks are property of their respective owners. True! 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. 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. You are doing a walk around inspection of a double or triple trailer rig. When checking the fifth wheel, you should make sure that it has enough? The couplers have a rubber seal that prevents air from escaping. Before coupling a trailer, you should make sure it is at the right height using? The heavier trailer should be in the rear. The last trailer in a combination is most likely to turn over. True! Definition. Doubles and triples are extremely prone to control issues and must be When the road is dry Light cords firmly in sockets on trailer. With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. TestPermit.com is not affiliated, endorsed, or sponsored by state agencies or any motor vehicle and any other departments in the United States, Canada, UK. To do this without wheel chocks you should: Empty trucks: When parking your double or triple combination, you should look for a parking space What does the drivers manual say about how much space you should keep ahead of your truck? C. closed; unlatched, Which of these will result in the best control on a curve? 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Which of the following statements about off tracking is true? Delivering to. front of the second trailer. 2003-2023 Chegg Inc. All rights reserved. mTouch Quiz will automatically populate the fields below. Provides a snug fit to eliminate unwanted seepage of air or water. When checking your air lines, they must be secure and? If the fifth wheel on a coupling is too far forward, the tractor frame may hit? When coupling, be sure to couple the proper glad hands together. How can you be sure you supplied air to a second trailer? B. pull gently against the pin of the second semitrailer You can also reach us at (888) 830-2326. If one air system is very low on pressure _______. 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. B. use only the trailer brakes 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. The converter dolly air tank drain valve on coupled double/triple trailers should be: Answer: Closed. What happens when there is a major leak in the emergency air line? 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. Flashcards - Doubles Tripes Test #4 - FreezingBlue Doubles and triples must be driven very smoothly to avoid rollover or jackknife. 0000003060 00000 n How To Use Cruise Control Effectively As A Truck Driver. Trailer Parts Superstore - How Air Brakes Work - Eastern Marine Otherwise, the dolly tow bar may fly up, possibly causing injury and making it very difficult to re-couple. Double and Triples Endorsement Flashcards 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. weather passes. Calculate the voltage gain of each. None of the above, 4. What should you check for when inspecting a converter dolly - Answers A. closed; latched Contributor: Luke Nold (Experienced truck driver for 5+ years and published writer for Fleet Magazine). For emergency braking you should: A driver of a vehicle with double or triple trailers will have greater length and more dead axles to pull, increasing the likelihood of a wreck. fumoto drain valve. 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. Slow to a safe speed before entering the curve, then coast through the curve. The emergency brakes come on whenever the air supply knob is pulled out or the trailer is disconnected. When uncoupling the converter dolly Why should you never unhook the 1/3 For example: If you are traveling 60 MPH and it begins to rain, your suggested 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 application only takes one minute. The final procedure when connecting a rear trailer is to? Each trailer and converter dolly has one or more air tanks. With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. The pintle hook? This will prevent water and dirt from getting into the coupler and the air lines. To check that the trailer emergency brakes are working properly, you should pull out the trailer air supply control and? Park on level ground, put chock on the tires, and charge the air tank. C For emergency braking you should: May have poor traction due to bouncing and wheels lockup. 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? The number and size of air tanks varies among vehicles. For emergency braking you should: Use controlled or stab braking Converter dollies: Often do not have spring brakes The crack the whip effect that troubles trucks with trailers. Each tank has a drain valve on it, and you should drain each tank every day. On double and triple combinations, you must make sure that which of these is secure? Your vehicle is so long that you must swing wide to make the turn. 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