Correct answer percentage. the rig will continue moving in a straight line no matter how much the steering wheel is turned. The couplers have a rubber seal that prevents air from escaping. Why is there still destructive interference? For emergency braking you should: May have poor traction due to bouncing and wheels lockup. B. you need about four times as much stopping distance at 40 mph as at 20 mph Closed, free, 8. You are doing a walk around inspection of a double or triple trailer rig. D Which f these will result in the best control on curves? A Commercial Drivers License Overview, Trucking Terminology and Transportation Definitions. A) closed . 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 should keep atleast __seconds of space ahead of you. Doubles and Triples CDL Practice Test - Class A Drivers A Usually need a glad hand converter When you go to the rear of the last trailer, what should you do to complete this check? To prevent trailers from rolling over, you must steer gently and go slowly around corners, on ramps, off ramps and curves. The pressure in the service line is controlled by the brake pedal and the trailer hand brake. A. fully lowered symptoms of a bad fuel tank selector switch. Remember however, that is just a suggestion. The rear trailers shut off valves should be closed and the front open to allow air to the PDF Section 7: Doubles and Triples - CDL Study 0000001162 00000 n Doubles/Triples Endorsement Flashcards | Quizlet Double/Triple Flashcards | Quizlet you want to hook your combination to a second trailer that has no spring brakes. A. require shorter stopping distances than full ones When you do this, you should hear: you are driving with double trailer and must use your brakes to avoid a crash. A. always keep your vehicle to the right side of your lane 0000003240 00000 n They are filled by the emergency (supply) line from the tractor. Did you know you can fill out one quick form here on TruckingTruth and apply to several companies at once for paid CDL training? B. use only the trailer brakes Slow to the safe speed before entering, then accelerate slightly through the curve. The trailer brakes will unlock Use controlled or stab braking "Glad hands" are coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer. 0000003261 00000 n Dont hesitate to take advantage of our practice tests in each category specific to your needs. There are two types of converter dollies. You are driving a 100 ft twin trailer combination at 50 mph. d. protein. Contributor: Luke Nold (Experienced truck driver for 5+ years and published writer for Fleet Magazine). You are driving with double trailers and must use your brakes to avoid a crash. However there are some states that allow doubles that are each 48 feet in length. The shut off valves, when in the open position, allows air to flow out to another trailer. Should the pintle hook be latched or unlatched when backing a dolly under the second trailer? 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: You must stop, yield to traffic and pedestrians, and only proceed when safe. At TruckingTruth we'll help you decide if trucking is right for you and help you get your career off to a great start. That there is some space between the upper and lower fifth wheel. When coupling, be sure to couple the proper glad hands together. Therefor, if there is a major leak in your service line, you may not know it until you try to use the service brake. c. iron 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). Pull gently against them in a low gear to make sure the brakes work. second trailer will be connected, The dolly will have a yellow lamp on the left side, The dolly will have a yellow lamp on the right side, The dolly will have a red lamp on the left side, The dolly will have a red lamp on the right side. Doubles and triples are more likely to turn over than other combination vehicles because of the "crack- the-whip" effect. If you have traffic on both sides of your vehicle and something is blocking your lane, a move to the right still be best. B. slow to a safe speed before entering the curve, then accelerate slightly through it axle will have spring brakes due to the weight of the unit. Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? This would be very dangerous. When does the "driver's manual" advise disconnecting the steering axle brakes to help keep the rig straight? D Each trailer and converter dolly has one or more air tanks. 0000008915 00000 n Study section 6.2 if you can't answer all of these questions. Older trailers do not have spring brakes. 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 _______. When you do this, you should hear: Ais escape from the open valve. Doubles and triples take up more space than other commercial vehicles. Related Question Question: What does this sign mean? These dollies will have a yellow lamp on the left side of the dolly. Visually check to make sure that the rear trailer is slightly lower than the center of the Eventually, the air will leak away, and then there will be no brakes. CDL License Requirements State By State. You want to lock your combination to a second trailer that has no spring brakes. 1 Use the dummy couplers when the air lines are not connected to a trailer. CDL Doubles and Triples Test Question and Answers 2023 [PDF]: Commercial Drivers License Doubles and Triples Endorsements Knowledge Test. This will supply air to the emergency (supply) lines. A The braking systems of double and triple trailers are different than those of straight trucks because doubles and triples. Converter dolly air tank drain valve: CLOSED Air lines supported and glad hands properly connected. Park the rear trailer against another trailer, chock the tires and lock the trailer Time used (Requires timer add on). Why should you use chocks when parking a trailer without spring brakes? This is CDL Doubles and Triples Test 3in our original Classic Mode. Visually check to make sure that the lead trailer is slightly higher than the center of The service brakes slowly move to the fully applied position Only a certified diesel mechanic can check this. 0000005345 00000 n We are an independent company focused on providing valuable motor vehicle and permit practice test information. Should the shut-off valves on the trailers be open or closed on a set of double trailers? to re-capture it. To uncouple the rear trailer in a set of doubles, the shut-off valve at the rear of the front trailer should be: Closed. 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. safe speed would be 40 MPH. Air pressure is sent from the air tanks to the brakes by relay valves. 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: Always test the trailer brakes before driving with the hand valve or by pulling the air supply (tractor protection valve) control. You should NOT: You are driving a set of doubles and a set of trailer wheels goes into a skid. Any time you have to A vehicle transporting hazardous materials is required to display placards where? Newer trailers have spring brakes just like trucks and truck tractors. A major leak in the emergency line will cause the tractor protection valve to close and the trailer emergency brakes to come on. In a certain electronic device, a three-stage amplifier is desired, whose overall voltage gain is 42 dB. This will let the rear wheels roll again and keep the rear wheels from sliding. Watch the wording of the question AND the answers A safe driver will look for all of the above. Email Updates When New Articles Are Posted. How do you check to make sure trailer height is correct before coupling? 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? How can you test that air flows to all trailers? 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. Secure converter gear support in raised position. In normal operation, trailer service brakes should be operated by? Hb```f``b`c``e@ (Q6_* Page 1 - Doubles/Triples Test Study Guide for the CDL converting it into two trailers, A coupling device of three or four axles and a fifth wheel by which a semitrailer can [California Commercial Driver Handbook] The weight of a truck: Is a major factor affecting stopping distance. You need to be aware of how parking lots are arranged in order to avoid a long and difficult escape. Converter dolly air tank drain valve: CLOSED. 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. Connect Converter Dolly to Rear Trailer Make sure trailer brakes are locked and/or wheels chocked. This will prevent water and dirt from getting into the coupler and the air lines. Those that do not have spring brakes have emergency brakes that work from the air stored in the trailer air tank. The converter dolly is an auxiliary axle with a coupling device. Pickup at South Loop. Any trailer with a reduced ground clearance The trailer is at the correct height when. B. closed coupled to the rear of a tractor-trailer combination forming a double bottom rig, Careful of the wording! 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. and the converter dolly air tank drain valve should be _____. Any single vehicle with a GVWR of 26,001 or more pounds, or any such vehicle towing another not in excess of 10,000 pounds. What three methods can you use to secure a second trailer before coupling? When you are pulling trailers, which of the following statements is true about steering? When testing trailer service brakes, you should use? paramount to safe driving. Converter dollies have spring brakes. What's a converter dolly? Which the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the trailer. You are driving with more than one trailer. Go to the rear of the rig. Any trailer, 7. A thorough pre-trip inspection should catch any major service line leaks before you begin your trip. The Doubles and Triples written CDL Exam is required for your doubles and triples endorsement. Any vehicle required by federal regulations to be placarded while transporting hazardous materials. All other trailer air functions use the emergency line. Becoming A Truck Driver is a dream we've all pondered at some point in our lives. A. air escape from the open valve Feel Free to add additional fields for the Quiz Taker to complete using the "Add Fields" options to the right. When uncoupling, you should never unlock the _______ with the dolly still under the rear trailer. Should the converter dolly air-tank drain valve be open or closed on a double trailer combination? the converter dolly air tank drain valve on couple double/triple trailers should be: to check if the converter dolly is securely coupled to the rear trailer you should: pull gently against the pin of the second trailer. Lock pintle hook. The air lines will rupture C 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 A. hand valve The lighter trailer should be in the rear. Types of converter dollies. The pressure in the service line tells how much pressure the relay valves should send to the trailer brakes. This has the same value as the %%PERCENTAGE%% Variable on the Final Screen. A. opening the air tank petcock 0000010285 00000 n The rear trailers shut-off valves should be closed and the front open. 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. B. slightly open They are filled by the emergency (supply) line from the tractor. More driving knowledge, questions and answers, online practice tests for obtaining a drivers . To test the tractor protection valve, charge the trailer air brake system, turn off the engine, and These trailers have no parking brake. True! 4. 2022 DE Doubles - Triples CDL Quick Review 1 - CristCDL.com 60607. You shouldn't stop braking. While inspecting your converter dolly coupling, you should make sure there is _______ between the upper and lower fifth wheel. You should NOT: The application only takes one minute. Make a sketch that explains this phenomenon in terms of a feedback loop . To do this without wheel chocks you should: Empty trucks: When parking your double or triple combination, you should look for a parking space open the shut-off valves at the rear of the first trailer and close the shut-off valves at the rear of the second trailer, enclose converter dolly air tank drain valves . When uncoupling a rear trailer, you should remove some weight from the dolly by? 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. How do you know if your converter dolly is equipped with antilock brakes? Then, the air loss from the leak will lower the air tank pressure quickly. When driving with more than one trailer, which trailer should be the first one behind the tractor? D 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. Some vehicles have dead end or dummy couplers to which the hoses may be attached when they are not in use. B The trailer height is right when: The trailer will be raised slightly when the converter dolly is backed under it. 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. go to the rear of the second trailer and open the emergency line shut off, before you can supply air to the air tanks of the second trailer you need too, open the shut-off valves at the rear of the first trailer & close the shut-off valves at the rear of the second trailer. In order to supply air to the air tanks of a second trailer, you must ______ shut-off valves at the rear of the first trailer and ________ the shut-off valves at the rear of the second trailer.
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