speed and start spinning again, in turn stopping your skid, All the listed answers would be correct. What does the Driver's manual say about how much space you should keep ahead of your truck? A 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. In order to receive your Doubles and Triples endorsement, it is required that you pass the state's official CDL written Knowledge exam. you should check the trailer height before connecting a converter dolly to a second or third trailer. Blue is used for the service lines, and red for the emergency (supply) lines. For emergency braking you should: which of these statements about emergency steering is true? For emergency braking you should: You are doing a walk around inspection of a double or triple trailer rig. TestPermit.com provides free unofficial review materials for a variety of exams. All trademarks are property of their respective owners. The application only takes one minute. If the spring brakes do not release when you push the trailer air supply control, check the air line connections. 4. Because of this, which of the following vehicle parts is most likely to tip over? C Which is most likely to tip over: A The driver must yield the right-of-way to other vehicles when merging and when entering a highway from an alley. Doubles and triples must be driven very smoothly to avoid rollover or jackknife. The puzzle: At the far left edge, the plates are in contact, so the path length difference between rays 222 and 333 is zero. The rear trailers shut-off valves should be open and the front closed. When does the Driver's manual say you should disable the steering axle brake? Each trailer and converter dolly has one or more air tanks. 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? At TruckingTruth we'll help you decide if trucking is right for you and help you get your career off to a great start. A low air buzzer will go off indicating something is wrong and either the front or the and ensuring it is secure. If there is a trailer A. brake and downshift in a curve Hit the article below to see specific information about AOBRDs! 0000006383 00000 n When checking the coupling system, make sure that the locking jaws are around the shank of the. True! what is likely to happen if the pintle hook is unlocked with the dolly still under the second trailer? That split second that you release the brakes will allow them to match the vehicles road 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. . B. for doubles and triples, the fifth wheel should be all the way towards the tractor A turn of the glad hand attached to the hose will join and lock the couplers. 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. Should I Be A Truck Driver? In order to receive your Doubles and Triples endorsement, it is required that you pass the states official CDL written Knowledge exam. What's a converter dolly? If there are no dummy couplers, the glad hands can sometimes be locked together (depending on the couplings). 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. 5. 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. 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. Flammable materials in the front trailer then it must have the placards on that trailer. Sketch the shape of the passage between sections 1 and 2. It is important to check the height of the trailer before connecting a converter dolly to a trailer. View More Details. Pull gently against the pin of the second trailer. 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. What is the most common foundation brake found on heavy vehicles? The air lines will rupture 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. 0000004689 00000 n 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. Open C. closed, You can release the dolly brakes by: 1/2 to 3/4 of an inch Which of the following will probably happen if you are driving a double rig and a set of trailer wheels goes into a skid? The coupling between a rear trailer and a dolly should have a space between the upper and lower fifth wheels of? 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 . Make sure you can hear air escaping with the valve closed. to re-capture it. B. johnson bar 0000005733 00000 n Each tank has a drain valve on it, and you should drain each tank every day. Doubles and triples are extremely prone to control issues and must be Many scientists are concerned that the melting of Earth's sea ice will increase Earth's surface temperature. A good speed management says you should, may have poor traction due to bouncing and wheel lock up. A. for coupled doubles and triples, be sure that the pintle hook is in the open position 1 ), a 15 year truck driving veteran, in January 2007. NPT thumbscrew style design enables easy installation. 0000003261 00000 n When you're finished, check your score and results. You must stop, yield to traffic and pedestrians, and only proceed when safe. Once that's complete, then its an easy push back and the you should avoid traveling next to others when possible. Any trailer with a reduced ground clearance They provide the air pressure used to operate trailer brakes. Allow much more space than is needed for ideal driving condition. The pressure in the service line tells how much pressure the relay valves should send to the trailer brakes. These mirrors: Make things seem smaller and further away than they really are. 0000002636 00000 n A good and safe driver will always look out for ______. What is one function of the tractor protection valve? You should keep at least _____ seconds of space ahead of you. 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. the emergency line valve open and release air CDL License Requirements State By State. While inspecting your converter dolly coupling, you should make sure there is _____ between the upper and lower fifth wheel. The lighter trailer should be in the rear. B. slightly open D Feel Free to add additional fields for the Quiz Taker to complete using the "Add Fields" options to the right. For emergency braking you should: May have poor traction due to bouncing and wheels lockup. You are doing a walk around inspection of a double or triple trailer rig. 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. 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. Doubles and triples must be driven very smoothly to avoid rollover or jackknife. You should NOT: You are driving a set of doubles and a set of trailer wheels goes into a skid. 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You will speak with recruiters today. when does the drivers manual say you should disable the steering axle brakes? rear brakes will not work properly. But the brakes will hold only as long as there is air pressure in the trailer air tank. B. you should avoid traveling next to others whenever possible You should keep at least ___ seconds of space ahead of you. The rear trailers shut off valves should be closed and the front open to allow air to the Shut off valves are only used on trailers designed to be towed in conjunction with other trailers (doubles / triples). They are filled by the emergency (supply) line from the tractor. Nothing, the weight of the trailer will keep it in place, 10. Also available in App Store & Google Play. symptoms of a bad fuel tank selector switch. With the red knob pushed in on the tractor dash, the service line should have air in it. There are more critical parts to check when you have two or three trailers. You wish to turn right from one two-lane, two-way street to another. However there are some states that allow doubles that are each 48 feet in length. C. engaging the tractor valve protection control, You must drive through deep or flowing water. The rear trailer of a double Open. 0000008894 00000 n Related Question Question: What does this sign mean? You are driving with double trailers and must use your brakes to avoid a crash. B. allow one vehicle length for every 10,000 lbs of gross vehicle weight When you are pulling trailers, which of the following statements is true about steering? Double and triple trailers increase not only the operators risk of safety, but also the other motorists around him. Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? You must steer gently when pulling trailers. New! A Commercial Drivers License Overview, Trucking Terminology and Transportation Definitions. The trailer height is right when: The trailer will be raised slightly when the converter dolly is backed under it. Which of the following must be connected when coupling tractor to trailer or trailer to trailer? 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. Take special care when pulling two and three trailers. 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. (done) Chp 23: Cash Flow + Working Capital, Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer. converting it into two trailers, A coupling device of three or four axles and a fifth wheel by which a semitrailer can We wish you the best of luck in your endeavors and are pleased to be of assistance. The dolly will have a yellow lamp on the drivers (left) side. open, closed, closed: Term. A 360 degree area of awareness is you are visually checking the coupling of a converter dolly to the rear trailer.

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