A. for coupled doubles and triples, be sure that the pintle hook is in the open position C. 3, You are doing a walk around inspection of a double or triple trailer rig. Air escape from the open valve Check them all. The crack the whip effect that troubles trucks with trailers. Their drawbars differentiate them. C. may have poor traction due to bouncing and wheel lockup, Before you can supply air to the air tanks of a second trailer you need to: Email Updates When New Articles Are Posted. Once you are finished, click the button below. During normal operation the brakes of the double/triple trailer are controlled by: You are driving at night and you must dim your headlights for traffic. 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; . If the converter dolly is close to your semitrailer, you should wheel it into position? View More Details. You are driving with double trailers and must use your brakes to avoid a crash. A) one inch of space . which of these statements about quick steering movements and doubles/triples is true? 3. 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. After 15 years on the road I wanted to help people understand the trucking industry and everything that came with the career and lifestyle of an over the road trucker. front of the second trailer. A. release the spring brakes and check for movement 2) the second test is to go out to the trailer to ensure that the parking brakes have indeed applied. Calculate the Mach number at section 2. Park on level ground, put chock on the tires, and charge the air tank. 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. This has the same value as the %%WRONG_ANSWERS%% Variable on the Final Screen. If spare tire is carried on converter gear (dolly), make sure it's secured. Some areas of concern are discussed below. 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: With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. When pulling a single trailer with a Shut-Off Valve, the valves must be in the: Trailers built before what year may not be equipped with trailer spring brakes? Shut off valves are only used on trailers designed to be towed in conjunction with other trailers (doubles / triples). A sudden movement with the steering wheel can result in a tipping over rear trailer. The word part ferrit- means: 0000010285 00000 n 2. Trucks with trailers have a dangerous crack-the-whip effect. More driving knowledge, questions and answers, online practice tests for obtaining a drivers . When driving with more than one trailer, which trailer should be the first one behind the tractor? some large trucks have curved (convex or spot) mirrors. With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. A-dolly. [California Commercial Driver Handbook] The weight of a truck: Is a major factor affecting stopping distance. What is most likely to happen if the trailer protection valve of a double or triple trailer does not function correctly? The road is dry and the visibility is good. When driving a truck with more than one trailer, which trailer should be first behind the truck? The heavier trailer should be in the rear. 1 Sometimes, metal tags are attached to the lines with the words service and emergency stamped on them. A You will not be tested on uncoupling twins unless you want to get a double/triple trailer endorsement on your license. door. Safety should never take second place, so know your stuff! 0000007508 00000 n Ensuring the safety of the public starts with a thorough to re-capture it. Open the shut-off valves at the rear of the last trailer and listen for air flow. They provide the air pressure used to operate trailer brakes. The last trailer in a combination is most likely to turn over. You can also reach us at (888) 830-2326. B Take special care when pulling two and three trailers. 0000008187 00000 n What will happen if there is a major leak in the service air line? utilize the brakes. You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. When inspecting doubles and triples you must make sure there is air all the way to the back of the last trailer, otherwise what may not work? If the fifth wheel on a coupling is too far forward, the tractor frame may hit? Take special care when pulling two and three trailers. They are filled by the emergency (supply) line from the tractor. Light cords firmly in sockets on trailer. rear trailer. If your tanks have automatic drains, they will keep most moisture out, but you should still open the drains to make sure. How do you know if your converter dolly is equipped with antilock brakes? All material on this website is copyrighted. There is a school zone ahead. D A. completely open To uncouple the rear trailer in a set of doubles, the shut-off valve at the rear of the front trailer should be: Closed. B. releasing the pintle hook What does the drivers manual say about how much space you should keep ahead of your truck? Then, the air loss from the leak will lower the air tank pressure quickly. Therefore, look far ahead so you can slow down or change lanes gradually when necessary. To do this without wheel chocks you should: Empty trucks: When parking your double or triple combination, you should look for a parking space You must treat a flashing red signal as you would treat a STOP sign. Our normal business hours are Monday-Friday 8 a.m. to 5 p.m. (Pacific Time). This is CDL Doubles and Triples Test 3in our original Classic Mode. S-cam brakes are the most common style brakes on large trucks today. Therefore, it is very important for safety that you use wheel chocks when you park trailers without spring brakes. Good speed management says you should: You must drive through deep or flowing water. Did you know you can fill out one quick form here on TruckingTruth and apply to several companies at once for paid CDL training? 3. 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. A. the total stopping distance of a truck is the distance it takes to stop once the brakes are put on at any speed B. you can almost always stop more quickly than you can turn We wish you the best of luck in your endeavors and are pleased to be of assistance. 0000001582 00000 n Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? What should you check for when inspecting the converter dolly and the pintle hook? D 1/2 to 3/4 of an inch with the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the trailer. C. open, except the one connected to the rear trailer should be closed, During normal operation the brakes on double and triple trailers are controlled by the: The puzzle: At the far left edge, the plates are in contact, so the path length difference between rays 222 and 333 is zero. Doubles and triples are extremely prone to control issues and must be 1. Which of the following is true about loading cargo into double or triple trailers? A) closed . Air pressure is sent from the air tanks to the brakes by relay valves. 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. A full trailer behind a truck A. open b. cell The emergency brakes come on whenever air pressure in the emergency line is lost. and possible answers include: open, free or closed, latched or closed, free or open, latched from TruckersDouble & Triple Trailer (CDL) Endorsement. What is a converter dolly? 2 True! how much space should be between the upper and lower fifth wheel? A major leak in the emergency line will cause the tractor protection valve to close and the trailer emergency brakes to come on. The shortest trailer How do you know if your converter dolly is equipped with antilock brakes? first check for battery voltage to the valve by probing the wires of the electrical connector with a volt-meter it should be about 10.5 volts if not it's probably bad.next remove the valve. 6. If you have traffic on both sides of your vehicle and something is blocking your lane, a move to the right still be best. What is a converter dolly? D 21 0 obj << /Linearized 1 /O 23 /H [ 1162 213 ] /L 29759 /E 11109 /N 7 /T 29221 >> endobj xref 21 38 0000000016 00000 n B. you should avoid traveling next to others whenever possible Which trailer should come first behind the tractor? Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? For emergency braking you should: B. johnson bar Which is most likely to tip over: Help your friends discover what it takes to become a successful truck driver. The dolly tow bar may fly up, possibly causing injury, and making it very difficult to X D5^4aX{Ka)nT)Ac g" endstream endobj 58 0 obj 108 endobj 23 0 obj << /Type /Page /Parent 19 0 R /Resources 24 0 R /Contents [ 31 0 R 33 0 R 35 0 R 46 0 R 48 0 R 50 0 R 52 0 R 54 0 R ] /MediaBox [ 0 0 612 792 ] /CropBox [ 0 0 612 792 ] /Rotate 0 >> endobj 24 0 obj << /ProcSet [ /PDF /Text ] /Font << /F2 37 0 R /F4 40 0 R /TT2 28 0 R /TT4 26 0 R /TT6 42 0 R /TT8 44 0 R >> /ExtGState << /GS1 55 0 R >> /ColorSpace << /Cs5 29 0 R >> >> endobj 25 0 obj << /Type /FontDescriptor /Ascent 905 /CapHeight 0 /Descent -211 /Flags 32 /FontBBox [ -222 -325 1072 1037 ] /FontName /ArialMT /ItalicAngle 0 /StemV 0 >> endobj 26 0 obj << /Type /Font /Subtype /TrueType /FirstChar 32 /LastChar 121 /Widths [ 278 0 355 0 0 0 0 191 333 333 0 0 278 333 278 278 556 556 556 556 556 556 556 556 556 556 278 0 0 0 0 556 0 667 667 722 722 667 611 778 722 278 0 667 556 833 722 778 667 0 722 667 611 722 0 944 0 667 0 0 0 0 0 0 0 556 556 500 556 556 278 556 556 222 222 500 222 833 556 556 556 556 333 500 278 556 500 722 500 500 ] /Encoding /WinAnsiEncoding /BaseFont /ArialMT /FontDescriptor 25 0 R >> endobj 27 0 obj << /Type /FontDescriptor /Ascent 905 /CapHeight 0 /Descent -211 /Flags 96 /FontBBox [ -262 -325 1082 1025 ] /FontName /Arial-ItalicMT /ItalicAngle -15 /StemV 0 >> endobj 28 0 obj << /Type /Font /Subtype /TrueType /FirstChar 32 /LastChar 118 /Widths [ 278 0 0 0 0 0 0 191 0 0 0 0 0 333 278 278 556 556 556 556 556 556 556 556 0 0 0 0 0 0 0 0 0 0 0 722 722 0 0 0 0 0 0 0 0 833 0 0 667 0 0 0 611 0 0 0 0 0 0 0 0 0 0 0 0 556 556 500 556 556 0 556 0 222 0 0 222 833 556 556 556 0 333 500 0 556 500 ] /Encoding /WinAnsiEncoding /BaseFont /Arial-ItalicMT /FontDescriptor 27 0 R >> endobj 29 0 obj [ /CalRGB << /WhitePoint [ 0.9505 1 1.089 ] /Gamma [ 2.22221 2.22221 2.22221 ] /Matrix [ 0.4124 0.2126 0.0193 0.3576 0.71519 0.1192 0.1805 0.0722 0.9505 ] >> ] endobj 30 0 obj 638 endobj 31 0 obj << /Filter /FlateDecode /Length 30 0 R >> stream B Which is most likely to tip over: 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. not have spring brakes. A Open, latched B Open, free C Closed, latched D Closed, free 28. 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. B. for doubles and triples, the fifth wheel should be all the way towards the tractor Flammable materials in the front trailer then it must have the placards on that trailer. the trailer height is right when: the trailer will be raised slightly when the converter dolly is backed under it. Which of the following will probably happen if you are driving a double rig and a set of trailer wheels goes into a skid? 0000009556 00000 n In normal operation, trailer service brakes should be operated by? The converter dolly air tank drain valve on coupled double and triple trailers should be: A. open B. closed C. partially opened B When inspecting coupled doubles and triples, make sure the pintle hooks are: A. secured to the safety pins B. in the open position C. latched C Which of these is true? The trailer height is right when: The trailer will be raised slightly when the converter dolly is backed under it. you should avoid traveling next to others when possible. - Converter dolly air tank drain valve: CLOSED. Locking jaws closed on You should NOT: You are doing a walk around inspection of a double or triple trailer rig. For all brakes to work on a triple combination, you must have air supply? A 360 degree area of awareness is Time allowed (Requires timer add on). Refers to pulling two trailers at the same time, otherwise known as "pups" or "pup trailers" because they're only about 28 feet long. True! When the road is dry A All ABS equipped units Which diagram shows the best way to turn? allow "much more space than is needed for ideal driving conditions". C. use controlled or stab braking, The best way to stop any skid is to: The couplers have a rubber seal that prevents air from escaping. Terms in this set (43) Converter dollies are used to connect: A tractor-trailer combination to another trailer. Locking jaws closed on The number of correct answers. View the full article to see how to set cruise control correctly! Converter dolly air tank drain valve: CLOSED Air lines supported and glad hands properly connected. you want to hook your combination to a second trailer that has no spring brakes. These valves permit closing the air lines off when another trailer is not being towed. Older trailers do not have spring brakes. When does the "driver's manual" advise disconnecting the steering axle brakes to help A The road is dry, and visibility is good. There are more things that can go wrong, and doubles/triples are less stable than other commercial vehicles. Be sure pintle-eye of dolly is in place in pintle hook of trailer(s). How can you test that air flows to all trailers? 0000001375 00000 n Definition. Open, free Clean the couplers and rubber seals before a connection is made. A. you can steer more quickly and safely if you hold the wheel with one hand B. allow one vehicle length for every 10,000 lbs of gross vehicle weight Charge the system and pump the brakes with the window down. If you do, there is a problem. If this lamp is illuminated and does not go out, Before coupling a trailer, you should make sure it is at the right height using? B. do not need to be checked as often as flat mirrors because they show a larger area D Open, latched 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. What three methods can you use to secure a second trailer before coupling? you are visually checking the coupling of a converter dolly to the rear trailer. On a triple combination, the shutoff valves on the rear of the last trailer should be? There are more things that can go wrong, and doubles/triples are less stable than other commercial vehicles. Which of the following must be connected when coupling tractor to trailer or trailer to trailer? These dollies will have a yellow lamp on the left side of the dolly Questions You Should Know For Doubles And Triples 1. You should hear air escaping, showing the entire system is charged. While inspecting your converter dolly coupling, you should make sure there is _____ between the upper and lower fifth wheel. open, closed, closed: Term. Watch the wording of the question AND the answers A safe driver will look for all of the above. Nothing, the weight of the trailer will keep it in place, 10. Locking jaws open When uncoupling, you should never unlock the _______ with the dolly still under the rear trailer. When you do this, you should hear: safe speed would be 40 MPH. 12, 3. The driver will be required to complete this requirement in three eight hour shifts. How much space should be between the upper and lower fifth wheel? What is the most common foundation brake found on heavy vehicles? What value of channel width must the design use? Open the emergency line shut-off valve at the rear of the last trailer. 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. HlTo xGf`{iIMh-x||?pbE':X4ZZZRbu7 uvi_RHUkVXBVu{^B3 4e/iw\]RE] YY7i)e V*h(++WQ-]Xm9c5yU6BS" 5HiL,[b)ee:t/ )%BVGpU7T\ZJD kingpin, That there is grease between upper and lower fifth wheel. A converter dolly is still under the second trailer when you unlock the pintle hook. and ensuring it is secure. You should look into the back of the fifth wheel on a dolly to see if it is locked onto the kingpin, A safe speed on a curve for a straight truck or a single trailer combination vehicle may be too fast for double or triple trailers. In a certain electronic device, a three-stage amplifier is desired, whose overall voltage gain is 42 dB. They provide the air pressure used to operate trailer brakes. speed and start spinning again, in turn stopping your skid, All the listed answers would be correct. D. Make sure the spare tire is secured, if it has one. 0000010306 00000 n There is no requirement or exact standard for color coding. Visually check to make sure that the lead trailer is slightly higher than the center of Pintle hook latched. 60607. and the converter dolly air tank drain valve should be _____. The crack the whip effect will topple the rear trailer first. Blue is used for the service lines, and red for the emergency (supply) lines. 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. 5. Doubles and triples must be driven very smoothly to avoid rollover or jackknife. The Verge logo. Driving doubles/triples is also more dangerous in hot and cold weather driving, as well as on mountain roads. A. use a low gear 0000007032 00000 n Provides a snug fit to eliminate unwanted seepage of air or water. Before you can supply air to the air tanks of a second trailer you need to. Typically depends on the axle count. Park the rear trailer against another trailer, chock the tires and lock the trailer Usually need a glad hand converter 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. Always unlock the pintle hook with the dolly still under the rear trailer. Pickup at South Loop. You are driving a 100-feet truck with double trailers at 30 mph. Which the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the trailer. _______ should be tested with the hand valve but controlled in normal operation with the foot pedal. retrovirus $_____________________________$. Stop the vehicle by gearing down and sparingly Make sure you do not get in a spot you cannot pull straight through. A connection device of one axle used to disconnect a semitrailer combination vehicle We are an independent company focused on providing valuable motor vehicle and permit practice test information. You want to lock your combination to a second trailer that has no spring brakes. 1/3 For example: If you are traveling 60 MPH and it begins to rain, your suggested 3. You are driving a tractor with multiple trailers. If the dolly is a two axle unit then 1 The lighter trailer should be in the rear. Compressed air usually has some water and some compressor oil in it. You should keep at least ____ seconds of space ahead of you. Unless you are draining the condensation out of the air tank, then the drain valve Have little braking power because they are small Safety chains should be secured to trailer(s). There is more chance for skids and loss of traction. 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. Each trailer and converter dolly has one or more air tanks. None of the above, 5. You should keep at least ____ seconds of space ahead of you. A. air escape from the open valve Should the shut-off valves on the rear of the last trailer be open or closed? These valves permit closing the air lines off when another trailer is not being towed. 0000002446 00000 n 9. coupled to the rear of a tractor-trailer combination forming a double bottom rig, Careful of the wording! Pintle-eye of dolly in place in pintle hook of trailer (s). Doubles and triples must be driven very smoothly to avoid rollover or jackknife. C. closed, You can release the dolly brakes by: How do you check to make sure trailer height is correct before coupling? 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 The pintle hook? A recouple. Ensuring the safety of the public starts with a thorough inspection of all equipment. Stay up to date on truck driving industry news. D The lighter semitrailer should be in first position behind the tractor. 0000007487 00000 n With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. 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 _____. Often do not have spring brakes 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? You open the emergency line shut-off valve at the rear of the last trailer and hear air escaping. A 0000006195 00000 n When coupling twin trailers, a converter dolly is. . B. 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. C. the service brakes slowly move to the fully applied position, Some large trucks have converted or "spot" mirrors. For emergency braking you should: which of these statements about emergency steering is true? A. allow "much more space" than is needed for ideal driving conditions Doubles and triples must be driven very smoothly to avoid rollover or jacknife. Closed, latched The application only takes one minute. High Road 2.0! 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. Submit your email at the end of the test. The trailer height is right when: The trailer will be raised slightly when the converter dolly is backed under it. Go to the rear of second trailer and open the emergency line shut-of valve. unsafe slow down even further, or better yet, find a safe haven and park until the You are visually checking the coupling of a converter dolly to the rear trailer. c. iron A. use light, steady pressure on the brake pedal The trailer brakes will unlock These mirrors: make things seem smaller & further away then they really are. 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.

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