the crack-whip effect that triubkes trucks with trailers is most likely to cause a tip over when. The shortest trailer You will have greater length and more dead axles to pull with your drive axles than other drivers. 10 To do this without wheel chocks you should: Empty trucks: When parking your double or triple combination, you should look for a parking space Any vehicle required by federal regulations to be placarded while transporting hazardous materials. C. use controlled or stab braking, The best way to stop any skid is to: Did you know you can fill out one quick form here on TruckingTruth and apply to several companies at once for paid CDL training? How much space should be between the upper and lower fifth wheel? You are driving with double trailers and must use your brakes to avoid a crash. Sometimes, metal tags are attached to the lines with the words service and emergency stamped on them. fifth wheel, so trailer is raised slightly when dolly is pushed under it. C. 3, You are doing a walk around inspection of a double or triple trailer rig. 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. With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. 0000007508 00000 n What types of trailers can get stuck on raised crossings? When connecting a converter dolly to a rear trailer, the trailer height must be adjusted so that it is? New! 0000001582 00000 n B Stay up to date on truck driving industry news. They are filled by the emergency (supply) line from the tractor. Close the emergency line shut-off valve at the rear of the trailer. None of the above, 4. Pull gently against them in a low gear to make sure the brakes work. 0000001775 00000 n converting it into two trailers, A coupling device of three or four axles and a fifth wheel by which a semitrailer can When connecting two trailers the converter dolly is connected to the rear trailer first. 9. Go to the rear of second trailer and open the emergency line shut-of valve. B. johnson bar B. restore traction to the tires The shut off valves, when in the open position, allows air to flow out to another trailer. ADVERTISEMENT ADVERTISEMENT your vehicle is so long that you must swing wide to make a turn. Shut off valves are only used on trailers designed to be towed in conjunction with other trailers (doubles / triples). You can find it here: High Road 2.0. The coupling between a rear trailer and a dolly should have a space between the upper and lower fifth wheels of? In double and triple trailers, the trailer air supply control should pop or _________ when air pressure drops into the range of 20 to 45 psi. 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. The trailer height is right when: The trailer will be raised slightly when the converter dolly is backed under it. 2) the second test is to go out to the trailer to ensure that the parking brakes have indeed applied. Which the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the trailer. Eventually, the air will leak away, and then there will be no brakes. The braking systems of double and triple trailers are different than those of straight trucks because doubles and triples. Air will not be available to release the trailer spring brakes (parking brakes). What is the most common foundation brake found on heavy vehicles? Leave the emergency line shut-off valve closed and open the service line valve. Make sure to visually inspect the fifth wheel and that the locking mechanism is All rights reserved Site Map. Never, 9. Chock the tires, park on level ground and charge the trailer air tank if it does The road is dry and visibility is good. 0000001375 00000 n Antilock Braking Systems on Converter Dollies, Converter dollies built on or after March 1, 1998, are required to have antilock brakes. cQ 220rd8bihuM#Om>G*Lz)g^\l9'A9/omf|b49U[@%jGT-QR6i. A truckers workspace is a small moving office Read More. When you do this, you should hear: Ais escape from the open valve. 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. Air pressure is sent from the air tanks to the brakes by relay valves. Doubles and triples are more likely to turn over than other combination vehicles because of what effect? On a triple combination, the shutoff valves on the rear of the last trailer should be? Once you are finished, click the button below. Air escape from the open valve However, converter dollies and trailers built before 1975 are not required to have spring brakes. Go to Section 4: Other Topics This question is in Section 4: Other Topics of our CDL Test Guide. The trailer brakes will unlock 0000008894 00000 n C. make things look larger and closer to you than they really are, When hauling triple trailers at a speed less than 40 mph, you should leave at least _____ second(s) for every ten feet of your truck between you and the vehicles ahead of you. It is important to check the height of the trailer before connecting a converter dolly to a trailer. When uncoupling a rear trailer, you should remove some weight from the dolly by? Remember, the service line is not used unless you depress the brake pedal or use the trailer hand valve. If there is a trailer D Doubles and triples are more likely to turn over than other combination vehicles because of the "crack- the-whip" effect. Connect the Converter Dolly to the Rear Trailer: Test the coupling by pulling against the pin of the second semitrailer. open, closed, closed: Term. Always unlock the pintle hook with the dolly still under the rear trailer. Which of the following statements about off tracking is true? The heavier trailer should be in the rear. Email Updates When New Articles Are Posted. Safety chains should be secured to trailer(s). 1 D C recouple. You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. Therefor, if there is a major leak in your service line, you may not know it until you try to use the service brake. Open the shut-off valves at the rear of the last trailer and listen for air flow. B. open; latched C This has the same value as the %%TIME_USED%% Variable on the Final Screen. Make sure trailer height is correct. symptoms of a bad fuel tank selector switch. 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. It is very important to keep the air supply clean. If the fifth wheel on a coupling is too far forward, the tractor frame may hit? A converter gear or dolly is a coupling device of one or two axles and a fifth wheel by which a semi-trailer can be coupled to the rear of a tractor-trailer combination forming a double bottom. 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. Make sure pintle hook is latched. Locking jaws closed on With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. The dolly tow bar may flip up causing bodily injury and making it very difficult to Sketch the shape of the passage between sections 1 and 2. By clicking on "Sign Up", you agree to our Terms of Use and Privacy Policy. doubles/triples flip flop over from quick steering movements more easily than many other vehicles. If one air system is very low on pressure _______. Safety chains secured to trailer (s). 0000006836 00000 n Time allowed (Requires timer add on). How can you test that air flows to all trailers? 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. locked . C. drive through quickly, With the hand valve on, you should test the trailer brakes by opening the service valve line at the rear of the rig. Which of these is most likely to occur? You shouldn't stop braking. With the red knob pushed in on the tractor dash, the service line should have air in it. You have not finished your quiz. Make sure you can hear air escaping with the valve closed. For emergency braking you should: You are doing a walk around inspection of a double or triple trailer rig. You should be sure the converter dolly air tank drain valves are _______ and the pintle hook is _____. This will prevent water and dirt from getting into the coupler and the air lines. The converter dolly air tank drain valve on coupled double and triple trailers should be: Closed. 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. not have spring brakes. A full trailer behind a truck You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. Mar 2 - Mar 3. If the spring brakes do not release when you push the trailer air supply control, check the air line connections. you should avoid traveling next to others when possible. 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. Terms in this set (43) Converter dollies are used to connect: A tractor-trailer combination to another trailer. When coupling twin trailers, a converter dolly is. Ship to Store. you are visually checking the coupling of a converter dolly to the rear trailer. Have little braking power because they are small 0000008166 00000 n A. allow "much more space" than is needed for ideal driving conditions Watch the wording of the question AND the answers A safe driver will look for all of the above. The trailer is at the correct height when. Remember however, that is just a suggestion. When you go to the rear of the last trailer, what should you do to complete this check? a. blood What three methods can you use to secure a second trailer before coupling? That there is some space between the upper and lower fifth wheel. A. use a low gear Becoming A Truck Driver is a dream we've all pondered at some point in our lives. B Do converter dollies have spring brakes? You are driving with more than one trailer. you want to hook your combination to a second trailer that has no spring brakes. D When connecting the glad hands, press the two seals together with the couplers at a 90-degree angle to each other. C. always keep your vehicle to the left side of your lane, When testing the coupling of double trailers, the landing gear of the rear trailer should be: C. fully raised, Which of these statements about speed management and braking is true? When inspecting the air brakes on doubles and triples, you wait for air pressure to reach normal, then push in the red trailer air supply knob. 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. C A. closed; latched 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 Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? Be sure pintle-eye of dolly is in place in pintle hook of trailer(s). The dolly will have a yellow lamp on the drivers (left) side. A. always keep your vehicle to the right side of your lane D Use only the trailer brakes The application only takes one minute. A CDL is required to drive any of the following vehicles: A vehicle with two separate parts - the power unit (tractor) and the trailer. can and will get stuck on a raised railroad crossing. There are more things that can go wrong, and doubles/triples are less stable than other commercial vehicles. A. open the shut-off valves at the rear of both trailers to re-capture it. Air flows steadily and isentropically through a passage. 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. Should I Be A Truck Driver? Allow much more space than is needed for ideal driving condition. The converter dolly air tank drain valve on coupled double/triple trailers should be: Closed. dress gifs. and possible answers include: open, free or closed, latched or closed, free or open, latched from TruckersDouble & Triple Trailer (CDL) Endorsement. 6. Once that's complete, then its an easy push back and the you should not, when you turn with the tractor/triple trailer combination the wheels that offtrack(cheat) the most are. D. Make sure the spare tire is secured, if it has one. 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. True! 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. Tips for Backing Up a Trailer Like a Pro Trucker. [California Commercial Driver Handbook] The weight of a truck: Is a major factor affecting stopping distance. rear brakes will not work properly. on kingpin. A. require shorter stopping distances than full ones Typically depends on the axle count. good speed management says you should, may have poor traction due to bouncing and wheel lock up. You should be sure the converter dolly air tank . Closed, free, 8. A) closed . B. you should avoid traveling next to others whenever possible You should not hear air escaping. The final procedure when connecting a rear trailer is to? In bad weather, slippery conditions and mountain driving, you must be especially careful if you drive double and triple bottoms. then there is a problem with the ABS system. The number and size of air tanks varies among vehicles. You must treat a flashing red signal as you would treat a STOP sign. If there is air there, then there is air towards the cab You want to hook up to the first trailer, then the converter dolly while it is lined up in The pintle hook? A major leak in the emergency line will cause the tractor protection valve to close and the trailer emergency brakes to come on. 11 At section 2 downstream, the speed is 519 m/s. There is more chance for skids and loss of traction. What will happen if there is a major leak in the service air line? Our normal business hours are Monday-Friday 8 a.m. to 5 p.m. (Pacific Time). If it goes low enough, the trailer emergency brakes will come on. Which f these will result in the best control on curves? B. 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 . The last trailer in a combination is most likely to turn over. 1/3 For example: If you are traveling 60 MPH and it begins to rain, your suggested 0000010306 00000 n When the road is dry A sudden movement with the steering wheel can result in a tipping over rear trailer. Be sure air-lines are supported and glad hands are properly connected. You are doing a walkaround inspection of a double or triple trailer rig. What happens if you cross the Emergency Air Line and the Service Air Line? Explain why the waves that reflect from the far left edge of the plates in the given figure earlier exhibit destructive interference (zero intensity) at x=0x=0x=0. What's a converter dolly? C. closed; unlatched, Which of these will result in the best control on a curve? When coupling twin trailers, you should _______ the pintle hook and secure the dolly support in the _______ position. A dolly should be pulled out from a rear trailer using? These valves permit closing the air lines off when another trailer is not being towed. Slow to a safe speed before entering the curve, then coast through the curve. Light cords firmly in sockets on trailer. If you feel You are driving a 100 ft twin trailer combination at 50 mph. - Converter dolly air tank drain valve: CLOSED. What three methods can you use to secure a second trailer before coupling? Make sure the converter dolly air tank drain valve is closed. you should keep atleast __seconds of space ahead of you. You are doing a walk around inspection of a double or triple trailer rig. A) one inch of space . Ensuring the safety of the public starts with a thorough how much space should be between the upper and lower fifth wheel? 0000005345 00000 n It depends on the load 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. Their drawbars differentiate them. What do you check when making a visual check of coupling? 0000007032 00000 n you are driving at night and you must dim your headlights for traffic. The rear trailers shut-off valves should be closed and the front open. the road is dry & visibility is good. 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 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? B In the coupling system, the locking jaws should be fixed around? The driver must yield the right-of-way to other vehicles when merging and when entering a highway from an alley. A dolly is like a very short trailer, with a ring hitch on the front and a fifth wheel on top. While inspecting your converter dolly coupling, you should make sure there is _______ between the upper and lower fifth wheel. Which of these statements about quick steering movements and doubles/triples is true? 0000003060 00000 n B. allow one vehicle length for every 10,000 lbs of gross vehicle weight D 1/32 to 3/32 of an inch. 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. King pin. Each trailer and converter dolly has one or more air tanks. Visually check to make sure that the rear trailer is slightly lower than the center of the Make sure you have large enough gaps before entering or crossing traffic. c. iron 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. 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. A There is a school zone ahead. Each trailer and converter dolly has one or more air tanks. Converter dollies have spring brakes. trailer << /Size 59 /Info 20 0 R /Root 22 0 R /Prev 29211 /ID[] >> startxref 0 %%EOF 22 0 obj << /Type /Catalog /Pages 19 0 R >> endobj 57 0 obj << /S 66 /Filter /FlateDecode /Length 58 0 R >> stream Before you can supply air to the air tanks of a second trailer you need to. 0000007487 00000 n The air lines will rupture These trailers have no parking brake. Hazardous materials must be placarded on all four sides of EACH Trailer. When driving a double or triple trailer, greater care must be given to. C Why should you use chocks when parking a trailer without spring brakes? There is no obligation whatsoever. That there is no space between upper and lower fifth wheel. These mirrors: 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. They provide the air pressure used to operate trailer brakes. A The A-dolly has a single drawbar with a single, centered hitching point. which of these statements about managing space to the sides is true? What is one function of the tractor protection valve? Do converter dollies have spring brakes? Which of the following will probably happen if you are driving a double rig and a set of trailer wheels goes into a skid? Opening the shut off valves on the rear most trailer will ensure the lines are flowing When does the "driver's manual" advise disconnecting the steering axle brakes to help keep the rig straight? Connect Converter Dolly to Front Trailer Back first semitrailer into position in front of dolly tongue. The crack the whip effect will topple the rear trailer first. A dolly has lights, air tanks, air relays, air lines, air brakes, ABS, electrical connections, etc. Often do not have spring brakes Older trailers do not have spring brakes. and ensuring it is secure. D _______ should be tested with the hand valve but controlled in normal operation with the foot pedal. This has the same value as the %%WRONG_ANSWERS%% Variable on the Final Screen. How do you check to make sure the trailer height is correct before coupling? A. countersteer What value of channel width must the design use? The Verge logo. A coupled to the rear of a tractor-trailer combination forming a double bottom rig, Careful of the wording! kingpin. You are driving a triple trailer and there is a loss of air pressure in the emergency line. weather passes. Use controlled or stab braking When entering a roundabout, a driver must yield the right-of-way to drivers already in the roundabout and obey all traffic signs. Ideal for replacing a worn, leaky drain valve on a compressor. NPT thumbscrew style design enables easy installation. 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. Learn more and apply here: TruckingTruth was founded by Brett Aquila (that's me! A. hand valve Number of wrong answers. B. A You should hear air escaping, showing the entire system is charged. Should the shut off valves on the rear of the first trailer be open or closed on a set of double trailers? The converter dolly air tank drain valve on coupled double/triple trailers should be: You are driving a 100-feet truck with double trailers at 50 mph. Then, the air loss from the leak will lower the air tank pressure quickly. the rig will continue moving in a straight line no matter how much the steering wheel is turned. 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 _____. to do this without wheel chocks you should: supply air to the trailer air system with the tractor and then disconnect the emergency line. B We are here to help. On a triple combination, the shutoff valves at the rear off the middle trailer should be? Hit the article to see the way to back up your trailer like a pro! D Seriously! 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. %PDF-1.2 % When only pulling one trailer, be sure the shut-off valves are all in the fully closed position. you are driving on a slippery road during the day. 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 Air escape from the open valve You are driving with double trailers and must use your brakes to avoid a crash. The driver will be required to complete this requirement in three eight hour shifts. When the road is slippery 5. Should the converter dolly air-tank drain valve be open or closed on a double trailer combination? There are two types of converter dollies. If there are no dummy couplers, the glad hands can sometimes be locked together (depending on the couplings). To check that the trailer emergency brakes are working properly, you should pull out the trailer air supply control and? How do you check to make sure trailer height is correct before coupling? The emergency brakes come on whenever air pressure in the emergency line is lost. These dollies will have a yellow lamp on the left side of the dolly Questions You Should Know For Doubles And Triples 1. The lightest trailer 0000003998 00000 n Some areas of concern are discussed below. This section explains how important it is to be careful when driving with more than one trailer, how to couple and uncouple correctly, and about inspecting doubles and triples carefully. axle will have spring brakes due to the weight of the unit. The crack the whip effect that troubles trucks with trailers. For emergency braking you should: which of these statements about emergency steering is true? Take this same test in our other testing modes How to Get a Hazardous Materials Endorsement, What is a CDL? None of the above, 2. Unless you are draining the condensation out of the air tank, then the drain valve 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 . This has the same value as the %%SCORE%% Variable on the Final Screen. Clean the couplers and rubber seals before a connection is made. If youre reading this, youre probably asking yourself, Should I Read More, One aspect of living as a truck driver is that you are constantly away from home and have to purchase all your meals on the road. You should keep at least _____ seconds of space ahead of you. 0000006383 00000 n Locking jaws closed on The road is dry and visibility is good. The rear trailer does not have shut-off valves. C A. the total stopping distance of a truck is the distance it takes to stop once the brakes are put on at any speed C. the service brakes slowly move to the fully applied position, Some large trucks have converted or "spot" mirrors. 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 dolly is a two axle unit then 1 Why should you not use the trailer hand valve while driving? If you do, the brakes may not work correctly. Each tank has a drain valve on it, and you should drain each tank every day. All other trailer air functions use the emergency line. A. for coupled doubles and triples, be sure that the pintle hook is in the open position Like a trailer, a dolly equipped with ABS will have a yellow indicator light on the left side. securely fastened. How should you test the coupling? If you do, there is a problem. 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. 0000001162 00000 n Secure converter gear support in raised position. You are visually checking the coupling of a converter dolly to the rear trailer. 0000005554 00000 n C. foot pedal, Which of these statements about managing space to the sides is true? Charge the system and pump the brakes with the window down. the trailer height is right when: the trailer will be raised slightly when the converter dolly is backed under it. Types of converter dollies. Either the front or the rear brakes will not work properly or fully. 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. . Push the brake pedal as hard as you can and hold it there D Your vehicle is so long that you must swing wide to make the turn. C. closed, You can release the dolly brakes by: Blue is used for the service lines, and red for the emergency (supply) lines. For all brakes to work on a triple combination, you must have air supply? A How can you test that air flows to all trailers? A 360 degree area of awareness is Which is most likely to tip over: In a certain electronic device, a three-stage amplifier is desired, whose overall voltage gain is 42 dB. Some large trucks have curved (convex or spot) mirrors. Open Hook dolly to front trailer. B. slightly raised C when does the drivers manual say you should disable the steering axle brakes? Open the emergency line shut-off valve at the rear of the last trailer. Describe what the trailer air supply control does.

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