For emergency braking you should: You are doing a walk around inspection of a double or triple trailer rig. What three methods can you use to secure a second trailer before coupling? With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. 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. 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. Locking jaws closed on Dont hesitate to take advantage of our practice tests in each category specific to your needs. Tractor-trailers are considered combination vehicles. A-dolly. Take special care when pulling two and three trailers. _______ should be tested with the hand valve but controlled in normal operation with the foot pedal. 3. axle will have spring brakes due to the weight of the unit. When only pulling one trailer, be sure the shut-off valves are all in the fully closed position. 0000001375 00000 n Usually need a glad hand converter Slow to the safe speed before entering, then accelerate slightly through the curve. If this lamp is illuminated and does not go out, Question 3 Explanation: All of the above. Open, latched weather passes. The rear trailers shut-off valves should be closed and the front open. Air flows steadily and isentropically through a passage. d. protein. The A-dolly has a single drawbar with a single, centered hitching point. how can you be sure you supplied air to a second trailer? Hook dolly to front trailer. B. do not need to be checked as often as flat mirrors because they show a larger area 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: Each trailer and converter dolly has one or more air tanks. 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. 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. The heaviest trailer Slow to the safe speed before entering, then accelerate slightly through the curve. The tanks will hold enough air to allow the brakes to be used several times even if the compressor stops working. 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. C. engaging the tractor valve protection control, You must drive through deep or flowing water. Be certain you are clear at the sides before changing lanes. dress gifs. Correct answer percentage. Safety fail-safe features of a tractor-trailer converter dolly. 0000001162 00000 n C. back up slightly and make a visual check of the coupling, You are driving with double trailers and must use your brakes to avoid a crash. Which of the following will occur? A) 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. . The puzzle: At the far left edge, the plates are in contact, so the path length difference between rays 222 and 333 is zero. You should keep at least ____ seconds of space ahead of you. If there is a trailer How should you test the coupling? C Clean the couplers and rubber seals before a connection is made. Your vehicle is so long that you must swing wide to make the turn. What is a converter dolly? 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. you should keep atleast __seconds of space ahead of you. This has the same value as the %%TOTAL%% Variable on the Final Screen. should remain in the closed position. For all brakes to work on a triple combination, you must have air supply? On the middle trailer of a set of triples? A. open Seriously! For emergency braking you should: A Push the brake pedal as hard as you can and hold it there B There is more chance for skids and loss of traction. Watch the wording of the question AND the answers A safe driver will look for all of the above. Each trailer and converter dolly has one or more air tanks. What happens if you cross the Emergency Air Line and the Service Air Line? 0000002446 00000 n For emergency braking you should: Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? If spare tire is on converter gear (dolly), make sure it is secured. 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. 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. A major leak in the emergency line will cause the tractor protection valve to close and the trailer emergency brakes to come on. recouple. How much space should be between the upper and lower fifth wheel? "Glad hands" are coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer. To check if the converter dolly is securely coupled to the rear trailer you should: Pull gently against the pin of the second trailer. you should avoid traveling next to others when possible. This has the same value as the %%WRONG_ANSWERS%% Variable on the Final Screen. 2. which of these is not a good thing to do when driving on slippery roads? The shut off valves prevent air from going any further. D If you do, the brakes may not work correctly. 0000008894 00000 n Make sure trailer height is correct. When testing the coupling of the double trailer the landing gears of the rear trailer should be: You want to hook your combination to a second trailer that has no spring brakes. Our business address is: Attn: Class A Drivers MH Sub I, LLC dba Internet Brands 909 N Pacific Coast Highway, 11th Floor El Segundo, CA 90245. It is very important to keep the air supply clean. Should the pintle hook be latched or unlatched when backing a dolly under the second trailer? They are filled by the emergency (supply) line from the tractor. Once you have coupled your rear trailer, you should test the coupling by? The dolly tow bar may flip up causing bodily injury and making it very difficult to A connection device of one axle used to disconnect a semitrailer combination vehicle you are doing a walkaround inspection of a double or triple trailer rig. 8. B. restore traction to the tires 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. The trailer brakes will unlock 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: 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. during normal operation the brakes of the double/triple trailer are controlled by : which of these will result in the best control on curves? There are more critical parts to check when you have two or three trailers. A. release the spring brakes and check for movement B. for doubles and triples, the fifth wheel should be all the way towards the tractor Any trailer with a reduced ground clearance Antilock Braking Systems on Converter Dollies, Converter dollies built on or after March 1, 1998, are required to have antilock brakes. Each tank has a drain valve on it, and you should drain each tank every day. the trailer height is right when: the trailer will be raised slightly when the converter dolly is backed under it. This means. The front trailer in a set of double trailers is most likely to turn over due to the Crack-the-Whip effect. You should be sure the converter dolly air tank . In order to receive your Doubles and Triples endorsement, it is required that you pass the states official CDL written Knowledge exam. Once you are finished, click the button below. ADVERTISEMENT ADVERTISEMENT How To Use Cruise Control Effectively As A Truck Driver. The lighter semitrailer should be in first position behind the tractor. 0000006836 00000 n 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. What do you check when making a visual check of coupling? 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. [California Commercial Driver Handbook] The weight of a truck: Is a major factor affecting stopping distance. The service brakes slowly move to the fully applied position A 360 degree area of awareness is View the price and details of this FINSBURY PUMP SYSTEMS 400L (SINGLE STAGE) 5.5HP HONDA GX PETROL ENGINE (18M HOSE) FIRE WATER TANK | Mobile fire units. not have spring brakes. Ensuring the safety of the public starts with a thorough inspection of all equipment. Do converter dollies have spring brakes? Good speed management says you should: You must drive through deep or flowing water. If the fifth wheel on a coupling is too far forward, the tractor frame may hit? A. C. closed, You can release the dolly brakes by: Any time you have to Make sure you have large enough gaps before entering or crossing traffic. We are an independent company focused on providing valuable motor vehicle and permit practice test information. Ship to Store. These valves permit closing the air lines off when another trailer is not being towed. Closed, latched Which f these will result in the best control on curves? a. blood Doubles and triples are more likely to turn over than other combination vehicles because of the "crack- the-whip" effect. D 2. Stay up to date on truck driving industry news. Either the front or the rear brakes will not work properly or fully. The converter dolly air tank drain valve on coupled double and triple trailers should be: Closed. Should the shut-off valves on the rear of the last trailer be open or closed? Stop the vehicle by gearing down and sparingly and possible answers include: open, free or closed, latched or closed, free or open, latched from TruckersDouble & Triple Trailer (CDL) Endorsement. rear brakes will not work properly. Follow the procedures described later in this section. 12, 3. Open C. foot pedal, Which of these statements about managing space to the sides is true? If there is You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. Doubles and triples are more likely to overturn than other combination vehicles because of the whip cracking effect. A safe speed on a curve for a straight truck or a single trailer combination vehicle may be too fast for a set of doubles or triples. Light cords firmly in sockets on trailer. Doubles/triples flip flop over from quick steering moves more easily than many vehicles. You must treat a flashing red signal as you would treat a STOP sign. you are visually checking the coupling of a converter dolly to the rear trailer. Which the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the trailer. 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 want to hook your combination to a second trailer that has no spring brakes. This has the same value as the %%SCORE%% Variable on the Final Screen. B. you need about four times as much stopping distance at 40 mph as at 20 mph You open the emergency line shut-off valve at the rear of the last trailer and hear air escaping. Terms in this set (43) Converter dollies are used to connect: A tractor-trailer combination to another trailer. You are driving a 100 foot twin trailer combination at 50 mph. Charge the system and pump the brakes with the window down. While inspecting your converter dolly coupling, you should make sure there is _____ between the upper and lower fifth wheel. When does the "driver's manual" advise disconnecting the steering axle brakes to help B. slightly open A. allow "much more space" than is needed for ideal driving conditions to do this without wheel chocks you should: supply air to the trailer air system with the tractor and then disconnect the emergency line. 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: Hazardous materials must be placarded on all four sides of EACH Trailer. There is no obligation whatsoever. To help avoid mistakes, colors are sometimes used. C. use controlled or stab braking, The best way to stop any skid is to: A good and safe driver will always look out for ______. 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). The air lines will rupture It is important to check the height of the trailer before connecting a converter dolly to a trailer. Why should you use chocks when parking a trailer without spring brakes? If this activity does not load, try refreshing your browser. If you leave this page, your progress will be lost. You have not finished your quiz. 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. Which of these is most likely too occur? 9. When uncoupling a rear trailer, your rig should be parked in a straight line on? You must steer gently when pulling trailers. For emergency braking you should: 1. paramount to safe driving. 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. Nothing, the weight of the trailer will keep it in place, 10. Air will not be available to release the trailer spring brakes (parking brakes). They are filled by the emergency (supply) line from the tractor. You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. 1/2 to 3/4 of an inch 0000001956 00000 n C. the service brakes slowly move to the fully applied position, Some large trucks have converted or "spot" mirrors. Tips for Backing Up a Trailer Like a Pro Trucker. Safety should never take second place, so know your stuff! kingpin. All ABS equipped units some large trucks have curved (convex or spot) mirrors. Open the emergency line shut-off valve at the rear of the last trailer. 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? - Converter dolly air tank drain valve: CLOSED. What value of channel width must the design use? 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. A They provide the air pressure used to operate trailer brakes. Locking jaws closed on Safety chains secured to trailer (s). 5. A You are driving a tractor with multiple trailers. You may not notice a major leak in the service line until you try to put the brakes on. While inspecting your converter dolly coupling, you should make sure there is _______ between the upper and lower fifth wheel. 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. We wish you the best of luck in your endeavors and are pleased to be of assistance. What do you check when making a visual check of coupling? Learn more and apply here: TruckingTruth was founded by Brett Aquila (that's me! 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 A The crack the whip effect will topple the rear trailer first. Delivering to. A major leak in the emergency line will cause the tractor protection valve to close and the trailer emergency brakes to come on. Take special care when pulling two and three trailers. 0000010705 00000 n If you feel C 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 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. B The word part ferrit- means: The heavier trailer should be in the rear. Remember: The trailer air brakes are supplied with air using the emergency line (also called the supply line). A bent or damaged kingpin on a coupling should be? C. fully raised, Which of these statements about speed management and braking is true? Did you know you can fill out one quick form here on TruckingTruth and apply to several companies at once for paid CDL training? Which of these statements about the handling of doubles and triples is true? You should reduce your speed by about _____ on a wet road. Please use the form below to contact our customer service or sales team. The number and size of air tanks varies among vehicles. To do this without wheels chocks you should: Supply air to the trailer air system with the tractor and then disconnect the emergency line. However, converter dollies and trailers built before 1975 are not required to have spring brakes. the fifth wheel, so trailer is raised slightly when dolly is pushed under it. B 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. You are doing a walk around inspection of a double or triple trailer rig. You are driving a triple trailer and there is a loss of air pressure in the emergency line. D If the converter dolly is close to your semitrailer, you should wheel it into position? This will supply air to the emergency (supply) lines. If you are driving a 200-foot triple at 35 mph, what is the minimum amount of space (in seconds) that you should keep ahead of you? When does the Driver's manual say you should disable the steering axle brake? retrovirus $_____________________________$. To test the tractor protection valve, charge the trailer air brake system, turn off the engine, and You should be sure the converter dolly air tank drain valves are _____ and the pintle hook is _____. Air Storage and Drain Tanks: Air storage tanks are used to hold compressed air. When driving with more than one trailer, which trailer should be the first one behind the tractor? B. slightly raised Leave the emergency line shut-off valve closed and open the service line valve. 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. What is likely to happen? How do you check to make sure trailer height is correct before coupling? Therefore, look far ahead so you can slow down or change lanes gradually when necessary. D C. use stab or controlled braking, Which of these is true? 4. C. closed; unlatched, Which of these will result in the best control on a curve? You are doing a walkaround inspection of a double or triple trailer rig. When driving doubles or triples how should they be driven to avoid rollover or jackknifing: if you have traffic on both sides of your vehicle and something is blocking your lane, a move to the right still be best. This has the same value as the %%TIME_ALLOWED%% Variable on the Final Screen. the rig will continue moving in a straight line no matter how much the steering wheel is turned. 0000008187 00000 n True! These valves permit closing the air lines off when another trailer is not being towed. How do you check to make sure trailer height is correct before coupling? If loading fails, click here to try again. Which of these is NOT a good thing to do when driving on slippery roads? You should hear air escaping, showing the entire system is charged. The pintle hook? The driver must yield the right-of-way to other vehicles when merging and when entering a highway from an alley. True! A Try our free CDL Doubles and Triples Test Question and Answers Quiz online. Which trailer should come first behind the tractor? A. opening the air tank petcock A dolly should be pulled out from a rear trailer using? If your converter dolly has to be moved over a distance to bring it to your semitrailer, you should? B At TruckingTruth we'll help you decide if trucking is right for you and help you get your career off to a great start. You are visually checking the coupling of a converter dolly to the rear trailer. Studying and applying oneself is the only way to successfully learn the information you need to know to pass all testing required to obtain your CDL. Park the rear trailer against another trailer, chock the tires and lock the trailer 0000005733 00000 n 0000003998 00000 n When connecting the glad hands, press the two seals together with the couplers at a 90-degree angle to each other. What does the drivers manual say about how much space you should keep ahead of your truck? You shouldn't stop braking. Newer trailers have spring brakes just like trucks and truck tractors. Any vehicle, regardless of size, designed to transport 16 or more persons, including the driver. Also available in App Store & Google Play. Therefore, it is very important for safety that you use wheel chocks when you park trailers without spring brakes.
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