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C. close the shut-off valves at the rear of the first trailer and open the shut-off valves at the rear of the second trailer, To check that the converter dolly is securely coupled to the rear trailer, you should: To do this without wheel chocks you should: When uncoupling the rear semitrailer, you should lower the converter dolly landing gear: When driving a double or triple, you need more space because they: Which of these statements about emergency steering is true? 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 On a triple combination, the shutoff valves on the rear of the last trailer should be? You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. There are more things that can go wrong, and doubles/triples are less stable than other commercial vehicles. C. closed, You can release the dolly brakes by: Dont hesitate to take advantage of our practice tests in each category specific to your needs. Finsbury Pump Systems 400l (Single Stage) 5.5hp Honda Gx Petrol Engine how much space should be between the upper and lower fifth wheel? That there is some space between the upper and lower fifth wheel. 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? 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. You should NOT: You are driving a set of doubles and a set of trailer wheels goes into a skid. the trailer height is right when: the trailer will be raised slightly when the converter dolly is backed under it. B. releasing the pintle hook When turning a double or triple at an intersection, the turn often cannot be completed without swinging wide. The road is dry and the visibility is good. When the road is slippery Which is most likely to tip over: For emergency braking you should: rear brakes will not work properly. How can you test that air flows to all trailers? Pull gently against the pin of the second trailer. A converter dolly is a piece of equipment designed to allow commercial trucks, such as semi-trucks, to pull a trailer. A. the total stopping distance of a truck is the distance it takes to stop once the brakes are put on at any speed Visually check to make sure that the rear trailer is slightly lower than the center of the The trailer height is right when: The trailer will be raised slightly when the converter dolly is backed under it. You are visually checking the coupling of a converter dolly to the rear trailer. Any trailer with a reduced ground clearance 0000002636 00000 n Pickup at South Loop. Email Updates When New Articles Are Posted. Visually check to make sure that the lead trailer is slightly higher than the center of the crack-whip effect that triubkes trucks with trailers is most likely to cause a tip over when. You should NOT: You should keep at least _____ seconds of space ahead of you. On double and triple combinations, you must make sure that which of these is secure? None of the above, 2. When coupling twin trailers, you should _______ the pintle hook and secure the dolly support in the _______ position. Time used (Requires timer add on). Any items you have not completed will be marked incorrect. What value of channel width must the design use? Converter dollies have spring brakes. A turn of the glad hand attached to the hose will join and lock the couplers. Go to Section 4: Other Topics This question is in Section 4: Other Topics of our CDL Test Guide. What do you check when making a visual check of coupling? These dollies will have a yellow lamp on the left side of the dolly Questions You Should Know For Doubles And Triples 1. If the dolly is a two axle unit then 1 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. On a triple combination, the shutoff valves at the rear off the middle trailer should be? A green traffic light allows the driver to go. When inspecting a converter dolly What should you check for? You will speak with recruiters today. Connect Converter Dolly to Rear Trailer Make sure trailer brakes are locked and/or wheels chocked. 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. 0000005554 00000 n The converter dolly air tank drain valve on coupled double and triple trailers should be: When inspecting coupled doubles and triples, make sure the pintle hooks are: How can you be sure you supplied air to a second trailer? You should not hear air escaping. you are driving a set of doubles and a set of trailer wheels goes in a skid. 60607. ), a 15 year truck driving veteran, in January 2007. A Make sure trailer height is correct. The converter dolly air tank drain valve on coupled double/triple trailers should be: Closed. Open. B What is likely to happen? 0000009556 00000 n A good and safe driver will always look out for ______. When doing a walkaround inspection of a double or triple trailer, the shut-off valves should be _______ at the rear(s) of the front trailer(s) and ________ at the rear of the last trailer. PDF Doubles and triples 1. The stopping distance for a tractor trailer What is the most common foundation brake found on heavy vehicles? . Inspecting Doubles And Triples | High Road Online CDL Training D Open the emergency line shut-off valve at the rear of the last trailer. You will speak with recruiters today. 0000001375 00000 n Check them all. Your vehicle is so long that you must swing wide to make the turn. There is more chance for skids and loss of traction. On the first trailer in a set of doubles? Pintle-eye of dolly in place in pintle hook of trailer (s). If the fifth wheel on a coupling is too far forward, the tractor frame may hit? Once you have coupled your rear trailer, you should test the coupling by? door. Correct answer percentage. A truckers workspace is a small moving office Read More. A full trailer behind a truck You must steer gently when pulling trailers. A) one inch of space . You should keep at least ___ seconds of space ahead of you. Doubles and triples must be driven very smoothly to avoid rollover or jackknife. Go to the rear of the rig. 0000003998 00000 n Dobles - Triples Pruebas de prctica 3 - NJ 2023 - CristCDL.com The dolly tow bar may flip up causing bodily injury and making it very difficult to You should be sure the converter dolly air tank drain valves are _______ & the pintle hook is __________. Stay up to date on truck driving industry news. Typically depends on the axle count. When you do this, you should hear: Which of these statements about emergency steering is true? A True! which of these is not a good thing to do when driving on slippery roads? When checking the coupling system, make sure that the locking jaws are around the shank of the. To check air flows to all trailers, you should let air pressure reach normal then? Never unlock the pintle hook with the dolly still under the rear trailer. Doubles and Triples CDL Practice Test - Class A Drivers You must stop, yield to traffic and pedestrians, and only proceed when safe. Use the engine brake or speed retarder. In order to receive your Doubles and Triples endorsement, it is required that you pass the state's official CDL written Knowledge exam. B. you need about four times as much stopping distance at 40 mph as at 20 mph The rear trailer of a triple Be sure air-lines are supported and glad hands are properly connected. Double and triple trailers increase not only the operators risk of safety, but also the other motorists around him. If the spring brakes do not release when you push the trailer air supply control, check the air line connections. To do this without wheels chocks you should: Supply air to the trailer air system with the tractor and then disconnect the emergency line. 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. 1/32 to 3/32 of an inch. What do you check when making a visual check of coupling? The dolly tow bar may fly up, possibly causing injury and making it very difficult to re-couple. Clean the couplers and rubber seals before a connection is made. You will not be tested on uncoupling twins unless you want to get a double/triple trailer endorsement on your license. You should be sure the converter dolly air tank drain valves are _______ and the pintle hook is _____. Ideal for replacing a worn, leaky drain valve on a compressor. 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? Single axle converter dollies are the most common type of converter dolly used in the U.S. C-dolly The C-dolly has two separate couplings, side-by-side. your vehicle is so long that you must swing wide to make a turn. B. use only the trailer brakes With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. When checking the fifth wheel, you should make sure that it has enough? Flashcards - Doubles Tripes Test #4 - FreezingBlue In the coupling system, the locking jaws should be fixed around? unsafe slow down even further, or better yet, find a safe haven and park until the What should you check for when inspecting a converter dolly? Each trailer and converter dolly has one or more air tanks. This would be very dangerous. You can reset the test and retake it as needed. S-cam brakes are the most common style brakes on large trucks today. The dolly tow bar may fly up They provide the air pressure used to operate trailer brakes. Speed for other vehicles is often too fast for a multi-combination unit! Which of these statements about the handling of doubles and triples is true? What three methods can you use to secure a second trailer before coupling? Trucks with trailers have a dangerous crack-the-whip effect. 4. If there are no dummy couplers, the glad hands can sometimes be locked together (depending on the couplings). A. brake and downshift in a curve When you do this, you should hear: you are driving with double trailer and must use your brakes to avoid a crash. 0000010783 00000 n [California Commercial Driver Handbook] The weight of a truck: Is a major factor affecting stopping distance. The dolly tow bar may fly away, possibly causing panic, and making it very difficult during normal operation the brakes of the double/triple trailer are controlled by : which of these will result in the best control on curves? It is important to check the height of the trailer before connecting a converter dolly to a trailer. Refers to pulling two trailers at the same time, otherwise known as "pups" or "pup trailers" because they're only about 28 feet long. you should avoid traveling next to others when possible. Any trailer, 7. [California Commercial Driver Handbook] The weight of a truck: Is a major factor affecting stopping distance. Only a certified diesel mechanic can check this. 5. Like a trailer, a dolly equipped with ABS will have a yellow indicator light on the left side. If there is Pull gently against them in a low gear to make sure the brakes work. It's a fifth wheel, not a sixth wheel. When coupling twin trailers, a converter dolly is. When you're finished, check your score and results. You need to be aware of how parking lots are arranged in order to avoid a long and difficult escape. 7.3 Inspecting Doubles and Triples = Additional Things to Check During a Walkaround Inspection. 3. can and will get stuck on a raised railroad crossing. Time limit varies by state. The road is dry and visibility is good. Doubles/triples flip flop over from quick steering moves more easily than many vehicles. 3. 1/4 in. Provides a snug fit to eliminate unwanted seepage of air or water. The road is dry and visibility is good. How much space should be between the upper and lower fifth wheel? Driving doubles/triples is also more dangerous in hot and cold weather driving, as well as on mountain roads. 3. If spare tire is on converter gear (dolly), make sure it is secured. Hook dolly to front trailer. For all brakes to work on a triple combination, you must have air supply? A) closed . on kingpin. A be coupled to the rear of a tractor-trailer combination forming a hexagon bottom rig, A coupling device of one or two axles and a fifth wheel by which a semitrailer can be 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. inspection of all equipment. D Which the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the trailer. Any vehicle required by federal regulations to be placarded while transporting hazardous materials. A. closed; latched Which of the following will occur? Make sure the converter dolly air tank drain valve is closed. NPT thumbscrew style design enables easy installation. 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. B View the full article to see how to set cruise control correctly! The braking systems of double and triple trailers are different than those of straight trucks because doubles and triples. 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. Ensuring the safety of the public starts with a thorough 0000006836 00000 n A. release the spring brakes and check for movement 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. To do this without wheel chocks you should: Empty trucks: When parking your double or triple combination, you should look for a parking space There are more things that can go wrong, and doubles/triples are less stable than other commercial vehicles. 0000001775 00000 n 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. Use only the trailer brakes 6. All material on this website is copyrighted. Park on level ground, put chock on the tires, and charge the air tank. The rear trailer of a double The number of correct answers. Double and Triples Part 1 Flashcards - flashcardmachine.com Follow the procedures described later in this section. They are filled by the emergency (supply) line from the tractor. When you do this, you should hear: When only pulling one trailer, be sure the shut-off valves are all in the fully closed position. Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? 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. How much space should be between the upper and lower fifth wheels? This has the same value as the %%SCORE%% Variable on the Final Screen. Submit your email at the end of the test. You are driving a 100-feet truck with double trailers at 50 mph. If this activity does not load, try refreshing your browser. A. you can steer more quickly and safely if you hold the wheel with one hand Opening the shut off valves on the rear most trailer will ensure the lines are flowing Never, 9. kingpin, That there is grease between upper and lower fifth wheel. Pintle hook latched. Why should you use chocks when parking a trailer without spring brakes? These mirrors: make things seem smaller & further away then they really are. Doubles Triples Endorsement Test Flashcards | Quizlet Wait for air pressure to reach normal, then push in the red trailer air supply knob. Compressed air usually has some water and some compressor oil in it. 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: If not, there is a problem. Converter dolly air tank drain valve: CLOSED. Air escape from the open valve B The service brakes slowly move to the fully applied position C The emergency line valve open and release air D None of the above 4. Flashcards - Doubles Triples Test #3 - FreezingBlue B. you can almost always stop more quickly than you can turn The converter dolly air tank drain valve on coupled double and triple trailers should be: Closed. A. hand valve How To Use Cruise Control Effectively As A Truck Driver. 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. Hazardous materials must be placarded on all four sides of EACH Trailer. to re-capture it. By clicking on "Sign Up", you agree to our Terms of Use and Privacy Policy. recouple. retrovirus $_____________________________$. None Types of converter dollies. The lightest trailer CDL Doubles & Triples Practice Test 3 - Classic Mode - Trucker Country Tractor-trailers are considered combination vehicles. Contributor: Luke Nold (Experienced truck driver for 5+ years and published writer for Fleet Magazine). 0000006195 00000 n You should avoid traveling next to others when possible. How do you know if your converter dolly is equipped with antilock brakes? Explore now! These dollies will have a yellow lamp on the left side of the dolly. None of the above, 5. You will have greater length and more dead axles to pull with your drive axles than other drivers. Make a sketch that explains this phenomenon in terms of a feedback loop . Watch the wording of the question AND the answers A safe driver will look for all of the above. The Verge logo. C B. johnson bar Should the shut-off valves on the trailers be open or closed on a set of double trailers? You want to lock your combination to a second trailer that has no spring brakes. Mar 2 - Mar 3. 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: Which trailer should come first behind the tractor? 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. Once you are finished, click the button below. mTouch Quiz will automatically populate the fields below. Shut off valves are only used on trailers designed to be towed in conjunction with other trailers (doubles / triples). 2 If this lamp is illuminated and does not go out, you are driving on a slippery road during the day. you want to hook your combination to a second trailer that has no spring brakes. Locking jaws open 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 This will supply air to the emergency (supply) lines. If loading fails, click here to try again. These valves permit closing the air lines off when another trailer is not being towed. The Doubles and Triples written CDL Exam is required for your doubles and triples endorsement. 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. Once that's complete, then its an easy push back and the weather passes. Does a converter dolly have a separate air tank? - Wisdom-Advices [Flashing Signals, Traffic Signals, Chapter 5 - Signals, Signs and Pavement Markings, North Carolina Driver's Handbook], One component of the DUI sentence in the state of Tennessee is twenty-four hours of litter pick-up wearing clothing that says "I am a drunk driver." 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. In bad weather, slippery conditions and mountain driving, you must be especially careful if you drive double and triple bottoms. This is CDL Doubles and Triples Test 3in our original Classic Mode. While inspecting your converter dolly coupling, you should make sure there is _______ between the upper and lower fifth wheel. A. require shorter stopping distances than full ones 1) the first one is to pump down the air pressure in the system between 20 and 45psi (pounds per square inch) the trailer air supply will pop out, shutting air off to the trailer. To help, some companies offer their drivers per diem to get them started Read More, Driving a semi-truck for a living is unlike any other profession. Ensuring the safety of the public starts with a thorough inspection of all equipment. B. closed PDF Section 7: Doubles and Triples - CDL Study Study section 6.2 if you can't answer all of these questions. What is a converter dolly? To test the tractor protection valve, charge the trailer air brake system, turn off the engine, and True False True If you want to couple a second trailer to you combiantion vehicle, secure it by using the: Trailer emergency air brakes. Optional: Leave your email address if you would like a reply: When inspecting doubles or triples, in what position should the air shut-off valves be in? Eventually, the air will leak away, and then there will be no brakes. Make sure you have large enough gaps before entering or crossing traffic. 4. Trailer Parts Superstore - How Air Brakes Work - Eastern Marine 0000005664 00000 n Doubles and triples must be driven very smoothly to avoid rollover or jackknife. The tanks will hold enough air to allow the brakes to be used several times even if the compressor stops working. 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. Use controlled or stab braking B. What does the Driver's manual say about how much space you should keep ahead of your truck? You are doing a walk around inspection of a double or triple trailer rig. 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. The number and size of air tanks varies among vehicles. There is no obligation whatsoever. 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 . To check that the trailer emergency brakes are working properly, you should pull out the trailer air supply control and? Seriously! With the red knob pushed in on the tractor dash, the service line should have air in it. Question 4. A. countersteer 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 tells how much pressure the relay valves should send to the trailer brakes. Make sure you can hear air escaping with the valve closed. What is one function of the tractor protection valve? You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. 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. Some areas of concern are discussed below. B. open; latched This has the same value as the %%WRONG_ANSWERS%% Variable on the Final Screen. B Ship to Store. If one air system is very low on pressure _______. You are doing a walk around inspection of a double or triple trailer These valves permit closing the air lines off when another trailer is not being towed. 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. You are driving a tractor with multiple trailers. To uncouple the rear trailer in a set of doubles, the shut-off valve at the rear of the front trailer should be: Closed. When uncoupling a rear trailer, your rig should be parked in a straight line on? 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. Air Storage and Drain Tanks: Air storage tanks are used to hold compressed air. True! Before coupling a trailer, you should make sure it is at the right height using? The last trailer in a combination is most likely to turn over. What's a converter dolly? A. use the engine brake or speed retarder All rights reserved Site Map. 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 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. %PDF-1.2 % 2003-2023 Chegg Inc. All rights reserved. C. posted speed limits on curves are safe for all trucks, Empty trucks: