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Trucks with trailers have a dangerous crack-the-whip 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. A. you can steer more quickly and safely if you hold the wheel with one hand Open the emergency line shut-off valve at the rear of the last trailer. 8. Time limit varies by state. You are doing a walk around inspection of a double or triple trailer rig. Tractor-trailers are considered combination vehicles. D. Make sure the spare tire is secured, if it has one. The word part ferrit- means: Any vehicle, regardless of size, designed to transport 16 or more persons, including the driver. Once that's complete, then its an easy push back and the We are an independent company focused on providing valuable motor vehicle and permit practice test information. Many scientists are concerned that the melting of Earth's sea ice will increase Earth's surface temperature. C Make sure you do not get in a spot you cannot pull straight through. 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: To do this without wheel chocks you should: Empty trucks: When parking your double or triple combination, you should look for a parking space It depends on the load paramount to safe driving. The A-dolly has a single drawbar with a single, centered hitching point. 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: Types of converter dollies. You should not hear air escaping. Flammable materials in the front trailer then it must have the placards on that trailer. A. use the engine brake or speed retarder TestPermit.com provides free unofficial review materials for a variety of exams. 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? 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. Clean the couplers and rubber seals before a connection is made. The service brakes slowly move to the fully applied position Do converter dollies have spring brakes? if you have traffic on both sides of your vehicle and something is blocking your lane, a move to the right still be best. 0000002636 00000 n 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. Time used (Requires timer add on). B You must treat a flashing red signal as you would treat a STOP sign. You wish to turn right from one two-lane, two-way street to another. How do you know if your converter dolly is equipped with antilock brakes? Open, latched Compressed air usually has some water and some compressor oil in it. For emergency braking you should: 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 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. This is CDL Doubles and Triples Test 3in our original Classic Mode. A The road is dry and the visibility is good. The shut off valves prevent air from going any further. Learn more and apply here: TruckingTruth was founded by Brett Aquila (that's me! you are driving a 100ft truck eith double trailers at 50mph. These dollies will have a yellow lamp on the left side of the dolly. you want to hook your combination to a second trailer that has no spring brakes. True False True If you want to couple a second trailer to you combiantion vehicle, secure it by using the: Trailer emergency air brakes. Often do not have spring brakes Pintle-eye of dolly in place in pintle hook of trailer (s). A. air escape from the open valve This has the same value as the %%TOTAL%% Variable on the Final Screen. Submit your email at the end of the test. There is no obligation whatsoever. 0000001162 00000 n What is the most common foundation brake found on heavy vehicles? A. open 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? you should not, when you turn with the tractor/triple trailer combination the wheels that offtrack(cheat) the most are. You need to be aware of how parking lots are arranged in order to avoid a long and difficult escape. Each trailer and converter dolly has one or more air tanks. 4. You will not be tested on uncoupling twins unless you want to get a double/triple trailer endorsement on your license. Newer trailers have spring brakes just like trucks and truck tractors. If your tractor protection valve doesn't work properly, then if an air hose starts to leak what could happen? Which is most likely to tip over: You are visually checking the coupling of a converter dolly to the rear trailer. 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. Safety chains should be secured to trailer(s). 9 you are visually checking the coupling of a converter dolly to the rear trailer. Otherwise, the dolly tow bar may fly up, possibly causing injury and making it very difficult to re-couple. the converter dolly air tank drain valve on couple double/triple trailers should be: to check if the converter dolly is securely coupled to the rear trailer you should: pull gently against the pin of the second trailer. Converter dollies have spring brakes. S-cam brakes are the most common style brakes on large trucks today. The number of correct answers. 0000005664 00000 n ), a 15 year truck driving veteran, in January 2007. Related Question Question: What does this sign mean? the fifth wheel, so trailer is raised slightly when dolly is pushed under it. Close the emergency line shut-off valve at the rear of the trailer. B That there is some space between the upper and lower fifth wheel. You are driving a triple trailer and there is a loss of air pressure in the emergency line. When checking your air lines, they must be secure and? By clicking on "Sign Up", you agree to our Terms of Use and Privacy Policy. Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? We wish you the best of luck in your endeavors and are pleased to be of assistance. to do this without wheel chocks you should: supply air to the trailer air system with the tractor and then disconnect the emergency line. On the middle trailer of a set of triples? What three methods can you use to secure a second trailer before coupling? Learn more and apply here: The more heavily loaded semitrailer should be in first position behind the tractor. These mirrors: Make things seem smaller and further away than they really are. Open, free You should keep at least ___ seconds of space ahead of you. B. the emergency line valve open and release air Slow to a safe speed before entering the curve, then coast through the curve. which of these is not a good thing to do when driving on slippery roads? It is very important to keep the air supply clean. 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. The dolly tow bar may fly up Should I Be A Truck Driver? When only pulling one trailer, be sure the shut-off valves are all in the fully closed position. safe speed would be 40 MPH. Take this same test in our other testing modes How to Get a Hazardous Materials Endorsement, What is a CDL? A. closed; latched you are driving on a slippery road during the day. A 0000001775 00000 n All of the above, 6. Watch the wording of the question AND the answers A safe driver will look for all of the above. 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. 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. Ensuring the safety of the public starts with a thorough 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. The trailer brakes will unlock 2. You should keep at least _____ seconds of space ahead of you. Correct answer percentage. 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. If a converter dolly is still under the second trailer and you unlock the pintle hook, what will probably happen? B. you need about four times as much stopping distance at 40 mph as at 20 mph Did you know you can fill out one quick form here on TruckingTruth and apply to several companies at once for paid CDL training? Like a trailer, a dolly equipped with ABS will have a yellow indicator light on the left side. open, closed, closed: Term. Make sure you have large enough gaps before entering or crossing traffic. Converter dolly air tank drain valve: CLOSED. Opening the shut off valves on the rear most trailer will ensure the lines are flowing 0000001354 00000 n You can find it here: High Road 2.0. A. hand valve Chock the tires, park on level ground and charge the trailer air tank if it does Air Storage and Drain Tanks: Air storage tanks are used to hold compressed air. The trailer is at the correct height when. You should be sure the converter dolly air tank drain valves are _______ & the pintle hook is __________. Sketch the shape of the passage between sections 1 and 2. 2. A 360 degree area of awareness is 27. Pull gently against the pin of the second 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 0000003998 00000 n What is a converter dolly? A. brake and downshift in a curve 0000001375 00000 n They are filled by the emergency (supply) line from the tractor. Converter dollies: "Glad hands" are coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer. When uncoupling a rear trailer, you should remove some weight from the dolly by? The dolly tow bar may fly up, possibly causing injury and making it very difficult to re-couple. You will speak with recruiters today. You should NOT: You are driving a set of doubles and a set of trailer wheels goes into a skid. 0000010783 00000 n Why should you use chocks when parking a trailer without spring brakes? A major leak in the emergency line will cause the tractor protection valve to close and the trailer emergency brakes to come on. Do converter dollies have 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. Air will not be available to release the trailer spring brakes (parking brakes). A good and safe driver will always look out for ______. When driving a truck with more than one trailer, which trailer should be first behind the truck? How To Use Cruise Control Effectively As A Truck Driver. 0000008894 00000 n Air pressure is sent from the air tanks to the brakes by relay valves. If loading fails, click here to try again. These valves permit closing the air lines off when another trailer is not being towed. Doubles/triples flip flop over from quick steering moves more easily than many vehicles. Older trailers do not have spring brakes. Explore now! What does the drivers manual say about how much space you should keep ahead of your truck? 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. Hook dolly to front trailer. Secure converter gear support in raised position. You can also reach us at (888) 830-2326. A C C. 3, You are doing a walk around inspection of a double or triple trailer rig. 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.