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. With the red knob pushed in on the tractor dash, the service line should have air in it. The shut off valves prevent air from going any further. You are driving a 100 foot twin trailer combination at 50 mph. Opening the shut off valves on the rear most trailer will ensure the lines are flowing inspection of all equipment. B This will prevent water and dirt from getting into the coupler and the air lines. A CDL is required to drive any of the following vehicles: A vehicle with two separate parts - the power unit (tractor) and the trailer. Typically depends on the axle count. Doubles and triples take up more space than other commercial vehicles. Never unlock the pintle hook with the dolly still under the rear trailer. This is CDL Doubles and Triples Test 3in our original Classic Mode. You should be sure the converter dolly air tank drain valves are _______ & the pintle hook is __________. D Like a trailer, a dolly equipped with ABS will have a yellow indicator light on the left side. When coupling twin trailers, you should _______ the pintle hook and secure the dolly support in the _______ position. 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. B. keep other traffic out of your side space 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? If a converter dolly is still under the second trailer and you unlock the pintle hook, what will probably happen? Leave the emergency line shut-off valve closed and open the service line valve. While inspecting your converter dolly coupling, you should make sure there is _____ between the upper and lower fifth wheel. The front trailer in a set of double trailers is most likely to turn over due to the Crack-the-Whip effect. If there is Pickup at South Loop. This has the same value as the %%WRONG_ANSWERS%% Variable on the Final Screen. While inspecting your converter dolly coupling, you should make sure there is _______ between the upper and lower fifth wheel. For emergency braking you should: You are doing a walk around inspection of a double or triple trailer rig. The rear trailers shut off valves should be closed and the front open to allow air to the That there is no space between upper and lower fifth wheel. which of these statements about quick steering movements and doubles/triples is true? For emergency braking you should: May have poor traction due to bouncing and wheels lockup. The driver must yield the right-of-way to other vehicles when merging and when entering a highway from an alley. 0000006836 00000 n Because of this, which of the following vehicle parts is most likely to tip over? In normal operation, trailer service brakes should be operated by? They provide the air pressure used to operate trailer brakes. How do you know if your converter dolly is equipped with antilock brakes? Any items you have not completed will be marked incorrect. A. use light, steady pressure on the brake pedal Do converter dollies have spring brakes? Ship to Store. A. make things look smaller and farther away than they really are But the brakes will hold only as long as there is air pressure in the trailer air tank. D A vehicle transporting hazardous materials is required to display placards where? P0420 code honda odyssey 2011 - pjigzp.wikifit.it 12, 3. When does the "driver's manual" advise disconnecting the steering axle brakes to help The braking systems of double and triple trailers are different than those of straight trucks because doubles and triples. A dolly should be pulled out from a rear trailer using? The emergency brakes come on whenever the air supply knob is pulled out or the trailer is disconnected. behind the shut-off valve then they need to remain open. 2003-2023 Chegg Inc. All rights reserved. This means. In order to receive your Doubles and Triples endorsement, it is required that you pass the states official CDL written Knowledge exam. They are filled by the emergency (supply) line from the tractor. C. foot pedal, Which of these statements about managing space to the sides is true? You are visually checking the coupling of a converter dolly to the rear trailer. A. use the engine brake or speed retarder Any trailer, 7. Which of the following will occur? The final procedure when connecting a rear trailer is to? Open, free Flammable materials in the front trailer then it must have the placards on that trailer. Pull gently against the pin of the second trailer. Closed, free, 8. You are doing a walk around inspection of a double or triple trailer rig. B. slow to a safe speed before entering the curve, then accelerate slightly through it What is most likely to happen if the trailer protection valve of a double or triple trailer does not function correctly? Converter dollies are connected to front trailers with a? D A low air buzzer will go off indicating something is wrong and either the front or the The Home Depot Logo 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. B You should keep at least ____ seconds of space ahead of you. When inspecting a converter dolly What should you check for? Should the shut-off valves on the trailers be open or closed on a set of double trailers? Double/Triple Flashcards | Quizlet What should you check for when inspecting a converter dolly - Answers What happens if you cross the Emergency Air Line and the Service Air Line? They are filled by the emergency (supply) line from the tractor. If spare tire is on converter gear (dolly), make sure it is secured. Which the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the trailer. 0000009577 00000 n A. hand valve If loading fails, click here to try again. These mirrors: Make things seem smaller and further away than they really are. When connecting the glad hands, press the two seals together with the couplers at a 90-degree angle to each other. Charge the system and pump the brakes with the window down. you are driving a 100ft truck eith double trailers at 50mph. You are doing a walk around inspection of a double or triple trailer Nothing, the weight of the trailer will keep it in place, 10. What do you check when making a visual check of coupling? Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? Make sure to visually inspect the fifth wheel and that the locking mechanism is You are visually checking the coupling of a converter dolly to the rear trailer. open, closed, closed: Term. D 0000006383 00000 n 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. 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. Select the answer that correctly completes each statement. A bent or damaged kingpin on a coupling should be? 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. D 2. A thorough pre-trip inspection should catch any major service line leaks before you begin your trip. What is a converter dolly? There are more things that can go wrong, and doubles/triples are less stable than other commercial vehicles. If not, there is a problem. Time limit varies by state. None A Open, latched B Open, free C Closed, latched D Closed, free 28. 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. 0000004668 00000 n 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. How do you check to make sure trailer height is correct before coupling? All ABS equipped units There are two types of converter dollies. 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 _____. if you have traffic on both sides of your vehicle and something is blocking your lane, a move to the right still be best. 3. A The rear trailers shut-off valves should be closed and the front open. A. The lighter trailer should be in the rear. 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. Only a certified diesel mechanic can check this. Never, 9. Be more careful in adverse conditions. B You must treat a flashing red signal as you would treat a STOP sign. A) one inch of space . 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. We are here to help. Also, this page requires javascript. These trailers have no parking brake. 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. Make sure you have large enough gaps before entering or crossing traffic. The air lines will rupture You will not be tested on uncoupling twins unless you want to get a double/triple trailer endorsement on your license. C. use controlled or stab braking, The best way to stop any skid is to: 1/2 to 3/4 of an inch B. johnson bar By clicking on "Sign Up", you agree to our Terms of Use and Privacy Policy. View More Details. 11 During normal operation the brakes of the double/triple trailer are controlled by: 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 heaviest trailer For emergency braking you should: C 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: "Glad hands" are coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer. Pintle-eye of dolly in place in pintle hook of trailer (s). Which of the following statements about off tracking is true? How many different ways of coupling and uncoupling trailer combinations are there? will have a lamp on the drivers side. [California Commercial Driver Handbook] The weight of a truck: Is a major factor affecting stopping distance. Locking jaws closed on Air pressure is sent from the air tanks to the brakes by relay valves. When does the Driver's manual say you should disable the steering axle brake? Open which of these statements about the handling of doubles and triples is true ? You shouldn't stop braking. Trailer Air Tanks And Shutoff Valves - Page 50. Sketch the shape of the passage between sections 1 and 2. Sometimes, metal tags are attached to the lines with the words service and emergency stamped on them. The DMV doubles triples practice test will examine your knowledge of pulling double/triple trailers, coupling and uncoupling, inspecting doubles and triples, and checking air brakes. The number and size of air tanks varies among vehicles. What should you check for when inspecting the converter dolly? Connect the Converter Dolly to the Rear Trailer: Test the coupling by pulling against the pin of the second semitrailer. Some do. What happens when there is a major leak in the emergency air line? Florida CDL Handbook | FL CDL Handbook Coupling & Uncoupling for Becoming A Truck Driver is a dream we've all pondered at some point in our lives. Any vehicle, regardless of size, designed to transport 16 or more persons, including the driver. A major leak in the emergency line will cause the tractor protection valve to close and the trailer emergency brakes to come on. Follow the procedures described later in this section. 9. A. always keep your vehicle to the right side of your lane If your converter dolly has to be moved over a distance to bring it to your semitrailer, you should? C. add "one car length for every 10 mph", Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer, Incidental Motions & Motions that Bring a Que. Any vehicle required by federal regulations to be placarded while transporting hazardous materials. A. for coupled doubles and triples, be sure that the pintle hook is in the open position A. open the shut-off valves at the rear of both trailers kingpin. There is no obligation whatsoever. B. slightly open 1/3 For example: If you are traveling 60 MPH and it begins to rain, your suggested You should be sure the converter dolly air tank drain valves are _____ and the pintle hook is ____. True! You should be sure the converter dolly air tank drain valves are _____ and the pintle hook is _____. (done) Chp 23: Cash Flow + Working Capital, Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer. Chock the tires, park on level ground and charge the trailer air tank if it does The shortest trailer You want to lock your combination to a second trailer that has no spring brakes. 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. You should check the height of the trailer before connecting a converter dolly to a second or third trailer. 0000007508 00000 n 3. Flashcards - Doubles Triples Test #3 - FreezingBlue By using this site, you agree to be bound by our Terms of Use, Privacy Policy and Cookie Policy, Copyright 2000-2023 MH Sub I, LLC dba Internet Brands. A. completely open Those that do not have spring brakes have emergency brakes that work from the air stored in the trailer air tank. Double and Triples Endorsement Flashcards The application only takes one minute. Open the emergency line shut-off valve at the rear of the last trailer. When uncoupling the converter dolly Why should you never unhook the HlTo xGf`{iIMh-x||?pbE':X4ZZZRbu7 uvi_RHUkVXBVu{^B3 4e/iw\]RE] YY7i)e V*h(++WQ-]Xm9c5yU6BS" 5HiL,[b)ee:t/ )%BVGpU7T\ZJD True or False? The trailer height is right when: The trailer will be raised slightly when the converter dolly is backed under it. What types of trailers can get stuck on raised crossings? At TruckingTruth we'll help you decide if trucking is right for you and help you get your career off to a great start. Stop the vehicle by gearing down and sparingly On the first trailer in a set of doubles? If one air system is very low on pressure _______. True False True If you want to couple a second trailer to you combiantion vehicle, secure it by using the: Trailer emergency air brakes. In order to supply air to the air tanks of a second trailer, you must ______ shut-off valves at the rear of the first trailer and ________ the shut-off valves at the rear of the second trailer. The Doubles and Triples written CDL Exam is required for your doubles and triples endorsement. Please wait while the activity loads. front of the second trailer. True! Please visit using a browser with javascript enabled. ), a 15 year truck driving veteran, in January 2007. Take special care when pulling two and three trailers. Have little braking power because they are small You should be sure the converter dolly air tank . You should keep at least _____ seconds of space ahead of you. Definition. The converter dolly air tank drain valve on coupled double/triple trailers should be: Answer: Closed. CDL Practice Tests 2023 - Doubles And Triples 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. you should avoid traveling next to others when possible. If spare tire is carried on converter gear (dolly), make sure it's secured. What should you check for when inspecting the converter dolly and the pintle hook? You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. Contributor: Luke Nold (Experienced truck driver for 5+ years and published writer for Fleet Magazine). 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? some large trucks have curved (convex or spot) mirrors. 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. You should reduce your speed by about _____ on a wet road. Submit your email at the end of the test. 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. B Provides a snug fit to eliminate unwanted seepage of air or water. Older trailers do not have spring brakes. To do this without wheels chocks you should: Supply air to the trailer air system with the tractor and then disconnect the emergency line. These mirrors: make things seem smaller & further away then they really are. You can reset the test and retake it as needed. 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 The puzzle: At the far left edge, the plates are in contact, so the path length difference between rays 222 and 333 is zero. CDL: Doubles/Triples Flashcards | Quizlet Blue is used for the service lines, and red for the emergency (supply) lines. DMV Doubles Triples Practice Test | CDL Knowledge Therefore, it is very important for safety that you use wheel chocks when you park trailers without spring brakes.
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