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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. pull gently against the pin of the second semitrailer The application only takes one minute. Terms in this set (43) Converter dollies are used to connect: A tractor-trailer combination to another trailer. Double and triple trailers increase not only the operators risk of safety, but also the other motorists around him. 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). Doubles and triples take up more space than other commercial vehicles. What is likely to happen? You must steer gently when pulling trailers. "Glad hands" are coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer. Calculate the voltage gain of each. 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: If one air system is very low on pressure _______. Doubles and triples must be driven very smoothly to avoid rollover or jackknife. 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 You should keep at least _____ seconds of space ahead of you. None of the above, 4. Chock the tires, park on level ground and charge the trailer air tank if it does B. keep other traffic out of your side space Opening the shut off valves on the rear most trailer will ensure the lines are flowing B. slightly raised 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. 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 _______. It is important not to let water and oil build up in the air tanks. If spare tire is carried on converter gear (dolly), make sure it's secured. You shouldn't stop braking. The Verge logo. The shortest trailer Which of these are the correct positions for shut-off valves in doubles and triples? When driving doubles or triples how should they be driven to avoid rollover or jackknifing: C. fully raised, Which of these statements about speed management and braking is true? ADVERTISEMENT ADVERTISEMENT Air pressure is sent from the air tanks to the brakes by relay valves. you are doing a walkaround inspection of a double or triple trailer rig. Open the emergency line shut-off valve at the rear of the last trailer. The rear trailers shut off valves should be closed and the front open to allow air to the You want to lock your combination to a second trailer that has no spring brakes. Some areas of concern are discussed below. A. the total stopping distance of a truck is the distance it takes to stop once the brakes are put on at any speed B. slightly open If you do, there is a problem. Locking jaws closed on Which of the following statements about off tracking is true? coupled to the rear of a tractor-trailer combination forming a double bottom rig, A coupling device of one or two axles and a sixth wheel by which a semitrailer can be A CDL is required to drive any of the following vehicles: A vehicle with two separate parts - the power unit (tractor) and the trailer. Open If the spring brakes do not release when you push the trailer air supply control, check the air line connections. C. use controlled or stab braking, The best way to stop any skid is to: you are driving on a slippery road during the day. Open. True! re-couple, You can if you want to, it does not matter. Close the emergency line shut-off valve at the rear of the trailer. All trademarks are property of their respective owners. If you are only pulling one trailer, make certain the valve is fully in the closed position or it will leak air out of the air system. 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 . How can you test that air flows to all trailers? The dolly tow bar may fly up, possibly causing injury and making it very difficult to re-couple. What does the Driver's manual say about how much space you should keep ahead of your truck? When driving a double or triple trailer, greater care must be given to. For emergency braking you should: Speed for other vehicles is often too fast for a multi-combination unit! You are doing a walk around inspection of a double or triple trailer rig. (done) Chp 23: Cash Flow + Working Capital, Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer. On a triple combination, the shutoff valves at the rear off the middle trailer should be? 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. 0000008166 00000 n You should NOT: B. allow one vehicle length for every 10,000 lbs of gross vehicle weight With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. Go to the rear of second trailer and open the emergency line shut-of valve. How do you check to make sure the trailer height is correct before coupling? Which is most likely to tip over: In normal operation, trailer service brakes should be operated by? You should be sure the converter dolly air tank drain valves are _______ and the pintle hook is _____. You can also reach us at (888) 830-2326. Have little braking power because they are small This is CDL Doubles and Triples Test 3in our original Classic Mode. 1/4 in. To check if the converter dolly is securely coupled to the rear trailer you should: Pull gently against the pin of the second trailer. What does the Commercial Driver Handbook say about how much space you should keep ahead of your truck? Slow to a safe speed before entering the curve, then coast through the curve. What three methods can you use to secure a second trailer before coupling? Converter dolly air tank drain valve: CLOSED. rear trailer. True False True If you want to couple a second trailer to you combiantion vehicle, secure it by using the: Trailer emergency air brakes. 0000001107 00000 n The rear trailer of a triple You are visually checking the coupling of a converter dolly to the rear trailer. This has the same value as the %%PERCENTAGE%% Variable on the Final Screen. 1 Therefore, look far ahead so you can slow down or change lanes gradually when necessary. which of these statements about quick steering movements and doubles/triples is true? 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. 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. CDL Doubles and Triples Test Question and Answers 2023 [PDF]: Commercial Drivers License Doubles and Triples Endorsements Knowledge Test. B View the full article to see how to set cruise control correctly! On a triple combination, the shutoff valves on the rear of the last trailer should be? D 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? This will prevent water and dirt from getting into the coupler and the air lines. What is a converter dolly? TestPermit.com is not affiliated, endorsed, or sponsored by state agencies or any motor vehicle and any other departments in the United States, Canada, UK. Provides a snug fit to eliminate unwanted seepage of air or water. Slow to the safe speed before entering, then accelerate slightly through the curve. you are driving a set of doubles and a set of trailer wheels goes in a skid. There are two types of converter dollies. Should the shut off valves on the rear of the first trailer be open or closed on a set of double trailers? To check that the trailer emergency brakes are working properly, you should pull out the trailer air supply control and? Dont hesitate to take advantage of our practice tests in each category specific to your needs. Locking jaws closed on Did you know you can fill out one quick form here on TruckingTruth and apply to several companies at once for paid CDL training? None of the above, 5. B. you should avoid traveling next to others whenever possible This has the same value as the %%WRONG_ANSWERS%% Variable on the Final Screen. When you turn with the tractor/triple trailer combination the wheels that off-track (cheat) the most are: You should check trailer height before connecting a converter dolly to a second or third trailer. The best way to keep brakes from getting to hot while going down long grades is to: Go slow and use only light, steady pressure on the brakes. Air will not be available to release the trailer spring brakes (parking brakes). If you leave this page, your progress will be lost. can and will get stuck on a raised railroad crossing. The dolly tow bar may fly up, possibly causing injury, and making it very difficult to Which of these is the correct answer? What should you check for when inspecting a converter dolly? A. for coupled doubles and triples, be sure that the pintle hook is in the open position It is important to check the height of the trailer before connecting a converter dolly to a trailer. The heavier trailer should be in the rear. The air lines will rupture A. always keep your vehicle to the right side of your lane Usually need a glad hand converter Hb```f``b`c``e@ (Q6_* 3. By clicking on "Sign Up", you agree to our Terms of Use and Privacy Policy. Page 7-6 Commercial Driver's Manual/2.0 = Be sure air lines are supported and glad hands are properly connected. mTouch Quiz will automatically populate the fields below. The converter dolly air tank drain valve on coupled double/triple trailers should be: Closed. should remain in the closed position. You are driving a 100 foot twin trailer combination at 50 mph. Which of the following will occur? Study section 6.2 if you can't answer all of these questions. Closed, free, 8. Join 50,000+ users around America to get your Commercial Driver License today! A green traffic light allows the driver to go. 0000005345 00000 n The road is dry and visibility is good. 2) the second test is to go out to the trailer to ensure that the parking brakes have indeed applied. The braking systems of double and triple trailers are different than those of straight trucks because doubles and triples. 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. Otherwise, the dolly tow bar may fly up, possibly causing injury and making it very difficult to re-couple. 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. Remember however, that is just a suggestion. What is a converter dolly? True! How do you check to make sure trailer height is correct before coupling? New! Because of this, which of the following vehicle parts is most likely to tip over? Did you know you can fill out one quick form here on TruckingTruth and apply to several companies at once for paid CDL training? Question 4. When coupling twin trailers, a converter dolly is. What does the drivers manual say about how much space you should keep ahead of your truck? Which of these statements about managing space to the sides is true? How should you test the coupling? You are doing a walk around inspection of a double or triple trailer rig. When you do this, you should hear: Which of these is most likely to occur? you are driving at night and you must dim your headlights for traffic. 0000004668 00000 n 0000008894 00000 n A turn of the glad hand attached to the hose will join and lock the couplers. safe speed would be 40 MPH. 27. This has the same value as the %%SCORE%% Variable on the Final Screen. 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. A major leak in the emergency line will cause the tractor protection valve to close and the trailer emergency brakes to come on. You must stop, yield to traffic and pedestrians, and only proceed when safe. When uncoupling a rear trailer, you should remove some weight from the dolly by? What do you check when making a visual check of coupling? If the converter dolly is close to your semitrailer, you should wheel it into position? then there is a problem with the ABS system. Which of these is NOT a good thing to do when driving on slippery roads? When uncoupling doubles or triples, what is important to know about unlocking the pintle hook? 11 If you do, the brakes may not work correctly. You are driving with more than one trailer. A. fully lowered A 0000004689 00000 n What happens if you cross the Emergency Air Line and the Service Air Line? . B This will supply air to the emergency (supply) lines. The A-dolly has a single drawbar with a single, centered hitching point. A Eventually, the air will leak away, and then there will be no brakes. You are visually checking the coupling of a converter dolly to the rear trailer. [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." Mar 2 - Mar 3. 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. 2. That there is no space between upper and lower fifth wheel. A. use light, steady pressure on the brake pedal The road is dry and the visibility is good. Visually check to make sure that the lead trailer is slightly higher than the center of Time limit varies by state. 0000001956 00000 n Some large trucks have curved (convex or spot) mirrors. For emergency braking you should: You are doing a walk around inspection of a double or triple trailer rig. 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. Which is most likely to tip over: What three methods can you use to secure a second trailer before coupling? Which of the following is true about loading cargo into double or triple trailers? For emergency braking you should: How can you be sure you supplied air to a second trailer? There is a school zone ahead. Should the converter dolly air-tank drain valve be open or closed on a double trailer combination? 21 0 obj << /Linearized 1 /O 23 /H [ 1162 213 ] /L 29759 /E 11109 /N 7 /T 29221 >> endobj xref 21 38 0000000016 00000 n you want to hook your combination to a second trailer that has no spring brakes. 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. Follow the procedures described later in this section. The emergency brakes come on whenever the air supply knob is pulled out or the trailer is disconnected. Secure converter gear support in raised position. Do converter dollies have spring brakes? which of these is not a good thing to do when driving on slippery roads? Becoming A Truck Driver is a dream we've all pondered at some point in our lives. A low air buzzer will go off indicating something is wrong and either the front or the How much space should be between the upper and lower fifth wheel? Your tractor protection valve control should pop out, or go from normal to emergency position, when air pressure falls into what range? If spare tire is on converter gear (dolly), make sure it is secured. Make sure you do not get in a spot you cannot pull straight through. Ship to Store. These mirrors: 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 should keep atleast __seconds of space ahead of you. 0000007032 00000 n Locking jaws open 0000003261 00000 n Use the dummy couplers when the air lines are not connected to a trailer. 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 Converter dollies: They are filled by the emergency (supply) line from the tractor. The coupling between a rear trailer and a dolly should have a space between the upper and lower fifth wheels of? 2 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. More driving knowledge, questions and answers, online practice tests for obtaining a drivers . When entering a roundabout, a driver must yield the right-of-way to drivers already in the roundabout and obey all traffic signs. C Newer trailers have spring brakes just like trucks and truck tractors. dress gifs. Air pressure is sent from the air tanks to the brakes by relay valves. Contributor: Luke Nold (Experienced truck driver for 5+ years and published writer for Fleet Magazine). Nothing, the weight of the trailer will keep it in place, 10. C. the service brakes slowly move to the fully applied position, Some large trucks have converted or "spot" mirrors. This has the same value as the %%TIME_USED%% Variable on the Final Screen. Take special care when pulling two and three trailers. Why should you use chocks when parking a trailer without spring brakes? A vehicle transporting hazardous materials is required to display placards where? All ABS equipped units How much space should be between the upper and lower fifth wheels? A. closed; latched You need to stop braking because it's necessary for you to speed up, When you are in a drive-wheel braking skid, the first thing to do is STOP BRAKING! If your tanks have automatic drains, they will keep most moisture out, but you should still open the drains to make sure. 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 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.