Make sure trailer height is correct. D. Make sure the spare tire is secured, if it has one. You are driving a 100-feet truck with double trailers at 50 mph. 0000007508 00000 n 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. [California Commercial Driver Handbook] The weight of a truck: Is a major factor affecting stopping distance. 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. Should the shut-off valves on the trailers be open or closed on a set of double trailers? Converter dolly air tank drain valve: CLOSED. 3. Why should you use chocks when parking a trailer without spring brakes? 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. If one air system is very low on pressure _______. What types of trailers can get stuck on raised crossings? 8. The road is dry, and visibility is good. To check if the converter dolly is securely coupled to the rear trailer you should: Pull gently against the pin of the second trailer. S-cam brakes are the most common style brakes on large trucks today. Secure converter gear support in raised position. There is a school zone ahead. Did you know you can fill out one quick form here on TruckingTruth and apply to several companies at once for paid CDL training? The heavier trailer should be in the rear. However, converter dollies and trailers built before 1975 are not required to have spring brakes. you should keep atleast __seconds of space ahead of you. Tractor-trailers are considered combination vehicles. For emergency braking you should: You are doing a walk around inspection of a double or triple trailer rig. When the road is dry The last trailer in a combination is most likely to turn over. some large trucks have curved (convex or spot) mirrors. How many different ways of coupling and uncoupling trailer combinations are there? [Penalties Applying to Any DUI Conviction; Driving Under the Influence of Drugs or Alcohol (The "DUI" Law); Section B-7 Alcohol, Other Drugs and Driving; Tennessee Comprehensive Driver License Manual]. If it goes low enough, the trailer emergency brakes will come on. Which of these is most likely too occur? Some vehicles have dead end or dummy couplers to which the hoses may be attached when they are not in use. B. are the easiest to stop since there is no shifting cargo None of the above, 4. "Glad hands" are coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer. Blue is used for the service lines, and red for the emergency (supply) lines. This would be very dangerous. If your tanks have automatic drains, they will keep most moisture out, but you should still open the drains to make sure. Typically depends on the axle count. Types of converter dollies. to re-capture it. 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 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. 0000010705 00000 n You are driving a 100-feet truck with double trailers at 30 mph. When you do this, you should hear: 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. It's a fifth wheel, not a sixth wheel. The crack the whip effect will topple the rear trailer first. D mTouch Quiz will automatically populate the fields below. Which of these is most likely to occur? A. always keep your vehicle to the right side of your lane D When coupling, be sure to couple the proper glad hands together. when driving a truck with more than one trailer, which trailer should be first behind the truck? converting it into two trailers, A coupling device of three or four axles and a fifth wheel by which a semitrailer can 60607. When checking the coupling system, make sure that the locking jaws are around the shank of the. C. the service brakes slowly move to the fully applied position, Some large trucks have converted or "spot" mirrors. Which of these are the correct positions for shut-off valves in doubles and triples? For emergency braking you should: May have poor traction due to bouncing and wheels lockup. It is important to check the height of the trailer before connecting a converter dolly to a trailer. A converter dolly is still under the second trailer when you unlock the pintle hook. The puzzle: At the far left edge, the plates are in contact, so the path length difference between rays 222 and 333 is zero. 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 On double and triple combinations, you must make sure that which of these is secure? If there are no dummy couplers, the glad hands can sometimes be locked together (depending on the couplings). Hit the article to see the way to back up your trailer like a pro! When you do this, you should hear: Which of these statements about emergency steering is true? When only pulling one trailer, be sure the shut-off valves are all in the fully closed position. B. keep other traffic out of your side space The converter dolly air tank drain valve on coupled double and triple trailers should be: Closed. What happens if you cross the Emergency Air Line and the Service Air Line? The driver will be required to complete this requirement in three eight hour shifts. Close the emergency line shut-off valve at the rear of the trailer. A vehicle transporting hazardous materials is required to display placards where? 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. The lighter trailer should be in the rear. 0000010783 00000 n 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. You must steer gently when pulling trailers. The trailer is at the correct height when. 0000004689 00000 n 9 Questions You Must Ask, Decide if Truck Driving is The Correct Career Path, Do Not Sell or Share My Personal Information. Please use the form below to contact our customer service or sales team. A. the total stopping distance of a truck is the distance it takes to stop once the brakes are put on at any speed C 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? Light cords firmly in sockets on trailer. Submit your email at the end of the test. Once you are finished, click the button below. This has the same value as the %%WRONG_ANSWERS%% Variable on the Final Screen. This has the same value as the %%PERCENTAGE%% Variable on the Final Screen. the rig will continue moving in a straight line no matter how much the steering wheel is turned. 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 C. 3, You are doing a walk around inspection of a double or triple trailer rig. The road is dry and the visibility is good. For emergency braking you should: The lightest trailer All other trailer air functions use the emergency line. Go to Section 4: Other Topics This question is in Section 4: Other Topics of our CDL Test Guide. For emergency braking you should: which of these statements about emergency steering is true? To do this without wheel chocks you should: Empty trucks: When parking your double or triple combination, you should look for a parking space We'll help you make the right choices and prepare for a great start to your trucking career. c. iron The shut off valves, when in the open position, allows air to flow out to another trailer. 5. B Otherwise, the dolly tow bar may fly up, possibly causing injury and making it very difficult to re-couple. You must steer gently when pulling trailers. dress gifs. A. make things look smaller and farther away than they really are These trailers have no parking brake. You must stop, yield to traffic and pedestrians, and only proceed when safe. The number of correct answers. the crack-whip effect that triubkes trucks with trailers is most likely to cause a tip over when. Which is most likely to tip over: A. open A major leak in the emergency line will cause the tractor protection valve to close and the trailer emergency brakes to come on. Locking jaws closed on 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 A C The dolly tow bar may fly up, possibly causing injury and making it very difficult to re-couple. 0000001775 00000 n 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. 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. The pressure in the service line tells how much pressure the relay valves should send to the trailer brakes. 12, 3. You have not finished your quiz. 0000002636 00000 n The heaviest trailer What is most likely to happen if the trailer protection valve of a double or triple trailer does not function correctly? open, closed, closed: Term. Eventually, the air will leak away, and then there will be no brakes. These dollies will have a yellow lamp on the left side of the dolly. On a triple combination, the shutoff valves at the rear off the middle trailer should be? can and will get stuck on a raised railroad crossing. A. allow "much more space" than is needed for ideal driving conditions Make sure you do not get in a spot you cannot pull straight through. Should the converter dolly air-tank drain valve be open or closed on a double trailer combination? All of the above, 6. Opening the shut off valves on the rear most trailer will ensure the lines are flowing 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. 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 _____. Visually check to make sure that the lead trailer is slightly higher than the center of You should keep at least _____ seconds of space ahead of you. These valves permit closing the air lines off when another trailer is not being towed. When uncoupling, you should never unlock the _______ with the dolly still under the rear trailer. Push the brake pedal as hard as you can and hold it there when does the drivers manual say you should disable the steering axle brakes? A green traffic light allows the driver to go. A. The emergency brakes come on whenever the air supply knob is pulled out or the trailer is disconnected. How can you test that air flows to all trailers? C. always keep your vehicle to the left side of your lane, When testing the coupling of double trailers, the landing gear of the rear trailer should be: Either the front or the rear brakes will not work properly or fully. 2. The rear trailer of a triple Email Updates When New Articles Are Posted. securely fastened. C Take this same test in our other testing modes How to Get a Hazardous Materials Endorsement, What is a CDL? To test the tractor protection valve, charge the trailer air brake system, turn off the engine, and weather passes. 0000005345 00000 n The Doubles and Triples written CDL Exam is required for your doubles and triples endorsement. The driver must yield the right-of-way to other vehicles when merging and when entering a highway from an alley. 0000010306 00000 n When you do this, you should hear: Ais escape from the open valve. Any vehicle required by federal regulations to be placarded while transporting hazardous materials. 0000001956 00000 n When you go to the rear of the last trailer, what should you do to complete this check? You are doing a walk around inspection of a double or triple trailer rig. rear brakes will not work properly. You should be sure the converter dolly air tank drain valves are _______ and the pintle hook is _____. True! A full trailer behind a truck A Commercial Drivers License Overview, Trucking Terminology and Transportation Definitions. unsafe slow down even further, or better yet, find a safe haven and park until the 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. This has the same value as the %%SCORE%% Variable on the Final Screen. [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." paramount to safe driving. Safety fail-safe features of a tractor-trailer converter dolly. 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 _______. 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 . you are driving at night and you must dim your headlights for traffic. 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. C. When coupling doubles and triples, be sure that the pintle-eye of the dolly is in place in the pintle hook of the trailer, You are driving on a slippery road during the day. 0000005664 00000 n View More Details. Air valves should be closed on all trailers, Air valves should be open on all trailers, Rear of front trailers: closed, rear of last trailer: open, Rear of front trailers: open, rear of last trailer: closed. Make sure you can hear air escaping with the valve closed. Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? When coupling twin trailers, a converter dolly is. This will prevent water and dirt from getting into the coupler and the air lines. How do you know if your converter dolly is equipped with antilock brakes? High Road 2.0! What happens when there is a major leak in the emergency air line? 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. You are driving with double trailers and must use your brakes to avoid a crash. Which of these statements about the handling of doubles and triples is true? 0000009556 00000 n The couplers have a rubber seal that prevents air from escaping. When you do this, you should hear: Converter dolly air tank drain valve: CLOSED. If the spring brakes do not release when you push the trailer air supply control, check the air line connections. Stop the vehicle by gearing down and sparingly The word part ferrit- means: 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: B the fifth wheel, so trailer is raised slightly when dolly is pushed under it. They provide the air pressure used to operate trailer brakes. If you do, there is a problem. 0000003977 00000 n You should hear air escaping, showing the entire system is charged. Also available in App Store & Google Play. There is no obligation whatsoever. 0000003261 00000 n This has the same value as the %%TIME_USED%% Variable on the Final Screen. rear trailer. Calculate the Mach number at section 2. Hook dolly to front trailer. Unless you are draining the condensation out of the air tank, then the drain valve For emergency braking you should: A. closed; latched 7. Usually need a glad hand converter Hazardous materials must be placarded on all four sides of EACH Trailer. Contributor: Luke Nold (Experienced truck driver for 5+ years and published writer for Fleet Magazine). Time used (Requires timer add on). Delivering to. This means. Go to the rear of second trailer and open the emergency line shut-of valve. To prevent trailers from rolling over, you must steer gently and go slowly around corners, on ramps, off ramps and curves. C. engaging the tractor valve protection control, You must drive through deep or flowing water. 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. 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When connecting the glad hands, press the two seals together with the couplers at a 90-degree angle to each other. 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? Air will not be available to release the trailer spring brakes (parking brakes). It is very important to keep the air supply clean. you want to hook your combination to a second trailer that has no spring brakes. symptoms of a bad fuel tank selector switch. Which diagram shows the best way to turn? B. slightly open B. How can you test that air flows to all trailers? D You are driving a triple trailer and there is a loss of air pressure in the emergency line. B. you need about four times as much stopping distance at 40 mph as at 20 mph The road is dry and visibility is good. A good and safe driver will always look out for ______. B. open; latched Speed for other vehicles is often too fast for a multi-combination unit! Each trailer and converter dolly has one or more air tanks. recouple. All rights reserved Site Map. What should you check for when inspecting the converter dolly? Only a certified diesel mechanic can check this. You can also reach us at (888) 830-2326. A 1/32 to 3/32 of an inch. 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 B. slightly raised during normal operation the brakes of the double/triple trailer are controlled by : which of these will result in the best control on curves? You should keep at least ____ seconds of space ahead of you. Seriously! 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. The braking systems of double and triple trailers are different than those of straight trucks because 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. Be more careful in adverse conditions. Connect Converter Dolly to Front Trailer Back first semitrailer into position in front of dolly tongue. You are doing a walkaround inspection of a double or triple trailer rig. Never unlock the pintle hook with the dolly still under the rear trailer. A) closed . What three methods can you use to secure a second trailer before coupling? B. you should avoid traveling next to others whenever possible These valves permit closing the air lines off when another trailer is not being towed. 1/3 For example: If you are traveling 60 MPH and it begins to rain, your suggested Locking jaws closed on There are more critical parts to check when you have two or three trailers. %PDF-1.2 % Visually check to make sure that the rear trailer is slightly lower than the center of the Never, 9. 9. Slow to a safe speed before entering the curve, then coast through the curve. Time limit varies by state. When driving with more than one trailer, which trailer should be the first one behind the tractor? Which of the following will occur? HlTo xGf`{iIMh-x||?pbE':X4ZZZRbu7 uvi_RHUkVXBVu{^B3 4e/iw\]RE] YY7i)e V*h(++WQ-]Xm9c5yU6BS" 5HiL,[b)ee:t/ )%BVGpU7T\ZJD B. releasing the pintle hook You are driving a 100 ft twin trailer combination at 50 mph. speed and start spinning again, in turn stopping your skid, All the listed answers would be correct. A Open, latched B Open, free C Closed, latched D Closed, free 28. A Allow more following distance. you should avoid traveling next to others when possible. - Converter dolly air tank drain valve: CLOSED. Air pressure is sent from the air tanks to the brakes by relay valves. The coupling between a rear trailer and a dolly should have a space between the upper and lower fifth wheels of? 0000006383 00000 n Before you can supply air to the air tanks of a second trailer you need to: Open the shut-off valves at the rear of the first trailer and close the shut-off valves at the rear of second trailer. which of these is not a good thing to do when driving on slippery roads?