Visually check to make sure that the rear trailer is slightly lower than the center of the The A-dolly has a single drawbar with a single, centered hitching point. When uncoupling a rear trailer, you should remove some weight from the dolly by? When driving a truck with more than one trailer, which trailer should be first behind the truck? Doubles/triples flip flop over from quick steering moves more easily than many vehicles. How can you test that air flows to all trailers? C. fully raised, Which of these statements about speed management and braking is true? To prevent trailers from rolling over, you must steer gently and go slowly around corners, on ramps, off ramps and curves. Each trailer and converter dolly has one or more air tanks. None The converter dolly air tank drain valve on coupled double/triple trailers should be: Closed. Each tank has a drain valve on it, and you should drain each tank every day. 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. 12, 3. 3. What happens when there is a major leak in the emergency air line? The emergency brakes come on whenever the air supply knob is pulled out or the trailer is disconnected. 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. Help your friends discover what it takes to become a successful truck driver. the road is dry & visibility is good. A dolly is like a very short trailer, with a ring hitch on the front and a fifth wheel on top. That split second that you release the brakes will allow them to match the vehicles road 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. 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. _______ should be tested with the hand valve but controlled in normal operation with the foot pedal. you want to hook your combination to a second trailer that has no spring brakes. 10 There are more critical parts to check when you have two or three trailers. when driving a truck with more than one trailer, which trailer should be first behind the truck? Some do. You should keep at least _____ seconds of space ahead of you: You are driving with double trailers and must use your brakes to avoid a crash. B Locking jaws closed on Therefor, if there is a major leak in your service line, you may not know it until you try to use the service 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. Terms in this set (43) Converter dollies are used to connect: A tractor-trailer combination to another trailer. Only trailers designed to be pulled with another trailer behind it will have a shut off valve. The rear trailers shut-off valves should be closed and the front open. B. closed A. use light, steady pressure on the brake pedal When you go to the rear of the last trailer, what should you do to complete this check? Locking jaws closed on Definition. A major leak in the emergency line will cause the tractor protection valve to close and the trailer emergency brakes to come on. 11 During normal operation the brakes of the double/triple trailer are controlled by: Open the shut-off valves at the rear of the last trailer and listen for air flow. Which of these is most likely too occur? The coupling between a rear trailer and a dolly should have a space between the upper and lower fifth wheels of? 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. Stop the vehicle by gearing down and sparingly and the converter dolly air tank drain valve should be _____. . True! A major leak in the emergency line will cause the tractor protection valve to close and the trailer emergency brakes to come on. Ship to Store. Never unlock the pintle hook with the dolly still under the rear trailer. 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. Usually need a glad hand converter Which of these is most likely to occur? how can you be sure you supplied air to a second trailer? Once that's complete, then its an easy push back and the B. use only the trailer brakes In normal operation, trailer service brakes should be operated by? These dollies will have a yellow lamp on the left side of the dolly Questions You Should Know For Doubles And Triples 1. A CDL is required to drive any of the following vehicles: A vehicle with two separate parts - the power unit (tractor) and the trailer. Learn more and apply here: TruckingTruth was founded by Brett Aquila (that's me! The trailer brakes will unlock 4. 0000001162 00000 n When coupling twin trailers, a converter dolly is. It is very important to keep the air supply clean. They provide the air pressure used to operate trailer 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. The shortest trailer You are driving a 100-feet truck with double trailers at 50 mph. Make sure to visually inspect the fifth wheel and that the locking mechanism is 0000003060 00000 n What is likely to happen? Connect Converter Dolly to Front Trailer Back first semitrailer into position in front of dolly tongue. B When the road is slippery Take this same test in our other testing modes How to Get a Hazardous Materials Endorsement, What is a CDL? 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. A. you can steer more quickly and safely if you hold the wheel with one hand We are an independent company focused on providing valuable motor vehicle and permit practice test information. 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: What is the most common foundation brake found on heavy vehicles? you can fuck a pornstar craigslist cars and trucks for sale by owner; kd linear actuator kdpt007 what is ait in the army; native american spiritual cleansing prayer simple spectrum coupon code; . 0000010783 00000 n Make sure the converter dolly air tank drain valve is closed. A. use a low gear Park on level ground, put chock on the tires, and charge the air tank. Slow to the safe speed before entering, then accelerate slightly through the curve. Doubles and triples must be driven very smoothly to avoid rollover or jackknife. Many scientists are concerned that the melting of Earth's sea ice will increase Earth's surface temperature. 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. Lock pintle hook. weather passes. Wait for air pressure to reach normal, then push in the red trailer air supply knob. The pintle hook? 11 5. A dolly should be pulled out from a rear trailer using? Any trailer, 7. This means. which of these statements about managing space to the sides is true? Some vehicles have dead end or dummy couplers to which the hoses may be attached when they are not in use. 1/2 to 3/4 of an inch View the full article to see how to set cruise control correctly! Should the shut-off valves on the rear of the last trailer be open or closed? 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. B Because of this, which of the following vehicle parts is most likely to tip over? When checking the coupling system, make sure that the locking jaws are around the shank of the. Hit the article below to see specific information about AOBRDs! Park the rear trailer against another trailer, chock the tires and lock the trailer Have little braking power because they are small safe speed would be 40 MPH. When you are pulling trailers, which of the following statements is true about steering? Leave the emergency line shut-off valve closed and open the service line valve. If there is a trailer Shut off valves are only used on trailers designed to be towed in conjunction with other trailers (doubles / triples). There is more chance for skids and loss of traction. C. 3, You are doing a walk around inspection of a double or triple trailer rig. If your tanks have automatic drains, they will keep most moisture out, but you should still open the drains to make sure. None of the above, 4. Remember: The trailer air brakes are supplied with air using the emergency line (also called the supply line). There are two types of converter dollies. 0000002446 00000 n The number of correct answers. 0000006195 00000 n They are filled by the emergency (supply) line from the tractor. C. back up slightly and make a visual check of the coupling, You are driving with double trailers and must use your brakes to avoid a crash. B. you should avoid traveling next to others whenever possible A. open When coupling, be sure to couple the proper glad hands together. When does the "driver's manual" advise disconnecting the steering axle brakes to help keep the rig straight? 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. When only pulling one trailer, be sure the shut-off valves are all in the fully closed position. How should you test the coupling? Antilock Braking Systems on Converter Dollies, Converter dollies built on or after March 1, 1998, are required to have antilock brakes. mTouch Quiz will automatically populate the fields below. which of these statements about quick steering movements and doubles/triples is true? The shut off valves prevent air from going any further. What is a converter dolly? 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: The crack the whip effect that troubles trucks with trailers. Always test the trailer brakes before driving with the hand valve or by pulling the air supply (tractor protection valve) control. during normal operation the brakes of the double/triple trailer are controlled by : which of these will result in the best control on curves? Tractor-trailers are considered combination vehicles. Each trailer and converter dolly has one or more air tanks. C. posted speed limits on curves are safe for all trucks, Empty trucks: Which of the following will probably happen if you are driving a double rig and a set of trailer wheels goes into a skid? The Doubles and Triples written CDL Exam is required for your doubles and triples endorsement. A-dolly. 0000010705 00000 n Remember, the service line is not used unless you depress the brake pedal or use the trailer hand valve. A. always keep your vehicle to the right side of your lane Unless you are draining the condensation out of the air tank, then the drain valve 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? When you do this, you should hear: Trucks with trailers have a dangerous crack-the-whip effect. 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 Remember however, that is just a suggestion. ADVERTISEMENT ADVERTISEMENT a. blood The driver will be required to complete this requirement in three eight hour shifts. C. closed; unlatched, Which of these will result in the best control on a curve? A The Verge logo. This would be very dangerous. B. slightly raised This will prevent water and dirt from getting into the coupler and the air lines. 0000004668 00000 n Also, this page requires javascript. [California Commercial Driver Handbook] The weight of a truck: Is a major factor affecting stopping distance. Some areas of concern are discussed below. For emergency braking you should: When does the "driver's manual" advise disconnecting the steering axle brakes to help Converter dolly air tank drain valve: CLOSED Air lines supported and glad hands properly connected. Push the brake pedal as hard as you can and hold it there Open the emergency line shut-off valve at the rear of the last trailer. you should check the trailer height before connecting a converter dolly to a second or third trailer. 1/3 For example: If you are traveling 60 MPH and it begins to rain, your suggested 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. Which of the following statements about off tracking is true? Go to Section 4: Other Topics This question is in Section 4: Other Topics of our CDL Test Guide. 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. Delivering to. C. closed, You can release the dolly brakes by: 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. If you do, the brakes may not work correctly. A turn of the glad hand attached to the hose will join and lock the couplers. 0000010306 00000 n D With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. Compressed air usually has some water and some compressor oil in it. A. opening the air tank petcock These trailers have no parking brake. That there is no space between upper and lower fifth wheel. 2. Safety should never take second place, so know your stuff! 0000007487 00000 n You are visually checking the coupling of a converter dolly to the rear trailer. 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 When inspecting doubles and triples you must make sure there is air all the way to the back of the last trailer, otherwise what may not work? C At section 2 downstream, the speed is 519 m/s. You should reduce your speed by about _____ on a wet road. Learn more and apply here: The more heavily loaded semitrailer should be in first position behind the tractor. A truckers workspace is a small moving office Read More. B These mirrors: make things seem smaller & further away then they really are. This will supply air to the emergency (supply) lines. 7.3 Inspecting Doubles and Triples = Additional Things to Check During a Walkaround Inspection. and ensuring it is secure. Slow to a safe speed before entering the curve, then coast through the curve. Should the shut-off valves on the trailers be open or closed on a set of double trailers? B. pull gently against the pin of the second semitrailer A. What's a converter dolly? D Did you know you can fill out one quick form here on TruckingTruth and apply to several companies at once for paid CDL training? B 0000003240 00000 n Which diagram shows the best way to turn? When driving doubles or triples how should they be driven to avoid rollover or jackknifing: You must steer gently when pulling trailers. You are driving with more than one trailer. 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. That there is no space between upper and lower sixth wheel. The lightest trailer A) closed . A. fully lowered you are visually checking the coupling of a converter dolly to the rear trailer. Go to the rear of the rig. you are driving a set of doubles and a set of trailer wheels goes in a skid. A Submit your email at the end of the test. NPT thumbscrew style design enables easy installation. Once you have coupled your rear trailer, you should test the coupling by? To uncouple the rear trailer in a set of doubles, the shut-off valve at the rear of the front trailer should be: Closed. The trailer is at the correct height when. When entering a roundabout, a driver must yield the right-of-way to drivers already in the roundabout and obey all traffic signs. Sketch the shape of the passage between sections 1 and 2. to do this without wheel chocks you should: supply air to the trailer air system with the tractor and then disconnect the emergency line. Which the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the trailer. d. protein. The heavier trailer should be in the rear. which of these statements about the handling of doubles and triples is true ? 1 You are driving with double trailers and must use your brakes to avoid a crash. 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. S-cam brakes are the most common style brakes on large trucks today. Connect the Converter Dolly to the Rear Trailer: Test the coupling by pulling against the pin of the second semitrailer. If you leave this page, your progress will be lost. Charge the system and pump the brakes with the window down. To do this without wheels chocks you should: Supply air to the trailer air system with the tractor and then disconnect the emergency line. 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. The shut off valves, when in the open position, allows air to flow out to another 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 Why should you not use the trailer hand valve while driving? For emergency braking you should: A Push the brake pedal as hard as you can and hold it there B locked . However, converter dollies and trailers built before 1975 are not required to have spring brakes. Never, 9. All rights reserved Site Map. 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). can and will get stuck on a raised railroad crossing. axle will have spring brakes due to the weight of the unit. Never pull any trailer without visually inspecting the fifth wheel locking bar They are filled by the emergency (supply) line from the tractor. Doubles and triples are more likely to overturn than other combination vehicles because of the whip cracking effect. How can you be sure you supplied air to a second trailer? However there are some states that allow doubles that are each 48 feet in length. 0000001956 00000 n Pull gently against the pin of the second trailer. 2. doubles/triples flip flop over from quick steering movements more easily than many other vehicles. Contributor: Luke Nold (Experienced truck driver for 5+ years and published writer for Fleet Magazine). The weight of the individual trailers will have no noticeable effect on the handling of the vehicle, The weight of all trailers should be nearly the same, within 2% of each other. 0000006383 00000 n 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. A. allow "much more space" than is needed for ideal driving conditions You should be sure the converter dolly air tank drain valves are _______ & the pintle hook is __________. What three methods can you use to secure a second trailer before coupling? You are driving a 100 foot twin trailer combination at 50 mph. In this order, the shutoff valves at the rear of front trailers, the rear of the last trailer and the converter dolly air tank drain valve should be? 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. Safety chains should be secured to trailer(s). A converter dolly is still under the second trailer when you unlock the pintle hook. should remain in the closed position. the fifth wheel, so trailer is raised slightly when dolly is pushed under it. 0000009556 00000 n A 4. D Use the engine brake or speed retarder. 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? You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. A. countersteer 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? This has the same value as the %%TIME_USED%% Variable on the Final Screen. Seriously! 0000001775 00000 n You are doing a walk around inspection of a double or triple trailer rig. Take special care when pulling two and three trailers. Why is there still destructive interference? In order to receive your Doubles and Triples endorsement, it is required that you pass the state's official CDL written Knowledge exam. 0000006836 00000 n Double and triple trailers increase not only the operators risk of safety, but also the other motorists around him. symptoms of a bad fuel tank selector switch. To help avoid mistakes, colors are sometimes used. 0000005345 00000 n Doubles and triples take up more space than other commercial vehicles. Number of wrong answers. The dolly tow bar may flip up causing bodily injury and making it very difficult to For emergency braking you should: which of these statements about emergency steering is true? A A Commercial Drivers License Overview, Trucking Terminology and Transportation Definitions. To do this without wheel chocks you should: Empty trucks: When parking your double or triple combination, you should look for a parking space You must treat a flashing red signal as you would treat a STOP sign. Which of these is NOT a good thing to do when driving on slippery roads? You are doing a walkaround inspection of a double or triple trailer rig. Sometimes, metal tags are attached to the lines with the words service and emergency stamped on them. You have not finished your quiz. A coupling device of one or two axles and a fifth wheel by which a semitrailer can be coupled to the rear of a tractor-trailer combination forming a double bottom rig Should the shut off valves on the rear of the first trailer be open or closed on a set of double trailers? Air escape from the open valve You are driving with double trailers and must use your brakes to avoid a crash.