Chock the tires, park on level ground and charge the trailer air tank if it does D You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. For emergency braking you should: The pintle hook should always be secure when the vehicle is in motion. Converter dollies: 0000006015 00000 n The front trailer in a set of double trailers is most likely to turn over due to the Crack-the-Whip effect. This has the same value as the %%PERCENTAGE%% Variable on the Final Screen. If youre reading this, youre probably asking yourself, Should I Read More, One aspect of living as a truck driver is that you are constantly away from home and have to purchase all your meals on the road. The individual voltage gains of the first two stages are to be equal, while the gain of the third is to be one-fourth of each of the first two. None Leave the emergency line shut-off valve closed and open the service line valve. Which of these statements about quick steering movements and doubles/triples is true? How much space should be between the upper and lower fifth wheel? What types of trailers can get stuck on raised crossings? Never unlock the pintle hook with the dolly still under the rear trailer. retrovirus $_____________________________$. some large trucks have curved (convex or spot) mirrors. When you do this, you should hear: Ais escape from the open valve. when does the drivers manual say you should disable the steering axle brakes? For emergency braking you should: which of these statements about managing space to the sides is true? Our normal business hours are Monday-Friday 8 a.m. to 5 p.m. (Pacific Time). 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! Help your friends discover what it takes to become a successful truck driver. Hb```f``b`c``e@ (Q6_* weather passes. 0000003240 00000 n Which of these is most likely too occur? They are filled by the emergency (supply) line from the tractor. Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? Did you know you can fill out one quick form here on TruckingTruth and apply to several companies at once for paid CDL training? C. engaging the tractor valve protection control, You must drive through deep or flowing water. 0000010306 00000 n The braking systems of double and triple trailers are different than those of straight trucks because doubles and triples. Flammable materials in the front trailer then it must have the placards on that trailer. For emergency braking you should: A Push the brake pedal as hard as you can and hold it there B This will let the rear wheels roll again and keep the rear wheels from sliding. 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? 0000006836 00000 n B True! 0000001162 00000 n Time limit varies by state. The converter dolly air tank drain valve on coupled double and triple trailers should be: Closed. Which the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the trailer. Ship to Store. Each trailer and converter dolly has one or more air tanks. This has the same value as the %%TIME_ALLOWED%% Variable on the Final Screen. To test the tractor protection valve, charge the trailer air brake system, turn off the engine, and 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. Any items you have not completed will be marked incorrect. Time used (Requires timer add on). In a certain electronic device, a three-stage amplifier is desired, whose overall voltage gain is 42 dB. You should avoid traveling next to others when possible. 0000004689 00000 n When uncoupling doubles or triples, what is important to know about unlocking the pintle hook? Safety fail-safe features of a tractor-trailer converter dolly. 0000008894 00000 n You MUST have air all the way to the back for all the brakes to work. You should NOT: You are driving a set of doubles and a set of trailer wheels goes into a skid. Seriously! When only pulling one trailer, be sure the shut-off valves are all in the fully closed position. 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. 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. The crack the whip effect that troubles trucks with trailers. 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 Pintle hook latched. You should be sure the converter dolly air tank drain valves are _____ and the pintle hook is _____. you should keep atleast __seconds of space ahead of you. Stay up to date on truck driving industry news. Please use the form below to contact our customer service or sales team. 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. Pull gently against the pin of the second trailer. . 2. How To Use Cruise Control Effectively As A Truck Driver. B. open; latched If one air system is very low on pressure _______. Why is there still destructive interference? At TruckingTruth we'll help you decide if trucking is right for you and help you get your career off to a great start. which of these is not a good thing to do when driving on slippery roads? Closed, latched The road is dry and visibility is good. 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. . All of the above, 6. 0000009577 00000 n you are driving a 100ft truck eith double trailers at 50mph. 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: Often do not have spring brakes Each trailer and converter dolly has one or more air tanks. The A-dolly has a single drawbar with a single, centered hitching point. The rear trailers shut-off valves should be closed and the front open. You must stop, yield to traffic and pedestrians, and only proceed when safe. Once that's complete, then its an easy push back and the If the spring brakes do not release when you push the trailer air supply control, check the air line connections. B. 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 B. closed front of the second trailer. In normal operation, trailer service brakes should be operated by? 2. You should keep at least ___ seconds of space ahead of you. When driving a double or triple trailer, greater care must be given to. Make sure you can hear air escaping with the valve closed. If the dolly is a two axle unit then 1 With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. Before you can supply air to the air tanks of a second trailer you need to. In the coupling system, the locking jaws should be fixed around? All rights reserved Site Map. Once you have coupled your rear trailer, you should test the coupling by? What is a converter dolly? you should check the trailer height before connecting a converter dolly to a second or third trailer. Some large trucks have curved (convex or spot) mirrors. Pintle-eye of dolly in place in pintle hook of trailer (s). Some do. The trailer is at the correct height when. 0000001107 00000 n Sketch the shape of the passage between sections 1 and 2. While inspecting your converter dolly coupling, you should make sure there is _____ between the upper and lower fifth wheel. You should be sure the converter dolly air tank drain valves are _______ & the pintle hook is __________. On the middle trailer of a set of triples? Never, 9. rear brakes will not work properly. Connect Converter Dolly to Rear Trailer Make sure trailer brakes are locked and/or wheels chocked. 0000010705 00000 n 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. The dolly will have a yellow lamp on the drivers (left) side. To check that the trailer emergency brakes are working properly, you should pull out the trailer air supply control and? What does the drivers manual say about how much space you should keep ahead of your truck? Air will not be available to release the trailer spring brakes (parking brakes). 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? Allow much more space than is needed for ideal driving condition. to do this without wheel chocks you should: supply air to the trailer air system with the tractor and then disconnect the emergency line. 2) the second test is to go out to the trailer to ensure that the parking brakes have indeed applied. B. do not need to be checked as often as flat mirrors because they show a larger area That there is no space between upper and lower sixth wheel. 60607. You should hear air escaping, showing the entire system is charged. Typically depends on the axle count. Only trailers designed to be pulled with another trailer behind it will have a shut off valve. Close the emergency line shut-off valve at the rear of the trailer. These valves permit closing the air lines off when another trailer is not being towed. To do this without wheels chocks you should: Supply air to the trailer air system with the tractor and then disconnect the emergency line. cQ 220rd8bihuM#Om>G*Lz)g^\l9'A9/omf|b49U[@%jGT-QR6i. The pintle hook? For emergency braking you should: You are doing a walk around inspection of a double or triple trailer rig. We wish you the best of luck in your endeavors and are pleased to be of assistance. These trailers have no parking brake. Slow to a safe speed before entering the curve, then coast through the curve. You will speak with recruiters today. CDL Doubles and Triples Test Question and Answers 2023 [PDF]: Commercial Drivers License Doubles and Triples Endorsements Knowledge Test. 0000010783 00000 n The word part ferrit- means: Open The pressure in the service line is controlled by the brake pedal and the trailer hand brake. The rear trailer of a triple Open, free How many different ways of coupling and uncoupling trailer combinations are there? If there are no dummy couplers, the glad hands can sometimes be locked together (depending on the couplings). Always unlock the pintle hook with the dolly still under the rear trailer. The heavier trailer should be in the rear. 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. Which of the following will probably happen if you are driving a double rig and a set of trailer wheels goes into a skid? c. iron That split second that you release the brakes will allow them to match the vehicles road You should reduce your speed by about _____ on a wet road. C. use a light touch on the accelerator and brake pedals, For coupled double and triple trailers, all of the converter dolly shut-off valves should be: 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 Types of converter dollies. When you do this, you should hear: Delivering to. B. allow one vehicle length for every 10,000 lbs of gross vehicle weight It's a fifth wheel, not a sixth wheel. A on kingpin. 11 Terms in this set (43) Converter dollies are used to connect: A tractor-trailer combination to another trailer. fumoto drain valve. 0000004668 00000 n 0000001582 00000 n It is important to check the height of the trailer before connecting a converter dolly to a trailer. When checking the coupling system, make sure that the locking jaws are around the shank of the. Either the front or the rear brakes will not work properly or fully. The service brakes slowly move to the fully applied position You may not notice a major leak in the service line until you try to put the brakes on. The application only takes one minute. They provide the air pressure used to operate trailer brakes. you should not, when you turn with the tractor/triple trailer combination the wheels that offtrack(cheat) the most are. Stop the vehicle by gearing down and sparingly Air pressure is sent from the air tanks to the brakes by relay valves. How can you test that air flows to all trailers? You must steer gently when pulling trailers. How can you test that air flows to all trailers? 1/3 For example: If you are traveling 60 MPH and it begins to rain, your suggested 0000006195 00000 n The dolly tow bar may fly up, possibly causing injury, and making it very difficult to 8. Open the emergency line shut-off valve at the rear of the last trailer. Follow the procedures described later in this section. You need to be aware of how parking lots are arranged in order to avoid a long and difficult escape. All trademarks are property of their respective owners. Only a certified diesel mechanic can check this. Good speed management says you should: You must drive through deep or flowing water. 6. There is a school zone ahead. If this activity does not load, try refreshing your browser. The couplers have a rubber seal that prevents air from escaping. The heaviest trailer A. open the shut-off valves at the rear of both trailers Go to the rear of the rig. When entering a roundabout, a driver must yield the right-of-way to drivers already in the roundabout and obey all traffic signs. If loading fails, click here to try again. 0000010285 00000 n 9 All ABS equipped units Which of these is the correct answer? With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. locked . If spare tire is carried on converter gear (dolly), make sure it's secured. 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. On a triple combination, the shutoff valves on the rear of the last trailer should be? 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. 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. What do you check when making a visual check of coupling? You should keep at least _____ seconds of space ahead of you. NPT thumbscrew style design enables easy installation. With the red knob pushed in on the tractor dash, the service line should have air in it. Which diagram shows the best way to turn? Release Dolly breaks by opening the air tank petcock or if the dolly has a spring break, use the Dolly parking brake control . When you're trying to correct a drive-wheel braking skid why should you stop braking? You are doing a walkaround inspection of a double or triple trailer rig. D CDL License Requirements State By State. A connection device of one axle used to disconnect a semitrailer combination vehicle your vehicle is so long that you must swing wide to make a turn. On double and triple combinations, you must make sure that which of these is secure? Learn more and apply here: The more heavily loaded semitrailer should be in first position behind the tractor. 0000003998 00000 n how can you be sure you supplied air to a second trailer? There are more things that can go wrong, and doubles/triples are less stable than other commercial vehicles. Slow to the safe speed before entering, then accelerate slightly through the curve. There is more chance for skids and loss of traction. When connecting the glad hands, press the two seals together with the couplers at a 90-degree angle to each other. The converter dolly air tank drain valve on coupled double/triple trailers should be: Closed. None of the above, 4. A major leak in the emergency line will cause the tractor protection valve to close and the trailer emergency brakes to come on. A Commercial Drivers License Overview, Trucking Terminology and Transportation Definitions. Be more careful in adverse conditions. A converter gear or dolly is a coupling device of one or two axles and a fifth wheel by which a semi-trailer can be coupled to the rear of a tractor-trailer combination forming a double bottom. View More Details. A CDL is required to drive any of the following vehicles: A vehicle with two separate parts - the power unit (tractor) and the trailer. You are driving a 100 foot twin trailer combination at 50 mph. Park on level ground, put chock on the tires, and charge the air tank. B. slightly open 1. slow to safe speed before entering, then accelerate slightly through the curve. To do this without wheel chocks you should: Empty trucks: When parking your double or triple combination, you should look for a parking space can and will get stuck on a raised railroad crossing. When connecting two trailers the converter dolly is connected to the rear trailer first. C. the service brakes slowly move to the fully applied position, Some large trucks have converted or "spot" mirrors. If not, there is a problem. There is no obligation whatsoever. 12, 3. what is likely to happen if the pintle hook is unlocked with the dolly still under the second trailer? 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 driver must yield the right-of-way to other vehicles when merging and when entering a highway from an alley. C Because of this, which of the following vehicle parts is most likely to tip over? How do you check to make sure trailer height is correct before coupling? you want to hook your combination to a second trailer that has no spring brakes. Should I Be A Truck Driver? Eventually, the air will leak away, and then there will be no brakes. D The number and size of air tanks varies among vehicles. B. slow to a safe speed before entering the curve, then accelerate slightly through it ADVERTISEMENT ADVERTISEMENT 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? What is the most common foundation brake found on heavy vehicles? Open the emergency line shut-off valve at the rear of the last trailer. The lighter trailer should be in the rear. 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. Which of these statements about managing space to the sides is true? When uncoupling a rear trailer, your rig should be parked in a straight line on? A. the total stopping distance of a truck is the distance it takes to stop once the brakes are put on at any speed the trailer height is right when: the trailer will be raised slightly when the converter dolly is backed under it. 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. In order to receive your Doubles and Triples endorsement, it is required that you pass the states official CDL written Knowledge exam. When you do this, you should hear: you are driving with double trailer and must use your brakes to avoid a crash. For emergency braking you should: May have poor traction due to bouncing and wheels lockup. Becoming A Truck Driver is a dream we've all pondered at some point in our lives. 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 _____. B. you should avoid traveling next to others whenever possible The Verge logo. 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. B If your converter dolly has to be moved over a distance to bring it to your semitrailer, you should? You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. You are driving with more than one trailer. You can also reach us at (888) 830-2326. Ensuring the safety of the public starts with a thorough inspection of all equipment. B 27. Visually check to make sure that the lead trailer is slightly higher than the center of Wait for air pressure to reach normal, then push in the red trailer air supply knob. - Converter dolly air tank drain valve: CLOSED. A full trailer behind a truck you are driving a set of doubles and a set of trailer wheels goes in a skid. Which trailer should come first behind the tractor? A. use the engine brake or speed retarder C. posted speed limits on curves are safe for all trucks, Empty trucks: Do converter dollies have spring brakes? There are two types of converter dollies. You may be timed. To prevent trailers from rolling over, you must steer gently and go slowly around corners, on ramps, off ramps and curves. 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. You should NOT: Do converter dollies have spring brakes? Be certain you are clear at the sides before changing lanes. A. always keep your vehicle to the right side of your lane The trailer height is right when: The trailer will be raised slightly when the converter dolly is backed under it. Hazardous materials must be placarded on all four sides of EACH Trailer. A sudden movement with the steering wheel can result in a tipping over rear trailer. You are driving a 100 ft twin trailer combination at 50 mph. How do you know if your converter dolly is equipped with antilock brakes? This means. The last trailer in a combination is most likely to turn over. The emergency brakes come on whenever the air supply knob is pulled out or the trailer is disconnected.
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