HlTo xGf`{iIMh-x||?pbE':X4ZZZRbu7 uvi_RHUkVXBVu{^B3 4e/iw\]RE] YY7i)e V*h(++WQ-]Xm9c5yU6BS" 5HiL,[b)ee:t/ )%BVGpU7T\ZJD Any time you have to If you do cross the air lines, supply air will be sent to the service line instead of going to charge the trailer air tanks. The pintle hook should always be secure when the vehicle is in motion. 0000001775 00000 n Submit your email at the end of the test. When you are pulling trailers, which of the following statements is true about steering? Make sure you have large enough gaps before entering or crossing traffic. When checking the coupling system, make sure that the locking jaws are around the shank of the. You should hear air escaping, showing the entire system is charged. not have spring brakes. While inspecting your converter dolly coupling, you should make sure there is _____ between the upper and lower fifth wheel. You must treat a flashing red signal as you would treat a STOP sign. You may be timed. This has the same value as the %%PERCENTAGE%% Variable on the Final Screen. Time limit varies by state. But the brakes will hold only as long as there is air pressure in the trailer air tank. Number of wrong answers. Mar 2 - Mar 3. 0000003998 00000 n you should keep atleast __seconds of space ahead of you. 4. A. open the shut-off valves at the rear of both trailers You should keep at least ____ seconds of space ahead of you. When coupling twin trailers, a converter dolly is. Safety fail-safe features of a tractor-trailer converter dolly. If your converter dolly has to be moved over a distance to bring it to your semitrailer, you should? D You have not finished your quiz. C This has the same value as the %%SCORE%% Variable on the Final Screen. you are driving a 100ft truck eith double trailers at 50mph. This means. B. for doubles and triples, the fifth wheel should be all the way towards the tractor Air escape from the open valve You are driving with double trailers and must use your brakes to avoid a crash. 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? Which f these will result in the best control on curves? A. require shorter stopping distances than full ones you want to hook your combination to a second trailer that has no spring brakes. good speed management says you should, may have poor traction due to bouncing and wheel lock up. 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). There is no requirement or exact standard for color coding. 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. 10 When uncoupling doubles or triples, what is important to know about unlocking the pintle hook? That there is some space between the upper and lower fifth wheel. which of these statements about the handling of doubles and triples is true ? When driving a truck with more than one trailer, which trailer should be first behind the truck? If you leave this page, your progress will be lost. This has the same value as the %%TOTAL%% Variable on the Final Screen. Some do. D The couplers have a rubber seal that prevents air from escaping. 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? What three methods can you use to secure a second trailer before coupling? Do converter dollies have spring brakes? paramount to safe driving. What does the Driver's manual say about how much space you should keep ahead of your truck? Time allowed (Requires timer add on). This has the same value as the %%WRONG_ANSWERS%% Variable on the Final Screen. 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 Disconnect the glad-hand at the front of the first trailer and listen for air flow. When does the Driver's manual say you should disable the steering axle brake? The coupling between a rear trailer and a dolly should have a space between the upper and lower fifth wheels of? What does the Commercial Driver Handbook say about how much space you should keep ahead of your truck? Their drawbars differentiate them. 1/4 in. A major leak in the emergency line will cause the tractor protection valve to close and the trailer emergency brakes to come on. How can you test that air flows to all trailers? 1 A major leak in the emergency line will cause the tractor protection valve to close and the trailer emergency brakes to come on. 3. Becoming A Truck Driver is a dream we've all pondered at some point in our lives. We have a new version of this program. Tips for Backing Up a Trailer Like a Pro Trucker. symptoms of a bad fuel tank selector switch. How do you know if your converter dolly is equipped with antilock brakes? You are driving with more than one trailer. If one air system is very low on pressure _______. A What types of trailers can get stuck on raised crossings? 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. If your tanks have automatic drains, they will keep most moisture out, but you should still open the drains to make sure. 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. B Dont hesitate to take advantage of our practice tests in each category specific to your needs. Because of this, which of the following vehicle parts is most likely to tip over? For emergency braking you should: While inspecting your converter dolly coupling, you should make sure there is _______ between the upper and lower fifth wheel. 0000001582 00000 n 0000006195 00000 n A dolly should be pulled out from a rear trailer using? The rear trailer does not have shut-off valves. The emergency brakes come on whenever air pressure in the emergency line is lost. a sudden movement with the steering wheel can result in a tipped over rear trailer, you wish to turn right from one two-lane, two-way street to another. 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. which of these statements about quick steering movements and doubles/triples is true? The dolly tow bar may fly away, possibly causing panic, and making it very difficult The rear trailers shut-off valves should be open and the front closed. Take special care when pulling two and three trailers. ), a 15 year truck driving veteran, in January 2007. You are driving with double trailers and must use your brakes to avoid a crash. For a particular IC-fabrication process, the transconductance parameter kn=400A/V2,k_{n}^{\prime}=400 \mu \mathrm{A} / \mathrm{V}^{2},kn=400A/V2, and Vt=0.5V.V_{t}=0.5 \mathrm{V}.Vt=0.5V. Before you can supply air to the air tanks of a second trailer you need to. The number of correct answers. Sometimes, metal tags are attached to the lines with the words service and emergency stamped on them. It depends on the load The pintle hook? D How can you be sure you supplied air to a second trailer? Which of these is most likely to occur? It's a fifth wheel, not a sixth wheel. Lock pintle hook. Seriously! TestPermit.com provides free unofficial review materials for a variety of exams. 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. Open the shut-off valves at the rear of the last trailer and listen for air flow. If you do, the brakes may not work correctly. They are filled by the emergency (supply) line from the tractor. How do you know if your converter dolly is equipped with antilock brakes? C. use controlled or stab braking, The best way to stop any skid is to: All of the above, 6. Safety chains secured to trailer (s). 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. You are driving a 100 foot twin trailer combination at 50 mph. Remember however, that is just a suggestion. A thorough pre-trip inspection should catch any major service line leaks before you begin your trip. 1/32 to 3/32 of an inch. This will let the rear wheels roll again and keep the rear wheels from sliding. 2. 0000002446 00000 n There is a school zone ahead. Slow to a safe speed before entering the curve, then coast through the curve. A You should keep at least ____ seconds of space ahead of you. The rear trailer of a double C. closed; unlatched, Which of these will result in the best control on a curve? 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. Be certain you are clear at the sides before changing lanes. Go to the rear of second trailer and open the emergency line shut-of valve. Push the brake pedal as hard as you can and hold it there Converter dolly air tank drain valve: CLOSED. The heavier trailer should be in the rear. . A-dolly. You need to be aware of how parking lots are arranged in order to avoid a long and difficult escape. Before coupling a trailer, you should make sure it is at the right height using? Locking jaws open How To Use Cruise Control Effectively As A Truck Driver. You will have greater length and more dead axles to pull with your drive axles than other drivers. D Our normal business hours are Monday-Friday 8 a.m. to 5 p.m. (Pacific Time). If spare tire is carried on converter gear (dolly), make sure it's secured. B. closed 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. 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? A Commercial Drivers License Overview, Trucking Terminology and Transportation Definitions. For emergency braking you should: You are doing a walk around inspection of a double or triple trailer rig. The road is dry and visibility is good. If spare tire is on converter gear (dolly), make sure it is secured. Locking jaws closed on S-cam brakes are the most common style brakes on large trucks today. The Doubles and Triples written CDL Exam is required for your doubles and triples endorsement. On a triple combination, the shutoff valves at the rear off the middle trailer should be? Calculate the net energy change in kilojoules per mole that takes place on formation of MgF2_22(s) from the elements: Heat of sublimation for Mg(s) = 147.7 kJ/mol Eea_{ea}ea for F(g) = -328 kJ>mol, Bond dissociation energy for F2_22(g) = 158 kJ>mol Ei1_{i1}i1 for Mg(g) = 737.7 kJ>mol, Electrostatic interactions in MgF2_22(s) = -2957 kJ/mol Ei2_{i2}i2 for Mg(g) = 1450.7 kJ/mol. If the fifth wheel on a coupling is too far forward, the tractor frame may hit? The pressure in the service line is controlled by the brake pedal and the trailer hand brake. A bent or damaged kingpin on a coupling should be? What is a converter dolly? King pin. 0000009577 00000 n B. slightly raised These valves permit closing the air lines off when another trailer is not being towed. 2003-2023 Chegg Inc. All rights reserved. The shut off valves, when in the open position, allows air to flow out to another trailer. The road is dry and the visibility is good. 1. Nothing, the weight of the trailer will keep it in place, 10. Like a trailer, a dolly equipped with ABS will have a yellow indicator light on the left side. The trailer height is right when: The trailer will be raised slightly when the converter dolly is backed under it. This will supply air to the emergency (supply) lines. 0000005554 00000 n Doubles and triples are more likely to turn over than other combination vehicles because of the "crack- the-whip" effect. to re-capture it. Do converter dollies have spring brakes? You should keep at least _____ seconds of space ahead of you. The Verge logo. Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? you are doing a walkaround inspection of a double or triple trailer rig. Unless you are draining the condensation out of the air tank, then the drain valve Only trailers designed to be pulled with another trailer behind it will have a shut off valve. To check that the trailer emergency brakes are working properly, you should pull out the trailer air supply control and? converting it into two trailers, A coupling device of three or four axles and a fifth wheel by which a semitrailer can Then, the air loss from the leak will lower the air tank pressure quickly. Which of the following must be connected when coupling tractor to trailer or trailer to trailer? What is most likely to happen if the trailer protection valve of a double or triple trailer does not function correctly? They are not only longer, but also need more space because they cannot be turned or stopped suddenly. 5. Pull gently against the pin of the second trailer. For emergency braking you should: You should be sure the converter dolly air tank drain . 0000005345 00000 n Be more careful in adverse conditions. Types of converter dollies. when does the drivers manual say you should disable the steering axle brakes? Visually check to make sure that the lead trailer is slightly higher than the center of 0000001107 00000 n The lighter trailer should be in the rear. 0000006383 00000 n 9 Questions You Must Ask, Decide if Truck Driving is The Correct Career Path, Do Not Sell or Share My Personal Information. When you're finished, check your score and results. Connect the Converter Dolly to the Rear Trailer: Test the coupling by pulling against the pin of the second semitrailer. This has the same value as the %%TIME_ALLOWED%% Variable on the Final Screen. The road is dry, and visibility is good. 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 should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. Otherwise, the dolly tow bar may fly up, possibly causing injury and making it very difficult to re-couple. Which 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? Contributor: Luke Nold (Experienced truck driver for 5+ years and published writer for Fleet Magazine). By clicking the ["Send"] button, you agree to our Terms of Use and Privacy Policy, and to the use of cookies described therein, and you also consent to the collection, storage, and processing of your data in the United States where the level of data protection may be different from that in your country. C None of the above, 5. If there is Converter dolly air tank drain valve: CLOSED. A dolly is like a very short trailer, with a ring hitch on the front and a fifth wheel on top. B securely fastened. A 0000001162 00000 n A. the total stopping distance of a truck is the distance it takes to stop once the brakes are put on at any speed All rights reserved Site Map. B For all brakes to work on a triple combination, you must have air supply? There are more critical parts to check when you have two or three trailers. 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. 0000010705 00000 n When checking the fifth wheel, you should make sure that it has enough? Time used (Requires timer add on). Connect Converter Dolly to Front Trailer Back first semitrailer into position in front of dolly tongue. That split second that you release the brakes will allow them to match the vehicles road 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. Provides a snug fit to eliminate unwanted seepage of air or water. Any vehicle, regardless of size, designed to transport 16 or more persons, including the driver. This will prevent water and dirt from getting into the coupler and the air lines. A. opening the air tank petcock 0000010306 00000 n Which of the following statements about off tracking is true? the trailer height is right when: the trailer will be raised slightly when the converter dolly is backed under it. Usually need a glad hand converter This is CDL Doubles and Triples Test 3in our original Classic Mode. B. are the easiest to stop since there is no shifting cargo 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. 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. A. use a low gear A converter dolly is a piece of equipment designed to allow commercial trucks, such as semi-trucks, to pull a trailer. unsafe slow down even further, or better yet, find a safe haven and park until the can and will get stuck on a raised railroad crossing. These dollies will have a yellow lamp on the left side of the dolly. B. the emergency line valve open and release air Good speed management says you should: You must drive through deep or flowing water. you should check the trailer height before connecting a converter dolly to a second or third trailer. B. pull gently against the pin of the second semitrailer Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? In order to receive your Doubles and Triples endorsement, it is required that you pass the state's official CDL written Knowledge exam. Your vehicle is so long that you must swing wide to make the turn. Park on level ground, put chock on the tires, and charge the air tank. Which is most likely to tip over: In a certain electronic device, a three-stage amplifier is desired, whose overall voltage gain is 42 dB. By clicking on "Sign Up", you agree to our Terms of Use and Privacy Policy. A. fully lowered C. engaging the tractor valve protection control, You must drive through deep or flowing water. Once you have coupled your rear trailer, you should test the coupling by? When you do this, you should hear: 2) the second test is to go out to the trailer to ensure that the parking brakes have indeed applied. Remember, the service line is not used unless you depress the brake pedal or use the trailer hand valve. 0000001956 00000 n 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. 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. Light cords firmly in sockets on trailer. 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. A Open, latched B Open, free C Closed, latched D Closed, free 28. some large trucks have curved (convex or spot) mirrors. These dollies will have a yellow lamp on the left side of the dolly Questions You Should Know For Doubles And Triples 1. To check air flows to all trailers, you should let air pressure reach normal then? 0000006836 00000 n You should avoid traveling next to others when possible. the rig will continue moving in a straight line no matter how much the steering wheel is turned. Which of these are the correct positions for shut-off valves in doubles and triples? The tanks will hold enough air to allow the brakes to be used several times even if the compressor stops working. D Take this same test in our other testing modes How to Get a Hazardous Materials Endorsement, What is a CDL? Study section 6.2 if you can't answer all of these questions. 8. If you do, there is a problem. Never, 9. B Sketch the shape of the passage between sections 1 and 2. Leave the emergency line shut-off valve closed and open the service line valve. which of these is not a good thing to do when driving on slippery roads? Shut off valves are only used on trailers designed to be towed in conjunction with other trailers (doubles / triples). 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. Pickup at South Loop. The rear trailers shut-off valves should be closed and the front open. D Related Question Question: What does this sign mean? D B. allow one vehicle length for every 10,000 lbs of gross vehicle weight Each trailer and converter dolly has one or more air tanks. A. hand valve Open the emergency line shut-off valve at the rear of the last trailer. If you have traffic on both sides of your vehicle and something is blocking your lane, a move to the right still be best. kingpin. To do this without wheel chocks you should: Empty trucks: When parking your double or triple combination, you should look for a parking space 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: How do you check to make sure trailer height is correct before coupling? Once you are finished, click the button below. You should be sure the converter dolly air tank . B. you can almost always stop more quickly than you can turn . When you do this, you should hear: you are driving with double trailer and must use your brakes to avoid a crash. A 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: Some large trucks have curved (convex or spot) mirrors. Flammable materials in the front trailer then it must have the placards on that trailer. B. restore traction to the tires c. iron The emergency line valve open and release air C. fully raised, Which of these statements about speed management and braking is true? Which of the following is true about loading cargo into double or triple trailers? A. completely open How do you check to make sure trailer height is correct before coupling? 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. Which diagram shows the best way to turn? Locking jaws closed on Slow to the safe speed before entering, then accelerate slightly through the curve.
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