The converter dolly is an auxiliary axle with a coupling device. Nothing, the weight of the trailer will keep it in place, 10. you are driving at night and you must dim your headlights for traffic. Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? securely fastened. What do you check when making a visual check of coupling? What does the Commercial Driver Handbook say about how much space you should keep ahead of your truck? New! For emergency braking you should: 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; . A turn of the glad hand attached to the hose will join and lock the couplers. You MUST have air all the way to the back for all the brakes to work. Which of these are the correct positions for shut-off valves in doubles and triples? 2) the second test is to go out to the trailer to ensure that the parking brakes have indeed applied. Open the shut-off valves at the rear of the last trailer and listen for air flow. B. for doubles and triples, the fifth wheel should be all the way towards the tractor B. releasing the pintle hook Driving doubles/triples is also more dangerous in hot and cold weather driving, as well as on mountain roads. 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. 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). Which of the following must be connected when coupling tractor to trailer or trailer to trailer? The A-dolly has a single drawbar with a single, centered hitching point. The heaviest trailer 11 During normal operation the brakes of the double/triple trailer are controlled by: Be more careful in adverse conditions. 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. Check them all. Safety should never take second place, so know your stuff! Be sure pintle-eye of dolly is in place in pintle hook of trailer(s). Otherwise, the dolly tow bar may fly up, possibly causing injury and making it very difficult to re-couple. The emergency brakes come on whenever the air supply knob is pulled out or the trailer is disconnected. When the road is slippery What is a converter dolly? The trailer is at the correct height when. Locking jaws open King pin. A. fully lowered 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. When you do this, you should hear: Which of these statements about emergency steering is true? C 0000006383 00000 n Should the converter dolly air-tank drain valve be open or closed on a double trailer combination? On the first trailer in a set of doubles? When the road is dry What is likely to happen? the rig will continue moving in a straight line no matter how much the steering wheel is turned. 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. 2. Only a certified diesel mechanic can check this. How much space should be between the upper and lower fifth wheels? If there is air there, then there is air towards the cab You want to hook up to the first trailer, then the converter dolly while it is lined up in A. closed; latched 0000007508 00000 n dress gifs. B True False True If you want to couple a second trailer to you combiantion vehicle, secure it by using the: Trailer emergency air brakes. Take special care when pulling two and three trailers. If the converter dolly is close to your semitrailer, you should wheel it into position? A converter dolly is a piece of equipment designed to allow commercial trucks, such as semi-trucks, to pull a trailer. You should reduce your speed by about _____ on a wet road. D _______ should be tested with the hand valve but controlled in normal operation with the foot pedal. A truckers workspace is a small moving office Read More. S-cam brakes are the most common style brakes on large trucks today. What three methods can you use to secure a second trailer before coupling? If not, there is a problem. 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. You should hear air escaping, showing the entire system is charged. 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? which of these is not a good thing to do when driving on slippery roads? Did you know you can fill out one quick form here on TruckingTruth and apply to several companies at once for paid CDL training? 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 It is important to check the height of the trailer before connecting a converter dolly to a trailer. 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. 9 When driving with more than one trailer, which trailer should be the first one behind the tractor? They provide the air pressure used to operate trailer brakes. You should keep at least ____ seconds of space ahead of you. converting it into two trailers, A coupling device of three or four axles and a fifth wheel by which a semitrailer can C. use stab or controlled braking, Which of these is true? To test the tractor protection valve, charge the trailer air brake system, turn off the engine, and Locking jaws closed on They are filled by the emergency (supply) line from the tractor. 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. 1/2 to 3/4 of an inch You shouldn't stop braking. Why should you not use the trailer hand valve while driving? when driving a truck with more than one trailer, which trailer should be first behind the truck? Hit the article to see the way to back up your trailer like a pro! This has the same value as the %%TIME_USED%% Variable on the Final Screen. C. fully raised, Which of these statements about speed management and braking is true? That there is no space between upper and lower sixth wheel. Park the rear trailer against another trailer, chock the tires and lock the trailer Before coupling a trailer, you should make sure it is at the right height using? Clean the couplers and rubber seals before a connection is made. You are driving a 100 ft twin trailer combination at 50 mph. A. the total stopping distance of a truck is the distance it takes to stop once the brakes are put on at any speed How do you know if your converter dolly is equipped with antilock brakes? 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 steer gently when pulling trailers. To do this without wheels chocks you should: Supply air to the trailer air system with the tractor and then disconnect the emergency line. It depends on the load None of the above, 4. Secure converter gear support in raised position. You can reset the test and retake it as needed. you should keep atleast __seconds of space ahead of you. Types of converter dollies. A. open the shut-off valves at the rear of both trailers If you're only pulling one trailer, the shut off valves should always be closed or else the air will simply escape out the back of the trailer. Speed for other vehicles is often too fast for a multi-combination unit! 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? There is more chance for skids and loss of traction. They are filled by the emergency (supply) line from the tractor. When connecting the glad hands, press the two seals together with the couplers at a 90-degree angle to each other. 0000010783 00000 n Definition. Each tank has a drain valve on it, and you should drain each tank every day. Make sure you do not get in a spot you cannot pull straight through. You are doing a walk around inspection of a double or triple trailer rig. If there is Safety fail-safe features of a tractor-trailer converter dolly. When you do this, you should hear: 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: and the converter dolly air tank drain valve should be _____. Watch the wording of the question AND the answers A safe driver will look for all of the above. The rear trailers shut off valves should be closed and the front open to allow air to the 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. Which of these statements about quick steering movements and doubles/triples is true? You will not be tested on uncoupling twins unless you want to get a double/triple trailer endorsement on your license. You are driving with double trailers and must use your brakes to avoid a crash. Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? You should be sure the converter dolly air tank drain . Describe what the trailer air supply control does. Slow to a safe speed before entering the curve, then coast through the curve. Each trailer and converter dolly has one or more air tanks. on kingpin. If it goes low enough, the trailer emergency brakes will come on. B The road is dry, and visibility is good. B. use only the trailer brakes 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. coupled to the rear of a tractor-trailer combination forming a double bottom rig, Careful of the wording! You should be sure the converter dolly air tank drain valves are _____ and the pintle hook is _____. Some do. if you have traffic on both sides of your vehicle and something is blocking your lane, a move to the right still be best. None 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. This would be very dangerous. 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. The service brakes slowly move to the fully applied position 3. You should keep at least ____ seconds of space ahead of you. Any trailer, 7. the road is dry & visibility is good. 0000004668 00000 n What do you check when making a visual check of coupling? 0000001354 00000 n Which of the following will occur? Usually need a glad hand converter B. allow one vehicle length for every 10,000 lbs of gross vehicle weight B. do not need to be checked as often as flat mirrors because they show a larger area In an application in which vGS=vDS=Vsupply=1.8V,v_{G S}=v_{D S}=V_{\text { supply }}=1.8 \mathrm{V},vGS=vDS=Vsupply=1.8V, a drain current of 2 mA is required of a device of minimum length of 0.18m.0.18 \mu \mathrm{m}.0.18m. The converter dolly air tank drain valve on coupled double and triple trailers should be: A. open B. closed C. partially opened B When inspecting coupled doubles and triples, make sure the pintle hooks are: A. secured to the safety pins B. in the open position C. latched C Which of these is true? A Air pressure is sent from the air tanks to the brakes by relay valves. When coupling twin trailers, a converter dolly is. The number of correct answers. what is likely to happen if the pintle hook is unlocked with the dolly still under the second trailer? B C. posted speed limits on curves are safe for all trucks, Empty trucks: Dont hesitate to take advantage of our practice tests in each category specific to your needs. You will speak with recruiters today. To check that the trailer emergency brakes are working properly, you should pull out the trailer air supply control and? When uncoupling doubles or triples, what is important to know about unlocking the pintle hook? The dolly tow bar may fly up you should avoid traveling next to others when possible. The road is dry and visibility is good. The shut off valves prevent air from going any further. Any vehicle, regardless of size, designed to transport 16 or more persons, including the driver. Converter dollies have spring brakes. That there is some space between the upper and lower fifth wheel. 0000010705 00000 n Converter dollies are connected to front trailers with a? Air escape from the open valve You are driving with double trailers and must use your brakes to avoid a crash. Visually check to make sure that the rear trailer is slightly lower than the center of the Opening the shut off valves on the rear most trailer will ensure the lines are flowing There are more critical parts to check when you have two or three trailers. Which of the following statements about off tracking is true? 0000008894 00000 n The pintle hook should always be secure when the vehicle is in motion. These valves permit closing the air lines off when another trailer is not being towed. B. are the easiest to stop since there is no shifting cargo You are doing a walk around inspection of a double or triple trailer rig. You wish to turn right from one two-lane, two-way street to another. Never, 9. There is no obligation whatsoever. CDL Doubles and Triples Test Question and Answers 2023 [PDF]: Commercial Drivers License Doubles and Triples Endorsements Knowledge Test. 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. You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. If you do, there is a problem. When coupling twin trailers, you should _______ the pintle hook and secure the dolly support in the _______ position. B The rear trailer of a double The trailer height is right when: The trailer will be raised slightly when the converter dolly is backed under it. 1 What happens when there is a major leak in the emergency air line? Once you have coupled your rear trailer, you should test the coupling by? The road is dry and visibility is good. 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 . Often do not have spring brakes A. make things look smaller and farther away than they really are Pull gently against them in a low gear to make sure the brakes work. Which the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the trailer. If spare tire is on converter gear (dolly), make sure it is secured. then there is a problem with the ABS system. Submit your email at the end of the test. 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. the trailer height is right when: the trailer will be raised slightly when the converter dolly is backed under it. You should keep at least _____ seconds of space ahead of you. Air will not be available to release the trailer spring brakes (parking brakes). you are driving a 100ft truck eith double trailers at 50mph. All trademarks are property of their respective owners. Locking jaws closed on If you crossed the air lines, you could drive away, but you would not have trailer brakes. Hit the article below to see specific information about AOBRDs! You are visually checking the coupling of a converter dolly to the rear trailer. Doubles and triples are more likely to turn over than other combination vehicles because of the "crack-the-whip" effect. In order to receive your Doubles and Triples endorsement, it is required that you pass the states official CDL written Knowledge exam. "Glad hands" are coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer. 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 It's a fifth wheel, not a sixth wheel. These mirrors: make things seem smaller & further away then they really are. When you do this, you should hear: D will have a lamp on the drivers side. 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. Please visit using a browser with javascript enabled. 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. When entering a roundabout, a driver must yield the right-of-way to drivers already in the roundabout and obey all traffic signs. We'll help you make the right choices and prepare for a great start to your trucking career. The driver will be required to complete this requirement in three eight hour shifts. Which diagram shows the best way to turn? Any trailer with a reduced ground clearance What is a converter dolly? You should not hear air escaping. But the brakes will hold only as long as there is air pressure in the trailer air tank. You should keep at least ____ seconds of space ahead of you. If loading fails, click here to try again. A. for coupled doubles and triples, be sure that the pintle hook is in the open position When you do this, you should hear: Ais escape from the open valve. during normal operation the brakes of the double/triple trailer are controlled by : which of these will result in the best control on curves? c. iron Delivering to. Lock pintle hook. A. use a low gear Each trailer and converter dolly has one or more air tanks. Air pressure is sent from the air tanks to the brakes by relay valves. You want to lock your combination to a second trailer that has no spring brakes. Open, free C. foot pedal, Which of these statements about managing space to the sides is true? 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. The front trailer in a set of double trailers is most likely to turn over due to the Crack-the-Whip effect. unsafe slow down even further, or better yet, find a safe haven and park until the 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 shut off valves, when in the open position, allows air to flow out to another trailer. D The pressure in the service line tells how much pressure the relay valves should send to the trailer brakes. If the dolly is a two axle unit then 1 Follow the procedures described later in this section. A. open symptoms of a bad fuel tank selector switch. Why should you use chocks when parking a trailer without spring brakes? You can also reach us at (888) 830-2326. A vehicle transporting hazardous materials is required to display placards where? Converter dolly air tank drain valve: CLOSED Air lines supported and glad hands properly connected. The Verge logo. You are driving a 100-feet truck with double trailers at 30 mph. 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. A. hand valve In order to receive your Doubles and Triples endorsement, it is required that you pass the state's official CDL written Knowledge exam. Terms in this set (43) Converter dollies are used to connect: A tractor-trailer combination to another trailer. Connect Converter Dolly to Front Trailer Back first semitrailer into position in front of dolly tongue. All other trailer air functions use the emergency line. If you do, the brakes may not work correctly. The application only takes one minute. These dollies will have a yellow lamp on the left side of the dolly. You will speak with recruiters today. 0000002446 00000 n If one air system is very low on pressure _______. C How many different ways of coupling and uncoupling trailer combinations are there? Make sure to visually inspect the fifth wheel and that the locking mechanism is which of these statements about quick steering movements and doubles/triples is true? (done) Chp 23: Cash Flow + Working Capital, Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer. 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. Connect the Converter Dolly to the Rear Trailer: Test the coupling by pulling against the pin of the second semitrailer. Open. Safety chains secured to trailer (s). When connecting two trailers the converter dolly is connected to the rear trailer first. Allow much more space than is needed for ideal driving condition. We are here to help. What will happen if there is a major leak in the service air line? 0000010285 00000 n If your tanks have automatic drains, they will keep most moisture out, but you should still open the drains to make sure. 2. Use controlled or stab braking Ideal for replacing a worn, leaky drain valve on a compressor. 0000007032 00000 n The emergency brakes come on whenever air pressure in the emergency line is lost. A major leak in the emergency line will cause the tractor protection valve to close and the trailer emergency brakes to come on. Select the answer that correctly completes each statement. 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. This means. Should I Be A Truck Driver? B. you need about four times as much stopping distance at 40 mph as at 20 mph 0000005733 00000 n front of the second trailer. The dolly tow bar may fly up, possibly causing injury and making it very difficult to re-couple. What should you check for when inspecting the converter dolly? 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. When checking the fifth wheel, you should make sure that it has enough? The crack the whip effect will topple the rear trailer first. If there are no dummy couplers, the glad hands can sometimes be locked together (depending on the couplings). TestPermit.com provides free unofficial review materials for a variety of exams. 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. The rear trailer of a triple Air escape from the open valve The shortest trailer For emergency braking you should: You are doing a walk around inspection of a double or triple trailer rig. You should be sure the converter dolly air tank drain valves are _______ & the pintle hook is __________. For emergency braking you should: A Push the brake pedal as hard as you can and hold it there B 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? When checking the coupling system, make sure that the locking jaws are around the shank of the. A low air buzzer will go off indicating something is wrong and either the front or the [California Commercial Driver Handbook] The weight of a truck: Is a major factor affecting stopping distance. 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. In bad weather, slippery conditions and mountain driving, you must be especially careful if you drive double and triple bottoms. What three methods can you use to secure a second trailer before coupling? C. drive through quickly, With the hand valve on, you should test the trailer brakes by opening the service valve line at the rear of the rig. 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: Your vehicle is so long that you must swing wide to make the turn. When uncoupling, you should never unlock the _______ with the dolly still under the rear trailer. Typically depends on the axle count. None of the above, 5. Some large trucks have curved (convex or spot) mirrors. Only trailers designed to be pulled with another trailer behind it will have a shut off valve. Which of the following will probably happen if you are driving a double rig and a set of trailer wheels goes into a skid? Newer trailers have spring brakes just like trucks and truck tractors. Each trailer and converter dolly has one or more air tanks. 0000008915 00000 n In the coupling system, the locking jaws should be fixed around? The emergency line valve open and release air How do you check to make sure the trailer height is correct before coupling? When checking your air lines, they must be secure and? On the middle trailer of a set of triples? A. air escape from the open valve B. you can almost always stop more quickly than you can turn It is very important to keep the air supply clean. 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 are visually checking the coupling of a converter dolly to the rear 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? 9 Questions You Must Ask, Decide if Truck Driving is The Correct Career Path, Do Not Sell or Share My Personal Information. With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. There is a school zone ahead. There is no obligation whatsoever. 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 Do converter dollies have spring brakes? However, converter dollies and trailers built before 1975 are not required to have spring brakes. If you have traffic on both sides of your vehicle and something is blocking your lane, a move to the right still be best. 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.
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