the converter dolly air tank drain valve should be

Hazardous materials must be placarded on all four sides of EACH Trailer. Air flows steadily and isentropically through a passage. C. the service brakes slowly move to the fully applied position, Some large trucks have converted or "spot" mirrors. These mirrors: Make things seem smaller and further away than they really are. 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 _______. Definition. fifth wheel, so trailer is raised slightly when dolly is pushed under it. D Which trailer should come first behind the tractor? If it goes low enough, the trailer emergency brakes will come on. Be sure pintle-eye of dolly is in place in pintle hook of trailer(s). When testing trailer service brakes, you should use? What is likely to happen? All trademarks are property of their respective owners. The coupling between a rear trailer and a dolly should have a space between the upper and lower fifth wheels of? Also, this page requires javascript. 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 should you check for when inspecting a converter dolly? Hit the article below to see specific information about AOBRDs! re-couple, You can if you want to, it does not matter. To prevent trailers from rolling over, you must steer gently and go slowly around corners, on ramps, off ramps and curves. To uncouple the rear trailer in a set of doubles, the shut-off valve at the rear of the front trailer should be: Closed. Connect the Converter Dolly to the Rear Trailer: Test the coupling by pulling against the pin of the second semitrailer. 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: 11 During normal operation the brakes of the double/triple trailer are controlled by: safe speed would be 40 MPH. Speed for other vehicles is often too fast for a multi-combination unit! Which the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the trailer. 1/2 to 3/4 of an inch The road is dry and visibility is good. What happens when there is a major leak in the emergency air line? 0000004689 00000 n 2) the second test is to go out to the trailer to ensure that the parking brakes have indeed applied. Use only the trailer brakes Once you are finished, click the button below. Do converter dollies have spring brakes? Disconnect the glad-hand at the front of the first trailer and listen for air flow. Air escape from the open valve You are driving with double trailers and must use your brakes to avoid a crash. Therefore, it is very important for safety that you use wheel chocks when you park trailers without spring brakes. 0000006195 00000 n The converter dolly is an auxiliary axle with a coupling device. C. may have poor traction due to bouncing and wheel lockup, Before you can supply air to the air tanks of a second trailer you need to: 0000003261 00000 n They are filled by the emergency (supply) line from the tractor. Doubles and triples must be driven very smoothly to avoid rollover or jackknife. Safety chains secured to trailer (s). 0000010705 00000 n You must treat a flashing red signal as you would treat a STOP sign. you want to hook your combination to a second trailer that has no spring brakes. Doubles and triples are more likely to overturn than other combination vehicles because of the whip cracking effect. The application only takes one minute. C They provide the air pressure used to operate trailer brakes. 9. That there is some space between the upper and lower fifth wheel. Release Dolly breaks by opening the air tank petcock or if the dolly has a spring break, use the Dolly parking brake control . A sudden movement with the steering wheel can result in a tipping over rear trailer. behind the shut-off valve then they need to remain open. dress gifs. Hb```f``b`c``e@ (Q6_* 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. Charge the system and pump the brakes with the window down. A dolly has lights, air tanks, air relays, air lines, air brakes, ABS, electrical connections, etc. Nothing, the weight of the trailer will keep it in place, 10. Why is there still destructive interference? C. 3, You are doing a walk around inspection of a double or triple trailer rig. 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. Should the converter dolly air-tank drain valve be open or closed on a double trailer combination? The application only takes one minute. 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? the fifth wheel, so trailer is raised slightly when dolly is pushed under it. In order to receive your Doubles and Triples endorsement, it is required that you pass the states official CDL written Knowledge exam. 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 All ABS equipped units Once that's complete, then its an easy push back and the The crack the whip effect that troubles trucks with trailers. With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. Which diagram shows the best way to turn? C. use controlled or stab braking, The best way to stop any skid is to: We are here to help. Pintle hook latched. To do this without wheels chocks you should: Supply air to the trailer air system with the tractor and then disconnect the emergency line. (done) Chp 23: Cash Flow + Working Capital, Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer. However, converter dollies and trailers built before 1975 are not required to have spring brakes. Only trailers designed to be pulled with another trailer behind it will have a shut off valve. 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. Use the dummy couplers when the air lines are not connected to a trailer. retrovirus $_____________________________$. 5. You shouldn't stop braking. D For emergency braking you should: The last trailer in a combination is most likely to turn over. C What does the Driver's manual say about how much space you should keep ahead of your truck? The road is dry and the visibility is good. Many scientists are concerned that the melting of Earth's sea ice will increase Earth's surface temperature. None of the above, 4. you are driving a 100ft truck eith double trailers at 50mph. 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. A. use light, steady pressure on the brake pedal The A-dolly has a single drawbar with a single, centered hitching point. The road is dry, and visibility is good. Doubles/triples flip flop over from quick steering moves more easily than many vehicles. 4. A Flammable materials in the front trailer then it must have the placards on that trailer. 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. the converter dolly air tank drain valve on couple double/triple trailers should be: to check if the converter dolly is securely coupled to the rear trailer you should: pull gently against the pin of the second trailer. The couplers have a rubber seal that prevents air from escaping. 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 The heavier trailer should be in the rear. When does the "driver's manual" advise disconnecting the steering axle brakes to help keep the rig straight? You can find it here: High Road 2.0. 1. You may not notice a major leak in the service line until you try to put the brakes on. This is CDL Doubles and Triples Test 3in our original Classic Mode. The emergency brakes come on whenever the air supply knob is pulled out or the trailer is disconnected. Never unlock the pintle hook with the dolly still under the rear trailer. You should be sure the converter dolly air tank drain valves are _____ and the pintle hook is ____. B When uncoupling doubles or triples, what is important to know about unlocking the pintle hook? It is extremely unlikely you will drive a trailer built before 1975, but for the written exam, you still may need to know that trailers built before 1975 were not required to have spring brakes. which of these statements about quick steering movements and doubles/triples is true? B. johnson bar Watch the wording of the question AND the answers A safe driver will look for all of the above. Which of these statements about the handling of doubles and triples is true? rear brakes will not work properly. For emergency braking you should: which of these statements about emergency steering is true? You open the emergency line shut-off valve at the rear of the last trailer and hear air escaping. 0000008894 00000 n 7.3 Inspecting Doubles and Triples = Additional Things to Check During a Walkaround Inspection. Sometimes, metal tags are attached to the lines with the words service and emergency stamped on them. You should keep at least ____ seconds of space ahead of you. For all brakes to work on a triple combination, you must have air supply? The driver must yield the right-of-way to other vehicles when merging and when entering a highway from an alley. 1. On a triple combination, the shutoff valves at the rear off the middle trailer should be? Please use the form below to contact our customer service or sales team. The rear trailer of a double You should keep at least ___ seconds of space ahead of you. Visually check to make sure that the rear trailer is slightly lower than the center of the When driving a double or triple trailer, greater care must be given to. None of the above, 5. 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. A major leak in the emergency line will cause the tractor protection valve to close and the trailer emergency brakes to come on. 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. A bent or damaged kingpin on a coupling should be? These dollies will have a yellow lamp on the left side of the dolly Questions You Should Know For Doubles And Triples 1. In bad weather, slippery conditions and mountain driving, you must be especially careful if you drive double and triple bottoms. Locking jaws closed on You should keep at least ____ seconds of space ahead of you. B. you can almost always stop more quickly than you can turn Go to the rear of second trailer and open the emergency line shut-of valve. To help avoid mistakes, colors are sometimes used. 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. B. slow to a safe speed before entering the curve, then accelerate slightly through it - Converter dolly air tank drain valve: CLOSED. Which of the following will occur? Safety should never take second place, so know your stuff! The dolly tow bar may fly up, possibly causing injury, and making it very difficult to Make sure you have large enough gaps before entering or crossing traffic. When you do this, you should hear: you are driving with double trailer and must use your brakes to avoid a crash. Each trailer and converter dolly has one or more air tanks. allow "much more space than is needed for ideal driving conditions". Ensuring the safety of the public starts with a thorough inspection of all equipment. 1/3 For example: If you are traveling 60 MPH and it begins to rain, your suggested Our normal business hours are Monday-Friday 8 a.m. to 5 p.m. (Pacific Time). Tips for Backing Up a Trailer Like a Pro Trucker. locked . Check them all. You should be sure the converter dolly air tank drain valves are _______ & the pintle hook is __________. will have a lamp on the drivers side. This has the same value as the %%TIME_ALLOWED%% Variable on the Final Screen. Try our free CDL Doubles and Triples Test Question and Answers Quiz online. These trailers have no parking brake. 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. 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 Doubles and triples are more likely to turn over than other combination vehicles because of what effect? 9 Some vehicles have dead end or dummy couplers to which the hoses may be attached when they are not in use. Always test the trailer brakes before driving with the hand valve or by pulling the air supply (tractor protection valve) control. The road is dry and visibility is good. B Closed, free, 8. A. always keep your vehicle to the right side of your lane Calculate the Mach number at section 2. Also available in App Store & Google Play. The road is dry and the visibility is good. 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. Nothing will happen, but an in-cab warning indicator will let you know about the problem, It will cause the tractor protection valve to close and the trailer emergency brakes to come on, It will cause the tractor protection valve to open and the trailer emergency brakes to come on, When you try to put the service brakes on, air will quickly leak and will lower the air tank pressure, possibly activating the trailer emergency brakes, The emergency brakes will come on automatically as soon as a major leak occurs, Nothing, but braking power will be reduced, Air pressure will quickly leak away, even if you are not using the service brakes, Using a combination of the emergency air line and the service air line, Supply air will be sent to the service line instead of going to charge the trailer air tanks which means the trailer spring brakes will not release, Newer vehicles automatically detect if the lines are crossed and will auto-correct itself, Air will continue filling the air holding tanks until the tanks rupture from excessive pressure, Supply air will cause all brakes to release and the truck will roll freely without any braking ability, Trailers typically do not have their own air tanks, Designed to turn off the truck engine when a brake failure occurs, Used in the service and supply air lines at the back of trailers used to tow other trailers, Placed at each trailer spring brake and are designed to engage the emergency brakes when air pressure becomes too high, The yellow and red air control knobs located in the cab of a truck, Used to secure the trailer kingpin to the tractor 5th wheel, Caps which cover the valve stems on tires, A name for the yellow and red air valves in the cab of a truck, Coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer, Email Updates When New Articles Are Posted. This has the same value as the %%TOTAL%% Variable on the Final Screen. A. for coupled doubles and triples, be sure that the pintle hook is in the open position Converter dollies: A. you can steer more quickly and safely if you hold the wheel with one hand When checking your air lines, they must be secure and? You are driving with double trailers and must use your brakes to avoid a crash. 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. How do you check to make sure trailer height is correct before coupling? C You should reduce your speed by about _____ on a wet road. 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 None They are not only longer, but also need more space because they cannot be turned or stopped suddenly. C. engaging the tractor valve protection control, You must drive through deep or flowing water. Email Updates When New Articles Are Posted. What do you check when making a visual check of coupling? A truckers workspace is a small moving office Read More. C. posted speed limits on curves are safe for all trucks, Empty trucks: ), a 15 year truck driving veteran, in January 2007. The lighter semitrailer should be in first position behind the tractor. You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. When coupling twin trailers, you should _______ the pintle hook and secure the dolly support in the _______ position. The trailer height is right when: The trailer will be raised slightly when the converter dolly is backed under it. They provide the air pressure used to operate trailer brakes. B For emergency braking you should: A Push the brake pedal as hard as you can and hold it there B True or False? Should I Be A Truck Driver? You should be sure the converter dolly air tank .