the converter dolly air tank drain valve should be

If you do, the brakes may not work correctly. A dolly is like a very short trailer, with a ring hitch on the front and a fifth wheel on top. 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. Always test the trailer brakes before driving with the hand valve or by pulling the air supply (tractor protection valve) control. Correct answer percentage. Visually check to make sure that the lead trailer is slightly higher than the center of When you're trying to correct a drive-wheel braking skid why should you stop braking? 1/3 For example: If you are traveling 60 MPH and it begins to rain, your suggested 0000005345 00000 n D C. open, except the one connected to the rear trailer should be closed, During normal operation the brakes on double and triple trailers are controlled by the: The air lines will rupture B. you can almost always stop more quickly than you can turn You are driving a 100-feet truck with double trailers at 30 mph. Never, 9. The road is dry and visibility is good. The converter dolly is an auxiliary axle with a coupling device. Closed, free, 8. There are more things that can go wrong, and doubles/triples are less stable than other commercial vehicles. The pressure in the service line is controlled by the brake pedal and the trailer hand brake. you are visually checking the coupling of a converter dolly to the rear trailer. The shut off valves, when in the open position, allows air to flow out to another trailer. Wait for air pressure to reach normal, then push in the red trailer air supply knob. 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. B. slightly raised A. fully lowered You must treat a flashing red signal as you would treat a STOP sign. 10 ADVERTISEMENT ADVERTISEMENT Make sure you can hear air escaping with the valve closed. 0000004668 00000 n Do converter dollies have spring brakes? Tips for Backing Up a Trailer Like a Pro Trucker. 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? If you want to couple a second trailer to your combination vehicle, secure it by using: The crack-the-whip effect that troubles trucks with trailers is most likely to cause a tip over: You are driving on a slippery road during the day. Hit the article to see the way to back up your trailer like a pro! Typically depends on the axle count. If you crossed the air lines, you could drive away, but you would not have trailer brakes. What do you check when making a visual check of coupling? 0000007508 00000 n Any time you have to If loading fails, click here to try again. 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. 0000008915 00000 n Converter dollies: 27. 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 can and will get stuck on a raised railroad crossing. 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. This would be very dangerous. Each tank has a drain valve on it, and you should drain each tank every day. Explore now! paramount to safe driving. Air pressure is sent from the air tanks to the brakes by relay valves. 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. A. make things look smaller and farther away than they really are 1. All material on this website is copyrighted. When driving a truck with more than one trailer, which trailer should be first behind the truck? How can you test that air flows to all trailers? When uncoupling, you should never unlock the _______ with the dolly still under the rear trailer. The shut off valves prevent air from going any further. When checking the fifth wheel, you should make sure that it has enough? 0000003977 00000 n The best way to keep brakes from getting to hot while going down long grades is to: Go slow and use only light, steady pressure on the brakes. Park the rear trailer against another trailer, chock the tires and lock the trailer A In order to receive your Doubles and Triples endorsement, it is required that you pass the state's official CDL written Knowledge exam. If your converter dolly has to be moved over a distance to bring it to your semitrailer, you should? How do you check to make sure the trailer height is correct before coupling? A full trailer behind a truck You should NOT: You are driving a set of doubles and a set of trailer wheels goes into a skid. The dolly tow bar may fly up, possibly causing injury, and making it very difficult to Terms in this set (43) Converter dollies are used to connect: A tractor-trailer combination to another trailer. For emergency braking you should: All other trailer air functions use the emergency line. 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? 0000008894 00000 n re-couple, You can if you want to, it does not matter. air throughout the system. rear brakes will not work properly. 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. Your vehicle is so long that you must swing wide to make the turn. and the converter dolly air tank drain valve should be _____. You should avoid traveling next to others when possible. B. pull gently against the pin of the second semitrailer 0000010705 00000 n 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. What should you check for when inspecting a converter dolly? Also available in App Store & Google Play. B. are the easiest to stop since there is no shifting cargo True! Pickup at South Loop. You are visually checking the coupling of a converter dolly to the rear trailer. The service brakes slowly move to the fully applied position When only pulling one trailer, be sure the shut-off valves are all in the fully closed position. You are driving with double trailers and must use your brakes to avoid a crash. There is no obligation whatsoever. Air escape from the open valve Antilock Braking Systems on Converter Dollies, Converter dollies built on or after March 1, 1998, are required to have antilock brakes. Remember, the service line is not used unless you depress the brake pedal or use the trailer hand valve. 0000001107 00000 n At section 2 downstream, the speed is 519 m/s. This has the same value as the %%SCORE%% Variable on the Final Screen. Also, this page requires javascript. When does the "driver's manual" advise disconnecting the steering axle brakes to help On the middle trailer of a set of triples? The road is dry and visibility is good. Air will not be available to release the trailer spring brakes (parking brakes). All trademarks are property of their respective owners. There is no obligation whatsoever. Open, free Which trailer should come first behind the tractor? to do this without wheel chocks you should: supply air to the trailer air system with the tractor and then disconnect the emergency line. d. protein. Chock the tires, park on level ground and charge the trailer air tank if it does The emergency brakes come on whenever the air supply knob is pulled out or the trailer is disconnected. You should reduce your speed by about _____ on a wet road. The converter dolly air tank drain valve on coupled double/triple trailers should be: Closed. Why should you use chocks when parking a trailer without spring brakes? When uncoupling doubles or triples, what is important to know about unlocking the pintle hook? The coupling between a rear trailer and a dolly should have a space between the upper and lower fifth wheels of? Simply click in your answer to each CDL practice test question. This will supply air to the emergency (supply) lines. Provides a snug fit to eliminate unwanted seepage of air or water. The last trailer in a combination is most likely to turn over. Converter dolly air tank drain valve: CLOSED Air lines supported and glad hands properly connected. Which the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the trailer. Locking jaws open Tractor-trailers are considered combination vehicles. Go to the rear of second trailer and open the emergency line shut-of valve. Converter dolly air tank drain valve: CLOSED. It is important to check the height of the trailer before connecting a converter dolly to a trailer. These mirrors: Make things seem smaller and further away than they really are. C. 3, You are doing a walk around inspection of a double or triple trailer rig. second trailer will be connected, The dolly will have a yellow lamp on the left side, The dolly will have a yellow lamp on the right side, The dolly will have a red lamp on the left side, The dolly will have a red lamp on the right side. B. utilize the brakes. The rear trailer does not have shut-off valves. A. use light, steady pressure on the brake pedal Any items you have not completed will be marked incorrect. There is more chance for skids and loss of traction. C. foot pedal, Which of these statements about managing space to the sides is true? axle will have spring brakes due to the weight of the unit. They provide the air pressure used to operate trailer brakes. Which diagram shows the best way to turn? 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. 0000006836 00000 n For emergency braking you should: A Push the brake pedal as hard as you can and hold it there B When checking your air lines, they must be secure and? B Should the shut off valves on the rear of the first trailer be open or closed on a set of double trailers? B A turn of the glad hand attached to the hose will join and lock the couplers. For emergency braking you should: Use controlled or stab braking Converter dollies: Often do not have spring brakes The crack the whip effect that troubles trucks with trailers. A Connect the Converter Dolly to the Rear Trailer: Test the coupling by pulling against the pin of the second semitrailer. What will happen if there is a major leak in the service air line? A. opening the air tank petcock 9 Questions You Must Ask, Decide if Truck Driving is The Correct Career Path, Do Not Sell or Share My Personal Information. True or False? After 15 years on the road I wanted to help people understand the trucking industry and everything that came with the career and lifestyle of an over the road trucker. These trailers have no parking brake. 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: D Trucks with trailers have a dangerous crack-the-whip effect. A. require shorter stopping distances than full ones These dollies will have a yellow lamp on the left side of the dolly. This is CDL Doubles and Triples Test 3in our original Classic Mode. Some vehicles have dead end or dummy couplers to which the hoses may be attached when they are not in use. What should you check for when inspecting the converter dolly and the pintle hook? True False True If you want to couple a second trailer to you combiantion vehicle, secure it by using the: Trailer emergency air brakes. Driving doubles/triples is also more dangerous in hot and cold weather driving, as well as on mountain roads. ), a 15 year truck driving veteran, in January 2007. to re-capture it. C A major leak in the emergency line will cause the tractor protection valve to close and the trailer emergency brakes to come on. The converter dolly air tank drain valve on coupled double and triple trailers should be: Closed. You can also reach us at (888) 830-2326. A 0000010285 00000 n You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. Close the emergency line shut-off valve at the rear of the trailer. A converter dolly is still under the second trailer when you unlock the pintle hook. Email Updates When New Articles Are Posted. CDL License Requirements State By State. You are doing a walk around inspection of a double or triple trailer rig. You should keep at least ____ seconds of space ahead of you. Speed for other vehicles is often too fast for a multi-combination unit! Trailer Air Tanks And Shutoff Valves - Page 50. What is one function of the tractor protection valve? When you go to the rear of the last trailer, what should you do to complete this check? While inspecting your converter dolly coupling, you should make sure there is _______ between the upper and lower fifth wheel. kingpin. What three methods can you use to secure a second trailer before coupling? Each trailer and converter dolly has one or more air tanks. C. closed; unlatched, Which of these will result in the best control on a curve? When coupling twin trailers, you should _______ the pintle hook and secure the dolly support in the _______ position. Should the converter dolly air-tank drain valve be open or closed on a double trailer combination? The pressure in the service line tells how much pressure the relay valves should send to the trailer brakes. B. keep other traffic out of your side space Flammable materials in the front trailer then it must have the placards on that trailer. 9. 7.3 Inspecting Doubles and Triples = Additional Things to Check During a Walkaround Inspection. then there is a problem with the ABS system. 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. CDL Doubles and Triples Test Question and Answers 2023 [PDF]: Commercial Drivers License Doubles and Triples Endorsements Knowledge Test. rear trailer. how much space should be between the upper and lower fifth wheel? B. the emergency line valve open and release air 0000003998 00000 n Help your friends discover what it takes to become a successful truck driver. mTouch Quiz will automatically populate the fields below. 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. 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. Safety should never take second place, so know your stuff! Allow much more space than is needed for ideal driving condition. Visually check to make sure that the rear trailer is slightly lower than the center of the 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? 5. 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. Doubles and triples must be driven very smoothly to avoid rollover or jackknife. When checking the coupling system, make sure that the locking jaws are around the shank of the. If you do, there is a problem. Air flows steadily and isentropically through a passage. Open, latched You must stop, yield to traffic and pedestrians, and only proceed when safe. The dolly tow bar may fly up, possibly causing injury and making it very difficult to re-couple. Pull gently against the pin of the second trailer. not have spring brakes. A. air escape from the open valve 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. To prevent trailers from rolling over, you must steer gently and go slowly around corners, on ramps, off ramps and curves. We have a new version of this program. Go to the rear of the rig. Should the shut-off valves on the trailers be open or closed on a set of double trailers? A. open Your tractor protection valve control should pop out, or go from normal to emergency position, when air pressure falls into what range? High Road 2.0! This has the same value as the %%PERCENTAGE%% Variable on the Final Screen. The road is dry and visibility is good. Therefor, if there is a major leak in your service line, you may not know it until you try to use the service brake. You are driving with more than one trailer. The dolly tow bar may fly up You should hear air escaping, showing the entire system is charged. Study section 6.2 if you can't answer all of these questions. The dolly will have a yellow lamp on the drivers (left) side. Once you have coupled your rear trailer, you should test the coupling by? Delivering to. 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 _______. 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. What does the Driver's manual say about how much space you should keep ahead of your truck? How much space should be between the upper and lower fifth wheel? unsafe slow down even further, or better yet, find a safe haven and park until the 2. When driving doubles or triples how should they be driven to avoid rollover or jackknifing: What does the Commercial Driver Handbook say about how much space you should keep ahead of your truck? How do you know if your converter dolly is equipped with antilock brakes? You are driving a 100 ft twin trailer combination at 50 mph. Use only the trailer brakes The trailer brakes will unlock On the first trailer in a set of doubles? 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. Take special care when pulling two and three trailers. 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. 0000001162 00000 n You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. What happens if you cross the Emergency Air Line and the Service Air Line? B 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. We wish you the best of luck in your endeavors and are pleased to be of assistance. D 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. Use the dummy couplers when the air lines are not connected to a trailer. If spare tire is on converter gear (dolly), make sure it is secured. B. you should avoid traveling next to others whenever possible Then, the air loss from the leak will lower the air tank pressure quickly. The road is dry and the visibility is good. You should not hear air escaping. 4. Which of these is NOT a good thing to do when driving on slippery roads? View More Details. Open What types of trailers can get stuck on raised crossings? We are an independent company focused on providing valuable motor vehicle and permit practice test information. 0000010306 00000 n The converter dolly air tank drain valve on coupled double/triple trailers should be: Answer: Closed. 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: This has the same value as the %%WRONG_ANSWERS%% Variable on the Final Screen. You should be sure the converter dolly air tank . Never unlock the pintle hook with the dolly still under the rear trailer. 1/2 to 3/4 of an inch "Glad hands" are coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer. Which of these statements about managing space to the sides is true? B. do not need to be checked as often as flat mirrors because they show a larger area Locking jaws closed on The last trailer in a combination is most likely to turn over. some large trucks have curved (convex or spot) mirrors. A 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 the handling of doubles and triples is true ? If you feel Those that do not have spring brakes have emergency brakes that work from the air stored in the trailer air tank. the trailer height is right when: the trailer will be raised slightly when the converter dolly is backed under it. 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 should be sure the converter dolly air tank drain . What should you check for when inspecting the converter dolly?