The total number of questions. D What does the drivers manual say about how much space you should keep ahead of your truck? When does the Driver's manual say you should disable the steering axle brake? PDF Doubles and triples 1. The stopping distance for a tractor trailer The last trailer in a combination is most likely to turn over. If you do, the brakes may not work correctly. Otherwise, the dolly tow bar may fly up, possibly causing injury and making it very difficult to re-couple. 0000003977 00000 n Connect the Converter Dolly to the Rear Trailer: Test the coupling by pulling against the pin of the second semitrailer. 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? The road is dry and visibility is good. 0000003261 00000 n Some vehicles have dead end or dummy couplers to which the hoses may be attached when they are not in use. You MUST have air all the way to the back for all the brakes to work. A 360 degree area of awareness is 5. How can you test that air flows to all trailers? HK Extended Tank Drain Assembly Kit with 10 Inch Braided Steel Hose 1/4 Inch Drain Valve and Elbow Fitting for Air Compressor 4.7 (463) $1499 FREE delivery Thu, Mar 9 on $25 of items shipped by Amazon Small Business All Tool Depot Air Compressor Drain Valve Replacement for Craftsman Petcock 072-0001, 072-0006 (1-Pack) 4.2 (20) $649 rear brakes will not work properly. True! Make sure pintle hook is latched. The road is dry, and visibility is good. Which of the following must be connected when coupling tractor to trailer or trailer to trailer? 1. None of the above, 5. The converter dolly air tank drain valve on coupled double/triple Question 3 Explanation: All of the above. What happens when there is a major leak in the emergency air line? What is a converter dolly? What is likely to happen? If there is a trailer Charge the system and pump the brakes with the window down. C When you go to the rear of the last trailer, what should you do to complete this check? Use controlled or stab braking What value of channel width must the design use? You wish to turn right from one two-lane, two-way street to another. C. use controlled or stab braking, The best way to stop any skid is to: You are doing a walk around inspection of a double or triple trailer rig. A) one inch of space . Locking jaws closed on D The dolly will have a yellow lamp on the drivers (left) side. Any items you have not completed will be marked incorrect. 0000006015 00000 n You are driving with double trailers and must use your brakes to avoid a crash. You open the emergency line shut-off valve at the rear of the last trailer and hear air escaping. The driver must yield the right-of-way to other vehicles when merging and when entering a highway from an alley. 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. cell C To do this without wheel chocks you should: Empty trucks: When parking your double or triple combination, you should look for a parking space To test the tractor protection valve, charge the trailer air brake system, turn off the engine, and You are doing a walk around inspection of a double or triple trailer With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. What should you check for when inspecting the converter dolly and the pintle hook? Speed for other vehicles is often too fast for a multi-combination unit! To do this without wheel chocks you should: Empty trucks: When parking your double or triple combination, you should look for a parking space Air escape from the open valve Describe what the trailer air supply control does. If the spring brakes do not release when you push the trailer air supply control, check the air line connections. Dobles - Triples Pruebas de prctica 3 - NJ 2023 - CristCDL.com 11 During normal operation the brakes of the double/triple trailer are controlled by: There are more critical parts to check when you have two or three trailers. You should not hear air escaping. 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. Disconnect the glad-hand at the front of the first trailer and listen for air flow. A If you do, there is a problem. How can you test that air flows to all trailers? True! Therefore, look far ahead so you can slow down or change lanes gradually when necessary. Please visit using a browser with javascript enabled. [California Commercial Driver Handbook] The weight of a truck: Is a major factor affecting stopping distance. C All material on this website is copyrighted. Push the brake pedal as hard as you can and hold it there CDL Doubles & Triples Practice Test 3 - Classic Mode - Trucker Country Open the emergency line shut-off valve at the rear of the last trailer. D Should the shut-off valves on the rear of the last trailer be open or closed? 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? When uncoupling the converter dolly Why should you never unhook the 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 Clean the couplers and rubber seals before a connection is made. You should keep at least ____ seconds of space ahead of you. 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). Flashcards - Doubles Triples Test #3 - FreezingBlue You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. The puzzle: At the far left edge, the plates are in contact, so the path length difference between rays 222 and 333 is zero. The Home Depot Logo When testing trailer service brakes, you should use? The Verge logo. Check them all. symptoms of a bad fuel tank selector switch. If your tanks have automatic drains, they will keep most moisture out, but you should still open the drains to make sure. A. for coupled doubles and triples, be sure that the pintle hook is in the open position When checking your air lines, they must be secure and? They are filled by the emergency (supply) line from the tractor. . when driving a truck with more than one trailer, which trailer should be first behind the truck? A dolly should be pulled out from a rear trailer using? you want to hook your combination to a second trailer that has no spring brakes. Slow to a safe speed before entering the curve, then coast through the curve. 1/2 to 3/4 of an inch weather passes. That there is no space between upper and lower sixth wheel. A. always keep your vehicle to the right side of your lane For all brakes to work on a triple combination, you must have air supply? will have a lamp on the drivers side. Mar 2 - Mar 3. If you leave this page, your progress will be lost. This has the same value as the %%TOTAL%% Variable on the Final Screen. Free CDL - Doubles and Triples Flashcards | Quizlet A. use the engine brake or speed retarder You should be sure the converter dolly air tank drain valves are _______ and the pintle hook is _____. Unless you are draining the condensation out of the air tank, then the drain valve C A Open, latched B Open, free C Closed, latched D Closed, free 28. Air pressure is sent from the air tanks to the brakes by relay valves. CDL Practice Tests 2023 - Doubles And Triples Leave a Reply Cancel reply - Free CDL Practice Tests 2022 B. allow one vehicle length for every 10,000 lbs of gross vehicle weight the fifth wheel, so trailer is raised slightly when dolly is pushed under it. 27. Never pull any trailer without visually inspecting the fifth wheel locking bar 9. 8. Which of these statements about the handling of doubles and triples is true? Time limit varies by state. A paramount to safe driving. On the first trailer in a set of doubles? Provides a snug fit to eliminate unwanted seepage of air or water. There is a school zone ahead. B. you should avoid traveling next to others whenever possible You should reduce your speed by about _____ on a wet road. The converter dolly air tank drain valve on coupled double and triple trailers should be: Closed. The heavier trailer should be in the rear. which of these statements about the handling of doubles and triples is true ? [California Commercial Driver Handbook] The weight of a truck: Is a major factor affecting stopping distance. Remember: The trailer air brakes are supplied with air using the emergency line (also called the supply line). These mirrors: make things seem smaller & further away then they really are. Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? Which f these will result in the best control on curves? When you're finished, check your score and results. 10. These mirrors: Make things seem smaller and further away than they really are. These mirrors: Therefor, if there is a major leak in your service line, you may not know it until you try to use the service brake. Select the answer that correctly completes each statement. Which is most likely to tip over: Air escape from the open valve You are driving with double trailers and must use your brakes to avoid a crash. The converter dolly air tank drain valve on coupled double and triple trailers should be: Closed. Like a trailer, a dolly equipped with ABS will have a yellow indicator light on the left side. Which of these is most likely to occur? 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 behind the shut-off valve then they need to remain open. The tanks will hold enough air to allow the brakes to be used several times even if the compressor stops working. Did you know you can fill out one quick form here on TruckingTruth and apply to several companies at once for paid CDL training? Which of these are the correct positions for shut-off valves in doubles and triples? 0000003998 00000 n Take special care when pulling two and three trailers. 0000005733 00000 n 0000001582 00000 n On a triple combination, the shutoff valves on the rear of the last trailer should be? not have spring brakes. While inspecting your converter dolly coupling, you should make sure there is _____ between the upper and lower fifth wheel. B A turn of the glad hand attached to the hose will join and lock the couplers. What three methods can you use to secure a second trailer before coupling? Trailer Air Tanks And Shutoff Valves - Page 50. To uncouple the rear trailer in a set of doubles, the shut-off valve at the rear of the front trailer should be: Closed. 0000001162 00000 n you should keep atleast __seconds of space ahead of you. If there are no dummy couplers, the glad hands can sometimes be locked together (depending on the couplings). You should NOT: If you crossed the air lines, you could drive away, but you would not have trailer brakes. A. Doubles and triples must be driven very smoothly to avoid rollover or jackknife. B. are the easiest to stop since there is no shifting cargo What should you check for when inspecting a converter dolly - Answers C. the service brakes slowly move to the fully applied position, Some large trucks have converted or "spot" mirrors. When uncoupling doubles or triples, what is important to know about unlocking the pintle hook? Try our free CDL Doubles and Triples Test Question and Answers Quiz online. If it goes low enough, the trailer emergency brakes will come on. Allow much more space than is needed for ideal driving condition. 0000007032 00000 n You must steer gently when pulling trailers. 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 _____. Calculate the voltage gain of each. There is no requirement or exact standard for color coding. 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. Your tractor protection valve control should pop out, or go from normal to emergency position, when air pressure falls into what range? To check air flows to all trailers, you should let air pressure reach normal then? You should avoid traveling next to others when possible. 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. Ensuring the safety of the public starts with a thorough inspection of all equipment. If spare tire is on converter gear (dolly), make sure it is secured. Compressed air usually has some water and some compressor oil in it. Visually check to make sure that the lead trailer is slightly higher than the center of 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. Which trailer should come first behind the tractor? Flammable materials in the front trailer then it must have the placards on that trailer. B. slightly raised with the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the trailer. Closed, latched Dont hesitate to take advantage of our practice tests in each category specific to your needs. The rear trailer of a double 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. 2) the second test is to go out to the trailer to ensure that the parking brakes have indeed applied. These valves permit closing the air lines off when another trailer is not being towed. The Doubles and Triples written CDL Exam is required for your doubles and triples endorsement. your vehicle is so long that you must swing wide to make a turn. C (done) Chp 23: Cash Flow + Working Capital, Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer. 1) the first one is to pump down the air pressure in the system between 20 and 45psi (pounds per square inch) the trailer air supply will pop out, shutting air off to the trailer. You should check the height of the trailer before connecting a converter dolly to a second or third 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. Each tank has a drain valve on it, and you should drain each tank every day. Take this same test in our other testing modes How to Get a Hazardous Materials Endorsement, What is a CDL? 0000005345 00000 n Time allowed (Requires timer add on). 0000006195 00000 n 0000001107 00000 n The road is dry and visibility is good. A. completely open None of the above, 4. If a converter dolly is still under the second trailer and you unlock the pintle hook, what will probably happen? The application only takes one minute. A. you can steer more quickly and safely if you hold the wheel with one hand 1/32 to 3/32 of an inch. You are driving a 100 foot twin trailer combination at 50 mph. ADVERTISEMENT ADVERTISEMENT Pintle hook latched. 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: You are doing a walk around inspection of a double or triple trailer rig. Closed, free, 8. Once you are finished, click the button below. Hb```f``b`c``e@ (Q6_* the crack-whip effect that triubkes trucks with trailers is most likely to cause a tip over when. Make a sketch that explains this phenomenon in terms of a feedback loop . The converter dolly air tank drain valve on coupled double/triple trailers should be: Answer: Closed. When the road is slippery When you are pulling trailers, which of the following statements is true about steering? 0000005664 00000 n The converter dolly is an auxiliary axle with a coupling device. can and will get stuck on a raised railroad crossing. Delivering to. Nothing, the weight of the trailer will keep it in place, 10. Locking jaws closed on 2003-2023 Chegg Inc. All rights reserved. A C The pressure in the service line is controlled by the brake pedal and the trailer hand brake. Definition. Be sure pintle-eye of dolly is in place in pintle hook of trailer(s). Antilock Braking Systems on Converter Dollies, Converter dollies built on or after March 1, 1998, are required to have antilock brakes. Contributor: Luke Nold (Experienced truck driver for 5+ years and published writer for Fleet Magazine). TestPermit.com provides free unofficial review materials for a variety of exams. air throughout the system. You shouldn't stop braking. 0000008894 00000 n what is likely to happen if the pintle hook is unlocked with the dolly still under the second trailer? how can you be sure you supplied air to a second trailer? 7. All rights reserved Site Map. the rig will continue moving in a straight line no matter how much the steering wheel is turned. 0000009556 00000 n When coupling twin trailers, you should _______ the pintle hook and secure the dolly support in the _______ position. which of these is not a good thing to do when driving on slippery roads? When inspecting doubles and triples you must make sure there is air all the way to the back of the last trailer, otherwise what may not work?