If spare tire is carried on converter gear (dolly), make sure it's secured. B. the emergency line valve open and release air You must steer gently when pulling trailers. The road is dry and visibility is good. There is a school zone ahead. You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. PDF Doubles and triples 1. The stopping distance for a tractor trailer c. iron 10. [California Commercial Driver Handbook] The weight of a truck: Is a major factor affecting stopping distance. 0000003977 00000 n You may be timed. 3. The heaviest trailer Please wait while the activity loads. 1/32 to 3/32 of an inch. Like a trailer, a dolly equipped with ABS will have a yellow indicator light on the left side. Should the shut-off valves on the rear of the last trailer be open or closed? Converter dolly air tank drain valve: CLOSED. When checking the fifth wheel, you should make sure that it has enough? You should be sure the converter dolly air tank drain valves are _____ and the pintle hook is ____. The braking systems of double and triple trailers are different than those of straight trucks because doubles and triples. Leave a Reply Cancel reply - Free CDL Practice Tests 2022 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. Be more careful in adverse conditions. When coupling twin trailers, a converter dolly is. b. cell Which of these is most likely too occur? open, closed, closed: Term. 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Speed for other vehicles is often too fast for a multi-combination unit! At section 2 downstream, the speed is 519 m/s. DOUBLE/TRIPLE CDL Flashcards | Chegg.com the fifth wheel, so trailer is raised slightly when dolly is pushed under it. Before coupling a trailer, you should make sure it is at the right height using? 9. The service brakes slowly move to the fully applied position When coupling, be sure to couple the proper glad hands together. 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. If one air system is very low on pressure _______. Submit your email at the end of the test. A. use light, steady pressure on the brake pedal View More Details. On the first trailer in a set of doubles? which of these statements about quick steering movements and doubles/triples is true? 0000003261 00000 n Park the rear trailer against another trailer, chock the tires and lock the trailer Visually check to make sure that the rear trailer is slightly lower than the center of the 5. It depends on the load 1 If this activity does not load, try refreshing your browser. You must treat a flashing red signal as you would treat a STOP sign. ADVERTISEMENT ADVERTISEMENT C. use controlled or stab braking, The best way to stop any skid is to: The converter dolly air tank drain valve on coupled double/triple trailers should be: Answer: Closed. Hazardous materials must be placarded on all four sides of EACH Trailer. "Glad hands" are coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer. Which the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the trailer. A CDL is required to drive any of the following vehicles: A vehicle with two separate parts - the power unit (tractor) and the trailer. 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. How do you check to make sure trailer height is correct before coupling? Why should you use chocks when parking a trailer without spring brakes? CDL Doubles and Triples Test Question and Answers 2023 [PDF]: Commercial Drivers License Doubles and Triples Endorsements Knowledge Test. 0000010783 00000 n Why should you not use the trailer hand valve while driving? Use only the trailer brakes 0000006836 00000 n Safety chains secured to trailer (s). kingpin. Should the shut-off valves on the trailers be open or closed on a set of double trailers? Types of converter dollies. What happens if you cross the Emergency Air Line and the Service Air Line? 1. A converter dolly is a piece of equipment designed to allow commercial trucks, such as semi-trucks, to pull a trailer. Air pressure is sent from the air tanks to the brakes by relay valves. B. pull gently against the pin of the second semitrailer You should be sure the converter dolly air tank drain valves are _______ and the pintle hook is _____. 0000003998 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 C. closed, You can release the dolly brakes by: By clicking on "Sign Up", you agree to our Terms of Use and Privacy Policy. Make sure the converter dolly air tank drain valve is closed. C. add "one car length for every 10 mph", Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer, Incidental Motions & Motions that Bring a Que. Which of the following will probably happen if you are driving a double rig and a set of trailer wheels goes into a skid? A You should keep at least ___ seconds of space ahead of you. 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. trailer << /Size 59 /Info 20 0 R /Root 22 0 R /Prev 29211 /ID[] >> startxref 0 %%EOF 22 0 obj << /Type /Catalog /Pages 19 0 R >> endobj 57 0 obj << /S 66 /Filter /FlateDecode /Length 58 0 R >> stream Pull gently against them in a low gear to make sure the brakes work. can and will get stuck on a raised railroad crossing. The DMV doubles triples practice test will examine your knowledge of pulling double/triple trailers, coupling and uncoupling, inspecting doubles and triples, and checking air brakes. Tractor-trailers are considered combination vehicles. We are an independent company focused on providing valuable motor vehicle and permit practice test information. Please visit using a browser with javascript enabled. This will supply air to the emergency (supply) lines. The last trailer in a combination is most likely to turn over. What should you check for when inspecting the converter dolly? Antilock Braking Systems on Converter Dollies, Converter dollies built on or after March 1, 1998, are required to have antilock brakes. 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; . when does the drivers manual say you should disable the steering axle brakes? This would be very dangerous. Which of these are the correct positions for shut-off valves in doubles and triples? Then, the air loss from the leak will lower the air tank pressure quickly. Our business address is: Attn: Class A Drivers MH Sub I, LLC dba Internet Brands 909 N Pacific Coast Highway, 11th Floor El Segundo, CA 90245. 4. This section explains how important it is to be careful when driving with more than one trailer, how to couple and uncouple correctly, and about inspecting doubles and triples carefully. 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. Each trailer and converter dolly has one or more air tanks. NPT thumbscrew style design enables easy installation. They provide the air pressure used to operate trailer brakes. 0000001582 00000 n 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 B. These dollies will have a yellow lamp on the left side of the dolly Questions You Should Know For Doubles And Triples 1. Otherwise, the dolly tow bar may fly up, possibly causing injury and making it very difficult to re-couple. When turning a double or triple at an intersection, the turn often cannot be completed without swinging wide. How can you test that air flows to all trailers? 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. Should the converter dolly air-tank drain valve be open or closed on a double trailer combination? Make sure trailer height is correct. How do you know if your converter dolly is equipped with antilock brakes? What is the most common foundation brake found on heavy vehicles? The puzzle: At the far left edge, the plates are in contact, so the path length difference between rays 222 and 333 is zero. D C 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. Make a sketch that explains this phenomenon in terms of a feedback loop . Hook dolly to front trailer. Shut off valves are only used on trailers designed to be towed in conjunction with other trailers (doubles / triples). You want to lock your combination to a second trailer that has no spring brakes. You are driving a tractor with multiple trailers. You should check the height of the trailer before connecting a converter dolly to a second or third trailer. Pintle hook latched. Use the dummy couplers when the air lines are not connected to a trailer. It is important to check the height of the trailer before connecting a converter dolly to a trailer. How do you check to make sure the trailer height is correct before coupling? When uncoupling a rear trailer, your rig should be parked in a straight line on? 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 _____. cQ 220rd8bihuM#Om>G*Lz)g^\l9'A9/omf|b49U[@%jGT-QR6i. The dolly tow bar may flip up causing bodily injury and making it very difficult to how can you be sure you supplied air to a second trailer? B. slightly raised The heavier trailer should be in the rear. B. releasing the pintle hook When driving a double or triple trailer, greater care must be given to. What three methods can you use to secure a second trailer before coupling? A. you can steer more quickly and safely if you hold the wheel with one hand Typically depends on the axle count. D Doubles and triples are extremely prone to control issues and must be 0000009577 00000 n 11 During normal operation the brakes of the double/triple trailer are controlled by: you are driving a set of doubles and a set of trailer wheels goes in a skid. If you feel If the fifth wheel on a coupling is too far forward, the tractor frame may hit? The pintle hook should always be secure when the vehicle is in motion. If you do, there is a problem. Which of the following must be connected when coupling tractor to trailer or trailer to trailer? It is important not to let water and oil build up in the air tanks. Question 3 Explanation: All of the above. When testing trailer service brakes, you should use? 0000008894 00000 n When only pulling one trailer, be sure the shut-off valves are all in the fully closed position. More driving knowledge, questions and answers, online practice tests for obtaining a drivers . Explain why the waves that reflect from the far left edge of the plates in the given figure earlier exhibit destructive interference (zero intensity) at x=0x=0x=0. 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? 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. When you go to the rear of the last trailer, what should you do to complete this check? Any vehicle, regardless of size, designed to transport 16 or more persons, including the driver. We wish you the best of luck in your endeavors and are pleased to be of assistance. The Home Depot Logo You should hear air escaping, showing the entire system is charged. Email Updates When New Articles Are Posted. 1/4 in. CDL Doubles and Triples Test Question and Answers you are driving a 100ft truck eith double trailers at 50mph. Doubles and triples are more likely to turn over than other combination vehicles because of the "crack- the-whip" effect. Open the emergency line shut-off valve at the rear of the last trailer. What three methods can you use to secure a second trailer before coupling? should remain in the closed position. A. closed; latched Provides a snug fit to eliminate unwanted seepage of air or water. you want to hook your combination to a second trailer that has no spring brakes. To check air flows to all trailers, you should let air pressure reach normal then? Open the emergency line shut-off valve at the rear of the last trailer. B. keep other traffic out of your side space 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. Ship to Store. 0000001107 00000 n not have spring brakes. All rights reserved Site Map. Any trailer, 7. To check if the converter dolly is securely coupled to the rear trailer you should: Pull gently against the pin of the second trailer. A converter dolly is still under the second trailer when you unlock the pintle hook. Air flows steadily and isentropically through a passage. When you do this, you should hear: A. hand valve Check them all. These trailers have no parking brake. when driving a truck with more than one trailer, which trailer should be first behind the truck? Time used (Requires timer add on). You are driving with double trailers and must use your brakes to avoid a crash. locked . A dolly is like a very short trailer, with a ring hitch on the front and a fifth wheel on top. 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. Mar 2 - Mar 3. D Connect Converter Dolly to Rear Trailer Make sure trailer brakes are locked and/or wheels chocked. Do converter dollies have spring brakes? 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. Sometimes, metal tags are attached to the lines with the words service and emergency stamped on them. Open the emergency line shut-off valve at the rear of the last trailer. Charge the system and pump the brakes with the window down. Wait for air pressure to reach normal, then push in the red trailer air supply knob. What is a converter dolly? | Samsara The A-dolly has a single drawbar with a single, centered hitching point. Which of these statements about quick steering movements and doubles/triples is true? [Flashing Signals, Traffic Signals, Chapter 5 - Signals, Signs and Pavement Markings, North Carolina Driver's Handbook], One component of the DUI sentence in the state of Tennessee is twenty-four hours of litter pick-up wearing clothing that says "I am a drunk driver." CDL License Requirements State By State. Trailer Air Tanks And Shutoff Valves - Page 50. B How To Use Cruise Control Effectively As A Truck Driver. 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. Trucks with trailers have a dangerous crack-the-whip effect. Hit the article below to see specific information about AOBRDs! Number of wrong answers. A. open the shut-off valves at the rear of both trailers 0000002636 00000 n Doubles and triples are more likely to turn over than other combination vehicles because of what effect? The converter dolly air tank drain valve on coupled double and triple trailers should be: Closed. Converter dollies have spring brakes. 0000006195 00000 n then there is a problem with the ABS system. The emergency line valve open and release air They are not only longer, but also need more space because they cannot be turned or stopped suddenly. You should be sure the converter dolly air tank drain valves are _____ and the pintle hook is _____. You are driving with more than one trailer. A. use the engine brake or speed retarder Pull gently against the pin of the second trailer. 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. 3. True or False? 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. Select the answer that correctly completes each statement. Doubles and triples are more likely to overturn than other combination vehicles because of the whip cracking effect. 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? The road is dry and visibility is good. Take this same test in our other testing modes How to Get a Hazardous Materials Endorsement, What is a CDL? Double and Triples Part 1 Flashcards - flashcardmachine.com Did you know you can fill out one quick form here on TruckingTruth and apply to several companies at once for paid CDL training? CDL: Doubles/Triples Flashcards | Quizlet A dolly has lights, air tanks, air relays, air lines, air brakes, ABS, electrical connections, etc. B. are the easiest to stop since there is no shifting cargo On the middle trailer of a set of triples? Be certain you are clear at the sides before changing lanes. 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. If spare tire is on converter gear (dolly), make sure it is secured. B. open; latched weather passes. B Learn more and apply here: The more heavily loaded semitrailer should be in first position behind the tractor. On double and triple combinations, you must make sure that which of these is secure? Never, 9. Therefore, it is very important for safety that you use wheel chocks when you park trailers without spring brakes. Locking jaws closed on How should you test the coupling? In normal operation, trailer service brakes should be operated by? While inspecting your converter dolly coupling, you should make sure there is _______ between the upper and lower fifth wheel. You will speak with recruiters today. At TruckingTruth we'll help you decide if trucking is right for you and help you get your career off to a great start. Nothing, the weight of the trailer will keep it in place, 10. When uncoupling doubles or triples, what is important to know about unlocking the pintle hook? This has the same value as the %%WRONG_ANSWERS%% Variable on the Final Screen. Seriously! Which is most likely to tip over: Free CDL - Doubles and Triples Flashcards | Quizlet Driving doubles/triples is also more dangerous in hot and cold weather driving, as well as on mountain roads. Connect the Converter Dolly to the Rear Trailer: Test the coupling by pulling against the pin of the second semitrailer. 0000006383 00000 n Doubles Triples Endorsement Test Flashcards | Quizlet You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. The shut off valves prevent air from going any further. With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. Blue is used for the service lines, and red for the emergency (supply) lines. Do converter dollies have spring brakes? You should keep at least ____ seconds of space ahead of you. There is no requirement or exact standard for color coding. A full trailer behind a truck A thorough pre-trip inspection should catch any major service line leaks before you begin your trip. We have a new version of this program. The trailer is at the correct height when. How much space should be between the upper and lower fifth wheels? symptoms of a bad fuel tank selector switch. Our normal business hours are Monday-Friday 8 a.m. to 5 p.m. (Pacific Time). A connection device of one axle used to disconnect a semitrailer combination vehicle Each trailer and converter dolly has one or more air tanks. If the air supply in the trailer air tank has leaked away, there will be no emergency brakes, and the trailer wheels will turn freely. B C Related Question Question: What does this sign mean? Connect Converter Dolly to Front Trailer Back first semitrailer into position in front of dolly tongue. That there is no space between upper and lower fifth wheel. B. closed With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. C. slow to a safe speed before entering the curve, then coast through it, Which of these is NOT a good thing to do when driving on slippery roads? what is likely to happen if the pintle hook is unlocked with the dolly still under the second trailer? Sketch the shape of the passage between sections 1 and 2. For emergency braking you should: C Never unlock the pintle hook with the dolly still under the rear trailer. All other trailer air functions use the emergency line. To prevent trailers from rolling over, you must steer gently and go slowly around corners, on ramps, off ramps and curves. Converter dolly air tank drain valve: CLOSED Air lines supported and glad hands properly connected. 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. Stop the vehicle by gearing down and sparingly The road is dry and visibility is good. What three methods can you use to secure a second trailer before coupling? By using this site, you agree to be bound by our Terms of Use, Privacy Policy and Cookie Policy, Copyright 2000-2023 MH Sub I, LLC dba Internet Brands. and the converter dolly air tank drain valve should be _____. Because of this, which of the following vehicle parts is most likely to tip over? B. for doubles and triples, the fifth wheel should be all the way towards the tractor A. release the spring brakes and check for movement If you have traffic on both sides of your vehicle and something is blocking your lane, a move to the right still be best. 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. Lock pintle hook. CDL Doubles & Triples Practice Test 3 - Classic Mode - Trucker Country Go to the rear of second trailer and open the emergency line shut-of valve. 0000008187 00000 n Make sure pintle hook is latched. 0000010705 00000 n Pickup at South Loop. C The driver must yield the right-of-way to other vehicles when merging and when entering a highway from an alley. 0000001775 00000 n A. brake and downshift in a curve Open, latched Should the shut off valves on the rear of the first trailer be open or closed on a set of double trailers? Trailer Air Tanks And Shutoff Valves - TruckingTruth B. slightly open Those that do not have spring brakes have emergency brakes that work from the air stored in the trailer air tank. 0000006015 00000 n You open the emergency line shut-off valve at the rear of the last trailer and hear air escaping. Always unlock the pintle hook with the dolly still under the rear trailer. how much space should be between the upper and lower fifth wheel? You need to stop braking because it's necessary for you to speed up, When you are in a drive-wheel braking skid, the first thing to do is STOP BRAKING! 7.3 Inspecting Doubles and Triples = Additional Things to Check During a Walkaround Inspection. good speed management says you should, may have poor traction due to bouncing and wheel lock up. The driver will be required to complete this requirement in three eight hour shifts. 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: Good speed management says you should: You must drive through deep or flowing water. 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 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. Doubles and triples must be driven very smoothly to avoid rollover or jacknife.

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