), a 15 year truck driving veteran, in January 2007. For emergency braking you should: On a triple combination, the shutoff valves at the rear off the middle trailer should be? Before you can supply air to the air tanks of a second trailer you need to. Which diagram shows the best way to turn? 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 _____. More driving knowledge, questions and answers, online practice tests for obtaining a drivers . If you are driving a 200-foot triple at 35 mph, what is the minimum amount of space (in seconds) that you should keep ahead of you? A Open, latched B Open, free C Closed, latched D Closed, free 28. 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. 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. c. iron 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. 0000005554 00000 n There is no obligation whatsoever. Air pressure is sent from the air tanks to the brakes by relay valves. You MUST have air all the way to the back for all the brakes to work. A good and safe driver will always look out for ______. The total number of questions. The road is dry and visibility is good. Converter dolly air tank drain valve: CLOSED. While it is general practice to make blue the service line, red the emergency line, and green the electrical line, these colors are not required by any laws or regulations. be coupled to the rear of a tractor-trailer combination forming a hexagon bottom rig, A coupling device of one or two axles and a fifth wheel by which a semitrailer can be [California Commercial Driver Handbook] The weight of a truck: Is a major factor affecting stopping distance. Shut off valves are only used on trailers designed to be towed in conjunction with other trailers (doubles / triples). 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. Closed, latched A converter dolly is a piece of equipment designed to allow commercial trucks, such as semi-trucks, to pull a trailer. 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? which of these is not a good thing to do when driving on slippery roads? Air pressure is sent from the air tanks to the brakes by relay valves. These mirrors: make things seem smaller & further away then they really are. Secure converter gear support in raised position. The rear trailer of a double Remember however, that is just a suggestion. Tips for Backing Up a Trailer Like a Pro Trucker. converting it into two trailers, A coupling device of three or four axles and a fifth wheel by which a semitrailer can 0000001582 00000 n Please wait while the activity loads. You should be sure the converter dolly air tank drain valves are _______ & the pintle hook is __________. to do this without wheel chocks you should: supply air to the trailer air system with the tractor and then disconnect the emergency line. What is one function of the tractor protection valve? Push the brake pedal as hard as you can and hold it there If you feel What is likely to happen? In the coupling system, the locking jaws should be fixed around? When driving a truck with more than one trailer, which trailer should be first behind the truck? on kingpin. 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? you should check the trailer height before connecting a converter dolly to a second or third trailer. A turn of the glad hand attached to the hose will join and lock the couplers. This is CDL Doubles and Triples Test 3in our original Classic Mode. 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. Make a sketch that explains this phenomenon in terms of a feedback loop . B 0000008187 00000 n Feel Free to add additional fields for the Quiz Taker to complete using the "Add Fields" options to the right. How many different ways of coupling and uncoupling trailer combinations are there? If there is Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? While inspecting your converter dolly coupling, you should make sure there is _______ between the upper and lower fifth wheel. Before coupling a trailer, you should make sure it is at the right height using? The pressure in the service line tells how much pressure the relay valves should send to the trailer brakes. C. closed, You can release the dolly brakes by: D You are driving with double trailers and must use your brakes to avoid a crash. A. for coupled doubles and triples, be sure that the pintle hook is in the open position allow "much more space than is needed for ideal driving conditions". Ensuring the safety of the public starts with a thorough Did you know you can fill out one quick form here on TruckingTruth and apply to several companies at once for paid CDL training? and ensuring it is secure. Then, the air loss from the leak will lower the air tank pressure quickly. What is the most common foundation brake found on heavy vehicles? You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. If the spring brakes do not release when you push the trailer air supply control, check the air line connections. The converter dolly air tank drain valve on coupled double/triple trailers should be: Closed. When uncoupling, you should never unlock the _______ with the dolly still under the rear trailer. "Glad hands" are coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer. Our normal business hours are Monday-Friday 8 a.m. to 5 p.m. (Pacific Time). You are driving a 100 ft twin trailer combination at 50 mph. door. - Converter dolly air tank drain valve: CLOSED. When connecting two trailers the converter dolly is connected to the rear trailer first. The converter dolly air tank drain valve on coupled double/triple trailers should be: Answer: Closed. A. fully lowered 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? [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." D Doubles and triples are extremely prone to control issues and must be 2 Like a trailer, a dolly equipped with ABS will have a yellow indicator light on the left side. You want to lock your combination to a second trailer that has no spring brakes. C. the service brakes slowly move to the fully applied position, Some large trucks have converted or "spot" mirrors. A 360 degree area of awareness is This would be very dangerous. The tanks will hold enough air to allow the brakes to be used several times even if the compressor stops working. inspection of all equipment. When does the "driver's manual" advise disconnecting the steering axle brakes to help 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! You are driving with double trailers and must use your brakes to avoid a crash. Join 50,000+ users around America to get your Commercial Driver License today! Each tank has a drain valve on it, and you should drain each tank every day. air throughout the system. Any trailer, 7. These mirrors: Make things seem smaller and further away than they really are. 0000001107 00000 n Slow to the safe speed before entering, then accelerate slightly through the curve. All ABS equipped units 0000006836 00000 n Dont hesitate to take advantage of our practice tests in each category specific to your needs. B. 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 . A. you can steer more quickly and safely if you hold the wheel with one hand You should be sure the converter dolly air tank drain . Safety fail-safe features of a tractor-trailer converter dolly. Hazardous materials must be placarded on all four sides of EACH Trailer. What three methods can you use to secure a second trailer before coupling? B Pull gently against the pin of the second trailer. 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. 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. Go to the rear of second trailer and open the emergency line shut-of valve. 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. 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. The trailer height is right when: The trailer will be raised slightly when the converter dolly is backed under it. Newer trailers have spring brakes just like trucks and truck tractors. C 2. In order to receive your Doubles and Triples endorsement, it is required that you pass the states official CDL written Knowledge exam. 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. paramount to safe driving. When you go to the rear of the last trailer, what should you do to complete this check? The shortest trailer If you do, the brakes may not work correctly. 0000003998 00000 n Safety chains should be secured to trailer(s). They are not only longer, but also need more space because they cannot be turned or stopped suddenly. If this activity does not load, try refreshing your browser. 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 The rear trailers shut-off valves should be open and the front closed. You can test that air is flowing to all trailers by opening? C. foot pedal, Which of these statements about managing space to the sides is true? kingpin. The front trailer in a set of double trailers is most likely to turn over due to the Crack-the-Whip effect. you are driving a 100ft truck eith double trailers at 50mph. For emergency braking you should: May have poor traction due to bouncing and wheels lockup. You open the emergency line shut-off valve at the rear of the last trailer and hear air escaping. 1. You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. 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: A The last trailer in a combination is most likely to turn over. S-cam brakes are the most common style brakes on large trucks today. Which of these is most likely to occur? utilize the brakes. All of the above, 6. To help avoid mistakes, colors are sometimes used. Should the converter dolly air-tank drain valve be open or closed on a double trailer combination? Air will not be available to release the trailer spring brakes (parking brakes). You are visually checking the coupling of a converter dolly to the rear trailer. Always test the trailer brakes before driving with the hand valve or by pulling the air supply (tractor protection valve) control. What three methods can you use to secure a second trailer before coupling? 0000001162 00000 n Which of these statements about the handling of doubles and triples is true? Time limit varies by state. Visually check to make sure that the lead trailer is slightly higher than the center of The dolly tow bar may fly up, possibly causing injury, and making it very difficult to B. keep other traffic out of your side space High Road 2.0! 0000003240 00000 n Often do not have spring brakes The dolly tow bar may fly up, possibly causing injury and making it very difficult to re-couple. You need to be aware of how parking lots are arranged in order to avoid a long and difficult escape. B. slightly raised None of the above, 4. A vehicle transporting hazardous materials is required to display placards where? Single axle converter dollies are the most common type of converter dolly used in the U.S. C-dolly The C-dolly has two separate couplings, side-by-side. TestPermit.com provides free unofficial review materials for a variety of exams. C Compressed air usually has some water and some compressor oil in it. Never unlock the pintle hook with the dolly still under the rear trailer. Go to the rear of the rig. However, converter dollies and trailers built before 1975 are not required to have spring brakes. It is important not to let water and oil build up in the air tanks. You should keep at least ___ seconds of space ahead of you. Which of the following must be connected when coupling tractor to trailer or trailer to trailer? On double and triple combinations, you must make sure that which of these is secure? In bad weather, slippery conditions and mountain driving, you must be especially careful if you drive double and triple bottoms. you should avoid traveling next to others when possible. They provide the air pressure used to operate trailer brakes. you are driving on a slippery road during the day. A. release the spring brakes and check for movement The dolly tow bar may flip up causing bodily injury and making it very difficult to When you're trying to correct a drive-wheel braking skid why should you stop braking? Good speed management says you should: You must drive through deep or flowing water. A truckers workspace is a small moving office Read More. 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? You should check the height of the trailer before connecting a converter dolly to a second or third trailer. Take this same test in our other testing modes How to Get a Hazardous Materials Endorsement, What is a CDL? Pickup at South Loop. These mirrors: That split second that you release the brakes will allow them to match the vehicles road 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. 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 If you crossed the air lines, you could drive away, but you would not have trailer brakes. What does the drivers manual say about how much space you should keep ahead of your truck? C doubles/triples flip flop over from quick steering movements more easily than many other vehicles. You are driving with double trailers and must use your brakes to avoid a crash. When driving a double or triple trailer, greater care must be given to. Converter dolly air tank drain valve: CLOSED Air lines supported and glad hands properly connected. Your vehicle is so long that you must swing wide to make the turn. A major leak in the emergency line will cause the tractor protection valve to close and the trailer emergency brakes to come on. How much space should be between the upper and lower fifth wheels? 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. You are doing a walkaround inspection of a double or triple trailer rig. Provides a snug fit to eliminate unwanted seepage of air or water. B. slow to a safe speed before entering the curve, then accelerate slightly through it What happens when there is a major leak in the emergency air line? 7. A-dolly. When connecting the glad hands, press the two seals together with the couplers at a 90-degree angle to each other. 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. It is important to check the height of the trailer before connecting a converter dolly to a trailer. Any vehicle required by federal regulations to be placarded while transporting hazardous materials. If the fifth wheel on a coupling is too far forward, the tractor frame may hit? The converter dolly air tank drain valve on coupled double and triple trailers should be: When inspecting coupled doubles and triples, make sure the pintle hooks are: How can you be sure you supplied air to a second trailer? Once that's complete, then its an easy push back and the _______ should be tested with the hand valve but controlled in normal operation with the foot pedal. A. the total stopping distance of a truck is the distance it takes to stop once the brakes are put on at any speed You can find it here: High Road 2.0. A. always keep your vehicle to the right side of your lane Each trailer and converter dolly has one or more air tanks. To check that the trailer emergency brakes are working properly, you should pull out the trailer air supply control and? A A dolly is like a very short trailer, with a ring hitch on the front and a fifth wheel on top. B. you need about four times as much stopping distance at 40 mph as at 20 mph For all brakes to work on a triple combination, you must have air supply? You are doing a walk around inspection of a double or triple trailer rig. You should NOT: during normal operation the brakes of the double/triple trailer are controlled by : which of these will result in the best control on curves? The trailer brakes will unlock you are doing a walkaround inspection of a double or triple trailer rig. How much space should be between the upper and lower fifth wheel? mTouch Quiz will automatically populate the fields below. Did you know you can fill out one quick form here on TruckingTruth and apply to several companies at once for paid CDL training? A converter dolly is still under the second trailer when you unlock the pintle hook. 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. 4. Slow to a safe speed before entering the curve, then coast through the curve. 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. Follow the procedures described later in this section. 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. It is very important to keep the air supply clean. If one air system is very low on pressure _______. 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 rear trailer does not have shut-off valves. should remain in the closed position. All rights reserved 2022 TestPermit.com, CDL Doubles and Triples Test Question and Answers, Divided Highway Sign: Meaning, Quiz Definition, Example, Shape, Location, Color, Narrow Bridge Sign: Meaning, Quiz Definition, Example, Shape, Location, Color, STOP Sign 2023 Meaning, Quiz Definition, Example, Shape, Location, Color, Crossbuck Sign: Meaning, Definition, Example, Shape, Location, Color, Georgia CDL Permit Practice Test 2023 Study Guide [PDF], Georgia Motorcycle Permit Test 2023 with Study Guide [PDF], Georgia Permit Test 2023 (DDS Practice Test UPDATED), Georgia ADAP Practice Test 2023 Questions Answers Online, Ohio CDL Permit Practice Test 2023 Study Guide [PDF], Ohio Motorcycle Permit Test 2023 Study Guide [PDF]. you are driving a set of doubles and a set of trailer wheels goes in a skid. On the middle trailer of a set of triples? 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. The couplers have a rubber seal that prevents air from escaping. To check if the converter dolly is securely coupled to the rear trailer you should: Pull gently against the pin of the second trailer. Tractor-trailers are considered combination vehicles. 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.
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