In normal operation, trailer service brakes should be operated by? A The number of correct answers. 10. 1/3 For example: If you are traveling 60 MPH and it begins to rain, your suggested the rig will continue moving in a straight line no matter how much the steering wheel is turned. We are here to help. 5. Why should you use chocks when parking a trailer without spring brakes? The road is dry, and visibility is good. 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: 9. You should hear air escaping, showing the entire system is charged. B You are driving a triple trailer and there is a loss of air pressure in the emergency line. You should keep at least ___ seconds of space ahead of you. Slow to the safe speed before entering, then accelerate slightly through the curve. Good speed management says you should: You must drive through deep or flowing water. Doubles and triples are more likely to turn over than other combination vehicles because of the "crack- the-whip" effect. [Penalties Applying to Any DUI Conviction; Driving Under the Influence of Drugs or Alcohol (The "DUI" Law); Section B-7 Alcohol, Other Drugs and Driving; Tennessee Comprehensive Driver License Manual]. The A-dolly has a single drawbar with a single, centered hitching point. How many different ways of coupling and uncoupling trailer combinations are there? which of these is not a good thing to do when driving on slippery roads? Trucks with trailers have a dangerous crack-the-whip effect. There is more chance for skids and loss of traction. When driving doubles or triples how should they be driven to avoid rollover or jackknifing: You must stop, yield to traffic and pedestrians, and only proceed when safe. All trademarks are property of their respective owners. If this activity does not load, try refreshing your browser. 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. A A dolly should be pulled out from a rear trailer using? Our normal business hours are Monday-Friday 8 a.m. to 5 p.m. (Pacific Time). How much space should be between the upper and lower fifth wheels? It depends on the load 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! 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. What is a converter dolly? The lighter trailer should be in the rear. B. you should avoid traveling next to others whenever possible 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. When you do this, you should hear: you are driving with double trailer and must use your brakes to avoid a crash. Release Dolly breaks by opening the air tank petcock or if the dolly has a spring break, use the Dolly parking brake control . They are not only longer, but also need more space because they cannot be turned or stopped suddenly. Mar 2 - Mar 3. Double and triple trailers increase not only the operators risk of safety, but also the other motorists around him. Open, free then there is a problem with the ABS system. You are driving with double trailers and must use your brakes to avoid a crash. D Also, this page requires javascript. 0000007487 00000 n B. use only the trailer brakes C Be sure air-lines are supported and glad hands are properly connected. C. fully raised, Which of these statements about speed management and braking is true? 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. There is no obligation whatsoever. View the full article to see how to set cruise control correctly! What three methods can you use to secure a second trailer before coupling? 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. C. use controlled or stab braking, The best way to stop any skid is to: recouple. For emergency braking you should: You are doing a walk around inspection of a double or triple trailer rig. 1/2 to 3/4 of an inch There are two types of converter dollies. Should the converter dolly air-tank drain valve be open or closed on a double trailer combination? A) one inch of space . Which of these statements about managing space to the sides is true? If it goes low enough, the trailer emergency brakes will come on. You are doing a walk around inspection of a double or triple trailer rig. Connect the Converter Dolly to the Rear Trailer: Test the coupling by pulling against the pin of the second semitrailer. You will have greater length and more dead axles to pull with your drive axles than other drivers. You should not hear air escaping. _______ should be tested with the hand valve but controlled in normal operation with the foot pedal. What should you check for when inspecting the converter dolly and the pintle hook? b. cell You should hear air escaping, showing the entire system is charged. When you're trying to correct a drive-wheel braking skid why should you stop braking? Air will not be available to release the trailer spring brakes (parking brakes). Either the front or the rear brakes will not work properly or fully. unsafe slow down even further, or better yet, find a safe haven and park until the B. you can almost always stop more quickly than you can turn Any single vehicle with a GVWR of 26,001 or more pounds, or any such vehicle towing another not in excess of 10,000 pounds. . You will speak with recruiters today. Open the emergency line shut-off valve at the rear of the last trailer. Ensuring the safety of the public starts with a thorough Follow the procedures described later in this section. What is one function of the tractor protection valve? C 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. 0000008894 00000 n A When pulling a single trailer with a Shut-Off Valve, the valves must be in the: Trailers built before what year may not be equipped with trailer spring brakes? front of the second trailer. 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. Speed for other vehicles is often too fast for a multi-combination unit! Time limit varies by state. You should NOT: The couplers have a rubber seal that prevents air from escaping. Why should you not use the trailer hand valve while driving? The dolly will have a yellow lamp on the drivers (left) side. Your vehicle is so long that you must swing wide to make the turn. When you do this, you should hear: rear trailer. B. johnson bar The driver must yield the right-of-way to other vehicles when merging and when entering a highway from an alley. While inspecting your converter dolly coupling, you should make sure there is _____ between the upper and lower fifth wheel. [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." A Open, latched B Open, free C Closed, latched D Closed, free 28. Select the answer that correctly completes each statement. You are driving with more than one trailer. 3. weather passes. Study section 6.2 if you can't answer all of these questions. None of the above, 2. 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. They provide the air pressure used to operate trailer brakes. When you go to the rear of the last trailer, what should you do to complete this check? When you are pulling trailers, which of the following statements is true about steering? You should reduce your speed by about _____ on a wet road. Which of these statements about quick steering movements and doubles/triples is true? When inspecting the air brakes on doubles and triples, you wait for air pressure to reach normal, then push in the red trailer air supply knob. Then, the air loss from the leak will lower the air tank pressure quickly. How can you test that air flows to all trailers? This has the same value as the %%WRONG_ANSWERS%% Variable on the Final Screen. The heavier trailer should be in the rear. A 0000007032 00000 n C open, closed, closed: Term. A. for coupled doubles and triples, be sure that the pintle hook is in the open position A B Air Storage and Drain Tanks: Air storage tanks are used to hold compressed air. 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. Any vehicle, regardless of size, designed to transport 16 or more persons, including the driver. 0000005554 00000 n Open coupled to the rear of a tractor-trailer combination forming a double bottom rig, Careful of the wording! Which of the following statements about off tracking is true? The trailer is at the correct height when. Which of these is most likely to occur? 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. 0000008166 00000 n For emergency braking you should: which of these statements about emergency steering is true? Disconnect the glad-hand at the front of the first trailer and listen for air flow. Question 3 Explanation: All of the above. How do you check to make sure trailer height is correct before coupling? Please visit using a browser with javascript enabled. 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. 0000010306 00000 n You should keep at least ____ seconds of space ahead of you. They are filled by the emergency (supply) line from the tractor. What does the Commercial Driver Handbook say about how much space you should keep ahead of your truck? 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. Which of the following is true about loading cargo into double or triple trailers? This has the same value as the %%TIME_USED%% Variable on the Final Screen. Never pull any trailer without visually inspecting the fifth wheel locking bar Go to the rear of second trailer and open the emergency line shut-of valve. At section 2 downstream, the speed is 519 m/s. You open the emergency line shut-off valve at the rear of the last trailer and hear air escaping. Driving doubles/triples is also more dangerous in hot and cold weather driving, as well as on mountain roads. To prevent trailers from rolling over, you must steer gently and go slowly around corners, on ramps, off ramps and curves. Otherwise, the dolly tow bar may fly up, possibly causing injury and making it very difficult to re-couple. All material on this website is copyrighted. 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. The puzzle: At the far left edge, the plates are in contact, so the path length difference between rays 222 and 333 is zero. Which f these will result in the best control on curves? Should I Be A Truck Driver? You are driving a 100 ft twin trailer combination at 50 mph. The trailer height is right when: The trailer will be raised slightly when the converter dolly is backed under it. Make sure you do not get in a spot you cannot pull straight through. D. Make sure the spare tire is secured, if it has one. View More Details. you should keep atleast __seconds of space ahead of you. 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. A. use the engine brake or speed retarder 0000003977 00000 n The service brakes slowly move to the fully applied position 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. Which the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the trailer. B. allow one vehicle length for every 10,000 lbs of gross vehicle weight C 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. Stop the vehicle by gearing down and sparingly Doubles/triples flip flop over from quick steering moves more easily than many vehicles. To do this without wheels chocks you should: Supply air to the trailer air system with the tractor and then disconnect the emergency line. 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 The road is dry and visibility is good. A) closed . If you have traffic on both sides of your vehicle and something is blocking your lane, a move to the right still be best. air throughout the system. utilize the brakes. Many scientists are concerned that the melting of Earth's sea ice will increase Earth's surface temperature. Chock the tires, park on level ground and charge the trailer air tank if it does 0000006195 00000 n 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: This has the same value as the %%TIME_ALLOWED%% Variable on the Final Screen. Please wait while the activity loads. Nothing, the weight of the trailer will keep it in place, 10. There are more critical parts to check when you have two or three trailers. B. open; latched Do converter dollies have spring brakes? 1. It is important to check the height of the trailer before connecting a converter dolly to a trailer. What's a converter dolly? Locking jaws closed on The emergency brakes come on whenever the air supply knob is pulled out or the trailer is disconnected. Page 7-6 Commercial Driver's Manual/2.0 = Be sure air lines are supported and glad hands are properly connected. 0000010285 00000 n Hit the article to see the way to back up your trailer like a pro! Make sure the converter dolly air tank drain valve is closed. not have spring brakes. behind the shut-off valve then they need to remain open. ADVERTISEMENT ADVERTISEMENT 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. you should check the trailer height before connecting a converter dolly to a second or third trailer. 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 Closed, free, 8. You are driving a 100-feet truck with double trailers at 50 mph. Any trailer, 7. A converter dolly is a piece of equipment designed to allow commercial trucks, such as semi-trucks, to pull a trailer. D B. for doubles and triples, the fifth wheel should be all the way towards the tractor Flammable materials in the front trailer then it must have the placards on that trailer. 0000003060 00000 n When uncoupling a rear trailer, you should remove some weight from the dolly by? On a triple combination, the shutoff valves on the rear of the last trailer should be? Doubles and triples take up more space than other commercial vehicles. When checking your air lines, they must be secure and? when driving a truck with more than one trailer, which trailer should be first behind the truck? How do you know if your converter dolly is equipped with antilock brakes? You must steer gently when pulling trailers. mTouch Quiz will automatically populate the fields below. The number and size of air tanks varies among vehicles. A. open the shut-off valves at the rear of both trailers Ideal for replacing a worn, leaky drain valve on a compressor. . "Glad hands" are coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer. A. CDL Doubles and Triples Test Question and Answers 2023 [PDF]: Commercial Drivers License Doubles and Triples Endorsements Knowledge Test. and the converter dolly air tank drain valve should be _____. Hazardous materials must be placarded on all four sides of EACH Trailer. A turn of the glad hand attached to the hose will join and lock the couplers. Simply click in your answer to each CDL practice test question. Doubles and triples are more likely to turn over than other combination vehicles because of what effect? A That there is no space between upper and lower sixth wheel. Which is most likely to tip over: What three methods can you use to secure a second trailer before coupling? Remember, the service line is not used unless you depress the brake pedal or use the trailer hand valve. How To Use Cruise Control Effectively As A Truck Driver. Antilock Braking Systems on Converter Dollies, Converter dollies built on or after March 1, 1998, are required to have antilock brakes. S-cam brakes are the most common style brakes on large trucks today. On double and triple combinations, you must make sure that which of these is secure? Because of this, which of the following vehicle parts is most likely to tip over? 0000001375 00000 n Only trailers designed to be pulled with another trailer behind it will have a shut off valve. The dolly tow bar may fly up, possibly causing injury, and making it very difficult to You are visually checking the coupling of a converter dolly to the rear trailer. Make sure to visually inspect the fifth wheel and that the locking mechanism is When does the Driver's manual say you should disable the steering axle brake? To check if the converter dolly is securely coupled to the rear trailer you should: Pull gently against the pin of the second trailer. doubles/triples flip flop over from quick steering movements more easily than many other vehicles. If a converter dolly is still under the second trailer and you unlock the pintle hook, what will probably happen? B 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 _____. When entering a roundabout, a driver must yield the right-of-way to drivers already in the roundabout and obey all traffic signs. 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 Their drawbars differentiate them. 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? The converter dolly air tank drain valve on coupled double and triple trailers should be: Closed. Always test the trailer brakes before driving with the hand valve or by pulling the air supply (tractor protection valve) control. Those that do not have spring brakes have emergency brakes that work from the air stored in the trailer air tank. Related Question Question: What does this sign mean? Time used (Requires timer add on). A. release the spring brakes and check for movement Remember: The trailer air brakes are supplied with air using the emergency line (also called the supply line). A dolly is like a very short trailer, with a ring hitch on the front and a fifth wheel on top. 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Pickup at South Loop. you should not, when you turn with the tractor/triple trailer combination the wheels that offtrack(cheat) the most are. Leave the emergency line shut-off valve closed and open the service line valve. A Each trailer and converter dolly has one or more air tanks. What does the Driver's manual say about how much space you should keep ahead of your truck? 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. 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. Often do not have spring brakes 0000009556 00000 n 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? The shut off valves prevent air from going any further. 3. 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. Converter dolly air tank drain valve: CLOSED. To test the tractor protection valve, charge the trailer air brake system, turn off the engine, and Go to Section 4: Other Topics This question is in Section 4: Other Topics of our CDL Test Guide. Use only the trailer brakes A-dolly. When connecting the glad hands, press the two seals together with the couplers at a 90-degree angle to each other. What three methods can you use to secure a second trailer before coupling? 11 A. use a low gear Park on level ground, put chock on the tires, and charge the air tank. you are driving on a slippery road during the day. What is a converter dolly? There is no obligation whatsoever. Join 50,000+ users around America to get your Commercial Driver License today! If loading fails, click here to try again. New! When the road is slippery TestPermit.com provides free unofficial review materials for a variety of exams. The dolly tow bar may fly up Tips for Backing Up a Trailer Like a Pro Trucker. When testing the coupling of the double trailer the landing gears of the rear trailer should be: You want to hook your combination to a second trailer that has no spring brakes. Which of these is NOT a good thing to do when driving on slippery roads? 0000002636 00000 n When you do this, you should hear: Pintle hook latched. you are doing a walkaround inspection of a double or triple trailer rig. Like a trailer, a dolly equipped with ABS will have a yellow indicator light on the left side. When driving with more than one trailer, which trailer should be the first one behind the tractor? What types of trailers can get stuck on raised crossings? Describe what the trailer air supply control does. Doubles and triples must be driven very smoothly to avoid rollover or jackknife. Some do. King pin. You can also reach us at (888) 830-2326. At TruckingTruth we'll help you decide if trucking is right for you and help you get your career off to a great start. The tanks will hold enough air to allow the brakes to be used several times even if the compressor stops working. A green traffic light allows the driver to go. True! Some vehicles have dead end or dummy couplers to which the hoses may be attached when they are not in use. If the dolly is a two axle unit then 1 When only pulling one trailer, be sure the shut-off valves are all in the fully closed position. To do this without wheel chocks you should: Empty trucks: When parking your double or triple combination, you should look for a parking space If spare tire is on converter gear (dolly), make sure it is secured. Safety chains secured to trailer (s). some large trucks have curved (convex or spot) mirrors. If you're pulling more than one trailer, all valves should be open except the very last trailer, which should have all valves in the closed position. More driving knowledge, questions and answers, online practice tests for obtaining a drivers . Converter dollies have spring brakes. A truckers workspace is a small moving office Read More. Slow to the safe speed before entering, then accelerate slightly through the curve. For emergency braking you should: A Push the brake pedal as hard as you can and hold it there B What is most likely to happen if the trailer protection valve of a double or triple trailer does not function correctly? It's a fifth wheel, not a sixth wheel. B. are the easiest to stop since there is no shifting cargo HlTo xGf`{iIMh-x||?pbE':X4ZZZRbu7 uvi_RHUkVXBVu{^B3 4e/iw\]RE] YY7i)e V*h(++WQ-]Xm9c5yU6BS" 5HiL,[b)ee:t/ )%BVGpU7T\ZJD A. always keep your vehicle to the right side of your lane What is likely to happen? B Blue is used for the service lines, and red for the emergency (supply) lines. 0000001162 00000 n Any time you have to 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. A. air escape from the open valve This means. 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? 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