d. protein. When you go to the rear of the last trailer, what should you do to complete this check? The dolly tow bar may flip up causing bodily injury and making it very difficult to Some vehicles have dead end or dummy couplers to which the hoses may be attached when they are not in use. The crack the whip effect will topple the rear trailer first. You will have greater length and more dead axles to pull with your drive axles than other drivers. When you do this, you should hear: Ship to Store. In bad weather, slippery conditions and mountain driving, you must be especially careful if you drive double and triple bottoms. Only trailers designed to be pulled with another trailer behind it will have a shut off valve. doubles/triples flip flop over from quick steering movements more easily than many other vehicles. Trucks with trailers have a dangerous crack-the-whip effect. 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. How do you know if your converter dolly is equipped with antilock brakes? [California Commercial Driver Handbook] The weight of a truck: Is a major factor affecting stopping distance. A. fully lowered Use the dummy couplers when the air lines are not connected to a trailer. A 2) the second test is to go out to the trailer to ensure that the parking brakes have indeed applied. 0000007032 00000 n Terms in this set (43) Converter dollies are used to connect: A tractor-trailer combination to another trailer. Each trailer and converter dolly has one or more air tanks. you are driving a 100ft truck eith double trailers at 50mph. Pull gently against the pin of the second trailer. That there is some space between the upper and lower fifth wheel. D Describe what the trailer air supply control does. For emergency braking you should: A Push the brake pedal as hard as you can and hold it there B ADVERTISEMENT ADVERTISEMENT 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. Like a trailer, a dolly equipped with ABS will have a yellow indicator light on the left side. 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. 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? 2. Connect Converter Dolly to Front Trailer Back first semitrailer into position in front of dolly tongue. You should be sure the converter dolly air tank drain valves are _______ & the pintle hook is __________. Connect the Converter Dolly to the Rear Trailer: Test the coupling by pulling against the pin of the second semitrailer. The last trailer in a combination is most likely to turn over. A. hand valve Which of the following statements about off tracking is true? What types of trailers can get stuck on raised crossings? If the spring brakes do not release when you push the trailer air supply control, check the air line connections. Sometimes, metal tags are attached to the lines with the words service and emergency stamped on them. This has the same value as the %%PERCENTAGE%% Variable on the Final Screen. 0000006015 00000 n Pintle-eye of dolly in place in pintle hook of trailer (s). Please use the form below to contact our customer service or sales team. - Converter dolly air tank drain valve: CLOSED. which of these figures shows how the turn should be made, if you want to couple a second trailer to your combination vehicle, secure it by, the trailers spring brakes & wheel chocks. Safety should never take second place, so know your stuff! There is a school zone ahead. You should be sure the converter dolly air tank drain valves are _____ and the pintle hook is _____. B. you can almost always stop more quickly than you can turn The braking systems of double and triple trailers are different than those of straight trucks because doubles and triples. mTouch Quiz will automatically populate the fields below. PDF Section 7: Doubles and Triples - CDL Study The dolly tow bar may fly up, possibly causing injury and making it very difficult to re-couple. Make sure you can hear air escaping with the valve closed. door. (done) Chp 23: Cash Flow + Working Capital, Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer. How To Use Cruise Control Effectively As A Truck Driver. In a certain electronic device, a three-stage amplifier is desired, whose overall voltage gain is 42 dB. These mirrors: While inspecting your converter dolly coupling, you should make sure there is _______ between the upper and lower fifth wheel. To help avoid mistakes, colors are sometimes used. C. use controlled or stab braking, The best way to stop any skid is to: . the rig will continue moving in a straight line no matter how much the steering wheel is turned. Why should you not use the trailer hand valve while driving? None of the above, 5. All other trailer air functions use the emergency line. 0000010705 00000 n 8. Also available in App Store & Google Play. ), a 15 year truck driving veteran, in January 2007. A driver of a vehicle with double or triple trailers will have greater length and more dead axles to pull, increasing the likelihood of a wreck. In order to receive your Doubles and Triples endorsement, it is required that you pass the states official CDL written Knowledge exam. You will not be tested on uncoupling twins unless you want to get a double/triple trailer endorsement on your license. Take special care when pulling two and three trailers. You should keep at least ___ seconds of space ahead of you. weather passes. C. use stab or controlled braking, Which of these is true? 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. We are an independent company focused on providing valuable motor vehicle and permit practice test information. Push the brake pedal as hard as you can and hold it there Release Dolly breaks by opening the air tank petcock or if the dolly has a spring break, use the Dolly parking brake control . The tanks will hold enough air to allow the brakes to be used several times even if the compressor stops working. [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]. Closed, free, 8. You should hear air escaping, showing the entire system is charged. 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: Good speed management says you should: You must drive through deep or flowing water. You will speak with recruiters today. When connecting a converter dolly to a rear trailer, the trailer height must be adjusted so that it is? Do converter dollies have spring brakes? The emergency brakes come on whenever the air supply knob is pulled out or the trailer is disconnected. the crack-whip effect that triubkes trucks with trailers is most likely to cause a tip over when. 1/32 to 3/32 of an inch. Remember: The trailer air brakes are supplied with air using the emergency line (also called the supply line). some large trucks have curved (convex or spot) mirrors. 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What should you check for when inspecting the converter dolly and the pintle hook? What will happen if there is a major leak in the service air line? inspection of all equipment. A full trailer behind a truck Slow to a safe speed before entering the curve, then coast through the curve. You should avoid traveling next to others when possible. 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. There is no obligation whatsoever. Any vehicle required by federal regulations to be placarded while transporting hazardous materials. When you do this, you should hear: Ais escape from the open valve. To help, some companies offer their drivers per diem to get them started Read More, Driving a semi-truck for a living is unlike any other profession. Pintle hook latched. What three methods can you use to secure a second trailer before coupling? When does the "driver's manual" advise disconnecting the steering axle brakes to help Question 4. 0000002446 00000 n 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 11 During normal operation the brakes of the double/triple trailer are controlled by: 1/4 in. 0000003261 00000 n The trailer brakes will unlock Converter dolly air tank drain valve: CLOSED. Chock the tires, park on level ground and charge the trailer air tank if it does 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. Safety fail-safe features of a tractor-trailer converter dolly. D To uncouple the rear trailer in a set of doubles, the shut-off valve at the rear of the front trailer should be: Closed. The lightest trailer This is CDL Doubles and Triples Test 3in our original Classic Mode. When driving a truck with more than one trailer, which trailer should be first behind the truck? When coupling twin trailers, you should _______ the pintle hook and secure the dolly support in the _______ position. 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. A. open the shut-off valves at the rear of both trailers The shut off valves, when in the open position, allows air to flow out to another trailer. 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? Those that do not have spring brakes have emergency brakes that work from the air stored in the trailer air tank. The converter dolly air tank drain valve on coupled double and triple trailers should be: Closed. The heavier trailer should be in the rear. on kingpin. The road is dry and visibility is good. Follow the procedures described later in this section. The air lines will rupture Which is most likely to tip over: You should look into the back of the fifth wheel on a dolly to see if it is locked onto the kingpin, A safe speed on a curve for a straight truck or a single trailer combination vehicle may be too fast for double or triple trailers. Often do not have spring brakes you should check the trailer height before connecting a converter dolly to a second or third trailer. 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: Be sure air-lines are supported and glad hands are properly connected. 0000010783 00000 n axle will have spring brakes due to the weight of the unit. [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." and possible answers include: open, free or closed, latched or closed, free or open, latched from TruckersDouble & Triple Trailer (CDL) Endorsement. 2003-2023 Chegg Inc. All rights reserved. When you are pulling trailers, which of the following statements is true about steering? How can you be sure you supplied air to a second trailer? 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. 0000001107 00000 n Which of the following will probably happen if you are driving a double rig and a set of trailer wheels goes into a skid? B If you leave this page, your progress will be lost. 0000007508 00000 n C Dobles - Triples Pruebas de prctica 3 - NJ 2023 - CristCDL.com The trailer is at the correct height when. They are filled by the emergency (supply) line from the tractor. which of these statements about managing space to the sides is true? CDL Practice Tests 2023 - Doubles And Triples _______ should be tested with the hand valve but controlled in normal operation with the foot pedal. You are driving with double trailers and must use your brakes to avoid a crash. What does the drivers manual say about how much space you should keep ahead of your truck? If there are no dummy couplers, the glad hands can sometimes be locked together (depending on the couplings). The couplers have a rubber seal that prevents air from escaping. 12, 3. When checking the fifth wheel, you should make sure that it has enough? C. 3, You are doing a walk around inspection of a double or triple trailer rig. first check for battery voltage to the valve by probing the wires of the electrical connector with a volt-meter it should be about 10.5 volts if not it's probably bad.next remove the valve. you are driving a set of doubles and a set of trailer wheels goes in a skid. C. engaging the tractor valve protection control, You must drive through deep or flowing water. The dolly tow bar may fly up A Go to Section 4: Other Topics This question is in Section 4: Other Topics of our CDL Test Guide. You should NOT: What three methods can you use to secure a second trailer before coupling? Always test the trailer brakes before driving with the hand valve or by pulling the air supply (tractor protection valve) control. A thorough pre-trip inspection should catch any major service line leaks before you begin your trip. A When you uncouple twin trailers, the last step is to Converter dollies You want to hook your combination to a second trailer that has no spring brakes. Each trailer and converter dolly has one or more air tanks. Use controlled or stab braking B. do not need to be checked as often as flat mirrors because they show a larger area You should be sure the converter dolly air tank drain . Why should you check for when inspecting the converter dolly? 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. The Verge logo. b. cell symptoms of a bad fuel tank selector switch. When driving with more than one trailer, which trailer should be the first one behind the tractor? Open the emergency line shut-off valve at the rear of the last trailer. C. posted speed limits on curves are safe for all trucks, Empty trucks: 1. The road is dry, and visibility is good. 0000005664 00000 n The converter dolly air tank drain valve on coupled double/triple trailers should be: Answer: Closed. you should keep atleast __seconds of space ahead of you. Therefore, it is very important for safety that you use wheel chocks when you park trailers without spring brakes. Hb```f``b`c``e@ (Q6_* For emergency braking you should: Mar 2 - Mar 3. This has the same value as the %%TOTAL%% Variable on the Final Screen. The pressure in the service line is controlled by the brake pedal and the trailer hand brake. Which of these is most likely too occur? With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. C. use a light touch on the accelerator and brake pedals, For coupled double and triple trailers, all of the converter dolly shut-off valves should be: You must stop, yield to traffic and pedestrians, and only proceed when safe. when does the drivers manual say you should disable the steering axle brakes? When uncoupling doubles or triples, what is important to know about unlocking the pintle hook? Blue is used for the service lines, and red for the emergency (supply) lines. The lighter semitrailer should be in first position behind the tractor. You should hear air escaping, showing the entire system is charged. Safety chains secured to trailer (s). Which of these is the correct answer? C B. slightly open Check them all. your vehicle is so long that you must swing wide to make a turn. Each tank has a drain valve on it, and you should drain each tank every day. You should not hear air escaping. In order to supply air to the air tanks of a second trailer, you must ______ shut-off valves at the rear of the first trailer and ________ the shut-off valves at the rear of the second trailer. Dont hesitate to take advantage of our practice tests in each category specific to your needs. 0000009556 00000 n 0000006836 00000 n How do you check to make sure trailer height is correct before coupling? It is important to check the height of the trailer before connecting a converter dolly to a trailer. None C For all brakes to work on a triple combination, you must have air supply? 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. How should you test the coupling? locked . What is most likely to happen if the trailer protection valve of a double or triple trailer does not function correctly? Otherwise, the dolly tow bar may fly up, possibly causing injury and making it very difficult to re-couple. Driving doubles/triples is also more dangerous in hot and cold weather driving, as well as on mountain roads. To test the tractor protection valve, charge the trailer air brake system, turn off the engine, and 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. B. are the easiest to stop since there is no shifting cargo 0000006195 00000 n 2022 DE Doubles - Triples CDL Quick Review 1 - CristCDL.com A) closed . If you crossed the air lines, you could drive away, but you would not have trailer brakes. Therefor, if there is a major leak in your service line, you may not know it until you try to use the service brake. Once you are finished, click the button below. 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What three methods can you use to secure a second trailer before coupling? When uncoupling a rear trailer, your rig should be parked in a straight line on? Also, this page requires javascript. Their drawbars differentiate them. If the converter dolly is close to your semitrailer, you should wheel it into position? 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. Never pull any trailer without visually inspecting the fifth wheel locking bar Doubles and triples are more likely to turn over than other combination vehicles because of the "crack- the-whip" effect. then there is a problem with the ABS system. You must steer gently when pulling trailers. can and will get stuck on a raised railroad crossing. D True! You should be sure the converter dolly air tank . Learn more and apply here: TruckingTruth was founded by Brett Aquila (that's me! Park on level ground, put chock on the tires, and charge the air tank. rear brakes will not work properly. 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. To check air flows to all trailers, you should let air pressure reach normal then? Page 7-6 Commercial Driver's Manual/2.0 = Be sure air lines are supported and glad hands are properly connected. Provides a snug fit to eliminate unwanted seepage of air or water. When uncoupling, you should never unlock the _______ with the dolly still under the rear trailer. Doubles/Triples Endorsement Flashcards | Quizlet 0000009577 00000 n Be more careful in adverse conditions. cQ 220rd8bihuM#Om>G*Lz)g^\l9'A9/omf|b49U[@%jGT-QR6i. Ensuring the safety of the public starts with a thorough inspection of all equipment. All ABS equipped units A A. opening the air tank petcock It is important not to let water and oil build up in the air tanks. C Contributor: Luke Nold (Experienced truck driver for 5+ years and published writer for Fleet Magazine). Make sure to visually inspect the fifth wheel and that the locking mechanism is with the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the trailer. how much space should be between the upper and lower fifth wheel? 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. You have not finished your quiz. CDL Doubles and Triples Test Question and Answers 2023 [PDF]: Commercial Drivers License Doubles and Triples Endorsements Knowledge Test. 0000005733 00000 n CDL License Requirements State By State. You should NOT: You are driving a set of doubles and a set of trailer wheels goes into a skid. For emergency braking you should: Any combination of vehicles with a gross combined weight rating (GCWR) of 26,001 or more pounds, providing the gross vehicle weight rating (GVWR) of the vehicle being towed is in excess of 10,000 pounds. The rear trailer does not have shut-off valves. The converter dolly air tank drain valve on coupled double/triple