8. Air escape from the open valve You are driving with double trailers and must use your brakes to avoid a crash. Converter dolly air tank drain valve: CLOSED Air lines supported and glad hands properly connected. 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 . Never pull any trailer without visually inspecting the fifth wheel locking bar True! If this lamp is illuminated and does not go out, Make sure trailer height is correct. Should the shut off valves on the rear of the first trailer be open or closed on a set of double trailers? safe speed would be 40 MPH. A turn of the glad hand attached to the hose will join and lock the couplers. 0000007487 00000 n 11 During normal operation the brakes of the double/triple trailer are controlled by: A converter dolly is still under the second trailer when you unlock the pintle hook. when does the drivers manual say you should disable the steering axle brakes? 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. In double and triple trailers, the trailer air supply control should pop or _________ when air pressure drops into the range of 20 to 45 psi. D. Make sure the spare tire is secured, if it has one. Which diagram shows the best way to turn? C 6. To do this without wheel chocks you should: Empty trucks: When parking your double or triple combination, you should look for a parking space Open Which of these are the correct positions for shut-off valves in doubles and triples? Did you know you can fill out one quick form here on TruckingTruth and apply to several companies at once for paid CDL training? Should the shut-off valves on the trailers be open or closed on a set of double trailers? Double and triple trailers increase not only the operators risk of safety, but also the other motorists around him. Either the front or the rear brakes will not work properly or fully. 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: How do you know if your converter dolly is equipped with antilock brakes? If spare tire is carried on converter gear (dolly), make sure it's secured. You should keep at least ____ seconds of space ahead of you. A. brake and downshift in a curve . If youre reading this, youre probably asking yourself, Should I Read More, One aspect of living as a truck driver is that you are constantly away from home and have to purchase all your meals on the road. When checking your air lines, they must be secure and? 1/2 to 3/4 of an inch You should be sure the converter dolly air tank drain valves are _______ & the pintle hook is __________. 0000008894 00000 n Trucks with trailers have a dangerous crack-the-whip effect. When you are pulling trailers, which of the following statements is true about steering? Hit the article to see the way to back up your trailer like a pro! A full trailer behind a truck Ideal for replacing a worn, leaky drain valve on a compressor. How can you test that air flows to all trailers? Pickup at South Loop. This has the same value as the %%TIME_ALLOWED%% Variable on the Final Screen. A. the total stopping distance of a truck is the distance it takes to stop once the brakes are put on at any speed 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 Closed, latched Select the answer that correctly completes each statement. B. slow to a safe speed before entering the curve, then accelerate slightly through it If you want to couple a second trailer to your combination vehicle, secure it by using: The crack-the-whip effect that troubles trucks with trailers is most likely to cause a tip over: You are driving on a slippery road during the day. High Road 2.0! Close the emergency line shut-off valve at the rear of the trailer. 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. Sketch the shape of the passage between sections 1 and 2. allow "much more space than is needed for ideal driving conditions". B. keep gentle pressure on the brakes while going through the water and for a short distance after coming out You are driving a 100-feet truck with double trailers at 50 mph. Stay up to date on truck driving industry news. 0000003998 00000 n What's a converter dolly? 1. and the converter dolly air tank drain valve should be _____. You will have greater length and more dead axles to pull with your drive axles than other drivers. Some vehicles have dead end or dummy couplers to which the hoses may be attached when they are not in use. C. the service brakes slowly move to the fully applied position, Some large trucks have converted or "spot" mirrors. 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. CDL Doubles and Triples Test Question and Answers 2023 [PDF]: Commercial Drivers License Doubles and Triples Endorsements Knowledge Test. What does the Commercial Driver Handbook say about how much space you should keep ahead of your truck? 0000001582 00000 n 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. Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? This is CDL Doubles and Triples Test 3in our original Classic Mode. Which of the following statements about off tracking is true? However, converter dollies and trailers built before 1975 are not required to have spring brakes. Usually need a glad hand converter What is a converter dolly? Hazardous materials must be placarded on all four sides of EACH Trailer. How do you know if your converter dolly is equipped with antilock brakes? kingpin, That there is grease between upper and lower fifth wheel. 0000005664 00000 n Only trailers designed to be pulled with another trailer behind it will have a shut off valve. C Open the emergency line shut-off valve at the rear of the last trailer. Before coupling a trailer, you should make sure it is at the right height using? Park on level ground, put chock on the tires, and charge the air tank. The road is dry and visibility is good. The air lines will rupture On double and triple combinations, you must make sure that which of these is secure? The road is dry and visibility is good. 0000002636 00000 n The front trailer in a set of double trailers is most likely to turn over due to the Crack-the-Whip effect. You MUST have air all the way to the back for all the brakes to work. 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. B. you should avoid traveling next to others whenever possible The converter dolly air tank drain valve on coupled double and triple trailers should be: A. open B. closed C. partially opened B When inspecting coupled doubles and triples, make sure the pintle hooks are: A. secured to the safety pins B. in the open position C. latched C Which of these is true? Be sure air-lines are supported and glad hands are properly connected. When coupling twin trailers, a converter dolly is. You have not finished your quiz. second trailer will be connected, The dolly will have a yellow lamp on the left side, The dolly will have a yellow lamp on the right side, The dolly will have a red lamp on the left side, The dolly will have a red lamp on the right side. Make sure to visually inspect the fifth wheel and that the locking mechanism is [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." It depends on the load Page 7-6 Commercial Driver's Manual/2.0 = Be sure air lines are supported and glad hands are properly connected. More driving knowledge, questions and answers, online practice tests for obtaining a drivers . A C The last trailer in a combination is most likely to turn over. For emergency braking you should: Use controlled or stab braking Converter dollies: Often do not have spring brakes The crack the whip effect that troubles trucks with trailers. 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. To do this without wheels chocks you should: Supply air to the trailer air system with the tractor and then disconnect the emergency line. A-dolly. The converter dolly air tank drain valve on coupled double/triple trailers should be: Closed. Should the pintle hook be latched or unlatched when backing a dolly under the second trailer? 1. B. open; latched A. open A Open, latched B Open, free C Closed, latched D Closed, free 28. The word part ferrit- means: The rear trailers shut-off valves should be open and the front 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. It is important to check the height of the trailer before connecting a converter dolly to a trailer. These dollies will have a yellow lamp on the left side of the dolly. Locking jaws closed on This will prevent water and dirt from getting into the coupler and the air lines. What is likely to happen? The trailer brakes will unlock 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; . 0000006015 00000 n The converter dolly is an auxiliary axle with a coupling device. 0000001775 00000 n how can you be sure you supplied air to a second trailer? D Pintle hook latched. You are driving with double trailers and must use your brakes to avoid a crash. c. iron The trailer height is right when: The trailer will be raised slightly when the converter dolly is backed under it. Simply click in your answer to each CDL practice test question. open, closed, closed: Term. 0000006383 00000 n You are doing a walk around inspection of a double or triple trailer rig. Which the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the trailer. Those that do not have spring brakes have emergency brakes that work from the air stored in the trailer air tank. None of the above, 2. A Unless you are draining the condensation out of the air tank, then the drain valve dress gifs. door. You are visually checking the coupling of a converter dolly to the rear trailer. Mar 2 - Mar 3. Make sure you do not get in a spot you cannot pull straight through. recouple. If you do, there is a problem. Which is most likely to tip over: The driver must yield the right-of-way to other vehicles when merging and when entering a highway from an alley. 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! B. you can almost always stop more quickly than you can turn HlTo xGf`{iIMh-x||?pbE':X4ZZZRbu7 uvi_RHUkVXBVu{^B3 4e/iw\]RE] YY7i)e V*h(++WQ-]Xm9c5yU6BS" 5HiL,[b)ee:t/ )%BVGpU7T\ZJD 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? Each trailer and converter dolly has one or more air tanks. To check if the converter dolly is securely coupled to the rear trailer you should: Pull gently against the pin of the second trailer. 0000001107 00000 n We are here to help. With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. If this activity does not load, try refreshing your browser. What happens when there is a major leak in the emergency air line? 0000004668 00000 n The total number of questions. There is no obligation whatsoever. A major leak in the emergency line will cause the tractor protection valve to close and the trailer emergency brakes to come on. For emergency braking you should: May have poor traction due to bouncing and wheels lockup. C How should you test the coupling? A converter dolly is a piece of equipment designed to allow commercial trucks, such as semi-trucks, to pull a trailer. B. pull gently against the pin of the second semitrailer Doubles and triples must be driven very smoothly to avoid rollover or jacknife. A dolly should be pulled out from a rear trailer using? Converter dolly air tank drain valve: CLOSED. 0000010783 00000 n We've all wondered if the adventure and challenges of life on the open road would suit us better than the ordinary day to day lives we've always known. you should not, when you turn with the tractor/triple trailer combination the wheels that offtrack(cheat) the most are. Safety fail-safe features of a tractor-trailer converter dolly. When you go to the rear of the last trailer, what should you do to complete this check? New! D Air Storage and Drain Tanks: Air storage tanks are used to hold compressed air. The rear trailers shut-off valves should be closed and the front open. All other trailer air functions use the emergency line. They are filled by the emergency (supply) line from the tractor. Seriously! When does the "driver's manual" advise disconnecting the steering axle brakes to help keep the rig straight? B. keep other traffic out of your side space 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. Ship to Store. B. johnson bar A dolly has lights, air tanks, air relays, air lines, air brakes, ABS, electrical connections, etc. 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. At TruckingTruth we'll help you decide if trucking is right for you and help you get your career off to a great start. 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. The Verge logo. 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. Connect Converter Dolly to Front Trailer Back first semitrailer into position in front of dolly tongue. If you are only pulling one trailer, make certain the valve is fully in the closed position or it will leak air out of the air system. If the fifth wheel on a coupling is too far forward, the tractor frame may hit? The coupling between a rear trailer and a dolly should have a space between the upper and lower fifth wheels of? Be more careful in adverse conditions. You should keep at least ___ seconds of space ahead of you. Blue is used for the service lines, and red for the emergency (supply) lines. 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. Email Updates When New Articles Are Posted. Which of the following must be connected when coupling tractor to trailer or trailer to trailer? The number and size of air tanks varies among vehicles. This has the same value as the %%SCORE%% Variable on the Final Screen. Any vehicle, regardless of size, designed to transport 16 or more persons, including the driver. They provide the air pressure used to operate trailer brakes. If the spring brakes do not release when you push the trailer air supply control, check the air line connections. The road is dry and the visibility is good. If your tanks have automatic drains, they will keep most moisture out, but you should still open the drains to make sure. Study section 6.2 if you can't answer all of these questions. To help avoid mistakes, colors are sometimes used. You shouldn't stop braking. A. opening the air tank petcock 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: All ABS equipped units a sudden movement with the steering wheel can result in a tipped over rear trailer, you wish to turn right from one two-lane, two-way street to another. The pintle hook should always be secure when the vehicle is in motion. 12, 3. You must stop, yield to traffic and pedestrians, and only proceed when safe. A. air escape from the open valve The pressure in the service line is controlled by the brake pedal and the trailer hand brake. If you leave this page, your progress will be lost. You are driving a 100 foot twin trailer combination at 50 mph. Once you have coupled your rear trailer, you should test the coupling by? A CDL is required to drive any of the following vehicles: A vehicle with two separate parts - the power unit (tractor) and the trailer. If loading fails, click here to try again. You must treat a flashing red signal as you would treat a STOP sign. Why is there still destructive interference? A. require shorter stopping distances than full ones For emergency braking you should: Open the emergency line shut-off valve at the rear of the last trailer. A. you can steer more quickly and safely if you hold the wheel with one hand Pull gently against the pin of the second trailer. should remain in the closed position. That there is no space between upper and lower fifth wheel. 0000001162 00000 n Why should you use chocks when parking a trailer without spring brakes? Pintle-eye of dolly in place in pintle hook of trailer (s). Nothing, the weight of the trailer will keep it in place, 10. Make sure pintle hook is latched. Like a trailer, a dolly equipped with ABS will have a yellow indicator light on the left side. You should be sure the converter dolly air tank drain valves are _____ and the pintle hook is ____. Dont hesitate to take advantage of our practice tests in each category specific to your needs. Therefor, if there is a major leak in your service line, you may not know it until you try to use the service brake. 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. 0000009577 00000 n Help your friends discover what it takes to become a successful truck driver. 0000003261 00000 n If you have traffic on both sides of your vehicle and something is blocking your lane, a move to the right still be best. Make sure you can hear air escaping with the valve closed. 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. 9 Questions You Must Ask, Decide if Truck Driving is The Correct Career Path, Do Not Sell or Share My Personal Information. These mirrors: B. are the easiest to stop since there is no shifting cargo Which of these statements about quick steering movements and doubles/triples is true? If spare tire is on converter gear (dolly), make sure it is secured. Doubles and triples must be driven very smoothly to avoid rollover or jackknife. For emergency braking you should: you want to hook your combination to a second trailer that has no spring brakes. 3. 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 Which of the following is true about loading cargo into double or triple trailers? Stop the vehicle by gearing down and sparingly The converter dolly air tank drain valve on coupled double and triple trailers should be: Closed. Open the shut-off valves at the rear of the last trailer and listen for air flow. All trademarks are property of their respective owners. You are driving a triple trailer and there is a loss of air pressure in the emergency line. Always test the trailer brakes before driving with the hand valve or by pulling the air supply (tractor protection valve) control. Trailer Air Tanks And Shutoff Valves - Page 50. B The rear trailer of a double Optional: Leave your email address if you would like a reply: When inspecting doubles or triples, in what position should the air shut-off valves be in? B Your tractor protection valve control should pop out, or go from normal to emergency position, when air pressure falls into what range? Their drawbars differentiate them. Air escape from the open valve In order to receive your Doubles and Triples endorsement, it is required that you pass the states official CDL written Knowledge exam. How can you be sure you supplied air to a second trailer? When does the "driver's manual" advise disconnecting the steering axle brakes to help A) one inch of space . When only pulling one trailer, be sure the shut-off valves are all in the fully closed position. Doubles and triples are more likely to turn over than other combination vehicles because of the "crack- the-whip" effect. A truckers workspace is a small moving office Read More. This has the same value as the %%TIME_USED%% Variable on the Final Screen. When driving a truck with more than one trailer, which trailer should be first behind the truck? The heaviest trailer You are driving a 100-feet truck with double trailers at 30 mph. Visually check to make sure that the lead trailer is slightly higher than the center of To test the tractor protection valve, charge the trailer air brake system, turn off the engine, and Join 50,000+ users around America to get your Commercial Driver License today! Allow more following distance. 0000005554 00000 n The road is dry and the visibility is good. 0000010306 00000 n [California Commercial Driver Handbook] The weight of a truck: Is a major factor affecting stopping distance. B. releasing the pintle hook This would be very dangerous. Air pressure is sent from the air tanks to the brakes by relay valves. D These valves permit closing the air lines off when another trailer is not being towed. to do this without wheel chocks you should: supply air to the trailer air system with the tractor and then disconnect the emergency line. fumoto drain valve. Pull gently against the pin of the second trailer. mTouch Quiz will automatically populate the fields below. You should keep at least ____ seconds of space ahead of you. A. for coupled doubles and triples, be sure that the pintle hook is in the open position rear brakes will not work properly. Your vehicle is so long that you must swing wide to make the turn. Slow to the safe speed before entering, then accelerate slightly through the curve. When checking the coupling system, make sure that the locking jaws are around the shank of the. A dolly is like a very short trailer, with a ring hitch on the front and a fifth wheel on top. You are doing a walk around inspection of a double or triple trailer rig. A. use a low gear 0000007508 00000 n D Light cords firmly in sockets on trailer. 1 What three methods can you use to secure a second trailer before coupling? 2. A good and safe driver will always look out for ______. axle will have spring brakes due to the weight of the unit. the fifth wheel, so trailer is raised slightly when dolly is pushed under it. When the road is dry Doubles and triples are more likely to overturn than other combination vehicles because of the whip cracking effect. Therefore, look far ahead so you can slow down or change lanes gradually when necessary. 4. 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. What should you check for when inspecting the converter dolly and the pintle hook? Go to Section 4: Other Topics This question is in Section 4: Other Topics of our CDL Test Guide. Please use the form below to contact our customer service or sales team. There are more critical parts to check when you have two or three trailers. With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. Doubles/triples flip flop over from quick steering moves more easily than many vehicles. The dolly tow bar may fly up, possibly causing injury, and making it very difficult to B The rear trailers shut off valves should be closed and the front open to allow air to the Go to the rear of second trailer and open the emergency line shut-of valve. Some large trucks have curved (convex or spot) mirrors. View More Details. What three methods can you use to secure a second trailer before coupling? Terms in this set (43) Converter dollies are used to connect: A tractor-trailer combination to another trailer.