Should the shut-off valves on the rear of the last trailer be open or closed? When you're trying to correct a drive-wheel braking skid why should you stop braking? 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. You should be sure the converter dolly air tank . Doubles/triples flip flop over from quick steering moves more easily than many vehicles. The total number of questions. The pintle hook should always be secure when the vehicle is in motion. We are here to help. Converter dolly air tank drain valve: CLOSED Air lines supported and glad hands properly connected. When you're finished, check your score and results. When does the "driver's manual" advise disconnecting the steering axle brakes to help keep the rig straight? symptoms of a bad fuel tank selector switch. A. fully lowered The converter dolly is an auxiliary axle with a coupling device. The road is dry and visibility is good. Stay up to date on truck driving industry news. Delivering to. Check them all. To do this without wheel chocks you should: Empty trucks: When parking your double or triple combination, you should look for a parking space A Commercial Drivers License Overview, Trucking Terminology and Transportation Definitions. Ship to Store. Only a certified diesel mechanic can check this. 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. Air escape from the open valve B Which f these will result in the best control on curves? If you do, there is a problem. This will let the rear wheels roll again and keep the rear wheels from sliding. Make sure the converter dolly air tank drain valve is closed. 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. Always test the trailer brakes before driving with the hand valve or by pulling the air supply (tractor protection valve) control. C Join 50,000+ users around America to get your Commercial Driver License today! 0000004668 00000 n Which diagram shows the best way to turn? Seriously! Try our free CDL Doubles and Triples Test Question and Answers Quiz online. What three methods can you use to secure a second trailer before coupling? 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? 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: Dont hesitate to take advantage of our practice tests in each category specific to your needs. securely fastened. Which of the following statements about off tracking is true? Which of the following will occur? Pintle hook latched. 1 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. Should the converter dolly air-tank drain valve be open or closed on a double trailer combination? A dolly is like a very short trailer, with a ring hitch on the front and a fifth wheel on top. 12, 3. 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. 10. [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." Which is most likely to tip over: A. release the spring brakes and check for movement When the road is dry None recouple. When coupling, be sure to couple the proper glad hands together. [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]. to re-capture it. Once you are finished, click the button below. The service brakes slowly move to the fully applied position You may not notice a major leak in the service line until you try to put the brakes on. How can you be sure you supplied air to a second trailer? you are driving a set of doubles and a set of trailer wheels goes in a skid. 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. 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. Which is most likely to tip over: 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. inspection of all equipment. 9 What value of channel width must the design use? Safety chains should be secured to trailer(s). You should keep at least ____ seconds of space ahead of you. If you feel You should keep at least ____ seconds of space ahead of you. In bad weather, slippery conditions and mountain driving, you must be especially careful if you drive double and triple bottoms. Air flows steadily and isentropically through a passage. The couplers have a rubber seal that prevents air from escaping. There is more chance for skids and loss of traction. 2 These mirrors: 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. Doubles and triples must be driven very smoothly to avoid rollover or jacknife. The driver must yield the right-of-way to other vehicles when merging and when entering a highway from an alley. What should you check for when inspecting the converter dolly and the pintle hook? 0000008915 00000 n B. This will supply air to the emergency (supply) lines. B. you need about four times as much stopping distance at 40 mph as at 20 mph Ideal for replacing a worn, leaky drain valve on a compressor. The crack the whip effect that troubles trucks with trailers. Study section 6.2 if you can't answer all of these questions. Terms in this set (43) Converter dollies are used to connect: A tractor-trailer combination to another trailer. C. closed; unlatched, Which of these will result in the best control on a curve? Light cords firmly in sockets on trailer. The rear trailer does not have shut-off valves. Ensuring the safety of the public starts with a thorough inspection of all equipment. 60607. B. are the easiest to stop since there is no shifting cargo A-dolly. New! A 360 degree area of awareness is King pin. Use the dummy couplers when the air lines are not connected to a trailer. Converter dollies are connected to front trailers with a? you want to hook your combination to a second trailer that has no spring brakes. 0000007032 00000 n It is very important to keep the air supply clean. Any items you have not completed will be marked incorrect. Use the engine brake or speed retarder. 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. B. slightly open B 0000003998 00000 n [California Commercial Driver Handbook] The weight of a truck: Is a major factor affecting stopping distance. your vehicle is so long that you must swing wide to make a turn. D Make sure you do not get in a spot you cannot pull straight through. The rear trailers shut off valves should be closed and the front open to allow air to the Allow much more space than is needed for ideal driving condition. Open the emergency line shut-off valve at the rear of the last trailer. B. johnson bar C. the service brakes slowly move to the fully applied position, Some large trucks have converted or "spot" mirrors. Connect the Converter Dolly to the Rear Trailer: Test the coupling by pulling against the pin of the second semitrailer. C 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 For all brakes to work on a triple combination, you must have air supply? You are driving a triple trailer and there is a loss of air pressure in the emergency line. Make sure you have large enough gaps before entering or crossing traffic. These valves permit closing the air lines off when another trailer is not being towed. Did you know you can fill out one quick form here on TruckingTruth and apply to several companies at once for paid CDL training? Locking jaws closed on A A. open the shut-off valves at the rear of both trailers Connect Converter Dolly to Front Trailer Back first semitrailer into position in front of dolly tongue. When checking the fifth wheel, you should make sure that it has enough? Related Question Question: What does this sign mean? you are doing a walkaround inspection of a double or triple trailer rig. Also, this page requires javascript. It is important to check the height of the trailer before connecting a converter dolly to a trailer. 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. A. use light, steady pressure on the brake pedal When you do this, you should hear: the crack-whip effect that triubkes trucks with trailers is most likely to cause a tip over when. C. fully raised, Which of these statements about speed management and braking is true? 5. A. require shorter stopping distances than full ones A major leak in the emergency line will cause the tractor protection valve to close and the trailer emergency brakes to come on. Often do not have spring brakes Each tank has a drain valve on it, and you should drain each tank every day. Why should you use chocks when parking a trailer without spring brakes? The driver will be required to complete this requirement in three eight hour shifts. A converter dolly is If a converter dolly has spring brakes, you release the brakes by You have connected the converter dolly to the front semitrailer and then connected the rear semitrailer to the converter dolly. You should be sure the converter dolly air tank drain valves are _____ and the pintle hook is _____. C B. you can almost always stop more quickly than you can turn At section 2 downstream, the speed is 519 m/s. You are doing a walk around inspection of a double or triple trailer rig. Compressed air usually has some water and some compressor oil in it. How many different ways of coupling and uncoupling trailer combinations are there? You must steer gently when pulling trailers. B. do not need to be checked as often as flat mirrors because they show a larger area Slow to a safe speed before entering the curve, then coast through the curve. B. open; latched If there are no dummy couplers, the glad hands can sometimes be locked together (depending on the couplings). The application only takes one minute. Visually check to make sure that the rear trailer is slightly lower than the center of the During normal operation the brakes of the double/triple trailer are controlled by: You are driving at night and you must dim your headlights for traffic. Number of wrong answers. 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? If the converter dolly is close to your semitrailer, you should wheel it into position? Time used (Requires timer add on). Visually check to make sure that the lead trailer is slightly higher than the center of 27. If the fifth wheel on a coupling is too far forward, the tractor frame may hit? Antilock Braking Systems on Converter Dollies, Converter dollies built on or after March 1, 1998, are required to have antilock brakes. NPT thumbscrew style design enables easy installation. A. the total stopping distance of a truck is the distance it takes to stop once the brakes are put on at any speed When the road is slippery You have not finished your quiz. paramount to safe driving. and the converter dolly air tank drain valve should be _____. What will happen if there is a major leak in the service air line? 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 road is dry and visibility is good. How do you check to make sure the trailer height is correct before coupling? What does the drivers manual say about how much space you should keep ahead of your truck? A That split second that you release the brakes will allow them to match the vehicles road safe speed would be 40 MPH. 0000001775 00000 n Please use the form below to contact our customer service or sales team. Chock the tires, park on level ground and charge the trailer air tank if it does The braking systems of double and triple trailers are different than those of straight trucks because doubles and triples. You should be sure the converter dolly air tank drain . 11 During normal operation the brakes of the double/triple trailer are controlled by: Air will not be available to release the trailer spring brakes (parking brakes). Doubles and triples are more likely to overturn than other combination vehicles because of the whip cracking effect. Air escape from the open valve You are driving with double trailers and must use your brakes to avoid a crash. Speed for other vehicles is often too fast for a multi-combination unit! This has the same value as the %%SCORE%% Variable on the Final Screen. 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. slow to safe speed before entering, then accelerate slightly through the curve. 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. 9 Questions You Must Ask, Decide if Truck Driving is The Correct Career Path, Do Not Sell or Share My Personal Information. 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. When driving a double or triple trailer, greater care must be given to. When connecting the glad hands, press the two seals together with the couplers at a 90-degree angle to each other. Converter dollies have spring brakes. Use only the trailer brakes kingpin. 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. B Open, latched Blue is used for the service lines, and red for the emergency (supply) lines. When uncoupling a rear trailer, you should remove some weight from the dolly by? What three methods can you use to secure a second trailer before coupling? 1/4 in. C. foot pedal, Which of these statements about managing space to the sides is true? A. completely open 0000001162 00000 n Some vehicles have dead end or dummy couplers to which the hoses may be attached when they are not in use. A green traffic light allows the driver to go. D 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. when does the drivers manual say you should disable the steering axle brakes? 0000002636 00000 n Charge the system and pump the brakes with the window down. 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. The rear trailers shut-off valves should be closed and the front open. View the price and details of this FINSBURY PUMP SYSTEMS 400L (SINGLE STAGE) 5.5HP HONDA GX PETROL ENGINE (18M HOSE) FIRE WATER TANK | Mobile fire units. 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. The pressure in the service line tells how much pressure the relay valves should send to the trailer brakes. 3. The dolly tow bar may fly up, possibly causing injury and making it very difficult to re-couple. fifth wheel, so trailer is raised slightly when dolly is pushed under it. For emergency braking you should: which of these statements about emergency steering is true? axle will have spring brakes due to the weight of the unit. Learn more and apply here: The more heavily loaded semitrailer should be in first position behind the tractor. The emergency brakes come on whenever the air supply knob is pulled out or the trailer is disconnected. A dolly should be pulled out from a rear trailer using? C. if you have traffic on both sides of your vehicle and something is blocking your lane, a move to the right may still be best, To uncouple the rear trailer in a set of doubles, the shut-off valve at the rear of the front trailer should be: B. closed In the coupling system, the locking jaws should be fixed around? ), a 15 year truck driving veteran, in January 2007. When uncoupling doubles or triples, what is important to know about unlocking the pintle hook? Unless you are draining the condensation out of the air tank, then the drain valve You can reset the test and retake it as needed. You are driving a tractor with multiple trailers. Doubles and triples must be driven very smoothly to avoid rollover or jackknife. With the red knob pushed in on the tractor dash, the service line should have air in it. You are visually checking the coupling of a converter dolly to the rear trailer. 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. Should I Be A Truck Driver? What is a converter dolly? A. air escape from the open valve how can you be sure you supplied air to a second trailer? If you have traffic on both sides of your vehicle and something is blocking your lane, a move to the right still be best. you should keep atleast __seconds of space ahead of you. (done) Chp 23: Cash Flow + Working Capital, Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer. A. allow "much more space" than is needed for ideal driving conditions 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 _______.
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