Stay up to date on truck driving industry news. The pintle hook? Make sure to visually inspect the fifth wheel and that the locking mechanism is When driving a double or triple trailer, greater care must be given to. 2 Connect Converter Dolly to Front Trailer Back first semitrailer into position in front of dolly tongue. Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? A connection device of one axle used to disconnect a semitrailer combination vehicle Your tractor protection valve control should pop out, or go from normal to emergency position, when air pressure falls into what range? There is no obligation whatsoever. and possible answers include: open, free or closed, latched or closed, free or open, latched from TruckersDouble & Triple Trailer (CDL) Endorsement. 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. What is likely to happen? Page 1 - Doubles/Triples Test Study Guide for the CDL 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. If you do cross the air lines, supply air will be sent to the service line instead of going to charge the trailer air tanks. You open the emergency line shut-off valve at the rear of the last trailer and hear air escaping. Learn more and apply here: TruckingTruth was founded by Brett Aquila (that's me! With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. When entering a roundabout, a driver must yield the right-of-way to drivers already in the roundabout and obey all traffic signs. The emergency brakes come on whenever air pressure in the emergency line is lost. D Be more careful in adverse conditions. A major leak in the emergency line will cause the tractor protection valve to close and the trailer emergency brakes to come on. A good and safe driver will always look out for ______. fumoto drain valve. Follow the procedures described later in this section. weather passes. Only a certified diesel mechanic can check this. When driving with more than one trailer, which trailer should be the first one behind the tractor? Therefore, look far ahead so you can slow down or change lanes gradually when necessary. 0000005554 00000 n C The shut off valves prevent air from going any further. the road is dry & visibility is good. What three methods can you use to secure a second trailer before coupling? If this lamp is illuminated and does not go out, 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: You are driving a 100-feet truck with double trailers at 50 mph. However there are some states that allow doubles that are each 48 feet in length. How can you be sure you supplied air to a second trailer? When you do this, you should hear: Which of these statements about emergency steering is true? You are driving a 100 ft twin trailer combination at 50 mph. b. cell A. release the spring brakes and check for movement your vehicle is so long that you must swing wide to make a turn. "Glad hands" are coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer. Air escape from the open valve some large trucks have curved (convex or spot) mirrors. Flammable materials in the front trailer then it must have the placards on that 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. Converter dollies have spring brakes. On double and triple combinations, you must make sure that which of these is secure? DOUBLE/TRIPLE CDL Flashcards | Chegg.com Slow to the safe speed before entering, then accelerate slightly through the curve. 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. The road is dry and visibility is good. A. open the shut-off valves at the rear of both trailers Seriously! to do this without wheel chocks you should: supply air to the trailer air system with the tractor and then disconnect the emergency line. Which diagram shows the best way to turn? Take special care when pulling two and three trailers. Some large trucks have curved (convex or spot) mirrors. Which is most likely to tip over: P0420 code honda odyssey 2011 - pjigzp.wikifit.it You should hear air escaping, showing the entire system is charged. 0000003977 00000 n Check them all. All rights reserved Site Map. C D. Make sure the spare tire is secured, if it has one. You should avoid traveling next to others when possible. Slow to the safe speed before entering, then accelerate slightly through the curve. A 0000010285 00000 n Open, free on kingpin. What three methods can you use to secure a second trailer before coupling? Watch the wording of the question AND the answers A safe driver will look for all of the above. Take this same test in our other testing modes How to Get a Hazardous Materials Endorsement, What is a CDL? Please visit using a browser with javascript enabled. A bent or damaged kingpin on a coupling should be? They provide the air pressure used to operate trailer brakes. True False True If you want to couple a second trailer to you combiantion vehicle, secure it by using the: Trailer emergency air brakes. Doubles/triples flip flop over from quick steering moves more easily than many vehicles. Open, latched Use the dummy couplers when the air lines are not connected to a trailer. What is a converter dolly? A low air buzzer will go off indicating something is wrong and either the front or the Make sure the converter dolly air tank drain valve is closed. True or False? This has the same value as the %%TOTAL%% Variable on the Final Screen. You should be sure the converter dolly air tank drain . You are doing a walk around inspection of a double or triple trailer By clicking on "Sign Up", you agree to our Terms of Use and Privacy Policy. 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 . which of these statements about quick steering movements and doubles/triples is true? If it goes low enough, the trailer emergency brakes will come on. If your tanks have automatic drains, they will keep most moisture out, but you should still open the drains to make sure. Sometimes, metal tags are attached to the lines with the words service and emergency stamped on them. coupled to the rear of a tractor-trailer combination forming a double bottom rig, Careful of the wording! A Usually need a glad hand converter Wait for air pressure to reach normal, then push in the red trailer air supply knob. C. closed, You can release the dolly brakes by: High Road 2.0! You must stop, yield to traffic and pedestrians, and only proceed when safe. You are doing a walk around inspection of a double or triple trailer rig. Time used (Requires timer add on). You should hear air escaping, showing the entire system is charged. To check air flows to all trailers, you should let air pressure reach normal then? B what is likely to happen if the pintle hook is unlocked with the dolly still under the second trailer? 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. Park on level ground, put chock on the tires, and charge the air tank. 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. When you do this, you should hear: You are driving a 100 foot twin trailer combination at 50 mph. 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. What three methods can you use to secure a second trailer before coupling? This has the same value as the %%TIME_USED%% Variable on the Final Screen. The trailer is at the correct height when. New! They provide the air pressure used to operate trailer brakes. Each trailer and converter dolly has one or more air tanks. Be certain you are clear at the sides before changing lanes. Use the engine brake or speed retarder. B If one air system is very low on pressure _______. The dolly tow bar may flip up causing bodily injury and making it very difficult to The front trailer in a set of double trailers is most likely to turn over due to the Crack-the-Whip effect. dress gifs. Before you can supply air to the air tanks of a second trailer you need to. you are doing a walkaround inspection of a double or triple trailer rig. safe speed would be 40 MPH. That there is no space between upper and lower sixth wheel. Pintle hook latched. The pressure in the service line tells how much pressure the relay valves should send to the trailer brakes. D Have little braking power because they are small Simply click in your answer to each CDL practice test question. Never unlock the pintle hook with the dolly still under the rear trailer. They provide the air pressure used to operate trailer brakes. This has the same value as the %%SCORE%% Variable on the Final Screen. Also, this page requires javascript. B 0000006383 00000 n The total number of questions. The driver will be required to complete this requirement in three eight hour shifts. you are driving a 100ft truck eith double trailers at 50mph. The converter dolly air tank drain valve on coupled double/triple 3. S-cam brakes are the most common style brakes on large trucks today. What will happen if there is a major leak in the service air line? The last trailer in a combination is most likely to turn over. The lighter trailer should be in the rear. If there is a trailer You are driving a 100-feet truck with double trailers at 30 mph. inspection of all equipment. 0000009577 00000 n To do this without wheel chocks you should: Empty trucks: When parking your double or triple combination, you should look for a parking space Allow much more space than is needed for ideal driving condition. What should you check for when inspecting the converter dolly and the pintle hook? The road is dry, and visibility is good. 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 drain valves are _____ and the pintle hook is ____. Doubles and triples must be driven very smoothly to avoid rollover or jacknife. A. closed; latched You should NOT: 9 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. This will prevent water and dirt from getting into the coupler and the air lines. The heaviest trailer 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: In this order, the shutoff valves at the rear of front trailers, the rear of the last trailer and the converter dolly air tank drain valve should be? B. slow to a safe speed before entering the curve, then accelerate slightly through it A 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. If this activity does not load, try refreshing your browser. A. open [California Commercial Driver Handbook] The weight of a truck: Is a major factor affecting stopping distance. Which of the following will occur? B. keep gentle pressure on the brakes while going through the water and for a short distance after coming out How do you know if your converter dolly is equipped with antilock brakes? can and will get stuck on a raised railroad crossing. C If the converter dolly is close to your semitrailer, you should wheel it into position? Pull gently against the pin of the second trailer. Learn more and apply here: The more heavily loaded semitrailer should be in first position behind the tractor. A) closed . D Ensuring the safety of the public starts with a thorough Push the brake pedal as hard as you can and hold it there Delivering to. You are driving with double trailers and must use your brakes to avoid a crash. Do converter dollies have spring brakes? Doubles and Triples CDL Practice Test - Class A Drivers B. 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 when driving a truck with more than one trailer, which trailer should be first behind the truck? mTouch Quiz will automatically populate the fields below. allow "much more space than is needed for ideal driving conditions". You can reset the test and retake it as needed. Connect Converter Dolly to Rear Trailer Make sure trailer brakes are locked and/or wheels chocked. TestPermit.com is not affiliated, endorsed, or sponsored by state agencies or any motor vehicle and any other departments in the United States, Canada, UK. Double and Triples Part 1 Flashcards - flashcardmachine.com Their drawbars differentiate them. Open the shut-off valves at the rear of the last trailer and listen for air flow. Explore now! Inspecting Doubles And Triples | High Road Online CDL Training 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. B You can test that air is flowing to all trailers by opening? Either the front or the rear brakes will not work properly or fully. View More Details. Which of the following must be connected when coupling tractor to trailer or trailer to trailer? Be sure air-lines are supported and glad hands are properly connected. 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 ADVERTISEMENT ADVERTISEMENT Visually check to make sure that the rear trailer is slightly lower than the center of the the trailer height is right when: the trailer will be raised slightly when the converter dolly is backed under it. Why should you check for when inspecting the converter dolly? A. make things look smaller and farther away than they really are Which of the following will probably happen if you are driving a double rig and a set of trailer wheels goes into a skid? 0000001956 00000 n C. fully raised, Which of these statements about speed management and braking is true? When driving doubles or triples how should they be driven to avoid rollover or jackknifing: What value of channel width must the design use? 0000007032 00000 n 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? doubles/triples flip flop over from quick steering movements more easily than many other vehicles. Locking jaws open Page 7-6 Commercial Driver's Manual/2.0 = Be sure air lines are supported and glad hands are properly connected. Air escape from the open valve You are driving with double trailers and must use your brakes to avoid a crash. 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? How do you check to make sure the trailer height is correct before coupling? C. use stab or controlled braking, Which of these is true? How should you test the coupling? 3. B the fifth wheel, so trailer is raised slightly when dolly is pushed under it. Ideal for replacing a worn, leaky drain valve on a compressor. C. use controlled or stab braking, The best way to stop any skid is to: The road is dry and visibility is good. 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.
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