The individual voltage gains of the first two stages are to be equal, while the gain of the third is to be one-fourth of each of the first two. This has the same value as the %%WRONG_ANSWERS%% Variable on the Final Screen. The pintle hook should always be secure when the vehicle is in motion. Therefore, look far ahead so you can slow down or change lanes gradually when necessary. 11 During normal operation the brakes of the double/triple trailer are controlled by: Be sure pintle-eye of dolly is in place in pintle hook of trailer(s). The trailer height is right when: The trailer will be raised slightly when the converter dolly is backed under it. Florida CDL Handbook | FL CDL Handbook Coupling & Uncoupling for 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. The emergency brakes come on whenever the air supply knob is pulled out or the trailer is disconnected. kingpin. When coupling, be sure to couple the proper glad hands together. Free CDL - Doubles and Triples Flashcards | Quizlet 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 Disconnect the glad-hand at the front of the first trailer and listen for air flow. You should be sure the converter dolly air tank drain valves are _____ and the pintle hook is ____. For emergency braking you should: which of these statements about emergency steering is true? The number and size of air tanks varies among vehicles. 0000010306 00000 n 0000004668 00000 n you should keep atleast __seconds of space ahead of you. 27. Air pressure is sent from the air tanks to the brakes by relay valves. Air escape from the open valve Locking jaws closed on A. completely open The Doubles and Triples written CDL Exam is required for your doubles and triples endorsement. B. releasing the pintle hook They are filled by the emergency (supply) line from the tractor. The converter dolly air tank drain valve on coupled double and triple trailers should be: When inspecting coupled doubles and triples, make sure the pintle hooks are: How can you be sure you supplied air to a second trailer? [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]. 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. HlTo xGf`{iIMh-x||?pbE':X4ZZZRbu7 uvi_RHUkVXBVu{^B3 4e/iw\]RE] YY7i)e V*h(++WQ-]Xm9c5yU6BS" 5HiL,[b)ee:t/ )%BVGpU7T\ZJD 0000008894 00000 n That there is no space between upper and lower fifth wheel. Locking jaws closed on You want to lock your combination to a second trailer that has no spring brakes. When you go to the rear of the last trailer, what should you do to complete this check? At TruckingTruth we'll help you decide if trucking is right for you and help you get your career off to a great start. Older trailers do not have spring brakes. D - Converter dolly air tank drain valve: CLOSED. Always test the trailer brakes before driving with the hand valve or by pulling the air supply (tractor protection valve) control. 2. 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. which of these statements about managing space to the sides is true? How To Use Cruise Control Effectively As A Truck Driver. But the brakes will hold only as long as there is air pressure in the trailer air tank. 0000010285 00000 n 2. _______ should be tested with the hand valve but controlled in normal operation with the foot pedal. Time allowed (Requires timer add on). Which of the following statements about off tracking is true? 0000010705 00000 n This will prevent water and dirt from getting into the coupler and the air lines. If the air supply in the trailer air tank has leaked away, there will be no emergency brakes, and the trailer wheels will turn freely. "Glad hands" are coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer. 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. locked . 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. A Open the emergency line shut-off valve at the rear of the last trailer. A truckers workspace is a small moving office Read More. recouple. The rear trailers shut-off valves should be closed and the front open. The emergency line valve open and release air D speed and start spinning again, in turn stopping your skid, All the listed answers would be correct. Doubles and triples take up more space than other commercial vehicles. Ideal for replacing a worn, leaky drain valve on a compressor. Any trailer with a reduced ground clearance Flashcards - Doubles Triples Test #3 - FreezingBlue Does a converter dolly have a separate air tank? - Wisdom-Advices You should keep at least ____ seconds of space ahead of you. 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 . Tractor-trailers are considered combination vehicles. 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. 21 0 obj << /Linearized 1 /O 23 /H [ 1162 213 ] /L 29759 /E 11109 /N 7 /T 29221 >> endobj xref 21 38 0000000016 00000 n mTouch Quiz will automatically populate the fields below. 0000003060 00000 n 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? The coupling between a rear trailer and a dolly should have a space between the upper and lower fifth wheels of? When uncoupling doubles or triples, what is important to know about unlocking the pintle hook? Doubles/Triples Endorsement Flashcards | Quizlet Hook dolly to front trailer. DOUBLE/TRIPLE CDL Flashcards | Chegg.com the trailer height is right when: the trailer will be raised slightly when the converter dolly is backed under it. The Verge logo. The rear trailer of a triple If loading fails, click here to try again. Amazon.com: Air Tank Drain Valve C and possible answers include: open, free or closed, latched or closed, free or open, latched from TruckersDouble & Triple Trailer (CDL) Endorsement. Which of these is NOT a good thing to do when driving on slippery roads? Otherwise, the dolly tow bar may fly up, possibly causing injury and making it very difficult to re-couple. Any trailer, 7. A dolly has lights, air tanks, air relays, air lines, air brakes, ABS, electrical connections, etc. The lighter trailer should be in the rear. If the converter dolly is close to your semitrailer, you should wheel it into position? When you are pulling trailers, which of the following statements is true about steering? With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. When connecting two trailers the converter dolly is connected to the rear trailer first. You will speak with recruiters today. You are doing a walkaround inspection of a double or triple trailer rig. When driving with more than one trailer, which trailer should be the first one behind the tractor? A. air escape from the open valve fifth wheel, so trailer is raised slightly when dolly is pushed under it. Stay up to date on truck driving industry news. What does the Commercial Driver Handbook say about how much space you should keep ahead of your truck? Closed, latched when driving a truck with more than one trailer, which trailer should be first behind the truck? The front trailer in a set of double trailers is most likely to turn over due to the Crack-the-Whip effect. We are an independent company focused on providing valuable motor vehicle and permit practice test information. Our normal business hours are Monday-Friday 8 a.m. to 5 p.m. (Pacific Time). Open, free The trailer is at the correct height when. your vehicle is so long that you must swing wide to make a turn. to do this without wheel chocks you should: supply air to the trailer air system with the tractor and then disconnect the emergency line. We have a new version of this program. 9 Questions You Must Ask, Decide if Truck Driving is The Correct Career Path, Do Not Sell or Share My Personal Information. The trailer brakes will unlock will have a lamp on the drivers side. 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 The crack the whip effect that troubles trucks with trailers. 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. 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. How do you check to make sure trailer height is correct before coupling? When uncoupling the converter dolly Why should you never unhook the 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? Often do not have spring brakes A CDL is required to drive any of the following vehicles: A vehicle with two separate parts - the power unit (tractor) and the trailer. C 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. There is no obligation whatsoever. A vehicle transporting hazardous materials is required to display placards where? A major leak in the emergency line will cause the tractor protection valve to close and the trailer emergency brakes to come on. Always unlock the pintle hook with the dolly still under the rear trailer. There are more things that can go wrong, and doubles/triples are less stable than other commercial vehicles. . 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. B. use only the trailer brakes 6. Converter dollies have spring brakes. There is a school zone ahead. Any vehicle required by federal regulations to be placarded while transporting hazardous materials. Doubles and triples must be driven very smoothly to avoid rollover or jacknife. Air will not be available to release the trailer spring brakes (parking brakes). Park on level ground, put chock on the tires, and charge the air tank. The total number of questions. C. closed; unlatched, Which of these will result in the best control on a curve? 60607. Therefore, it is very important for safety that you use wheel chocks when you park trailers without spring brakes. paramount to safe driving. D Have little braking power because they are small Only trailers designed to be pulled with another trailer behind it will have a shut off valve. 0000001107 00000 n Be sure air-lines are supported and glad hands are properly connected. Slow to a safe speed before entering the curve, then coast through the curve. A. opening the air tank petcock C. use stab or controlled braking, Which of these is true? Flashcards - Doubles Tripes Test #4 - FreezingBlue you are visually checking the coupling of a converter dolly to the rear trailer. 3. View the full article to see how to set cruise control correctly! Pull gently against the pin of the second trailer. should remain in the closed position. You wish to turn right from one two-lane, two-way street to another. When you do this, you should hear: The couplers have a rubber seal that prevents air from escaping. You must stop, yield to traffic and pedestrians, and only proceed when safe. How should the converter dolly air tank drain valve on coupled double 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. hand valve There is no obligation whatsoever. Trailer Air Tanks And Shutoff Valves - Page 50. What three methods can you use to secure a second trailer before coupling? CDL Doubles and Triples Test Question and Answers What should you check for when inspecting the converter dolly? Stop the vehicle by gearing down and sparingly 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 _____. The tanks will hold enough air to allow the brakes to be used several times even if the compressor stops working. A Commercial Drivers License Overview, Trucking Terminology and Transportation Definitions. 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. 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. B. slightly open Chock the tires, park on level ground and charge the trailer air tank if it does Why should you not use the trailer hand valve while driving? Like a trailer, a dolly equipped with ABS will have a yellow indicator light on the left side. They provide the air pressure used to operate trailer brakes. You should keep at least ____ seconds of space ahead of you. The pressure in the service line is controlled by the brake pedal and the trailer hand brake. Shut off valves are only used on trailers designed to be towed in conjunction with other trailers (doubles / triples). The driver will be required to complete this requirement in three eight hour shifts. 2023 PA Doubles - Triples CDL Practice Test 3 - CristCDL.com To do this without wheel chocks you should: Empty trucks: When parking your double or triple combination, you should look for a parking space 0000004689 00000 n 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 you do this, you should hear: you are driving with double trailer and must use your brakes to avoid a crash. You are driving a 100-feet truck with double trailers at 50 mph. The crack the whip effect will topple the rear trailer first. 0000007032 00000 n Make sure to visually inspect the fifth wheel and that the locking mechanism is When checking your air lines, they must be secure and? PDF Section 7: Doubles and Triples - CDL Study You open the emergency line shut-off valve at the rear of the last trailer and hear air escaping. CDL License Requirements State By State.