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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. behind the shut-off valve then they need to remain open. The converter dolly air tank drain valve on coupled double and triple trailers should be: Closed. Locking jaws closed on Each trailer and converter dolly has one or more air tanks. None When driving with more than one trailer, which trailer should be the first one behind the tractor? On a triple combination, the shutoff valves on the rear of the last trailer should be? You should be sure the converter dolly air tank drain valves are _______ and the pintle hook is _____. Unless you are draining the condensation out of the air tank, then the drain valve then there is a problem with the ABS system. Each trailer and converter dolly has one or more air tanks. Either the front or the rear brakes will not work properly or fully. A. allow "much more space" than is needed for ideal driving conditions Converter dolly air tank drain valve: CLOSED. Feel Free to add additional fields for the Quiz Taker to complete using the "Add Fields" options to the right. 0000001375 00000 n Which trailer should come first behind the tractor? The dolly tow bar may fly away, possibly causing panic, and making it very difficult A. Otherwise, the dolly tow bar may fly up, possibly causing injury and making it very difficult to re-couple. front of the second 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. 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. A Any vehicle required by federal regulations to be placarded while transporting hazardous materials. This will prevent water and dirt from getting into the coupler and the air lines. Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? Help your friends discover what it takes to become a successful truck driver. Clean the couplers and rubber seals before a connection is made. When you turn with the tractor/triple trailer combination the wheels that off-track (cheat) the most are: You should check trailer height before connecting a converter dolly to a second or third trailer. 0000001354 00000 n B. you need about four times as much stopping distance at 40 mph as at 20 mph Doubles and triples must be driven very smoothly to avoid rollover or jacknife. with the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the trailer. Pintle-eye of dolly in place in pintle hook of trailer (s). You are driving with double trailers and must use your brakes to avoid a crash. 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. With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. coupled to the rear of a tractor-trailer combination forming a double bottom rig, Careful of the wording! At section 2 downstream, the speed is 519 m/s. 0000007508 00000 n 0000010705 00000 n Which of these are the correct positions for shut-off valves in doubles and triples? Light cords firmly in sockets on trailer. The number of correct answers. The heaviest trailer At TruckingTruth we'll help you decide if trucking is right for you and help you get your career off to a great start. the converter dolly air tank drain valve on couple double/triple trailers should be: to check if the converter dolly is securely coupled to the rear trailer you should: pull gently against the pin of the second trailer. A To prevent trailers from rolling over, you must steer gently and go slowly around corners, on ramps, off ramps and curves. Simply click in your answer to each CDL practice test question. Stay up to date on truck driving industry news. CDL License Requirements State By State. speed and start spinning again, in turn stopping your skid, All the listed answers would be correct. 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 open, closed, closed: Term. 9 B. restore traction to the tires Which is most likely to tip over: When entering a roundabout, a driver must yield the right-of-way to drivers already in the roundabout and obey all traffic signs. Doubles and triples are more likely to turn over than other combination vehicles because of what effect? Which of these is most likely to occur? Do converter dollies have spring brakes? 0000003060 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. 0000005733 00000 n retrovirus $_____________________________$. Only trailers designed to be pulled with another trailer behind it will have a shut off valve. Which of the following statements about off tracking is true? D You should keep at least ___ seconds of space ahead of you. When connecting the glad hands, press the two seals together with the couplers at a 90-degree angle to each other. The lighter trailer should be in the rear. Trucks with trailers have a dangerous crack-the-whip effect. 0000001775 00000 n Always test the trailer brakes before driving with the hand valve or by pulling the air supply (tractor protection valve) control. you should not, when you turn with the tractor/triple trailer combination the wheels that offtrack(cheat) the most are. What is one function of the tractor protection valve? B The service brakes slowly move to the fully applied position Compressed air usually has some water and some compressor oil in it. 0000004668 00000 n On the first trailer in a set of doubles? 0000008187 00000 n Some large trucks have curved (convex or spot) mirrors. None of the above, 5. what is likely to happen if the pintle hook is unlocked with the dolly still under the second trailer? What three methods can you use to secure a second trailer before coupling? "Glad hands" are coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer. What happens if you cross the Emergency Air Line and the Service Air Line? A good and safe driver will always look out for ______. These dollies will have a yellow lamp on the left side of the dolly. What is the most common foundation brake found on heavy vehicles? You can find it here: High Road 2.0. 9. C. always keep your vehicle to the left side of your lane, When testing the coupling of double trailers, the landing gear of the rear trailer should be: Open The road is dry and visibility is good. Connect Converter Dolly to Rear Trailer Make sure trailer brakes are locked and/or wheels chocked. A D You are driving a 100 ft twin trailer combination at 50 mph. If the fifth wheel on a coupling is too far forward, the tractor frame may hit? How should you test the coupling? B. for doubles and triples, the fifth wheel should be all the way towards the tractor The road is dry and visibility is good. What value of channel width must the design use? Types of converter dollies. Good speed management says you should: You must drive through deep or flowing water. The Doubles and Triples written CDL Exam is required for your doubles and triples endorsement. _______ should be tested with the hand valve but controlled in normal operation with the foot pedal. C. back up slightly and make a visual check of the coupling, You are driving with double trailers and must use your brakes to avoid a crash. 2003-2023 Chegg Inc. All rights reserved. Remember, the service line is not used unless you depress the brake pedal or use the trailer hand valve. C You are driving a 100 foot twin trailer combination at 50 mph. A coupling device of one or two axles and a fifth wheel by which a semitrailer can be coupled to the rear of a tractor-trailer combination forming a double bottom rig Should the shut off valves on the rear of the first trailer be open or closed on a set of double trailers? 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. If you have traffic on both sides of your vehicle and something is blocking your lane, a move to the right still be best. The pintle hook should always be secure when the vehicle is in motion. 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. A. release the spring brakes and check for movement To help avoid mistakes, colors are sometimes used. you are visually checking the coupling of a converter dolly to the rear trailer. The application only takes one minute. Doubles and triples take up more space than other commercial vehicles. Our normal business hours are Monday-Friday 8 a.m. to 5 p.m. (Pacific Time). Double and triple trailers increase not only the operators risk of safety, but also the other motorists around him. The Verge logo. C Therefor, if there is a major leak in your service line, you may not know it until you try to use the service brake. To do this without wheel chocks you should: Empty trucks: When parking your double or triple combination, you should look for a parking space When turning a double or triple at an intersection, the turn often cannot be completed without swinging wide. Converter dollies are connected to front trailers with a? True False True If you want to couple a second trailer to you combiantion vehicle, secure it by using the: Trailer emergency air brakes. Once that's complete, then its an easy push back and the Many scientists are concerned that the melting of Earth's sea ice will increase Earth's surface temperature. 0000009556 00000 n 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. These mirrors: Make things seem smaller and further away than they really are. . They are not only longer, but also need more space because they cannot be turned or stopped suddenly. a. blood 12, 3. You should keep at least _____ seconds of space ahead of you: You are driving with double trailers and must use your brakes to avoid a crash. Studying and applying oneself is the only way to successfully learn the information you need to know to pass all testing required to obtain your CDL. These valves permit closing the air lines off when another trailer is not being towed. 9 Questions You Must Ask, Decide if Truck Driving is The Correct Career Path, Do Not Sell or Share My Personal Information. Slow to a safe speed before entering the curve, then coast through the curve. You are driving with double trailers and must use your brakes to avoid a crash. Any trailer, 7. allow "much more space than is needed for ideal driving conditions". B. closed The driver will be required to complete this requirement in three eight hour shifts. The front trailer in a set of double trailers is most likely to turn over due to the Crack-the-Whip effect. In an application in which vGS=vDS=Vsupply=1.8V,v_{G S}=v_{D S}=V_{\text { supply }}=1.8 \mathrm{V},vGS=vDS=Vsupply=1.8V, a drain current of 2 mA is required of a device of minimum length of 0.18m.0.18 \mu \mathrm{m}.0.18m. 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. On a triple combination, the shutoff valves at the rear off the middle trailer should be? Always unlock the pintle hook with the dolly still under the rear trailer. 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. 11 During normal operation the brakes of the double/triple trailer are controlled by: 0000005664 00000 n when does the drivers manual say you should disable the steering axle brakes? High Road 2.0! inspection of all equipment. Calculate the voltage gain of each. This will supply air to the emergency (supply) lines. Safety fail-safe features of a tractor-trailer converter dolly. Use the engine brake or speed retarder. C. closed; unlatched, Which of these will result in the best control on a curve? 0000008166 00000 n That there is no space between upper and lower sixth wheel. weather passes. A. completely open Open, latched %PDF-1.2 % Park the rear trailer against another trailer, chock the tires and lock the trailer These mirrors: make things seem smaller & further away then they really are. A Commercial Drivers License Overview, Trucking Terminology and Transportation Definitions. Calculate the Mach number at section 2. Question 4. The driver must yield the right-of-way to other vehicles when merging and when entering a highway from an alley. Closed, free, 8. A. open the shut-off valves at the rear of both trailers Any items you have not completed will be marked incorrect. True or False? Remember however, that is just a suggestion. A. fully lowered What does the Driver's manual say about how much space you should keep ahead of your truck? You have not finished your quiz. The rear trailer does not have shut-off valves. fumoto drain valve. The converter dolly air tank drain valve on coupled double/triple trailers should be: Closed. Older trailers do not have spring brakes. You are doing a walk around inspection of a double or triple trailer rig. Go to the rear of the rig. Safety should never take second place, so know your stuff! If there is a trailer the fifth wheel, so trailer is raised slightly when dolly is pushed under it. Because of this, which of the following vehicle parts is most likely to tip over? Did you know you can fill out one quick form here on TruckingTruth and apply to several companies at once for paid CDL training? Never pull any trailer without visually inspecting the fifth wheel locking bar There are two types of converter dollies. B. johnson bar 0000006836 00000 n You are doing a walkaround inspection of a double or triple trailer rig. Please wait while the activity loads. If there is air there, then there is air towards the cab You want to hook up to the first trailer, then the converter dolly while it is lined up in Doubles and triples are extremely prone to control issues and must be Speed for other vehicles is often too fast for a multi-combination unit! C How can you test that air flows to all trailers? When uncoupling doubles or triples, what is important to know about unlocking the pintle hook? The trailer is at the correct height when. 0000001162 00000 n 2 A truckers workspace is a small moving office Read More. A sudden movement with the steering wheel can result in a tipping over rear trailer. The emergency brakes come on whenever air pressure in the emergency line is lost. Be more careful in adverse conditions. 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. You must steer gently when pulling trailers. 60607. not have spring brakes. on kingpin. B For emergency braking you should: A dolly should be pulled out from a rear trailer using? B. You should reduce your speed by about _____ on a wet road. 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: The tanks will hold enough air to allow the brakes to be used several times even if the compressor stops working. 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. None of the above, 4. You should check the height of the trailer before connecting a converter dolly to a second or third trailer. should remain in the closed position. A Open, latched B Open, free C Closed, latched D Closed, free 28. symptoms of a bad fuel tank selector switch. 1 C. use controlled or stab braking, The best way to stop any skid is to: The road is dry, and visibility is good. When only pulling one trailer, be sure the shut-off valves are all in the fully closed position. What is a converter dolly? What will happen if there is a major leak in the service air line? B. you should avoid traveling next to others whenever possible How do you know if your converter dolly is equipped with antilock brakes? What do you check when making a visual check of coupling? 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. If there is A. for coupled doubles and triples, be sure that the pintle hook is in the open position These mirrors: When coupling twin trailers, a converter dolly is. Open. When you do this, you should hear: Becoming A Truck Driver is a dream we've all pondered at some point in our lives. D 4. What is likely to happen? c. iron D 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. Opening the shut off valves on the rear most trailer will ensure the lines are flowing C How To Use Cruise Control Effectively As A Truck Driver. What types of trailers can get stuck on raised crossings? The rear trailers shut-off valves should be open and the front closed. CDL Doubles and Triples Test Question and Answers 2023 [PDF]: Commercial Drivers License Doubles and Triples Endorsements Knowledge Test. Make sure you have large enough gaps before entering or crossing traffic. Describe what the trailer air supply control does. To uncouple the rear trailer in a set of doubles, the shut-off valve at the rear of the front trailer should be: Closed. Therefore, it is very important for safety that you use wheel chocks when you park trailers without spring brakes. 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 King pin. Release Dolly breaks by opening the air tank petcock or if the dolly has a spring break, use the Dolly parking brake control . Doubles and triples are more likely to overturn than other combination vehicles because of the whip cracking effect. you are driving at night and you must dim your headlights for traffic. 1. All ABS equipped units The crack the whip effect that troubles trucks with trailers. Make sure pintle hook is latched. 8. You should NOT: You are driving a set of doubles and a set of trailer wheels goes into a skid. What three methods can you use to secure a second trailer before coupling? A D "Glad hands" are coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer. A Why is there still destructive interference? 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. 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. B mTouch Quiz will automatically populate the fields below. The heavier trailer should be in the rear. Often do not have spring brakes [California Commercial Driver Handbook] The weight of a truck: Is a major factor affecting stopping distance. Each trailer and converter dolly has one or more air tanks. If you do, there is a problem. Doubles/triples flip flop over from quick steering moves more easily than many vehicles. the rig will continue moving in a straight line no matter how much the steering wheel is turned. Air flows steadily and isentropically through a passage. For all brakes to work on a triple combination, you must have air supply? New! 11 While inspecting your converter dolly coupling, you should make sure there is _______ between the upper and lower fifth wheel. Tips for Backing Up a Trailer Like a Pro Trucker. That split second that you release the brakes will allow them to match the vehicles road When you do this, you should hear: Ais escape from the open valve. 2) the second test is to go out to the trailer to ensure that the parking brakes have indeed applied. When coupling twin trailers, you should _______ the pintle hook and secure the dolly support in the _______ position. This has the same value as the %%TOTAL%% Variable on the Final Screen. You should not hear air escaping. Once you have coupled your rear trailer, you should test the coupling by? the road is dry & visibility is good. 0000006383 00000 n You can reset the test and retake it as needed. The rear trailer of a triple Provides a snug fit to eliminate unwanted seepage of air or water. You must treat a flashing red signal as you would treat a STOP sign. 0000001956 00000 n The road is dry and visibility is good. 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. 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. You want to lock your combination to a second trailer that has no spring brakes. [California Commercial Driver Handbook] The weight of a truck: Is a major factor affecting stopping distance. When does the "driver's manual" advise disconnecting the steering axle brakes to help keep the rig straight? In order to receive your Doubles and Triples endorsement, it is required that you pass the state's official CDL written Knowledge exam. Which of these is the correct answer? A. air escape from the open valve Delivering to. Should the pintle hook be latched or unlatched when backing a dolly under the second trailer? 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. 10 When checking the fifth wheel, you should make sure that it has enough? This has the same value as the %%TIME_ALLOWED%% Variable on the Final Screen. B. releasing the pintle hook 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 b. cell There is no obligation whatsoever. You will speak with recruiters today. Converter dolly air tank drain valve: CLOSED. 0000010285 00000 n Which the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the trailer. Should the shut off valves on the rear of the first trailer be open or closed on a set of double trailers? 0000002446 00000 n 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? If a converter dolly is still under the second trailer and you unlock the pintle hook, what will probably happen? 0000005554 00000 n ADVERTISEMENT ADVERTISEMENT Locking jaws closed on How do you check to make sure the trailer height is correct before coupling? The road is dry and the visibility is good. Be certain you are clear at the sides before changing lanes. B Secure converter gear support in raised position. A. countersteer Like a trailer, a dolly equipped with ABS will have a yellow indicator light on the left side. Study section 6.2 if you can't answer all of these questions. Mar 2 - Mar 3. Connect the Converter Dolly to the Rear Trailer: Test the coupling by pulling against the pin of the second semitrailer. If you crossed the air lines, you could drive away, but you would not have trailer brakes. when driving a truck with more than one trailer, which trailer should be first behind the truck? What does the drivers manual say about how much space you should keep ahead of your truck? The rear trailer of a double 0000004689 00000 n 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. Contributor: Luke Nold (Experienced truck driver for 5+ years and published writer for Fleet Magazine).