the converter dolly air tank drain valve should bethe converter dolly air tank drain valve should be

Which is most likely to tip over: B. the emergency line valve open and release air You should keep at least ____ seconds of space ahead of you. You will not be tested on uncoupling twins unless you want to get a double/triple trailer endorsement on your license. When testing trailer service brakes, you should use? However there are some states that allow doubles that are each 48 feet in length. We are an independent company focused on providing valuable motor vehicle and permit practice test information. You shouldn't stop braking. Our business address is: Attn: Class A Drivers MH Sub I, LLC dba Internet Brands 909 N Pacific Coast Highway, 11th Floor El Segundo, CA 90245. Try our free CDL Doubles and Triples Test Question and Answers Quiz online. 0000006836 00000 n Safety chains secured to trailer (s). 4. Have little braking power because they are small All ABS equipped units If you do, there is a problem. 0000009577 00000 n Why should you not use the trailer hand valve while driving? You can find it here: High Road 2.0. Converter dollies: A full trailer behind a truck What should you check for when inspecting a converter dolly? Make sure you have large enough gaps before entering or crossing traffic. 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 are driving a 100ft truck eith double trailers at 50mph. For all brakes to work on a triple combination, you must have air supply? These trailers have no parking brake. C Therefore, it is very important for safety that you use wheel chocks when you park trailers without spring brakes. Pintle-eye of dolly in place in pintle hook of trailer (s). This has the same value as the %%WRONG_ANSWERS%% Variable on the Final Screen. When checking your air lines, they must be secure and? locked . While inspecting your converter dolly coupling, you should make sure there is _______ between the upper and lower fifth wheel. %PDF-1.2 % What should you check for when inspecting the converter dolly and the pintle hook? This is CDL Doubles and Triples Test 3in our original Classic Mode. When you go to the rear of the last trailer, what should you do to complete this check? good speed management says you should, may have poor traction due to bouncing and wheel lock up. some large trucks have curved (convex or spot) mirrors. True False True If you want to couple a second trailer to you combiantion vehicle, secure it by using the: Trailer emergency air brakes. Which of the following must be connected when coupling tractor to trailer or trailer to trailer? The braking systems of double and triple trailers are different than those of straight trucks because doubles and triples. The heaviest trailer and possible answers include: open, free or closed, latched or closed, free or open, latched from TruckersDouble & Triple Trailer (CDL) Endorsement. Hook dolly to front trailer. 0000003240 00000 n When connecting the glad hands, press the two seals together with the couplers at a 90-degree angle to each other. Which of the following statements about off tracking is true? 0000007487 00000 n Often do not have spring brakes You should avoid traveling next to others when possible. You are driving with double trailers and must use your brakes to avoid a crash. The total number of questions. There are two types of converter dollies. When you are pulling trailers, which of the following statements is true about steering? B. open; latched You are driving a 100 foot twin trailer combination at 50 mph. Make sure you can hear air escaping with the valve closed. you are doing a walkaround inspection of a double or triple trailer rig. They are filled by the emergency (supply) line from the tractor. To help avoid mistakes, colors are sometimes used. A dolly has lights, air tanks, air relays, air lines, air brakes, ABS, electrical connections, etc. True! High Road 2.0! Take special care when pulling two and three trailers. You should keep at least ____ seconds of space ahead of you. Connect Converter Dolly to Front Trailer Back first semitrailer into position in front of dolly tongue. Remember: The trailer air brakes are supplied with air using the emergency line (also called the supply line). the crack-whip effect that triubkes trucks with trailers is most likely to cause a tip over when. Question 3 Explanation: All of the above. View the full article to see how to set cruise control correctly! not have spring brakes. You are doing a walk around inspection of a double or triple trailer rig. The trailer is at the correct height when. Why should you use chocks when parking a trailer without spring brakes? Study section 6.2 if you can't answer all of these questions. Open the emergency line shut-off valve at the rear of the last trailer. True! This means. Your vehicle is so long that you must swing wide to make the turn. A You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. Mar 2 - Mar 3. The rear trailer of a double A Commercial Drivers License Overview, Trucking Terminology and Transportation Definitions. You can reset the test and retake it as needed. None of the above, 2. 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. 0000009556 00000 n C. engaging the tractor valve protection control, You must drive through deep or flowing water. What's a converter dolly? Slow to the safe speed before entering, then accelerate slightly through the curve. 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 keep at least _____ seconds of space ahead of you. Make sure to visually inspect the fifth wheel and that the locking mechanism is At TruckingTruth we'll help you decide if trucking is right for you and help you get your career off to a great start. Connect the Converter Dolly to the Rear Trailer: Test the coupling by pulling against the pin of the second semitrailer. C. fully raised, Which of these statements about speed management and braking is true? The pintle hook should always be secure when the vehicle is in motion. Contributor: Luke Nold (Experienced truck driver for 5+ years and published writer for Fleet Magazine). On the first trailer in a set of doubles? Hb```f``b`c``e@ (Q6_* With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. recouple. 0000006195 00000 n D What do you check when making a visual check of coupling? inspection of all equipment. 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. c. iron Go to the rear of the rig. A truckers workspace is a small moving office Read More. That there is some space between the upper and lower fifth wheel. Open the emergency line shut-off valve at the rear of the last trailer. A 360 degree area of awareness is These dollies will have a yellow lamp on the left side of the dolly Questions You Should Know For Doubles And Triples 1. B. use only the trailer brakes Page 7-6 Commercial Driver's Manual/2.0 = Be sure air lines are supported and glad hands are properly connected. door. A Safety fail-safe features of a tractor-trailer converter dolly. Some large trucks have curved (convex or spot) mirrors. 9 Which of the following will probably happen if you are driving a double rig and a set of trailer wheels goes into a skid? B. releasing the pintle hook If you crossed the air lines, you could drive away, but you would not have trailer brakes. There are more things that can go wrong, and doubles/triples are less stable than other commercial vehicles. Any trailer with a reduced ground clearance Which of these is the correct answer? 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. B. restore traction to the tires Park on level ground, put chock on the tires, and charge the air tank. A low air buzzer will go off indicating something is wrong and either the front or the Once you have coupled your rear trailer, you should test the coupling by? Go to Section 4: Other Topics This question is in Section 4: Other Topics of our CDL Test Guide. The road is dry and visibility is good. Doubles and triples are more likely to overturn than other combination vehicles because of the whip cracking effect. How can you be sure you supplied air to a second trailer? They provide the air pressure used to operate trailer brakes. When driving with more than one trailer, which trailer should be the first one behind the tractor? 5. The converter dolly air tank drain valve on coupled double/triple trailers should be: You are driving a 100-feet truck with double trailers at 50 mph. Should the pintle hook be latched or unlatched when backing a dolly under the second trailer? When turning a double or triple at an intersection, the turn often cannot be completed without swinging wide. Doubles and triples must be driven very smoothly to avoid rollover or jackknife. Time allowed (Requires timer add on). to re-capture it. 3. "Glad hands" are coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer. 10. If your tractor protection valve doesn't work properly, then if an air hose starts to leak what could happen? You wish to turn right from one two-lane, two-way street to another. Only trailers designed to be pulled with another trailer behind it will have a shut off valve. If your converter dolly has to be moved over a distance to bring it to your semitrailer, you should? Light cords firmly in sockets on trailer. mTouch Quiz will automatically populate the fields below. What should you check for when inspecting the converter dolly? The road is dry and the visibility is good. Explore now! Doubles and triples take up more space than other commercial vehicles. When you do this, you should hear: you are driving with double trailer and must use your brakes to avoid a crash. But the brakes will hold only as long as there is air pressure in the trailer air tank. 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 _____. 1/2 to 3/4 of an inch Open, free Converter dolly air tank drain valve: CLOSED. 0000001375 00000 n Like a trailer, a dolly equipped with ABS will have a yellow indicator light on the left side. Driving doubles/triples is also more dangerous in hot and cold weather driving, as well as on mountain roads. Therefore, look far ahead so you can slow down or change lanes gradually when necessary. B 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. _______ should be tested with the hand valve but controlled in normal operation with the foot pedal. Eventually, the air will leak away, and then there will be no brakes. 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. Slow to the safe speed before entering, then accelerate slightly through the curve. We'll help you make the right choices and prepare for a great start to your trucking career. The A-dolly has a single drawbar with a single, centered hitching point. speed and start spinning again, in turn stopping your skid, All the listed answers would be correct. The number and size of air tanks varies among vehicles. A dolly should be pulled out from a rear trailer using? You must steer gently when pulling trailers. you want to hook your combination to a second trailer that has no spring brakes. CDL License Requirements State By State. Remember however, that is just a suggestion. 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 . You should keep at least ___ seconds of space ahead of you. Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? King pin. D The dolly tow bar may fly up, possibly causing injury, and making it very difficult to When does the "driver's manual" advise disconnecting the steering axle brakes to help keep the rig straight? Either the front or the rear brakes will not work properly or fully. If there is a trailer 0000008187 00000 n Each trailer and converter dolly has one or more air tanks. For emergency braking you should: A) closed . The dolly tow bar may fly up, possibly causing injury and making it very difficult to re-couple. New! axle will have spring brakes due to the weight of the unit. True or False? [California Commercial Driver Handbook] The weight of a truck: Is a major factor affecting stopping distance. Doubles and triples must be driven very smoothly to avoid rollover or jackknife. the trailer height is right when: the trailer will be raised slightly when the converter dolly is backed under it. 0000008894 00000 n The service air line is only used to control the service brakes (when you press on the brake pedal or use the trailer hand-valve). What is a converter dolly? It is very important to keep the air supply clean. A vehicle transporting hazardous materials is required to display placards where? In order to receive your Doubles and Triples endorsement, it is required that you pass the states official CDL written Knowledge exam. What is a converter dolly? The number of correct answers. 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. A thorough pre-trip inspection should catch any major service line leaks before you begin your trip. Time used (Requires timer add on). Then, the air loss from the leak will lower the air tank pressure quickly. The front trailer in a set of double trailers is most likely to turn over due to the Crack-the-Whip effect. Did you know you can fill out one quick form here on TruckingTruth and apply to several companies at once for paid CDL training? The trailer brakes will unlock What do you check when making a visual check of coupling? 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. How can you test that air flows to all trailers? 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 A. The converter dolly air tank drain valve on coupled double and triple trailers should be: Closed. Their drawbars differentiate them. and the converter dolly air tank drain valve should be _____. unsafe slow down even further, or better yet, find a safe haven and park until the The tanks will hold enough air to allow the brakes to be used several times even if the compressor stops working. When doing a walkaround inspection of a double or triple trailer, the shut-off valves should be _______ at the rear(s) of the front trailer(s) and ________ at the rear of the last trailer. When does the "driver's manual" advise disconnecting the steering axle brakes to help What three methods can you use to secure a second trailer before coupling? Be sure pintle-eye of dolly is in place in pintle hook of trailer(s). 7. A Trailer Air Tanks And Shutoff Valves - Page 50. You open the emergency line shut-off valve at the rear of the last trailer and hear air escaping. Some areas of concern are discussed below. This would be very dangerous. Pull gently against them in a low gear to make sure the brakes work. Disconnect the glad-hand at the front of the first trailer and listen for air flow. A converter dolly is still under the second trailer when you unlock the pintle hook. The puzzle: At the far left edge, the plates are in contact, so the path length difference between rays 222 and 333 is zero. What is a converter dolly? It is important not to let water and oil build up in the air tanks. To uncouple the rear trailer in a set of doubles, the shut-off valve at the rear of the front trailer should be: Closed. They provide the air pressure used to operate trailer brakes. You are driving a triple trailer and there is a loss of air pressure in the emergency line. The last trailer in a combination is most likely to turn over. TestPermit.com provides free unofficial review materials for a variety of exams. 60607. Air pressure is sent from the air tanks to the brakes by relay valves. B When driving a truck with more than one trailer, which trailer should be first behind the truck? ), a 15 year truck driving veteran, in January 2007. open, closed, closed: Term. A. you can steer more quickly and safely if you hold the wheel with one hand None of the above, 5. C This has the same value as the %%SCORE%% Variable on the Final Screen. Air will not be available to release the trailer spring brakes (parking brakes). How To Use Cruise Control Effectively As A Truck Driver. The converter dolly air tank drain valve on coupled double/triple trailers should be: Closed. B C. use stab or controlled braking, Which of these is true? Please visit using a browser with javascript enabled. Related Question Question: What does this sign mean? Close the emergency line shut-off valve at the rear of the trailer. Which of these is most likely too occur? All rights reserved Site Map. Do converter dollies have spring brakes? Closed, free, 8. On the middle trailer of a set of triples? B To do this without wheel chocks you should: Empty trucks: When parking your double or triple combination, you should look for a parking space Pull gently against the pin of the second trailer. This has the same value as the %%PERCENTAGE%% Variable on the Final Screen. Which of these is most likely to occur? The couplers have a rubber seal that prevents air from escaping. Many scientists are concerned that the melting of Earth's sea ice will increase Earth's surface temperature. A) one inch of space . A. completely open A Older trailers do not have spring brakes. Any items you have not completed will be marked incorrect. weather passes. The lighter semitrailer should be in first position behind the tractor. If you're pulling more than one trailer, all valves should be open except the very last trailer, which should have all valves in the closed position. Leave the emergency line shut-off valve closed and open the service line valve. Open the emergency line shut-off valve at the rear of the last trailer. Slow to a safe speed before entering the curve, then coast through the curve. Calculate the net energy change in kilojoules per mole that takes place on formation of MgF2_22(s) from the elements: Heat of sublimation for Mg(s) = 147.7 kJ/mol Eea_{ea}ea for F(g) = -328 kJ>mol, Bond dissociation energy for F2_22(g) = 158 kJ>mol Ei1_{i1}i1 for Mg(g) = 737.7 kJ>mol, Electrostatic interactions in MgF2_22(s) = -2957 kJ/mol Ei2_{i2}i2 for Mg(g) = 1450.7 kJ/mol. Visually check to make sure that the rear trailer is slightly lower than the center of the D C. closed; unlatched, Which of these will result in the best control on a curve? D rear brakes will not work properly. When you uncouple twin trailers, the last step is to Converter dollies You want to hook your combination to a second trailer that has no spring brakes. kingpin, That there is grease between upper and lower fifth wheel. coupled to the rear of a tractor-trailer combination forming a double bottom rig, Careful of the wording! B. A. closed; latched during normal operation the brakes of the double/triple trailer are controlled by : which of these will result in the best control on curves? 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? 0000010306 00000 n At section 1, where the cross-sectional area is 0.02 m2m^{2}m2, the air is at 40.0 kPa (abs), 60C60^{\circ} \mathrm{C}60C, and M=2.0. 0000005554 00000 n Please use the form below to contact our customer service or sales team. None of the above, 4. Each trailer and converter dolly has one or more air tanks. which of these statements about quick steering movements and doubles/triples is true? To prevent trailers from rolling over, you must steer gently and go slowly around corners, on ramps, off ramps and curves. 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. 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. Antilock Braking Systems on Converter Dollies, Converter dollies built on or after March 1, 1998, are required to have antilock brakes. when driving a truck with more than one trailer, which trailer should be first behind the truck? 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. C. closed, You can release the dolly brakes by: With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. Be more careful in adverse conditions. 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. 0000008915 00000 n These dollies will have a yellow lamp on the left side of the dolly. Types of converter dollies. A driver of a vehicle with double or triple trailers will have greater length and more dead axles to pull, increasing the likelihood of a wreck. This has the same value as the %%TIME_USED%% Variable on the Final Screen. 0000002636 00000 n You want to lock your combination to a second trailer that has no spring brakes. front of the second trailer. You should be sure the converter dolly air tank . A CDL is required to drive any of the following vehicles: A vehicle with two separate parts - the power unit (tractor) and the trailer. Ensuring the safety of the public starts with a thorough Should the shut off valves on the rear of the first trailer be open or closed on a set of double trailers? The service brakes slowly move to the fully applied position 0000003998 00000 n At section 2 downstream, the speed is 519 m/s. Which f these will result in the best control on curves? 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. D. Make sure the spare tire is secured, if it has one. If the converter dolly is close to your semitrailer, you should wheel it into position? A. hand valve Lock pintle hook. In a certain electronic device, a three-stage amplifier is desired, whose overall voltage gain is 42 dB. If it goes low enough, the trailer emergency brakes will come on. If the fifth wheel on a coupling is too far forward, the tractor frame may hit?
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