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By using this site, you agree to be bound by our Terms of Use, Privacy Policy and Cookie Policy, Copyright 2000-2023 MH Sub I, LLC dba Internet Brands. C. fully raised, Which of these statements about speed management and braking is true? Ideal for replacing a worn, leaky drain valve on a compressor. 7.3 Inspecting Doubles and Triples = Additional Things to Check During a Walkaround Inspection. When you go to the rear of the last trailer, what should you do to complete this check? These dollies will have a yellow lamp on the left side of the dolly Questions You Should Know For Doubles And Triples 1. Which of the following is true about loading cargo into double or triple trailers? 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. You need to brake in order to regain control. These mirrors: when driving a truck with more than one trailer, which trailer should be first behind the truck? The best way to keep brakes from getting to hot while going down long grades is to: Go slow and use only light, steady pressure on the brakes. 9. 0000007508 00000 n To check if the converter dolly is securely coupled to the rear trailer you should: Pull gently against the pin of the second trailer. You are driving a 100-feet truck with double trailers at 30 mph. If there are no dummy couplers, the glad hands can sometimes be locked together (depending on the couplings). You should reduce your speed by about _____ on a wet road. You are driving with double trailers and must use your brakes to avoid a crash. 3. The shut off valves, when in the open position, allows air to flow out to another trailer. you should avoid traveling next to others when possible. The A-dolly has a single drawbar with a single, centered hitching point. 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. There is no requirement or exact standard for color coding. Do converter dollies have spring brakes? Each tank has a drain valve on it, and you should drain each tank every day. What three methods can you use to secure a second trailer before coupling? 2. 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 dolly tow bar may fly up A. use the engine brake or speed retarder To test the tractor protection valve, charge the trailer air brake system, turn off the engine, and You can also reach us at (888) 830-2326. Visually check to make sure that the lead trailer is slightly higher than the center of Which f these will result in the best control on curves? You should avoid traveling next to others when possible. Use the engine brake or speed retarder. 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: When checking the coupling system, make sure that the locking jaws are around the shank of the. You should hear air escaping, showing the entire system is charged. and the converter dolly air tank drain valve should be _____. A CDL is required to drive any of the following vehicles: A vehicle with two separate parts - the power unit (tractor) and the trailer. They are filled by the emergency (supply) line from the tractor. True! 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. You will speak with recruiters today. You may be timed. 27. The emergency brakes come on whenever the air supply knob is pulled out or the trailer is disconnected. Park the rear trailer against another trailer, chock the tires and lock the trailer HlTo xGf`{iIMh-x||?pbE':X4ZZZRbu7 uvi_RHUkVXBVu{^B3 4e/iw\]RE] YY7i)e V*h(++WQ-]Xm9c5yU6BS" 5HiL,[b)ee:t/ )%BVGpU7T\ZJD allow "much more space than is needed for ideal driving conditions". How many different ways of coupling and uncoupling trailer combinations are there? Converter dolly air tank drain valve: CLOSED. Doubles and triples must be driven very smoothly to avoid rollover or jackknife. B You wish to turn right from one two-lane, two-way street to another. Which is most likely to tip over: 0000001162 00000 n Slow to the safe speed before entering, then accelerate slightly through the curve. kingpin. When uncoupling a rear trailer, your rig should be parked in a straight line on? We are here to help. With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. They provide the air pressure used to operate trailer brakes. Ship to Store. Allow much more space than is needed for ideal driving condition. which of these is not a good thing to do when driving on slippery roads? 1/3 For example: If you are traveling 60 MPH and it begins to rain, your suggested What is a converter dolly? For emergency braking you should: 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? Calculate the Mach number at section 2. A low air buzzer will go off indicating something is wrong and either the front or the C. use stab or controlled braking, Which of these is true? 6. if you have traffic on both sides of your vehicle and something is blocking your lane, a move to the right still be best. When does the Driver's manual say you should disable the steering axle brake? What value of channel width must the design use? Which of the following will probably happen if you are driving a double rig and a set of trailer wheels goes into a skid? 2. You should keep at least ____ seconds of space ahead of you. That there is no space between upper and lower fifth wheel. Always unlock the pintle hook with the dolly still under the rear trailer. Pull gently against them in a low gear to make sure the brakes work. retrovirus $_____________________________$. How To Use Cruise Control Effectively As A Truck Driver. Doubles and triples are more likely to turn over than other combination vehicles because of the "crack-the-whip" effect. how much space should be between the upper and lower fifth wheel? The emergency line valve open and release air 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. Feel Free to add additional fields for the Quiz Taker to complete using the "Add Fields" options to the right. Remember however, that is just a suggestion. Which of these is most likely to occur? 0000003060 00000 n B. johnson bar 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: B. the emergency line valve open and release air B. pull gently against the pin of the second semitrailer B. you should avoid traveling next to others whenever possible When coupling, be sure to couple the proper glad hands together. 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. Be more careful in adverse conditions. Lock pintle hook. Pintle hook latched. to re-capture it. There are two types of converter dollies. What three methods can you use to secure a second trailer before coupling? We'll help you make the right choices and prepare for a great start to your trucking career. Closed, free, 8. What is likely to happen? Make sure pintle hook is latched. What should you check for when inspecting the converter dolly and the pintle hook? The road is dry and the visibility is good. 0000010306 00000 n What is the most common foundation brake found on heavy vehicles? When connecting a converter dolly to a rear trailer, the trailer height must be adjusted so that it is? Any time you have to You can find it here: High Road 2.0. 0000008915 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? Locking jaws closed on The rear trailer of a triple Definition. Air flows steadily and isentropically through a passage. 7. 1 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. 0000010285 00000 n The last trailer in a combination is most likely to turn over. Time limit varies by state. You can reset the test and retake it as needed. Go to the rear of the rig. What is a converter dolly? Why is there still destructive interference? All other trailer air functions use the emergency line. For emergency braking you should: You are doing a walk around inspection of a double or triple trailer rig. Stop the vehicle by gearing down and sparingly None of the above, 5. Any trailer with a reduced ground clearance The emergency brakes come on whenever air pressure in the emergency line is lost. Good speed management says you should: You must drive through deep or flowing water. Time used (Requires timer add on). Ensuring the safety of the public starts with a thorough inspection of all equipment. Be sure air-lines are supported and glad hands are properly connected. Converter dolly air tank drain valve: CLOSED. A green traffic light allows the driver to go. These valves permit closing the air lines off when another trailer is not being towed. 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. The road is dry and visibility is good. B cQ 220rd8bihuM#Om>G*Lz)g^\l9'A9/omf|b49U[@%jGT-QR6i. B axle will have spring brakes due to the weight of the unit. A Make sure you can hear air escaping with the valve closed. 0000008187 00000 n which of these statements about the handling of doubles and triples is true ? Which of the following will occur? Doubles and triples are more likely to overturn than other combination vehicles because of the whip cracking effect. Connect Converter Dolly to Rear Trailer Make sure trailer brakes are locked and/or wheels chocked.