C The road is dry and visibility is good. If there is What does the drivers manual say about how much space you should keep ahead of your truck? The lightest trailer A dolly should be pulled out from a rear trailer using? 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 _____. You should avoid traveling next to others when possible. To check air flows to all trailers, you should let air pressure reach normal then? A. fully lowered NPT thumbscrew style design enables easy installation. A) one inch of space . Please wait while the activity loads. You will speak with recruiters today. It is important to check the height of the trailer before connecting a converter dolly to a trailer. If you leave this page, your progress will be lost. The Verge logo. The rear trailer of a triple Lock pintle hook. You will speak with recruiters today. When driving a truck with more than one trailer, which trailer should be first behind the truck? True! you are driving at night and you must dim your headlights for traffic. While inspecting your converter dolly coupling, you should make sure there is _____ between the upper and lower fifth wheel. You open the emergency line shut-off valve at the rear of the last trailer and hear air escaping. How much space should be between the upper and lower fifth wheel? B 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. All rights reserved 2022 TestPermit.com, CDL Doubles and Triples Test Question and Answers, Divided Highway Sign: Meaning, Quiz Definition, Example, Shape, Location, Color, Narrow Bridge Sign: Meaning, Quiz Definition, Example, Shape, Location, Color, STOP Sign 2023 Meaning, Quiz Definition, Example, Shape, Location, Color, Crossbuck Sign: Meaning, Definition, Example, Shape, Location, Color, Georgia CDL Permit Practice Test 2023 Study Guide [PDF], Georgia Motorcycle Permit Test 2023 with Study Guide [PDF], Georgia Permit Test 2023 (DDS Practice Test UPDATED), Georgia ADAP Practice Test 2023 Questions Answers Online, Ohio CDL Permit Practice Test 2023 Study Guide [PDF], Ohio Motorcycle Permit Test 2023 Study Guide [PDF]. Learn more and apply here: The more heavily loaded semitrailer should be in first position behind the tractor. B. pull gently against the pin of the second semitrailer You want to lock your combination to a second trailer that has no spring brakes. 0000005345 00000 n 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 are driving a 100ft truck eith double trailers at 50mph. [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]. The crack the whip effect will topple the rear trailer first. Because of this, which of the following vehicle parts is most likely to tip over? The final procedure when connecting a rear trailer is to? Air valves should be closed on all trailers, Air valves should be open on all trailers, Rear of front trailers: closed, rear of last trailer: open, Rear of front trailers: open, rear of last trailer: closed. When you go to the rear of the last trailer, what should you do to complete this check? 2. If you have traffic on both sides of your vehicle and something is blocking your lane, a move to the right still be best. None Ideal for replacing a worn, leaky drain valve on a compressor. 27. 0000003998 00000 n 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 does the drivers manual say you should disable the steering axle brakes? These dollies will have a yellow lamp on the left side of the dolly. Time allowed (Requires timer add on). Ensuring the safety of the public starts with a thorough Some large trucks have curved (convex or spot) mirrors. That there is some space between the upper and lower fifth wheel. They are filled by the emergency (supply) line from the tractor. a. blood A. for coupled doubles and triples, be sure that the pintle hook is in the open position Locking jaws closed on The number of correct answers. You are driving with more than one trailer. Which of these are the correct positions for shut-off valves in doubles and triples? What should you check for when inspecting a converter dolly? This means. Leave the emergency line shut-off valve closed and open the service line valve. The air lines will rupture Why should you use chocks when parking a trailer without spring brakes? 3. Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? and possible answers include: open, free or closed, latched or closed, free or open, latched from TruckersDouble & Triple Trailer (CDL) Endorsement. 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. you should keep atleast __seconds of space ahead of you. 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. Should the pintle hook be latched or unlatched when backing a dolly under the second trailer? 0000001107 00000 n 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. B The driver must yield the right-of-way to other vehicles when merging and when entering a highway from an alley. What happens if you cross the Emergency Air Line and the Service Air Line? What does the Driver's manual say about how much space you should keep ahead of your truck? 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. the trailer height is right when: the trailer will be raised slightly when the converter dolly is backed under it. . C. fully raised, Which of these statements about speed management and braking is true? 0000007487 00000 n 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. D To do this without wheel chocks you should: Empty trucks: When parking your double or triple combination, you should look for a parking space Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? Charge the system and pump the brakes with the window down. 0000006383 00000 n which of these statements about quick steering movements and doubles/triples is true? 0000009556 00000 n 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. The lighter trailer should be in the rear. the fifth wheel, so trailer is raised slightly when dolly is pushed under it. B. The Doubles and Triples written CDL Exam is required for your doubles and triples endorsement. You should keep at least ____ seconds of space ahead of you. This has the same value as the %%TIME_USED%% Variable on the Final Screen. Safety chains should be secured to trailer(s). Take this same test in our other testing modes How to Get a Hazardous Materials Endorsement, What is a CDL? The dolly tow bar may fly up, possibly causing injury, and making it very difficult to Which of the following will occur? You will not be tested on uncoupling twins unless you want to get a double/triple trailer endorsement on your license. 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: What should you check for when inspecting the converter dolly? A. you can steer more quickly and safely if you hold the wheel with one hand 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. Ship to Store. A. use light, steady pressure on the brake pedal 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. 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. To do this without wheel chocks you should: Empty trucks: When parking your double or triple combination, you should look for a parking space Which of these is most likely too occur? D Eventually, the air will leak away, and then there will be no brakes. B You must steer gently when pulling trailers. You should NOT: You are driving a set of doubles and a set of trailer wheels goes into a skid. What is the most common foundation brake found on heavy vehicles? The dolly tow bar may fly up The pressure in the service line tells how much pressure the relay valves should send to the trailer brakes. When driving doubles or triples how should they be driven to avoid rollover or jackknifing: 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. not have spring brakes. B Close the emergency line shut-off valve at the rear of the trailer. D These mirrors: make things seem smaller & further away then they really are. Should the shut-off valves on the trailers be open or closed on a set of double trailers? 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. A Doubles/triples flip flop over from quick steering moves more easily than many vehicles. Make sure the converter dolly air tank drain valve is closed. When you are pulling trailers, which of the following statements is true about steering? True False True If you want to couple a second trailer to you combiantion vehicle, secure it by using the: Trailer emergency air brakes. When you do this, you should hear: Which of these statements about emergency steering is true? 0000001582 00000 n You should be sure the converter dolly air tank . Open, latched The rear trailers shut off valves should be closed and the front open to allow air to the A. open 0000007032 00000 n A vehicle transporting hazardous materials is required to display placards where? The pintle hook should always be secure when the vehicle is in motion. C Doubles and triples must be driven very smoothly to avoid rollover or jackknife. You are driving with double trailers and must use your brakes to avoid a crash. If a converter dolly is still under the second trailer and you unlock the pintle hook, what will probably happen? In order to receive your Doubles and Triples endorsement, it is required that you pass the states official CDL written Knowledge exam. If you feel the trailer will be raised slightly when the converter dolly is backed under it the best way to keep brakes from getting too hot while going down long grades is to : go slow and use only light, steady pressure on the brakes you are driving a 100ft truck with double trailers at 30mph. After 15 years on the road I wanted to help people understand the trucking industry and everything that came with the career and lifestyle of an over the road trucker. Make a sketch that explains this phenomenon in terms of a feedback loop . When you're finished, check your score and results. This will let the rear wheels roll again and keep the rear wheels from sliding. What three methods can you use to secure a second trailer before coupling? Dont hesitate to take advantage of our practice tests in each category specific to your needs. the rig will continue moving in a straight line no matter how much the steering wheel is turned. Those that do not have spring brakes have emergency brakes that work from the air stored in the trailer air tank. re-couple, You can if you want to, it does not matter. A Older trailers do not have spring brakes. Do converter dollies have spring brakes? Do converter dollies have spring brakes? Use only the trailer brakes 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.
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