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

C. closed; unlatched, Which of these will result in the best control on a curve? Stay up to date on truck driving industry news. Follow the procedures described later in this section. A [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]. Each trailer and converter dolly has one or more air tanks. you are visually checking the coupling of a converter dolly to 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. You should check the height of the trailer before connecting a converter dolly to a second or third trailer. Ship to Store. 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 Which of these is most likely too occur? 2) the second test is to go out to the trailer to ensure that the parking brakes have indeed applied. C. closed, You can release the dolly brakes by: A. air escape from the open valve While inspecting your converter dolly coupling, you should make sure there is _______ between the upper and lower fifth wheel. on kingpin. The pressure in the service line tells how much pressure the relay valves should send to the trailer brakes. This has the same value as the %%TIME_USED%% Variable on the Final Screen. Shut-off valves (at rear of trailers, in service and emergency lines): When pulling doubles or triples, what is important to know about the order of the trailers? a. blood 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 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. Each trailer and converter dolly has one or more air tanks. Therefor, if there is a major leak in your service line, you may not know it until you try to use the service brake. When testing trailer service brakes, you should use? Seriously! Take special care when pulling two and three trailers. What happens if you cross the Emergency Air Line and the Service Air Line? When uncoupling doubles or triples, what is important to know about unlocking the pintle hook? 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. You should be sure the converter dolly air tank drain . Those that do not have spring brakes have emergency brakes that work from the air stored in the trailer air tank. Release Dolly breaks by opening the air tank petcock or if the dolly has a spring break, use the Dolly parking brake control . This has the same value as the %%TOTAL%% Variable on the Final Screen. 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. securely fastened. A. always keep your vehicle to the right side of your lane King pin. To help avoid mistakes, colors are sometimes used. The last trailer in a combination is most likely to turn over. Locking jaws closed on How To Use Cruise Control Effectively As A Truck Driver. Antilock Braking Systems on Converter Dollies, Converter dollies built on or after March 1, 1998, are required to have antilock brakes. The road is dry and visibility is good. CDL Doubles and Triples Test Question and Answers 2023 [PDF]: Commercial Drivers License Doubles and Triples Endorsements Knowledge Test. A. for coupled doubles and triples, be sure that the pintle hook is in the open position 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? rear brakes will not work properly. You should keep at least ____ seconds of space ahead of you. Park on level ground, put chock on the tires, and charge the air tank. 0000008166 00000 n 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 you want to hook your combination to a second trailer that has no spring brakes. C. the service brakes slowly move to the fully applied position, Some large trucks have converted or "spot" mirrors. You will not be tested on uncoupling twins unless you want to get a double/triple trailer endorsement on your license. What is one function of the tractor protection valve? C C When pulling a single trailer with a Shut-Off Valve, the valves must be in the: Trailers built before what year may not be equipped with trailer spring brakes? There are more things that can go wrong, and doubles/triples are less stable than other commercial vehicles. you should check the trailer height before connecting a converter dolly to a second or third trailer. Which of these is most likely to occur? B. you should avoid traveling next to others whenever possible Open, latched True! D. Make sure the spare tire is secured, if it has one. A. brake and downshift in a curve The number and size of air tanks varies among vehicles. The puzzle: At the far left edge, the plates are in contact, so the path length difference between rays 222 and 333 is zero. How can you test that air flows to all trailers? 0000009556 00000 n HlTo xGf`{iIMh-x||?pbE':X4ZZZRbu7 uvi_RHUkVXBVu{^B3 4e/iw\]RE] YY7i)e V*h(++WQ-]Xm9c5yU6BS" 5HiL,[b)ee:t/ )%BVGpU7T\ZJD In normal operation, trailer service brakes should be operated by? 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 should hear air escaping, showing the entire system is charged. You should NOT: You are driving a set of doubles and a set of trailer wheels goes into a skid. 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. 0000006015 00000 n Visually check to make sure that the lead trailer is slightly higher than the center of Make sure you do not get in a spot you cannot pull straight through. The lightest trailer Connect Converter Dolly to Rear Trailer Make sure trailer brakes are locked and/or wheels chocked. C. use stab or controlled braking, Which of these is true? What is most likely to happen if the trailer protection valve of a double or triple trailer does not function correctly? If you are driving a 200-foot triple at 35 mph, what is the minimum amount of space (in seconds) that you should keep ahead of you? - Converter dolly air tank drain valve: CLOSED. The rear trailers shut off valves should be closed and the front open to allow air to the Make sure you have large enough gaps before entering or crossing traffic. Should the shut off valves on the rear of the first trailer be open or closed on a set of double trailers? A Open, latched B Open, free C Closed, latched D Closed, free 28. Trucks with trailers have a dangerous crack-the-whip effect. 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? Remember: The trailer air brakes are supplied with air using the emergency line (also called the supply line). Hb```f``b`c``e@ (Q6_* Your tractor protection valve control should pop out, or go from normal to emergency position, when air pressure falls into what range? 3. The air lines will rupture What happens when there is a major leak in the emergency air line? If there is The trailer height is right when: The trailer will be raised slightly when the converter dolly is backed under it. Close the emergency line shut-off valve at the rear of the trailer. Clean the couplers and rubber seals before a connection is made. 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. your vehicle is so long that you must swing wide to make a turn. some large trucks have curved (convex or spot) mirrors. Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? B. do not need to be checked as often as flat mirrors because they show a larger area 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. 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. You should keep at least ___ seconds of space ahead of you. Air escape from the open valve You are driving with double trailers and must use your brakes to avoid a crash. A converter gear or dolly is a coupling device of one or two axles and a fifth wheel by which a semi-trailer can be coupled to the rear of a tractor-trailer combination forming a double bottom. 60607. front of the second trailer. Study section 6.2 if you can't answer all of these questions. What should you check for when inspecting the converter dolly? What should you check for when inspecting the converter dolly and the pintle hook? Before you can supply air to the air tanks of a second trailer you need to. This has the same value as the %%WRONG_ANSWERS%% Variable on the Final Screen. A thorough pre-trip inspection should catch any major service line leaks before you begin your trip. A 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. 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 _______. This has the same value as the %%PERCENTAGE%% Variable on the Final Screen. Question 3 Explanation: All of the above. The word part ferrit- means: The last trailer in a combination is most likely to turn over. Which of the following will probably happen if you are driving a double rig and a set of trailer wheels goes into a skid? You are doing a walk around inspection of a double or triple trailer rig. Slow to a safe speed before entering the curve, then coast through the curve. Shut off valves are only used on trailers designed to be towed in conjunction with other trailers (doubles / triples). Eventually, the air will leak away, and then there will be no brakes. How do you know if your converter dolly is equipped with antilock brakes? Disconnect the glad-hand at the front of the first trailer and listen for air flow. If there is a trailer 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. 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). When you do this, you should hear: Ais escape from the open valve. None of the above, 2. Make sure pintle hook is latched. Because of this, which of the following vehicle parts is most likely to tip over? The couplers have a rubber seal that prevents air from escaping. 0000002636 00000 n A dolly has lights, air tanks, air relays, air lines, air brakes, ABS, electrical connections, etc. There is more chance for skids and loss of traction. 4. Doubles and triples are more likely to overturn than other combination vehicles because of the whip cracking effect. That there is some space between the upper and lower fifth wheel. These mirrors: Make things seem smaller and further away than they really are. To check if the converter dolly is securely coupled to the rear trailer you should: Pull gently against the pin of the second trailer. 0000010705 00000 n ), a 15 year truck driving veteran, in January 2007. A dolly is like a very short trailer, with a ring hitch on the front and a fifth wheel on top. 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. It is important not to let water and oil build up in the air tanks. B 11 You are driving a triple trailer and there is a loss of air pressure in the emergency line. 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]. D The converter dolly air tank drain valve on coupled double and triple trailers should be: Closed. What is likely to happen? Types of converter dollies. Should the pintle hook be latched or unlatched when backing a dolly under the second trailer? A) closed . 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. More driving knowledge, questions and answers, online practice tests for obtaining a drivers . Locking jaws open Locking jaws closed on You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. Be certain you are clear at the sides before changing lanes. They provide the air pressure used to operate trailer brakes. Related Question Question: What does this sign mean? You can also reach us at (888) 830-2326. 0000008187 00000 n Doubles and triples are more likely to turn over than other combination vehicles because of the "crack-the-whip" effect. you should avoid traveling next to others when possible. What does the drivers manual say about how much space you should keep ahead of your truck? To check air flows to all trailers, you should let air pressure reach normal then? 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 _____. 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. and possible answers include: open, free or closed, latched or closed, free or open, latched from TruckersDouble & Triple Trailer (CDL) Endorsement. 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. For emergency braking you should: which of these statements about emergency steering is true? To test the tractor protection valve, charge the trailer air brake system, turn off the engine, and Explain why the waves that reflect from the far left edge of the plates in the given figure earlier exhibit destructive interference (zero intensity) at x=0x=0x=0. Be sure pintle-eye of dolly is in place in pintle hook of trailer(s). Usually need a glad hand converter A low air buzzer will go off indicating something is wrong and either the front or the A. allow "much more space" than is needed for ideal driving conditions When the road is dry 2. You need to be aware of how parking lots are arranged in order to avoid a long and difficult escape. 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 Remember, the service line is not used unless you depress the brake pedal or use the trailer hand valve. . Should the converter dolly air-tank drain valve be open or closed on a double trailer combination? A converter dolly is still under the second trailer when you unlock the pintle hook. When does the "driver's manual" advise disconnecting the steering axle brakes to help Time limit varies by state. To do this without wheel chocks you should: Empty trucks: When parking your double or triple combination, you should look for a parking space you are driving a 100ft truck eith double trailers at 50mph. A CDL is required to drive any of the following vehicles: A vehicle with two separate parts - the power unit (tractor) and the trailer. doubles/triples flip flop over from quick steering movements more easily than many other vehicles. 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