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. The coupling between a rear trailer and a dolly should have a space between the upper and lower fifth wheels of? 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. Hit the article below to see specific information about AOBRDs! Why should you not use the trailer hand valve while driving? to re-capture it. You shouldn't stop braking. A To help, some companies offer their drivers per diem to get them started Read More, Driving a semi-truck for a living is unlike any other profession. Newer trailers have spring brakes just like trucks and truck tractors. The dolly tow bar may fly up, possibly causing injury, and making it very difficult to Provides a snug fit to eliminate unwanted seepage of air or water. You should be sure the converter dolly air tank drain valves are _____ and the pintle hook is _____. If one air system is very low on pressure _______. A. fully lowered NPT thumbscrew style design enables easy installation. Which is most likely to tip over: 7.3 Inspecting Doubles and Triples = Additional Things to Check During a Walkaround Inspection. You will have greater length and more dead axles to pull with your drive axles than other drivers. Once you are finished, click the button below. ), a 15 year truck driving veteran, in January 2007. Should I Be A Truck Driver? When entering a roundabout, a driver must yield the right-of-way to drivers already in the roundabout and obey all traffic signs. b. cell 0000003240 00000 n D 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. In order to supply air to the air tanks of a second trailer, you must ______ shut-off valves at the rear of the first trailer and ________ the shut-off valves at the rear of the second trailer. Use the engine brake or speed retarder. This has the same value as the %%TIME_ALLOWED%% Variable on the Final Screen. 3. Light cords firmly in sockets on trailer. 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 _____. Usually need a glad hand converter 6. with the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the trailer. securely fastened. Terms in this set (43) Converter dollies are used to connect: A tractor-trailer combination to another trailer. This has the same value as the %%TOTAL%% Variable on the Final Screen. 11 During normal operation the brakes of the double/triple trailer are controlled by: Because of this, which of the following vehicle parts is most likely to tip over? You are doing a walkaround inspection of a double or triple trailer rig. B you should keep atleast __seconds of space ahead of you. Only a certified diesel mechanic can check this. Time allowed (Requires timer add on). We have a new version of this program. Please use the form below to contact our customer service or sales team. your vehicle is so long that you must swing wide to make a turn. Converter dolly air tank drain valve: CLOSED. The converter dolly is an auxiliary axle with a coupling device. That split second that you release the brakes will allow them to match the vehicles road 0000008187 00000 n 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. When coupling twin trailers, a converter dolly is. Pickup at South Loop. Air flows steadily and isentropically through a passage. The road is dry and visibility is good. The Verge logo. Therefore, look far ahead so you can slow down or change lanes gradually when necessary. when does the drivers manual say you should disable the steering axle brakes? Slow to a safe speed before entering the curve, then coast through the curve. D 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. You should keep at least _____ seconds of space ahead of you. 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 are the correct positions for shut-off valves in doubles and triples? Calculate the Mach number at section 2. Then, the air loss from the leak will lower the air tank pressure quickly. Always test the trailer brakes before driving with the hand valve or by pulling the air supply (tractor protection valve) control. You are doing a walk around inspection of a double or triple trailer rig. 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. Air escape from the open valve B The service brakes slowly move to the fully applied position C The emergency line valve open and release air D None of the above 4. 9 Questions You Must Ask, Decide if Truck Driving is The Correct Career Path, Do Not Sell or Share My Personal Information. open, closed, closed: Term. How can you be sure you supplied air to a second trailer? Be certain you are clear at the sides before changing lanes. This has the same value as the %%SCORE%% Variable on the Final Screen. The driver will be required to complete this requirement in three eight hour shifts. B. do not need to be checked as often as flat mirrors because they show a larger area 5. 1/32 to 3/32 of an inch. coupled to the rear of a tractor-trailer combination forming a double bottom rig, Careful of the wording! Tractor-trailers are considered combination vehicles. There is no obligation whatsoever. Before you can supply air to the air tanks of a second trailer you need to. Learn more and apply here: TruckingTruth was founded by Brett Aquila (that's me! That there is some space between the upper and lower fifth wheel. If you have traffic on both sides of your vehicle and something is blocking your lane, a move to the right still be best. 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. Each tank has a drain valve on it, and you should drain each tank every day. converting it into two trailers, A coupling device of three or four axles and a fifth wheel by which a semitrailer can 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. How do you know if your converter dolly is equipped with antilock brakes? Remember, the service line is not used unless you depress the brake pedal or use the trailer hand valve. 1. %PDF-1.2 % C then there is a problem with the ABS system. You should be sure the converter dolly air tank drain . The rear trailers shut off valves should be closed and the front open to allow air to the How do you check to make sure trailer height is correct before coupling? If you do cross the air lines, supply air will be sent to the service line instead of going to charge the trailer air tanks. The shut off valves prevent air from going any further. A 360 degree area of awareness is This has the same value as the %%WRONG_ANSWERS%% Variable on the Final Screen. Connect Converter Dolly to Front Trailer Back first semitrailer into position in front of dolly tongue. "Glad hands" are coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer. They are filled by the emergency (supply) line from the tractor. A. closed; latched A connection device of one axle used to disconnect a semitrailer combination vehicle Delivering to. 3. Which f these will result in the best control on curves? A. use light, steady pressure on the brake pedal You wish to turn right from one two-lane, two-way street to another. Safety chains should be secured to trailer(s). recouple. Eventually, the air will leak away, and then there will be no brakes. which of these statements about managing space to the sides is true? What is most likely to happen if the trailer protection valve of a double or triple trailer does not function correctly? You should be sure the converter dolly air tank drain valves are _______ & the pintle hook is __________. air throughout the system. 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. 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. Doubles/triples flip flop over from quick steering moves more easily than many vehicles. The word part ferrit- means: Either the front or the rear brakes will not work properly or fully. You should avoid traveling next to others when possible. A. use the engine brake or speed retarder In order to receive your Doubles and Triples endorsement, it is required that you pass the states official CDL written Knowledge exam. 3. But the brakes will hold only as long as there is air pressure in the trailer air tank. Our normal business hours are Monday-Friday 8 a.m. to 5 p.m. (Pacific Time). 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. Email Updates When New Articles Are Posted. The converter dolly air tank drain valve on coupled double/triple trailers should be: Closed. You can find it here: High Road 2.0. A. A B C. closed; unlatched, Which of these will result in the best control on a curve? Air escape from the open valve You must treat a flashing red signal as you would treat a STOP sign. Blue is used for the service lines, and red for the emergency (supply) lines. CDL Doubles and Triples Test Question and Answers 2023 [PDF]: Commercial Drivers License Doubles and Triples Endorsements Knowledge Test. You must steer gently when pulling trailers. The final procedure when connecting a rear trailer is to? 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? What does the Driver's manual say about how much space you should keep ahead of your truck? A The pressure in the service line tells how much pressure the relay valves should send to the trailer brakes. 4. 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. 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. B. closed The service brakes slowly move to the fully applied position Any trailer, 7. speed and start spinning again, in turn stopping your skid, All the listed answers would be correct. With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. On a triple combination, the shutoff valves at the rear off the middle trailer should be? There is no obligation whatsoever. Wait for air pressure to reach normal, then push in the red trailer air supply knob. S-cam brakes are the most common style brakes on large trucks today. 0000002446 00000 n Locking jaws open Slow to the safe speed before entering, then accelerate slightly through the curve. A dolly has lights, air tanks, air relays, air lines, air brakes, ABS, electrical connections, etc. If this activity does not load, try refreshing your browser. To do this without wheel chocks you should: When uncoupling the rear semitrailer, you should lower the converter dolly landing gear: When driving a double or triple, you need more space because they: Which of these statements about emergency steering is true? When checking the coupling system, make sure that the locking jaws are around the shank of the. utilize the brakes. C. use stab or controlled braking, Which of these is true? What does the drivers manual say about how much space you should keep ahead of your truck?