These valves permit closing the air lines off when another trailer is not being towed. D c. iron %PDF-1.2 % 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. They provide the air pressure used to operate trailer brakes. Many scientists are concerned that the melting of Earth's sea ice will increase Earth's surface temperature. To do this without wheels chocks you should: Supply air to the trailer air system with the tractor and then disconnect the emergency line. A Park the rear trailer against another trailer, chock the tires and lock the trailer 2003-2023 Chegg Inc. All rights reserved. The puzzle: At the far left edge, the plates are in contact, so the path length difference between rays 222 and 333 is zero. But the brakes will hold only as long as there is air pressure in the trailer air tank. 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. rear brakes will not work properly. The application only takes one minute. Before coupling a trailer, you should make sure it is at the right height using? Ideal for replacing a worn, leaky drain valve on a compressor. Hit the article below to see specific information about AOBRDs! A connection device of one axle used to disconnect a semitrailer combination vehicle Before you can supply air to the air tanks of a second trailer you need to. 0000006836 00000 n You may be timed. Light cords firmly in sockets on trailer. To prevent trailers from rolling over, you must steer gently and go slowly around corners, on ramps, off ramps and curves. Otherwise, the dolly tow bar may fly up, possibly causing injury and making it very difficult to re-couple. With the red knob pushed in on the tractor dash, the service line should have air in it. D Each trailer and converter dolly has one or more air tanks. How do you check to make sure trailer height is correct before coupling? 0000001375 00000 n With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. 0000010306 00000 n How can you test that air flows to all trailers? If not, there is a problem. Go to the rear of second trailer and open the emergency line shut-of valve. Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. Learn more and apply here: TruckingTruth was founded by Brett Aquila (that's me! 0000004668 00000 n The dolly tow bar may fly up open the shut-off valves at the rear of the first trailer and close the shut-off valves at the rear of the second trailer, enclose converter dolly air tank drain valves When does the "driver's manual" advise disconnecting the steering axle brakes to help 1/2 to 3/4 of an inch Study section 6.2 if you can't answer all of these questions. When testing the coupling of the double trailer the landing gears of the rear trailer should be: You want to hook your combination to a second trailer that has no spring brakes. These mirrors: Make things seem smaller and further away than they really are. You will speak with recruiters today. You should keep at least ____ seconds of space ahead of you. rear trailer. In order to receive your Doubles and Triples endorsement, it is required that you pass the state's official CDL written Knowledge exam. You are driving with double trailers and must use your brakes to avoid a crash. C The road is dry and the visibility is good. Explore now! Nothing, the weight of the trailer will keep it in place, 10. B. you should avoid traveling next to others whenever possible If loading fails, click here to try again. If there is A. for coupled doubles and triples, be sure that the pintle hook is in the open position Doubles and triples take up more space than other commercial vehicles. You should be sure the converter dolly air tank drain valves are _____ and the pintle hook is ____. In a certain electronic device, a three-stage amplifier is desired, whose overall voltage gain is 42 dB. To check that the trailer emergency brakes are working properly, you should pull out the trailer air supply control and? Only trailers designed to be pulled with another trailer behind it will have a shut off valve. C A major leak in the emergency line will cause the tractor protection valve to close and the trailer emergency brakes to come on. View the price and details of this FINSBURY PUMP SYSTEMS 400L (SINGLE STAGE) 5.5HP HONDA GX PETROL ENGINE (18M HOSE) FIRE WATER TANK | Mobile fire units. 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. How can you be sure you supplied air to a second trailer? 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. 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 1) the first one is to pump down the air pressure in the system between 20 and 45psi (pounds per square inch) the trailer air supply will pop out, shutting air off to the trailer. Compressed air usually has some water and some compressor oil in it. The application only takes one minute. on kingpin. 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. Doubles and triples must be driven very smoothly to avoid rollover or jacknife. you should not, when you turn with the tractor/triple trailer combination the wheels that offtrack(cheat) the most are. B. slow to a safe speed before entering the curve, then accelerate slightly through it Speed for other vehicles is often too fast for a multi-combination unit! Join 50,000+ users around America to get your Commercial Driver License today! Open the emergency line shut-off valve at the rear of the last trailer. mTouch Quiz will automatically populate the fields below. A. completely open A converter dolly is still under the second trailer when you unlock the pintle hook. In the coupling system, the locking jaws should be fixed around? C When uncoupling, you should never unlock the _______ with the dolly still under the rear trailer. This has the same value as the %%PERCENTAGE%% Variable on the Final Screen. 0000001775 00000 n which of these statements about the handling of doubles and triples is true ? A) one inch of space . For emergency braking you should: 0000005554 00000 n A The Verge logo. Flammable materials in the front trailer then it must have the placards on that trailer. 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. what is likely to happen if the pintle hook is unlocked with the dolly still under the second trailer? The lightest trailer The road is dry, and visibility is good. Did you know you can fill out one quick form here on TruckingTruth and apply to several companies at once for paid CDL training? B. slightly raised King pin. What is a converter dolly? Time limit varies by state. Which of these are the correct positions for shut-off valves in doubles and triples? Time allowed (Requires timer add on). The road is dry and visibility is good. A dolly has lights, air tanks, air relays, air lines, air brakes, ABS, electrical connections, etc. D A dolly should be pulled out from a rear trailer using? If a converter dolly is still under the second trailer and you unlock the pintle hook, what will probably happen? [California Commercial Driver Handbook] The weight of a truck: Is a major factor affecting stopping distance. Use only the trailer brakes to re-capture it. 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. B You may not notice a major leak in the service line until you try to put the brakes on. Closed, free, 8. The emergency line valve open and release air They are filled by the emergency (supply) line from the tractor. 7.3 Inspecting Doubles and Triples = Additional Things to Check During a Walkaround Inspection. Be sure pintle-eye of dolly is in place in pintle hook of trailer(s). In an application in which vGS=vDS=Vsupply=1.8V,v_{G S}=v_{D S}=V_{\text { supply }}=1.8 \mathrm{V},vGS=vDS=Vsupply=1.8V, a drain current of 2 mA is required of a device of minimum length of 0.18m.0.18 \mu \mathrm{m}.0.18m. That there is no space between upper and lower sixth wheel. That there is some space between the upper and lower fifth wheel. With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. Should the pintle hook be latched or unlatched when backing a dolly under the second trailer? 11 During normal operation the brakes of the double/triple trailer are controlled by: If one air system is very low on pressure _______. A. opening the air tank petcock Doubles and triples are more likely to turn over than other combination vehicles because of the "crack- the-whip" effect. You should be sure the converter dolly air tank drain . What does the drivers manual say about how much space you should keep ahead of your truck? Trailer Air Tanks And Shutoff Valves - Page 50. 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. Antilock Braking Systems on Converter Dollies, Converter dollies built on or after March 1, 1998, are required to have antilock brakes. These dollies will have a yellow lamp on the left side of the dolly Questions You Should Know For Doubles And Triples 1. 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. If there is a trailer 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? B. do not need to be checked as often as flat mirrors because they show a larger area
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