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. Often do not have spring brakes Always test the trailer brakes before driving with the hand valve or by pulling the air supply (tractor protection valve) control. The rear trailer of a triple When does the Driver's manual say you should disable the steering axle brake? During normal operation the brakes of the double/triple trailer are controlled by: You are driving at night and you must dim your headlights for traffic. What happens if you cross the Emergency Air Line and the Service Air Line? With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. Air will not be available to release the trailer spring brakes (parking brakes). Describe what the trailer air supply control does. re-couple, You can if you want to, it does not matter. 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. Only a certified diesel mechanic can check this. 27. For all brakes to work on a triple combination, you must have air supply? For emergency braking you should: A Push the brake pedal as hard as you can and hold it there B The rear trailer of a double At section 2 downstream, the speed is 519 m/s. On the first trailer in a set of doubles? Pintle hook latched. 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? If spare tire is carried on converter gear (dolly), make sure it's secured. When you do this, you should hear: B. 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 They provide the air pressure used to operate trailer brakes. weather passes. How should you test the coupling? Wait for air pressure to reach normal, then push in the red trailer air supply knob. When you go to the rear of the last trailer, what should you do to complete this check? %PDF-1.2 % 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. how can you be sure you supplied air to a second trailer? If this lamp is illuminated and does not go out, Please wait while the activity loads. A. always keep your vehicle to the right side of your lane Check them all. Locking jaws closed on A. completely open 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? how much space should be between the upper and lower fifth wheel? You are driving a 100-feet truck with double trailers at 30 mph. mTouch Quiz will automatically populate the fields below. Flammable materials in the front trailer then it must have the placards on that trailer. The rear trailer does not have shut-off valves. 0000001107 00000 n B. slightly raised This has the same value as the %%TIME_USED%% Variable on the Final Screen. With the red knob pushed in on the tractor dash, the service line should have air in it. Converter dolly air tank drain valve: CLOSED Air lines supported and glad hands properly connected. Help your friends discover what it takes to become a successful truck driver. B. the emergency line valve open and release air Open the shut-off valves at the rear of the last trailer and listen for air flow. You can reset the test and retake it as needed. 0000007032 00000 n The converter dolly air tank drain valve on coupled double/triple trailers should be: Answer: Closed. 2 The emergency line valve open and release air B. allow one vehicle length for every 10,000 lbs of gross vehicle weight HK Extended Tank Drain Assembly Kit with 10 Inch Braided Steel Hose 1/4 Inch Drain Valve and Elbow Fitting for Air Compressor 4.7 (463) $1499 FREE delivery Thu, Mar 9 on $25 of items shipped by Amazon Small Business All Tool Depot Air Compressor Drain Valve Replacement for Craftsman Petcock 072-0001, 072-0006 (1-Pack) 4.2 (20) $649 unsafe slow down even further, or better yet, find a safe haven and park until the If your converter dolly has to be moved over a distance to bring it to your semitrailer, you should? You should avoid traveling next to others when possible. door. when driving a truck with more than one trailer, which trailer should be first behind the truck? you want to hook your combination to a second trailer that has no spring brakes. dress gifs. B. slow to a safe speed before entering the curve, then accelerate slightly through it Open, free You shouldn't stop braking. 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. You are visually checking the coupling of a converter dolly to the rear trailer. When uncoupling a rear trailer, you should remove some weight from the dolly by? Contributor: Luke Nold (Experienced truck driver for 5+ years and published writer for Fleet Magazine). Connect Converter Dolly to Front Trailer Back first semitrailer into position in front of dolly tongue. How do you check to make sure the trailer height is correct before coupling? 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. When the road is dry 0000006836 00000 n C. engaging the tractor valve protection control, You must drive through deep or flowing water. You should keep at least ____ seconds of space ahead of you. open, closed, closed: Term. the converter dolly air tank drain valve on couple double/triple trailers should be: to check if the converter dolly is securely coupled to the rear trailer you should: pull gently against the pin of the second trailer. Which of the following statements about off tracking is true? Good speed management says you should: You must drive through deep or flowing water. Be sure air-lines are supported and glad hands are properly connected. 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? 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. A-dolly. Stay up to date on truck driving industry news. 10. Then, the air loss from the leak will lower the air tank pressure quickly. 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 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. Connect Converter Dolly to Rear Trailer Make sure trailer brakes are locked and/or wheels chocked. If a converter dolly is still under the second trailer and you unlock the pintle hook, what will probably happen? speed and start spinning again, in turn stopping your skid, All the listed answers would be correct. When you do this, you should hear: you are driving with double trailer and must use your brakes to avoid a crash. These mirrors: Make things seem smaller and further away than they really are. Nothing, the weight of the trailer will keep it in place, 10. A Commercial Drivers License Overview, Trucking Terminology and Transportation Definitions. Unless you are draining the condensation out of the air tank, then the drain valve 0000006015 00000 n B. restore traction to the tires Connect the Converter Dolly to the Rear Trailer: Test the coupling by pulling against the pin of the second semitrailer. What's a converter dolly? 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? allow "much more space than is needed for ideal driving conditions". Doubles and triples are more likely to turn over than other combination vehicles because of the "crack- the-whip" effect. 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. Each trailer and converter dolly has one or more air tanks. The application only takes one minute. The number and size of air tanks varies among vehicles. You are driving with more than one trailer. You wish to turn right from one two-lane, two-way street to another. Trailer Air Tanks And Shutoff Valves - Page 50. B. pull gently against the pin of the second semitrailer Air pressure is sent from the air tanks to the brakes by relay valves. B Our normal business hours are Monday-Friday 8 a.m. to 5 p.m. (Pacific Time). to re-capture it. This has the same value as the %%WRONG_ANSWERS%% Variable on the Final Screen. The road is dry, and visibility is good. [California Commercial Driver Handbook] The weight of a truck: Is a major factor affecting stopping distance. 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. On a triple combination, the shutoff valves on the rear of the last trailer should be? All material on this website is copyrighted. 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? Converter dollies are connected to front trailers with a? These valves permit closing the air lines off when another trailer is not being towed. 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. The last trailer in a combination is most likely to turn over. The number of correct answers. Please visit using a browser with javascript enabled. The pintle hook should always be secure when the vehicle is in motion. When entering a roundabout, a driver must yield the right-of-way to drivers already in the roundabout and obey all traffic signs. Seriously! Open the emergency line shut-off valve at the rear of the last trailer. The pintle hook? D When you do this, you should hear: A "Glad hands" are coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer. Slow to the safe speed before entering, then accelerate slightly through the curve. When checking your air lines, they must be secure and? A thorough pre-trip inspection should catch any major service line leaks before you begin your trip. C. 3, You are doing a walk around inspection of a double or triple trailer rig. This has the same value as the %%TIME_ALLOWED%% Variable on the Final Screen. Any trailer, 7. The coupling between a rear trailer and a dolly should have a space between the upper and lower fifth wheels of? You should not hear air escaping. If there is securely fastened. C. fully raised, Which of these statements about speed management and braking is true? Each trailer and converter dolly has one or more air tanks. on kingpin. These trailers have no parking brake. 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. For emergency braking you should: Lock pintle hook. 2. Any trailer with a reduced ground clearance When coupling twin trailers, a converter dolly is. C Do converter dollies have spring brakes? Sketch the shape of the passage between sections 1 and 2. Should I Be A Truck Driver? Those that do not have spring brakes have emergency brakes that work from the air stored in the trailer air tank. When does the "driver's manual" advise disconnecting the steering axle brakes to help keep the rig straight? rear brakes will not work properly. Related Question Question: What does this sign mean? Which of these is the correct answer? 0000001582 00000 n you can fuck a pornstar craigslist cars and trucks for sale by owner; kd linear actuator kdpt007 what is ait in the army; native american spiritual cleansing prayer simple spectrum coupon code; . You MUST have air all the way to the back for all the brakes to work. 0000005733 00000 n 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. You must steer gently when pulling trailers. behind the shut-off valve then they need to remain open. Which of these is most likely too occur? Opening the shut off valves on the rear most trailer will ensure the lines are flowing
What Is Brian Krause Doing Now,
Police Support Windshield Badge,
2003 Valley High School Yearbook Albuquerque,
Lawrenceville, Il Jail Mugshots,
Articles T