These dollies will have a yellow lamp on the left side of the dolly Questions You Should Know For Doubles And Triples 1. None Open, latched Converter dolly air tank drain valve: CLOSED Air lines supported and glad hands properly connected. When connecting two trailers the converter dolly is connected to the rear trailer first. Allow more following distance. When you do this, you should hear: Ais escape from the open valve. When uncoupling, you should never unlock the _______ with the dolly still under the rear trailer. 27. 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. 0000009577 00000 n A. completely open Clean the couplers and rubber seals before a connection is made. You can test that air is flowing to all trailers by opening? This will prevent water and dirt from getting into the coupler and the air lines. 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? Air flows steadily and isentropically through a passage. Typically depends on the axle count. Air escape from the open valve 4. You should keep at least _____ seconds of space ahead of you. 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. C. open, except the one connected to the rear trailer should be closed, During normal operation the brakes on double and triple trailers are controlled by the: When the road is slippery Check them all. Seriously! The driver will be required to complete this requirement in three eight hour shifts. 1. A. for coupled doubles and triples, be sure that the pintle hook is in the open position If there is a trailer With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. doubles/triples flip flop over from quick steering movements more easily than many other vehicles. Dont hesitate to take advantage of our practice tests in each category specific to your needs. Which of the following must be connected when coupling tractor to trailer or trailer to trailer? coupled to the rear of a tractor-trailer combination forming a double bottom rig, Careful of the wording! Which of these is most likely too occur? Push the brake pedal as hard as you can and hold it there 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? It is important to check the height of the trailer before connecting a converter dolly to a trailer. mTouch Quiz will automatically populate the fields below. To prevent trailers from rolling over, you must steer gently and go slowly around corners, on ramps, off ramps and curves. when testing the coupling of a double trailer the landing gears of the rear trailer should be, you must drive through deep or flowing water . Which of these are the correct positions for shut-off valves in doubles and triples? unsafe slow down even further, or better yet, find a safe haven and park until the C What should you check for when inspecting a converter dolly? you are doing a walkaround inspection of a double or triple trailer rig. D. Make sure the spare tire is secured, if it has one. Should the shut off valves on the rear of the first trailer be open or closed on a set of double trailers? When checking the fifth wheel, you should make sure that it has enough? C. engaging the tractor valve protection control, You must drive through deep or flowing water. 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. 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. Make sure you do not get in a spot you cannot pull straight through. Definition. We'll help you make the right choices and prepare for a great start to your trucking career. _______ should be tested with the hand valve but controlled in normal operation with the foot pedal. 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 _______. Time allowed (Requires timer add on). In order to receive your Doubles and Triples endorsement, it is required that you pass the state's official CDL written Knowledge exam. D Each trailer and converter dolly has one or more air tanks. What types of trailers can get stuck on raised crossings? With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. The emergency line valve open and release air what is likely to happen if the pintle hook is unlocked with the dolly still under the second trailer? Why is there still destructive interference? You are doing a walk around inspection of a double or triple trailer rig. They provide the air pressure used to operate trailer brakes. Our normal business hours are Monday-Friday 8 a.m. to 5 p.m. (Pacific Time). Eventually, the air will leak away, and then there will be no brakes. None of the above, 5. Disconnect the glad-hand at the front of the first trailer and listen for air flow. Take special care when pulling two and three trailers. You should avoid traveling next to others when possible. The rear trailers shut-off valves should be closed and the front open. C Any single vehicle with a GVWR of 26,001 or more pounds, or any such vehicle towing another not in excess of 10,000 pounds. Be more careful in adverse conditions. You need to be aware of how parking lots are arranged in order to avoid a long and difficult escape. When turning a double or triple at an intersection, the turn often cannot be completed without swinging wide. How much space should be between the upper and lower fifth wheels? In bad weather, slippery conditions and mountain driving, you must be especially careful if you drive double and triple bottoms. Which of the following is true about loading cargo into double or triple trailers? B. releasing the pintle hook Study section 6.2 if you can't answer all of these questions. 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? Make sure pintle hook is latched. will have a lamp on the drivers side. A. open If there is If your tractor protection valve doesn't work properly, then if an air hose starts to leak what could happen? The emergency brakes come on whenever the air supply knob is pulled out or the trailer is disconnected. Ensuring the safety of the public starts with a thorough inspection of all equipment. To uncouple the rear trailer in a set of doubles, the shut-off valve at the rear of the front trailer should be: Closed. A. allow "much more space" than is needed for ideal driving conditions B 8. you are visually checking the coupling of a converter dolly to the rear trailer. The rear trailer of a double A converter dolly is If a converter dolly has spring brakes, you release the brakes by You have connected the converter dolly to the front semitrailer and then connected the rear semitrailer to the converter dolly. B. keep gentle pressure on the brakes while going through the water and for a short distance after coming out the fifth wheel, so trailer is raised slightly when dolly is pushed under it. 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. Which of the following will occur? A. use the engine brake or speed retarder Park on level ground, put chock on the tires, and charge the air tank. Like a trailer, a dolly equipped with ABS will have a yellow indicator light on the left side. You can reset the test and retake it as needed. Hit the article to see the way to back up your trailer like a pro! There are more critical parts to check when you have two or three trailers. "Glad hands" are coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer. The braking systems of double and triple trailers are different than those of straight trucks because doubles and triples. True! A connection device of one axle used to disconnect a semitrailer combination vehicle Only trailers designed to be pulled with another trailer behind it will have a shut off valve. This has the same value as the %%PERCENTAGE%% Variable on the Final Screen. Safety chains should be secured to trailer(s). Watch the wording of the question AND the answers A safe driver will look for all of the above. A For emergency braking you should: which of these statements about emergency steering is true? Please visit using a browser with javascript enabled. Chock the tires, park on level ground and charge the trailer air tank if it does Take this same test in our other testing modes How to Get a Hazardous Materials Endorsement, What is a CDL? Terms in this set (43) Converter dollies are used to connect: A tractor-trailer combination to another trailer. A CDL is required to drive any of the following vehicles: A vehicle with two separate parts - the power unit (tractor) and the trailer. Pull gently against the pin of the second trailer. True! Pull gently against them in a low gear to make sure the brakes work. At TruckingTruth we'll help you decide if trucking is right for you and help you get your career off to a great start. retrovirus $_____________________________$. You are doing a walkaround inspection of a double or triple trailer rig. Be sure air-lines are supported and glad hands are properly connected. Any trailer with a reduced ground clearance Air pressure is sent from the air tanks to the brakes by relay valves. When does the "driver's manual" advise disconnecting the steering axle brakes to help keep the rig straight? Once that's complete, then its an easy push back and the The road is dry and visibility is good. Learn more and apply here: TruckingTruth was founded by Brett Aquila (that's me! 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 When only pulling one trailer, be sure the shut-off valves are all in the fully closed position. C. use stab or controlled braking, Which of these is true? with the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the trailer. the crack-whip effect that triubkes trucks with trailers is most likely to cause a tip over when. If you feel Pickup at South Loop. c. iron Some large trucks have curved (convex or spot) mirrors. A. closed; latched They provide the air pressure used to operate trailer brakes. When you do this, you should hear: you are driving with double trailer and must use your brakes to avoid a crash. For emergency braking you should: 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. Remember: The trailer air brakes are supplied with air using the emergency line (also called the supply line). The couplers have a rubber seal that prevents air from escaping. The dolly tow bar may fly up, possibly causing injury, and making it very difficult to Did you know you can fill out one quick form here on TruckingTruth and apply to several companies at once for paid CDL training? You are driving with double trailers and must use your brakes to avoid a crash. 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. You should keep at least ____ seconds of space ahead of you. For emergency braking you should: You are doing a walk around inspection of a double or triple trailer rig. How should you test the coupling? When checking the coupling system, make sure that the locking jaws are around the shank of the. 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. This has the same value as the %%TIME_USED%% Variable on the Final Screen. There is no obligation whatsoever. fumoto drain valve. go to the rear of the second trailer and open the emergency line shut off, before you can supply air to the air tanks of the second trailer you need too, open the shut-off valves at the rear of the first trailer & close the shut-off valves at the rear of the second trailer. You should be sure the converter dolly air tank drain . Driving doubles/triples is also more dangerous in hot and cold weather driving, as well as on mountain roads. 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. you are driving a 100ft truck eith double trailers at 50mph. Before coupling a trailer, you should make sure it is at the right height using?