That there is no space between upper and lower sixth wheel. 0000001582 00000 n Locking jaws closed on A If it goes low enough, the trailer emergency brakes will come on. you are visually checking the coupling of a converter dolly to the rear trailer. A Doubles and triples are more likely to turn over than other combination vehicles because of the "crack- the-whip" effect. D How should you test the coupling? You will not be tested on uncoupling twins unless you want to get a double/triple trailer endorsement on your license. 0000010285 00000 n Learn more and apply here: TruckingTruth was founded by Brett Aquila (that's me! 0000007487 00000 n Allow much more space than is needed for ideal driving condition. unsafe slow down even further, or better yet, find a safe haven and park until the what is likely to happen if the pintle hook is unlocked with the dolly still under the second trailer? When uncoupling a rear trailer, your rig should be parked in a straight line on? A. brake and downshift in a curve They provide the air pressure used to operate trailer brakes. 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. That there is some space between the upper and lower fifth wheel. Doubles and triples must be driven very smoothly to avoid rollover or jackknife. 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. Time allowed (Requires timer add on). What is a converter dolly? C. use a light touch on the accelerator and brake pedals, For coupled double and triple trailers, all of the converter dolly shut-off valves should be: The emergency brakes come on whenever air pressure in the emergency line is lost. You should keep at least _____ seconds of space ahead of you. B speed and start spinning again, in turn stopping your skid, All the listed answers would be correct. Never pull any trailer without visually inspecting the fifth wheel locking bar The emergency line valve open and release air 0000007508 00000 n If you leave this page, your progress will be lost. The lightest trailer Email Updates When New Articles Are Posted. [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]. How do you check to make sure trailer height is correct before coupling? 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 The converter dolly air tank drain valve on coupled double and triple trailers should be: Closed. 10. What is the most common foundation brake found on heavy vehicles? To do this without wheels chocks you should: Supply air to the trailer air system with the tractor and then disconnect the emergency line. re-couple, You can if you want to, it does not matter. 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. (done) Chp 23: Cash Flow + Working Capital, Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer. C 0000009556 00000 n This has the same value as the %%TIME_USED%% Variable on the Final Screen. In bad weather, slippery conditions and mountain driving, you must be especially careful if you drive double and triple bottoms. Types of converter dollies. There are more critical parts to check when you have two or three trailers. A. allow "much more space" than is needed for ideal driving conditions When you do this, you should hear: Ais escape from the open valve. dress gifs. Open the emergency line shut-off valve at the rear of the last trailer. If your tanks have automatic drains, they will keep most moisture out, but you should still open the drains to make sure. What does the Commercial Driver Handbook say about how much space you should keep ahead of your truck? The converter dolly air tank drain valve on coupled double/triple trailers should be: You are driving a 100-feet truck with double trailers at 50 mph. Which of these statements about the handling of doubles and triples is true? 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. C. fully raised, Which of these statements about speed management and braking is true? 1/4 in. A Why is there still destructive interference? On the first trailer in a set of doubles? The pintle hook? There is a school zone ahead. This has the same value as the %%TIME_ALLOWED%% Variable on the Final Screen. C. drive through quickly, With the hand valve on, you should test the trailer brakes by opening the service valve line at the rear of the rig. There are two types of converter dollies. B. restore traction to the tires The lighter semitrailer should be in first position behind the tractor. coupled to the rear of a tractor-trailer combination forming a double bottom rig, Careful of the wording! inspection of all equipment. When coupling, be sure to couple the proper glad hands together. It's a fifth wheel, not a sixth wheel. Make a sketch that explains this phenomenon in terms of a feedback loop . It is extremely unlikely you will drive a trailer built before 1975, but for the written exam, you still may need to know that trailers built before 1975 were not required to have spring brakes. and ensuring it is secure. You are driving a 100 foot twin trailer combination at 50 mph. The dolly tow bar may fly up, possibly causing injury and making it very difficult to re-couple. Each trailer and converter dolly has one or more air tanks. Your tractor protection valve control should pop out, or go from normal to emergency position, when air pressure falls into what range? Which trailer should come first behind the tractor? Closed, free, 8. . A connection device of one axle used to disconnect a semitrailer combination vehicle Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? Contributor: Luke Nold (Experienced truck driver for 5+ years and published writer for Fleet Magazine). What is most likely to happen if the trailer protection valve of a double or triple trailer does not function correctly? B. for doubles and triples, the fifth wheel should be all the way towards the tractor When uncoupling a rear trailer, you should remove some weight from the dolly by? When you go to the rear of the last trailer, what should you do to complete this check? Locking jaws closed on You want to lock your combination to a second trailer that has no spring brakes. Remember: The trailer air brakes are supplied with air using the emergency line (also called the supply line). 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. behind the shut-off valve then they need to remain open. 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. You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. The trailer height is right when: The trailer will be raised slightly when the converter dolly is backed under it. Locking jaws closed on C. 3, You are doing a walk around inspection of a double or triple trailer rig. Allow more following distance. The tanks will hold enough air to allow the brakes to be used several times even if the compressor stops working. When inspecting doubles and triples you must make sure there is air all the way to the back of the last trailer, otherwise what may not work? The road is dry and the visibility is good. You will have greater length and more dead axles to pull with your drive axles than other drivers. Mar 2 - Mar 3. If there is a trailer 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. How much space should be between the upper and lower fifth wheels? kingpin. A 360 degree area of awareness is 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. Some areas of concern are discussed below. New! They provide the air pressure used to operate trailer brakes. 9 Questions You Must Ask, Decide if Truck Driving is The Correct Career Path, Do Not Sell or Share My Personal Information. The driver will be required to complete this requirement in three eight hour shifts. True! You have not finished your quiz. 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. Because of this, which of the following vehicle parts is most likely to tip over? D Pickup at South Loop. Some do. during normal operation the brakes of the double/triple trailer are controlled by : which of these will result in the best control on curves? C NPT thumbscrew style design enables easy installation. will have a lamp on the drivers side. %PDF-1.2 % The road is dry and visibility is good. 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. a. blood Our normal business hours are Monday-Friday 8 a.m. to 5 p.m. (Pacific Time). We'll help you make the right choices and prepare for a great start to your trucking career. Release Dolly breaks by opening the air tank petcock or if the dolly has a spring break, use the Dolly parking brake control . [Flashing Signals, Traffic Signals, Chapter 5 - Signals, Signs and Pavement Markings, North Carolina Driver's Handbook], One component of the DUI sentence in the state of Tennessee is twenty-four hours of litter pick-up wearing clothing that says "I am a drunk driver." In a certain electronic device, a three-stage amplifier is desired, whose overall voltage gain is 42 dB. 0000005733 00000 n The heavier trailer should be in the rear. A major leak in the emergency line will cause the tractor protection valve to close and the trailer emergency brakes to come on. This is CDL Doubles and Triples Test 3in our original Classic Mode. To check if the converter dolly is securely coupled to the rear trailer you should: Pull gently against the pin of the second trailer. Go to the rear of the rig. Those that do not have spring brakes have emergency brakes that work from the air stored in the trailer air tank. c. iron Calculate the voltage gain of each. Slow to the safe speed before entering, then accelerate slightly through the curve. mTouch Quiz will automatically populate the fields below. A. release the spring brakes and check for movement How do you check to make sure the trailer height is correct before coupling? Which of these is NOT a good thing to do when driving on slippery roads? View More Details. All ABS equipped units Any vehicle required by federal regulations to be placarded while transporting hazardous materials. Delivering to. A Commercial Drivers License Overview, Trucking Terminology and Transportation Definitions. There is no requirement or exact standard for color coding. What do you check when making a visual check of coupling? For emergency braking you should: which of these statements about emergency steering is true? D 0000003240 00000 n A vehicle transporting hazardous materials is required to display placards where? 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. The rear trailers shut-off valves should be closed and the front open. The coupling between a rear trailer and a dolly should have a space between the upper and lower fifth wheels of? We have a new version of this program. your vehicle is so long that you must swing wide to make a turn. You are doing a walk around inspection of a double or triple trailer rig. What is likely to happen? The road is dry and visibility is good. What happens when there is a major leak in the emergency air line? If loading fails, click here to try again. Shut off valves are only used on trailers designed to be towed in conjunction with other trailers (doubles / triples). C. closed, You can release the dolly brakes by: Air flows steadily and isentropically through a passage. b. cell you are driving a set of doubles and a set of trailer wheels goes in a skid. Chock the tires, park on level ground and charge the trailer air tank if it does What is a converter dolly? Like a trailer, a dolly equipped with ABS will have a yellow indicator light on the left side. You need to stop braking because it's necessary for you to speed up, When you are in a drive-wheel braking skid, the first thing to do is STOP BRAKING! S-cam brakes are the most common style brakes on large trucks today. When connecting the glad hands, press the two seals together with the couplers at a 90-degree angle to each other. 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. Simply click in your answer to each CDL practice test question. Which of these statements about quick steering movements and doubles/triples is true? how much space should be between the upper and lower fifth wheel? 0000002446 00000 n Good speed management says you should: You must drive through deep or flowing water. Unlock the pintle hook only if the trailer it is under is loaded, otherwise the dolly tow bar may fly up, possibly causing injury and making it very difficult to re-couple. Pintle hook latched. C. use stab or controlled braking, Which of these is true? You will speak with recruiters today. A. you can steer more quickly and safely if you hold the wheel with one hand You should be sure the converter dolly air tank drain valves are _____ and the pintle hook is ____. Any trailer, 7. You should keep at least ____ seconds of space ahead of you. A-dolly. You should keep at least ____ seconds of space ahead of you. 0000001375 00000 n B. the emergency line valve open and release air You must treat a flashing red signal as you would treat a STOP sign. When you do this, you should hear: The driver must yield the right-of-way to other vehicles when merging and when entering a highway from an alley. Try our free CDL Doubles and Triples Test Question and Answers Quiz online. Pull gently against them in a low gear to make sure the brakes work. A green traffic light allows the driver to go. Close the emergency line shut-off valve at the rear of the trailer. At TruckingTruth we'll help you decide if trucking is right for you and help you get your career off to a great start. What value of channel width must the design use? This will let the rear wheels roll again and keep the rear wheels from sliding. You need to brake in order to regain control. 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? Explore now! Do converter dollies have spring brakes? Follow the procedures described later in this section. The road is dry, and visibility is good. What three methods can you use to secure a second trailer before coupling? Which is most likely to tip over: Safety should never take second place, so know your stuff! Charge the system and pump the brakes with the window down. B. releasing the pintle hook Open the shut-off valves at the rear of the last trailer and listen for air flow. This means. A. use a low gear To do this without wheel chocks you should: Empty trucks: When parking your double or triple combination, you should look for a parking space What does the Driver's manual say about how much space you should keep ahead of your truck? 0000001107 00000 n 1/2 to 3/4 of an inch B You should hear air escaping, showing the entire system is charged. The crack the whip effect will topple the rear trailer first. Antilock Braking Systems on Converter Dollies, Converter dollies built on or after March 1, 1998, are required to have antilock brakes. Once that's complete, then its an easy push back and the You can reset the test and retake it as needed.
