0000002446 00000 n Either the front or the rear brakes will not work properly or fully. 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. 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. If you have traffic on both sides of your vehicle and something is blocking your lane, a move to the right still be best. More driving knowledge, questions and answers, online practice tests for obtaining a drivers . Newer trailers have spring brakes just like trucks and truck tractors. High Road 2.0! To prevent trailers from rolling over, you must steer gently and go slowly around corners, on ramps, off ramps and curves. The trailer height is right when: The trailer will be raised slightly when the converter dolly is backed under it. Describe what the trailer air supply control does. Why should you not use the trailer hand valve while driving? Opening the shut off valves on the rear most trailer will ensure the lines are flowing you should check the trailer height before connecting a converter dolly to a second or third trailer. B Each tank has a drain valve on it, and you should drain each tank every day. Pintle hook latched. 0000010783 00000 n D D The road is dry and visibility is good. Only a certified diesel mechanic can check this. To do this without wheels chocks you should: Supply air to the trailer air system with the tractor and then disconnect the emergency line. Do converter dollies have spring brakes? 0000003998 00000 n 0000008915 00000 n Allow more following distance. You should hear air escaping, showing the entire system is charged. We'll help you make the right choices and prepare for a great start to your trucking career. You can find it here: High Road 2.0. trailer << /Size 59 /Info 20 0 R /Root 22 0 R /Prev 29211 /ID[] >> startxref 0 %%EOF 22 0 obj << /Type /Catalog /Pages 19 0 R >> endobj 57 0 obj << /S 66 /Filter /FlateDecode /Length 58 0 R >> stream B. allow one vehicle length for every 10,000 lbs of gross vehicle weight Studying and applying oneself is the only way to successfully learn the information you need to know to pass all testing required to obtain your CDL. Seriously! These mirrors: Make things seem smaller and further away than they really are. To check that the trailer emergency brakes are working properly, you should pull out the trailer air supply control and? 2. For emergency braking you should: When you turn with the tractor/triple trailer combination the wheels that off-track (cheat) the most are: You should check trailer height before connecting a converter dolly to a second or third trailer. 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 puzzle: At the far left edge, the plates are in contact, so the path length difference between rays 222 and 333 is zero. 1 Closed, latched D 9 If you feel Locking jaws closed on B. you can almost always stop more quickly than you can turn There are two types of converter dollies. d. protein. That there is no space between upper and lower fifth wheel. you are driving on a slippery road during the day. B. open; latched 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 . A. allow "much more space" than is needed for ideal driving conditions 0000010306 00000 n what is likely to happen if the pintle hook is unlocked with the dolly still under the second trailer? B. closed 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. If this lamp is illuminated and does not go out, You will have greater length and more dead axles to pull with your drive axles than other drivers. second trailer will be connected, The dolly will have a yellow lamp on the left side, The dolly will have a yellow lamp on the right side, The dolly will have a red lamp on the left side, The dolly will have a red lamp on the right side. you are driving a 100ft truck eith double trailers at 50mph. C. make things look larger and closer to you than they really are, When hauling triple trailers at a speed less than 40 mph, you should leave at least _____ second(s) for every ten feet of your truck between you and the vehicles ahead of you. 10 Should the shut-off valves on the trailers be open or closed on a set of double trailers? Open. What does the Commercial Driver Handbook say about how much space you should keep ahead of your truck? Take this same test in our other testing modes How to Get a Hazardous Materials Endorsement, What is a CDL? The rear trailers shut-off valves should be closed and the front open. 0000009556 00000 n you are driving a set of doubles and a set of trailer wheels goes in a skid. A truckers workspace is a small moving office Read More. This has the same value as the %%TIME_ALLOWED%% Variable on the Final Screen. (done) Chp 23: Cash Flow + Working Capital, Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer. a sudden movement with the steering wheel can result in a tipped over rear trailer, you wish to turn right from one two-lane, two-way street to another. A What will happen if there is a major leak in the service air line? Time used (Requires timer add on). If you do, the brakes may not work correctly. Go to Section 4: Other Topics This question is in Section 4: Other Topics of our CDL Test Guide. A connection device of one axle used to disconnect a semitrailer combination vehicle They are filled by the emergency (supply) line from the tractor. If one air system is very low on pressure _______. 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. The total number of questions. 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. A converter dolly is still under the second trailer when you unlock the pintle hook. Which trailer should come first behind the tractor? The rear trailer does not have shut-off valves. safe speed would be 40 MPH. Watch the wording of the question AND the answers A safe driver will look for all of the above. Make sure to visually inspect the fifth wheel and that the locking mechanism is 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. On double and triple combinations, you must make sure that which of these is secure? Secure converter gear support in raised position. You should avoid traveling next to others when possible. 0000008166 00000 n How do you know if your converter dolly is equipped with antilock brakes? 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If the dolly is a two axle unit then 1 You are driving a tractor with multiple trailers. fifth wheel, so trailer is raised slightly when dolly is pushed under it. kingpin, That there is grease between upper and lower fifth wheel. Use controlled or stab braking 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. 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 you go to the rear of the last trailer, what should you do to complete this check? 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 door. Charge the system and pump the brakes with the window down. 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. Go to the rear of the rig. will have a lamp on the drivers side. 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? 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 hear air escaping, showing the entire system is charged. This will prevent water and dirt from getting into the coupler and the air lines. True or False? You should keep at least ____ seconds of space ahead of you. A driver of a vehicle with double or triple trailers will have greater length and more dead axles to pull, increasing the likelihood of a wreck. C. posted speed limits on curves are safe for all trucks, Empty trucks: When does the "driver's manual" advise disconnecting the steering axle brakes to help . 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. paramount to safe driving. A safe speed on a curve for a straight truck or a single trailer combination vehicle may be too fast for a set of doubles or triples. A. air escape from the open valve Also available in App Store & Google Play. Pull gently against them in a low gear to make sure the brakes work. to do this without wheel chocks you should: supply air to the trailer air system with the tractor and then disconnect the emergency line. Doubles and triples must be driven very smoothly to avoid rollover or jackknife. 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? By clicking on "Sign Up", you agree to our Terms of Use and Privacy Policy. You should NOT: 0000008187 00000 n When does the Driver's manual say you should disable the steering axle brake? 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. Any vehicle, regardless of size, designed to transport 16 or more persons, including the driver. B. you need about four times as much stopping distance at 40 mph as at 20 mph 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: In a certain electronic device, a three-stage amplifier is desired, whose overall voltage gain is 42 dB. symptoms of a bad fuel tank selector switch. If there is a trailer the rig will continue moving in a straight line no matter how much the steering wheel is turned. 0000007487 00000 n B. for doubles and triples, the fifth wheel should be all the way towards the tractor Please visit using a browser with javascript enabled. Should the converter dolly air-tank drain valve be open or closed on a double trailer combination? It is important not to let water and oil build up in the air tanks. Safety chains secured to trailer (s). A thorough pre-trip inspection should catch any major service line leaks before you begin your trip. When uncoupling a rear trailer, you should remove some weight from the dolly by? 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: They provide the air pressure used to operate trailer brakes. This has the same value as the %%PERCENTAGE%% Variable on the Final Screen. To check air flows to all trailers, you should let air pressure reach normal then? B. Once that's complete, then its an easy push back and the B. slightly raised You wish to turn right from one two-lane, two-way street to another. B. slightly open You are visually checking the coupling of a converter dolly to the rear trailer. inspection of all equipment. They are filled by the emergency (supply) line from the tractor. You are driving with more than one trailer. A Commercial Drivers License Overview, Trucking Terminology and Transportation Definitions. and ensuring it is secure. A dolly should be pulled out from a rear trailer using? It is very important to keep the air supply clean. You must stop, yield to traffic and pedestrians, and only proceed when safe. Go to the rear of second trailer and open the emergency line shut-of valve. 9 Questions You Must Ask, Decide if Truck Driving is The Correct Career Path, Do Not Sell or Share My Personal Information. How much space should be between the upper and lower fifth wheels? Make sure you do not get in a spot you cannot pull straight through. Make sure you have large enough gaps before entering or crossing traffic. You will speak with recruiters today. None of the above, 4. The emergency brakes come on whenever the air supply knob is pulled out or the trailer is disconnected. This has the same value as the %%TOTAL%% Variable on the Final Screen. How many different ways of coupling and uncoupling trailer combinations are there? Air pressure is sent from the air tanks to the brakes by relay valves. Please use the form below to contact our customer service or sales team. You are visually checking the coupling of a converter dolly to the rear trailer. Submit your email at the end of the test. Air Storage and Drain Tanks: Air storage tanks are used to hold compressed air. Delivering to. Some areas of concern are discussed below. Antilock Braking Systems on Converter Dollies, Converter dollies built on or after March 1, 1998, are required to have antilock 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? Slow to a safe speed before entering the curve, then coast through the curve. Take special care when pulling two and three trailers. Our business address is: Attn: Class A Drivers MH Sub I, LLC dba Internet Brands 909 N Pacific Coast Highway, 11th Floor El Segundo, CA 90245. None of the above, 5. Definition. The dolly tow bar may flip up causing bodily injury and making it very difficult to Open The driver must yield the right-of-way to other vehicles when merging and when entering a highway from an alley. These mirrors: make things seem smaller & further away then they really are. A. open the shut-off valves at the rear of both trailers Closed, free, 8. If a converter dolly is still under the second trailer and you unlock the pintle hook, what will probably happen? When the road is slippery You have not finished your quiz. Any time you have to Air pressure is sent from the air tanks to the brakes by relay valves. Some do. In order to receive your Doubles and Triples endorsement, it is required that you pass the state's official CDL written Knowledge exam. The service brakes slowly move to the fully applied position

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