[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." doubles/triples flip flop over from quick steering movements more easily than many other vehicles. 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. The tanks will hold enough air to allow the brakes to be used several times even if the compressor stops working. You may be timed. C. closed; unlatched, Which of these will result in the best control on a curve? We wish you the best of luck in your endeavors and are pleased to be of assistance. 7.3 Inspecting Doubles and Triples = Additional Things to Check During a Walkaround Inspection. To uncouple the rear trailer in a set of doubles, the shut-off valve at the rear of the front trailer should be: Closed. Sketch the shape of the passage between sections 1 and 2. You will speak with recruiters today. Air escape from the open valve The emergency brakes come on whenever the air supply knob is pulled out or the trailer is disconnected. 0000001582 00000 n A. countersteer c. iron Definition. You should be sure the converter dolly air tank drain valves are _____ and the pintle hook is ____. dress gifs. Which of the following will probably happen if you are driving a double rig and a set of trailer wheels goes into a skid? 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. You are driving a 100 foot twin trailer combination at 50 mph. Always unlock the pintle hook with the dolly still under the rear trailer. B. Driving doubles/triples is also more dangerous in hot and cold weather driving, as well as on mountain roads. You can find it here: High Road 2.0. 0000001956 00000 n You must steer gently when pulling trailers. 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. C. if you have traffic on both sides of your vehicle and something is blocking your lane, a move to the right may still be best, To uncouple the rear trailer in a set of doubles, the shut-off valve at the rear of the front trailer should be: 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. 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. When driving doubles or triples how should they be driven to avoid rollover or jackknifing: 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? A. always keep your vehicle to the right side of your lane Locking jaws closed on C. closed, You can release the dolly brakes by: C. fully raised, Which of these statements about speed management and braking is true? High Road 2.0! To check air flows to all trailers, you should let air pressure reach normal then? you should keep atleast __seconds of space ahead of you. 0000010306 00000 n Have little braking power because they are small 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. The heavier trailer should be in the rear. Never unlock the pintle hook with the dolly still under the rear trailer. Newer trailers have spring brakes just like trucks and truck tractors. None of the above, 2. Learn more and apply here: TruckingTruth was founded by Brett Aquila (that's me! The A-dolly has a single drawbar with a single, centered hitching point. The coupling between a rear trailer and a dolly should have a space between the upper and lower fifth wheels of? 0000005554 00000 n The last trailer in a combination is most likely to turn over. 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 dolly tow bar may fly up, possibly causing injury, and making it very difficult to 1. [California Commercial Driver Handbook] The weight of a truck: Is a major factor affecting stopping distance. driven with care to avoid losing control, Make sure the spare tire is secured, if it has one, Make sure the converter dolly air tank drain valve is closed, Make sure safety chains are secured to the trailers, All of the above. Seriously! The trailer height is right when: The trailer will be raised slightly when the converter dolly is backed under it. 4. Pintle hook latched. Air will not be available to release the trailer spring brakes (parking brakes). Hit the article below to see specific information about AOBRDs! The pressure in the service line tells how much pressure the relay valves should send to the trailer brakes. Pintle-eye of dolly in place in pintle hook of trailer (s). Go to the rear of the rig. If loading fails, click here to try again. You should be sure the converter dolly air tank . Should the pintle hook be latched or unlatched when backing a dolly under the second trailer? C 10. 0000003261 00000 n If there are no dummy couplers, the glad hands can sometimes be locked together (depending on the couplings). Should the shut-off valves on the trailers be open or closed on a set of double trailers? If you leave this page, your progress will be lost. Ship to Store. 0000010285 00000 n what is likely to happen if the pintle hook is unlocked with the dolly still under the second trailer? When you do this, you should hear: Converter dollies: A. make things look smaller and farther away than they really are which of these figures shows how the turn should be made, if you want to couple a second trailer to your combination vehicle, secure it by, the trailers spring brakes & wheel chocks. How do you check to make sure the trailer height is correct before coupling? you want to hook your combination to a second trailer that has no spring brakes. Should I Be A Truck Driver? safe speed would be 40 MPH. The rear trailers shut off valves should be closed and the front open to allow air to the Air flows steadily and isentropically through a passage. 0000003977 00000 n Email Updates When New Articles Are Posted. Do converter dollies have spring brakes? Good speed management says you should: You must drive through deep or flowing water. Feel Free to add additional fields for the Quiz Taker to complete using the "Add Fields" options to the right. The road is dry and visibility is good. This has the same value as the %%SCORE%% Variable on the Final Screen. Describe what the trailer air supply control does. B. do not need to be checked as often as flat mirrors because they show a larger area You can test that air is flowing to all trailers by opening? A major leak in the emergency line will cause the tractor protection valve to close and the trailer emergency brakes to come on. Stop the vehicle by gearing down and sparingly When driving with more than one trailer, which trailer should be the first one behind the tractor? 2. Nothing, the weight of the trailer will keep it in place, 10. In the coupling system, the locking jaws should be fixed around? King pin. unsafe slow down even further, or better yet, find a safe haven and park until the The total number of questions. The road is dry and visibility is good. Any combination of vehicles with a gross combined weight rating (GCWR) of 26,001 or more pounds, providing the gross vehicle weight rating (GVWR) of the vehicle being towed is in excess of 10,000 pounds. When you go to the rear of the last trailer, what should you do to complete this check? When coupling twin trailers, you should _______ the pintle hook and secure the dolly support in the _______ position. to do this without wheel chocks you should: supply air to the trailer air system with the tractor and then disconnect the emergency line. [California Commercial Driver Handbook] The weight of a truck: Is a major factor affecting stopping distance. The heaviest trailer TestPermit.com provides free unofficial review materials for a variety of exams. When you do this, you should hear: you are driving with double trailer and must use your brakes to avoid a crash. 21 0 obj << /Linearized 1 /O 23 /H [ 1162 213 ] /L 29759 /E 11109 /N 7 /T 29221 >> endobj xref 21 38 0000000016 00000 n Make sure you do not get in a spot you cannot pull straight through. C. the service brakes slowly move to the fully applied position, Some large trucks have converted or "spot" mirrors. when does the drivers manual say you should disable the steering axle brakes? This has the same value as the %%TIME_ALLOWED%% Variable on the Final Screen. You will speak with recruiters today. 0000009556 00000 n Each trailer and converter dolly has one or more air tanks. In order to receive your Doubles and Triples endorsement, it is required that you pass the states official CDL written Knowledge exam. These dollies will have a yellow lamp on the left side of the dolly. 1/2 to 3/4 of an inch You want to lock your combination to a second trailer that has no spring brakes. 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 When uncoupling a rear trailer, you should remove some weight from the dolly by? A. opening the air tank petcock What is one function of the tractor protection valve? Air pressure is sent from the air tanks to the brakes by relay valves. Follow the procedures described later in this section. How many different ways of coupling and uncoupling trailer combinations are there? What is a converter dolly? A. you can steer more quickly and safely if you hold the wheel with one hand Related Question Question: What does this sign mean? At TruckingTruth we'll help you decide if trucking is right for you and help you get your career off to a great start. When testing trailer service brakes, you should use? You may not notice a major leak in the service line until you try to put the brakes on. 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. The emergency line valve open and release air You are doing a walk around inspection of a double or triple trailer rig. Open the emergency line shut-off valve at the rear of the last trailer. How do you check to make sure trailer height is correct before coupling? These valves permit closing the air lines off when another trailer is not being towed. If there is a trailer The pintle hook should always be secure when the vehicle is in motion. Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? 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? 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. You should hear air escaping, showing the entire system is charged. Allow more following distance. C. close the shut-off valves at the rear of the first trailer and open the shut-off valves at the rear of the second trailer, To check that the converter dolly is securely coupled to the rear trailer, you should: Safety should never take second place, so know your stuff! Any trailer, 7. to re-capture it. That there is no space between upper and lower sixth wheel. inspection of all equipment. None Be certain you are clear at the sides before changing lanes. 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! and the converter dolly air tank drain valve should be _____. The puzzle: At the far left edge, the plates are in contact, so the path length difference between rays 222 and 333 is zero. A C. slow to a safe speed before entering the curve, then coast through it, Which of these is NOT a good thing to do when driving on slippery roads? 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. True! They are filled by the emergency (supply) line from the tractor. Calculate the voltage gain of each. securely fastened. The last trailer in a combination is most likely to turn over. rear trailer. The braking systems of double and triple trailers are different than those of straight trucks because doubles and triples. which of these statements about managing space to the sides is true? C. use stab or controlled braking, Which of these is true? d. protein. how much space should be between the upper and lower fifth wheel? Connect the Converter Dolly to the Rear Trailer: Test the coupling by pulling against the pin of the second semitrailer. If there is Submit your email at the end of the test. Lock pintle hook. Open, latched 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. Allow much more space than is needed for ideal driving condition. You should keep at least ____ seconds of space ahead of you. Tips for Backing Up a Trailer Like a Pro Trucker. Which of the following must be connected when coupling tractor to trailer or trailer to 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. Remember: The trailer air brakes are supplied with air using the emergency line (also called the supply line). Hazardous materials must be placarded on all four sides of EACH Trailer. When you do this, you should hear: Otherwise, the dolly tow bar may fly up, possibly causing injury and making it very difficult to re-couple. A good and safe driver will always look out for ______. A 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 trailer height is right when: The trailer will be raised slightly when the converter dolly is backed under it. Calculate the Mach number at section 2. A. use light, steady pressure on the brake pedal 0000010705 00000 n - Converter dolly air tank drain valve: CLOSED. speed and start spinning again, in turn stopping your skid, All the listed answers would be correct. recouple. Pull gently against them in a low gear to make sure the brakes work. Any items you have not completed will be marked incorrect. which of these is not a good thing to do when driving on slippery roads? Opening the shut off valves on the rear most trailer will ensure the lines are flowing Connect Converter Dolly to Rear Trailer Make sure trailer brakes are locked and/or wheels chocked. Which of these is NOT a good thing to do when driving on slippery roads? Remember however, that is just a suggestion. You should look into the back of the fifth wheel on a dolly to see if it is locked onto the kingpin, A safe speed on a curve for a straight truck or a single trailer combination vehicle may be too fast for double or triple trailers. This has the same value as the %%WRONG_ANSWERS%% Variable on the Final Screen. the crack-whip effect that triubkes trucks with trailers is most likely to cause a tip over when. 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. The rear trailers shut-off valves should be closed and the front open. Refers to pulling two trailers at the same time, otherwise known as "pups" or "pup trailers" because they're only about 28 feet long. D 0000009577 00000 n 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. which of these statements about the handling of doubles and triples is true ? When checking your air lines, they must be secure and? Typically depends on the axle count. The dolly tow bar may flip up causing bodily injury and making it very difficult to 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. You are driving with more than one trailer. The shut off valves prevent air from going any further. Make sure to visually inspect the fifth wheel and that the locking mechanism is You should hear air escaping, showing the entire system is charged. Some large trucks have curved (convex or spot) mirrors. 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. 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. On a triple combination, the shutoff valves on the rear of the last trailer should be? This would be very dangerous. The dolly tow bar may fly away, possibly causing panic, and making it very difficult This has the same value as the %%PERCENTAGE%% Variable on the Final Screen. Tractor-trailers are considered combination vehicles. 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. When uncoupling a rear trailer, your rig should be parked in a straight line on? If you crossed the air lines, you could drive away, but you would not have trailer brakes. kingpin, That there is grease between upper and lower fifth wheel. 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.