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What do you check when making a visual check of coupling? Pintle-eye of dolly in place in pintle hook of trailer (s). There are two types of converter dollies. Otherwise, the dolly tow bar may fly up, possibly causing injury and making it very difficult to re-couple. Terms in this set (43) Converter dollies are used to connect: A tractor-trailer combination to another trailer. A. you can steer more quickly and safely if you hold the wheel with one hand allow "much more space than is needed for ideal driving conditions". Which of these statements about managing space to the sides is true? C. closed, You can release the dolly brakes by: A CDL is required to drive any of the following vehicles: A vehicle with two separate parts - the power unit (tractor) and the trailer. When you do this, you should hear: Which of these statements about emergency steering is true? In normal operation, trailer service brakes should be operated by? A Never pull any trailer without visually inspecting the fifth wheel locking bar You are driving a triple trailer and there is a loss of air pressure in the emergency line. 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. will have a lamp on the drivers side. How should you test the coupling? Should the shut-off valves on the rear of the last trailer be open or closed? All trademarks are property of their respective owners. Closed, latched If loading fails, click here to try again. Charge the system and pump the brakes with the window down. B. releasing the pintle hook should remain in the closed position. 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. Connect Converter Dolly to Rear Trailer Make sure trailer brakes are locked and/or wheels chocked. Follow the procedures described later in this section. A. release the spring brakes and check for movement 10. D can and will get stuck on a raised railroad crossing. 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. There are more critical parts to check when you have two or three trailers. How much space should be between the upper and lower fifth wheel? What three methods can you use to secure a second trailer before coupling? We'll help you make the right choices and prepare for a great start to your trucking career. Trucks with trailers have a dangerous crack-the-whip effect. Visually check to make sure that the rear trailer is slightly lower than the center of the 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. For emergency braking you should: A Push the brake pedal as hard as you can and hold it there B On the middle trailer of a set of triples? Types of converter dollies. when driving a truck with more than one trailer, which trailer should be first behind the truck? They are filled by the emergency (supply) line from the tractor. 9 For emergency braking you should: May have poor traction due to bouncing and wheels lockup. The emergency line valve open and release air When connecting two trailers the converter dolly is connected to the rear trailer first. you should keep atleast __seconds of space ahead of you. C. always keep your vehicle to the left side of your lane, When testing the coupling of double trailers, the landing gear of the rear trailer should be: what is likely to happen if the pintle hook is unlocked with the dolly still under the second trailer? 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. Air pressure is sent from the air tanks to the brakes by relay valves. If your tractor protection valve doesn't work properly, then if an air hose starts to leak what could happen? Which of these is most likely to occur? 0000007487 00000 n Wait for air pressure to reach normal, then push in the red trailer air supply knob. B. you should avoid traveling next to others whenever possible 0000002636 00000 n The pintle hook? Opening the shut off valves on the rear most trailer will ensure the lines are flowing How do you check to make sure trailer height is correct before coupling? 0000007508 00000 n These valves permit closing the air lines off when another trailer is not being towed. Which of the following will probably happen if you are driving a double rig and a set of trailer wheels goes into a skid? With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. Once you are finished, click the button below. and ensuring it is secure. Each trailer and converter dolly has one or more air tanks. True! Which of these is the correct answer? When coupling, be sure to couple the proper glad hands together. Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? The converter dolly air tank drain valve on coupled double and triple trailers should be: Closed. To check air flows to all trailers, you should let air pressure reach normal then? 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? 4. You are visually checking the coupling of a converter dolly to the rear trailer. Open the emergency line shut-off valve at the rear of the last trailer. 2. 0000006195 00000 n B. johnson bar This has the same value as the %%PERCENTAGE%% Variable on the Final Screen. The total number of questions. B Stay up to date on truck driving industry news. Any trailer, 7. 2003-2023 Chegg Inc. All rights reserved. The front trailer in a set of double trailers is most likely to turn over due to the Crack-the-Whip effect. 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 trailer will be raised slightly when the converter dolly is backed under it 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. 0000001956 00000 n This is CDL Doubles and Triples Test 3in our original Classic Mode. behind the shut-off valve then they need to remain open. 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 should check the trailer height before connecting a converter dolly to a second or third trailer. B In an application in which vGS=vDS=Vsupply=1.8V,v_{G S}=v_{D S}=V_{\text { supply }}=1.8 \mathrm{V},vGS=vDS=Vsupply=1.8V, a drain current of 2 mA is required of a device of minimum length of 0.18m.0.18 \mu \mathrm{m}.0.18m. 0000008915 00000 n C. foot pedal, Which of these statements about managing space to the sides is true? 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. 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. The rear trailers shut off valves should be closed and the front open to allow air to the 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 The rear trailer of a double We have a new version of this program. When does the Driver's manual say you should disable the steering axle brake? C Hit the article to see the way to back up your trailer like a pro! If the air supply in the trailer air tank has leaked away, there will be no emergency brakes, and the trailer wheels will turn freely. D 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. A good and safe driver will always look out for ______. When you're finished, check your score and results. then there is a problem with the ABS system. Each tank has a drain valve on it, and you should drain each tank every day. The lighter trailer should be in the rear. Doubles and triples must be driven very smoothly to avoid rollover or jacknife. What is a converter dolly? You need to brake in order to regain control. A 0000004668 00000 n In bad weather, slippery conditions and mountain driving, you must be especially careful if you drive double and triple bottoms. 0000001582 00000 n Question 4. A low air buzzer will go off indicating something is wrong and either the front or the View the full article to see how to set cruise control correctly! Allow much more space than is needed for ideal driving condition. The road is dry and visibility is good. 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. The crack the whip effect will topple the rear trailer first. first check for battery voltage to the valve by probing the wires of the electrical connector with a volt-meter it should be about 10.5 volts if not it's probably bad.next remove the valve. Park on level ground, put chock on the tires, and charge the air tank. D Always unlock the pintle hook with the dolly still under the rear trailer. B. keep other traffic out of your side space When you do this, you should hear: Ais escape from the open valve. This has the same value as the %%TIME_USED%% Variable on the Final Screen. and possible answers include: open, free or closed, latched or closed, free or open, latched from TruckersDouble & Triple Trailer (CDL) Endorsement. You are driving a tractor with multiple trailers. Which of the following must be connected when coupling tractor to trailer or trailer to trailer? 0000006383 00000 n 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. These mirrors: make things seem smaller & further away then they really are. . The lightest trailer Open the shut-off valves at the rear of the last trailer and listen for air flow. Converter dolly air tank drain valve: CLOSED Air lines supported and glad hands properly connected. A major leak in the emergency line will cause the tractor protection valve to close and the trailer emergency brakes to come on. Those that do not have spring brakes have emergency brakes that work from the air stored in the trailer air tank. 11 If there is a trailer Because of this, which of the following vehicle parts is most likely to tip over? 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? [California Commercial Driver Handbook] The weight of a truck: Is a major factor affecting stopping distance. Before you can supply air to the air tanks of a second trailer you need to. you are driving a set of doubles and a set of trailer wheels goes in a skid. C. may have poor traction due to bouncing and wheel lockup, Before you can supply air to the air tanks of a second trailer you need to: Air escape from the open valve Seriously! mTouch Quiz will automatically populate the fields below. A converter dolly is still under the second trailer when you unlock the pintle hook. NPT thumbscrew style design enables easy installation. A Commercial Drivers License Overview, Trucking Terminology and Transportation Definitions. Which of these are the correct positions for shut-off valves in doubles and triples? 3. The shortest trailer That split second that you release the brakes will allow them to match the vehicles road The heavier trailer should be in the rear. A turn of the glad hand attached to the hose will join and lock the couplers. You should NOT: You are driving a set of doubles and a set of trailer wheels goes into a skid. on kingpin. B. slightly raised To check if the converter dolly is securely coupled to the rear trailer you should: Pull gently against the pin of the second trailer. 0000006836 00000 n Connect Converter Dolly to Front Trailer Back first semitrailer into position in front of dolly tongue. B. allow one vehicle length for every 10,000 lbs of gross vehicle weight Tractor-trailers are considered combination vehicles. The Doubles and Triples written CDL Exam is required for your doubles and triples endorsement. 2) the second test is to go out to the trailer to ensure that the parking brakes have indeed applied. C. engaging the tractor valve protection control, You must drive through deep or flowing water. 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. C. fully raised, Which of these statements about speed management and braking is true? 9. 0000003261 00000 n True! Time used (Requires timer add on). your vehicle is so long that you must swing wide to make a turn. Pull gently against the pin of the second trailer. Mar 2 - Mar 3. kingpin. The shut off valves, when in the open position, allows air to flow out to another trailer. You must steer gently when pulling trailers. What three methods can you use to secure a second trailer before coupling? When uncoupling, you should never unlock the _______ with the dolly still under the rear trailer. Connect the Converter Dolly to the Rear Trailer: Test the coupling by pulling against the pin of the second semitrailer. How can you test that air flows to all trailers? At section 1, where the cross-sectional area is 0.02 m2m^{2}m2, the air is at 40.0 kPa (abs), 60C60^{\circ} \mathrm{C}60C, and M=2.0. open, closed, closed: Term. 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. A. use the engine brake or speed retarder 3. Ideal for replacing a worn, leaky drain valve on a compressor. Number of wrong answers. Why should you not use the trailer hand valve while driving? Nothing will happen, but an in-cab warning indicator will let you know about the problem, It will cause the tractor protection valve to close and the trailer emergency brakes to come on, It will cause the tractor protection valve to open and the trailer emergency brakes to come on, When you try to put the service brakes on, air will quickly leak and will lower the air tank pressure, possibly activating the trailer emergency brakes, The emergency brakes will come on automatically as soon as a major leak occurs, Nothing, but braking power will be reduced, Air pressure will quickly leak away, even if you are not using the service brakes, Using a combination of the emergency air line and the service air line, Supply air will be sent to the service line instead of going to charge the trailer air tanks which means the trailer spring brakes will not release, Newer vehicles automatically detect if the lines are crossed and will auto-correct itself, Air will continue filling the air holding tanks until the tanks rupture from excessive pressure, Supply air will cause all brakes to release and the truck will roll freely without any braking ability, Trailers typically do not have their own air tanks, Designed to turn off the truck engine when a brake failure occurs, Used in the service and supply air lines at the back of trailers used to tow other trailers, Placed at each trailer spring brake and are designed to engage the emergency brakes when air pressure becomes too high, The yellow and red air control knobs located in the cab of a truck, Used to secure the trailer kingpin to the tractor 5th wheel, Caps which cover the valve stems on tires, A name for the yellow and red air valves in the cab of a truck, Coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer, Email Updates When New Articles Are Posted. Doubles and triples are more likely to turn over than other combination vehicles because of the "crack-the-whip" effect. C 7. 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. A-dolly. They are filled by the emergency (supply) line from the tractor. Our normal business hours are Monday-Friday 8 a.m. to 5 p.m. (Pacific Time). 0000010285 00000 n But the brakes will hold only as long as there is air pressure in the trailer air tank. Remember: The trailer air brakes are supplied with air using the emergency line (also called the supply line). You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. 1 The Verge logo. These trailers have no parking brake. If it goes low enough, the trailer emergency brakes will come on. CDL License Requirements State By State. 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. Flammable materials in the front trailer then it must have the placards on that trailer. What is a converter dolly? be coupled to the rear of a tractor-trailer combination forming a hexagon bottom rig, A coupling device of one or two axles and a fifth wheel by which a semitrailer can be The heaviest trailer A. use a low gear You need to be aware of how parking lots are arranged in order to avoid a long and difficult escape. How do you know if your converter dolly is equipped with antilock brakes? 1/2 to 3/4 of an inch Connect the Converter Dolly to the Rear Trailer: Test the coupling by pulling against the pin of the second semitrailer. This means. View More Details. 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. Safety chains secured to trailer (s). 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. If a converter dolly is still under the second trailer and you unlock the pintle hook, what will probably happen? Delivering to. 0000002446 00000 n 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. 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. Describe what the trailer air supply control does. Single axle converter dollies are the most common type of converter dolly used in the U.S. C-dolly The C-dolly has two separate couplings, side-by-side. When driving doubles or triples how should they be driven to avoid rollover or jackknifing: 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. Did you know you can fill out one quick form here on TruckingTruth and apply to several companies at once for paid CDL training? TestPermit.com provides free unofficial review materials for a variety of exams. What types of trailers can get stuck on raised crossings? Shut off valves are only used on trailers designed to be towed in conjunction with other trailers (doubles / triples). To prevent trailers from rolling over, you must steer gently and go slowly around corners, on ramps, off ramps and curves. When checking the fifth wheel, you should make sure that it has enough? You will not be tested on uncoupling twins unless you want to get a double/triple trailer endorsement on your license. A bent or damaged kingpin on a coupling should be? You will speak with recruiters today. Be more careful in adverse conditions. To uncouple the rear trailer in a set of doubles, the shut-off valve at the rear of the front trailer should be: Closed. Their drawbars differentiate them. Should I Be A Truck Driver? In the coupling system, the locking jaws should be fixed around? 1. A. require shorter stopping distances than full ones Dont hesitate to take advantage of our practice tests in each category specific to your needs. 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 Park the rear trailer against another trailer, chock the tires and lock the trailer The puzzle: At the far left edge, the plates are in contact, so the path length difference between rays 222 and 333 is zero. The converter dolly air tank drain valve on coupled double/triple trailers should be: Closed. 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 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.