All rights reserved Site Map. The pintle hook? ), a 15 year truck driving veteran, in January 2007. 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 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. C How do you check to make sure the trailer height is correct before coupling? 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 _____. The driver must yield the right-of-way to other vehicles when merging and when entering a highway from an alley. Pickup at South Loop. c. iron A. allow "much more space" than is needed for ideal driving conditions which of these statements about the handling of doubles and triples is true ? With the red knob pushed in on the tractor dash, the service line should have air in it. CDL License Requirements State By State. Doubles and triples take up more space than other commercial vehicles. Time limit varies by state. 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. Which of these are the correct positions for shut-off valves in doubles and triples? The road is dry and visibility is good. Locking jaws open For emergency braking you should: 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 number of correct answers. True! You will speak with recruiters today. What's a converter dolly? You should be sure the converter dolly air tank drain valves are _______ and the pintle hook is _____. This has the same value as the %%TIME_ALLOWED%% Variable on the Final Screen. Release Dolly breaks by opening the air tank petcock or if the dolly has a spring break, use the Dolly parking brake control . Use the dummy couplers when the air lines are not connected to a trailer. some large trucks have curved (convex or spot) mirrors. How can you be sure you supplied air to a second trailer? The A-dolly has a single drawbar with a single, centered hitching point. 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? The shortest trailer Remember, the service line is not used unless you depress the brake pedal or use the trailer hand valve. This has the same value as the %%PERCENTAGE%% Variable on the Final Screen. 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! Mar 2 - Mar 3. 0000006195 00000 n When coupling twin trailers, you should _______ the pintle hook and secure the dolly support in the _______ position. retrovirus $_____________________________$. Before you can supply air to the air tanks of a second trailer you need to. What is a converter dolly? A Closed, latched They are filled by the emergency (supply) line from the tractor. What do you check when making a visual check of coupling? They provide the air pressure used to operate trailer brakes. Take special care when pulling two and three trailers. D A The shut off valves, when in the open position, allows air to flow out to another trailer. 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. What is the most common foundation brake found on heavy vehicles? The word part ferrit- means: Learn more and apply here: TruckingTruth was founded by Brett Aquila (that's me! Safety chains secured to trailer (s). You have not finished your quiz. You should NOT: C. closed, You can release the dolly brakes by: C. posted speed limits on curves are safe for all trucks, Empty trucks: If you do, there is a problem. In the coupling system, the locking jaws should be fixed around? Once that's complete, then its an easy push back and the When driving doubles or triples how should they be driven to avoid rollover or jackknifing: 0000003998 00000 n More driving knowledge, questions and answers, online practice tests for obtaining a drivers . Once you have coupled your rear trailer, you should test the coupling by? High Road 2.0! 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. You should be sure the converter dolly air tank drain . Never unlock the pintle hook with the dolly still under the rear trailer. For emergency braking you should: A Push the brake pedal as hard as you can and hold it there B You should keep at least _____ seconds of space ahead of you. We have a new version of this program. if you have traffic on both sides of your vehicle and something is blocking your lane, a move to the right still be best. 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. You are doing a walk around inspection of a double or triple trailer rig. Make sure you can hear air escaping with the valve closed. The couplers have a rubber seal that prevents air from escaping. The tanks will hold enough air to allow the brakes to be used several times even if the compressor stops working. Air will not be available to release the trailer spring brakes (parking brakes). C C Closed, free, 8. When you do this, you should hear: Which of these statements about emergency steering is true? You should check the height of the trailer before connecting a converter dolly to a second or third trailer. For emergency braking you should: You are doing a walk around inspection of a double or triple trailer rig. D should remain in the closed position. C. the service brakes slowly move to the fully applied position, Some large trucks have converted or "spot" mirrors. Remember: The trailer air brakes are supplied with air using the emergency line (also called the supply line). 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: There is no requirement or exact standard for color coding. - Converter dolly air tank drain valve: CLOSED. Which is most likely to tip over: Always unlock the pintle hook with the dolly still under the rear trailer. 0000007032 00000 n They are filled by the emergency (supply) line from the tractor. B B safe speed would be 40 MPH. None of the above, 5. CDL Doubles and Triples Test Question and Answers 2023 [PDF]: Commercial Drivers License Doubles and Triples Endorsements Knowledge Test. It is important not to let water and oil build up in the air tanks. How do you check to make sure trailer height is correct before coupling? 0000010285 00000 n To do this without wheel chocks you should: Empty trucks: When parking your double or triple combination, you should look for a parking space 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. 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: Air escape from the open valve What does the Commercial Driver Handbook say about how much space you should keep ahead of your truck? If the dolly is a two axle unit then 1 On the middle trailer of a set of triples? C. closed; unlatched, Which of these will result in the best control on a curve? Safety should never take second place, so know your stuff! 6. The application only takes one minute. 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. How much space should be between the upper and lower fifth wheel? View the full article to see how to set cruise control correctly! B Hit the article to see the way to back up your trailer like a pro! You are driving a 100-feet truck with double trailers at 50 mph. speed and start spinning again, in turn stopping your skid, All the listed answers would be correct. Refers to pulling two trailers at the same time, otherwise known as "pups" or "pup trailers" because they're only about 28 feet long. A. always keep your vehicle to the right side of your lane You should NOT: You are driving a set of doubles and a set of trailer wheels goes into a skid. To do this without wheel chocks you should: When uncoupling the rear semitrailer, you should lower the converter dolly landing gear: When driving a double or triple, you need more space because they: Which of these statements about emergency steering is true? C 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. Why is there still destructive interference? 0000008915 00000 n True! This has the same value as the %%WRONG_ANSWERS%% Variable on the Final Screen. There are more things that can go wrong, and doubles/triples are less stable than other commercial vehicles. Use the engine brake or speed retarder. That split second that you release the brakes will allow them to match the vehicles road Hb```f``b`c``e@ (Q6_* In order to receive your Doubles and Triples endorsement, it is required that you pass the state's official CDL written Knowledge exam. To check that the trailer emergency brakes are working properly, you should pull out the trailer air supply control and? The road is dry and visibility is good. Any trailer, 7. Light cords firmly in sockets on trailer. d. protein. 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. Use controlled or stab braking Air pressure is sent from the air tanks to the brakes by relay valves. Park the rear trailer against another trailer, chock the tires and lock the trailer Feel Free to add additional fields for the Quiz Taker to complete using the "Add Fields" options to the right. When connecting two trailers the converter dolly is connected to the rear trailer first. A) closed . you are driving a set of doubles and a set of trailer wheels goes in a skid. 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. They are filled by the emergency (supply) line from the tractor. B. open; latched Go to the rear of the rig. slow to safe speed before entering, then accelerate slightly through the curve. Otherwise, the dolly tow bar may fly up, possibly causing injury and making it very difficult to re-couple. Open the emergency line shut-off valve at the rear of the last trailer. a. blood Each trailer and converter dolly has one or more air tanks. The rear trailers shut off valves should be closed and the front open to allow air to the A. completely open 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? Doubles and triples are more likely to turn over than other combination vehicles because of the "crack- the-whip" effect. None The pressure in the service line is controlled by the brake pedal and the trailer hand brake. When uncoupling a rear trailer, you should remove some weight from the dolly by? 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 can also reach us at (888) 830-2326. 1 Some large trucks have curved (convex or spot) mirrors. However there are some states that allow doubles that are each 48 feet in length. Terms in this set (43) Converter dollies are used to connect: A tractor-trailer combination to another trailer. Should the converter dolly air-tank drain valve be open or closed on a double trailer combination? You wish to turn right from one two-lane, two-way street to another. A connection device of one axle used to disconnect a semitrailer combination vehicle Charge the system and pump the brakes with the window down. Question 4. You should avoid traveling next to others when possible. You need to brake in order to regain control. B. you should avoid traveling next to others whenever possible TestPermit.com provides free unofficial review materials for a variety of exams. You will have greater length and more dead axles to pull with your drive axles than other drivers. and possible answers include: open, free or closed, latched or closed, free or open, latched from TruckersDouble & Triple Trailer (CDL) Endorsement. and the converter dolly air tank drain valve should be _____. B. the emergency line valve open and release air These mirrors: make things seem smaller & further away then they really are. You should hear air escaping, showing the entire system is charged. axle will have spring brakes due to the weight of the unit. _______ should be tested with the hand valve but controlled in normal operation with the foot pedal. A converter dolly is a piece of equipment designed to allow commercial trucks, such as semi-trucks, to pull a trailer. 1. fifth wheel, so trailer is raised slightly when dolly is pushed under it. Flammable materials in the front trailer then it must have the placards on that trailer. B. you can almost always stop more quickly than you can turn Locking jaws closed on front of the second trailer. B Simply click in your answer to each CDL practice test question. Any vehicle, regardless of size, designed to transport 16 or more persons, including the driver. You may be timed. which of these is not a good thing to do when driving on slippery roads? Should the shut-off valves on the rear of the last trailer be open or closed? Which f these will result in the best control on curves? door. Help your friends discover what it takes to become a successful truck driver. 0000001375 00000 n Open the shut-off valves at the rear of the last trailer and listen for air flow. A green traffic light allows the driver to go. You may not notice a major leak in the service line until you try to put the brakes on. Converter dollies are connected to front trailers with a? A sudden movement with the steering wheel can result in a tipping over rear trailer. will have a lamp on the drivers side. Which of these is most likely too occur? On the first trailer in a set of doubles? 60607. Ensuring the safety of the public starts with a thorough Make sure you have large enough gaps before entering or crossing traffic. Converter dolly air tank drain valve: CLOSED. to re-capture it. A dolly is like a very short trailer, with a ring hitch on the front and a fifth wheel on top. coupled to the rear of a tractor-trailer combination forming a double bottom rig, Careful of the wording! Make sure you do not get in a spot you cannot pull straight through. Some vehicles have dead end or dummy couplers to which the hoses may be attached when they are not in use. Make sure pintle hook is latched. A. use light, steady pressure on the brake pedal Either the front or the rear brakes will not work properly or fully. The air lines will rupture Speed for other vehicles is often too fast for a multi-combination unit! Then, the air loss from the leak will lower the air tank pressure quickly. This has the same value as the %%SCORE%% Variable on the Final Screen. Hit the article below to see specific information about AOBRDs! You can find it here: High Road 2.0. A. use a low gear Once you are finished, click the button below. Pull gently against them in a low gear to make sure the brakes work. By clicking on "Sign Up", you agree to our Terms of Use and Privacy Policy. If spare tire is on converter gear (dolly), make sure it is secured. If you're pulling more than one trailer, all valves should be open except the very last trailer, which should have all valves in the closed position. What happens when there is a major leak in the emergency air line? B 1/32 to 3/32 of an inch. A. the total stopping distance of a truck is the distance it takes to stop once the brakes are put on at any speed There are two types of converter dollies. A CDL is required to drive any of the following vehicles: A vehicle with two separate parts - the power unit (tractor) and the trailer. Connect Converter Dolly to Rear Trailer Make sure trailer brakes are locked and/or wheels chocked. A. King pin. This has the same value as the %%TIME_USED%% Variable on the Final Screen. how much space should be between the upper and lower fifth wheel? Doubles and triples are extremely prone to control issues and must be 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. The final procedure when connecting a rear trailer is to? The heaviest trailer Park on level ground, put chock on the tires, and charge the air tank. Allow more following distance. Any items you have not completed will be marked incorrect. Nothing, the weight of the trailer will keep it in place, 10. D Be certain you are clear at the sides before changing lanes. [California Commercial Driver Handbook] The weight of a truck: Is a major factor affecting stopping distance. The puzzle: At the far left edge, the plates are in contact, so the path length difference between rays 222 and 333 is zero. Make sure the converter dolly air tank drain valve is closed. The rear trailers shut-off valves should be open and the front closed. These dollies will have a yellow lamp on the left side of the dolly. These mirrors: Make things seem smaller and further away than they really are. For emergency braking you should: Delivering to. This has the same value as the %%TOTAL%% Variable on the Final Screen. There are more critical parts to check when you have two or three trailers. What should you check for when inspecting the converter dolly? Which of these statements about the handling of doubles and triples is true? Blue is used for the service lines, and red for the emergency (supply) lines. You should keep at least ___ seconds of space ahead of you. HlTo xGf`{iIMh-x||?pbE':X4ZZZRbu7 uvi_RHUkVXBVu{^B3 4e/iw\]RE] YY7i)e V*h(++WQ-]Xm9c5yU6BS" 5HiL,[b)ee:t/ )%BVGpU7T\ZJD You want to lock your combination to a second trailer that has no spring brakes. You should keep at least ____ seconds of space ahead of you. 1. You are driving a triple trailer and there is a loss of air pressure in the emergency line. C Which diagram shows the best way to turn? To do this without wheels chocks you should: Supply air to the trailer air system with the tractor and then disconnect the emergency line. A turn of the glad hand attached to the hose will join and lock the couplers. with the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the trailer. It depends on the load If there are no dummy couplers, the glad hands can sometimes be locked together (depending on the couplings). 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. Pull gently against the pin of the second trailer. Describe what the trailer air supply control does. You should be sure the converter dolly air tank drain valves are _____ and the pintle hook is _____. Should the shut-off valves on the trailers be open or closed on a set of double trailers? To check air flows to all trailers, you should let air pressure reach normal then? Number of wrong answers. Which of these is NOT a good thing to do when driving on slippery roads? At section 2 downstream, the speed is 519 m/s. Page 7-6 Commercial Driver's Manual/2.0 = Be sure air lines are supported and glad hands are properly connected. Push the brake pedal as hard as you can and hold it there This will prevent water and dirt from getting into the coupler and the air lines. Which of the following statements about off tracking is true? C locked . 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. B. johnson bar Compressed air usually has some water and some compressor oil in it. Try our free CDL Doubles and Triples Test Question and Answers Quiz online.
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