A. countersteer You should hear air escaping, showing the entire system is charged. In order to supply air to the air tanks of a second trailer, you must ______ shut-off valves at the rear of the first trailer and ________ the shut-off valves at the rear of the second trailer. View More Details. How can you test that air flows to all trailers? Feel Free to add additional fields for the Quiz Taker to complete using the "Add Fields" options to the right. They are filled by the emergency (supply) line from the tractor. How do you check to make sure the trailer height is correct before coupling? you should keep atleast __seconds of space ahead of you. We are here to help. 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. Which of the following must be connected when coupling tractor to trailer or trailer to trailer? When coupling twin trailers, you should _______ the pintle hook and secure the dolly support in the _______ position. Make sure you do not get in a spot you cannot pull straight through. 9 B. you need about four times as much stopping distance at 40 mph as at 20 mph You need to brake in order to regain control. Any trailer with a reduced ground clearance You should avoid traveling next to others when possible. Connect Converter Dolly to Front Trailer Back first semitrailer into position in front of dolly tongue. 0000005554 00000 n C Any vehicle required by federal regulations to be placarded while transporting hazardous materials. If spare tire is on converter gear (dolly), make sure it is secured. You are visually checking the coupling of a converter dolly to the rear trailer. unsafe slow down even further, or better yet, find a safe haven and park until the Sketch the shape of the passage between sections 1 and 2. You need to be aware of how parking lots are arranged in order to avoid a long and difficult escape. Open. Open the emergency line shut-off valve at the rear of the last trailer. Finsbury Pump Systems 400l (Single Stage) 5.5hp Honda Gx Petrol Engine Try our free CDL Doubles and Triples Test Question and Answers Quiz online. when does the drivers manual say you should disable the steering axle brakes? Stay up to date on truck driving industry news. and the converter dolly air tank drain valve should be _____. B. you should avoid traveling next to others whenever possible There are more things that can go wrong, and doubles/triples are less stable than other commercial vehicles. What is a converter dolly? 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. re-couple, You can if you want to, it does not matter. when driving a truck with more than one trailer, which trailer should be first behind the truck? Doubles and triples are extremely prone to control issues and must be 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. These trailers have no parking brake. 0000005664 00000 n speed and start spinning again, in turn stopping your skid, All the listed answers would be correct. True! You are doing a walkaround inspection of a double or triple trailer rig. When the road is slippery You can also reach us at (888) 830-2326. 2. C. use stab or controlled braking, Which of these is true? Which of these statements about quick steering movements and doubles/triples is true? Take special care when pulling two and three trailers. 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! To prevent trailers from rolling over, you must steer gently and go slowly around corners, on ramps, off ramps and curves. 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 What types of trailers can get stuck on raised crossings? retrovirus $_____________________________$. If you crossed the air lines, you could drive away, but you would not have trailer brakes. Which of the following is true about loading cargo into double or triple trailers? There is no obligation whatsoever. If you feel Question 4. How do you know if your converter dolly is equipped with antilock brakes? 2023 WV Doubles - Triples CDL Practice Test 1 - CristCDL.com There is more chance for skids and loss of traction. 0000008915 00000 n coupled to the rear of a tractor-trailer combination forming a double bottom rig, A coupling device of one or two axles and a sixth wheel by which a semitrailer can be 0000007508 00000 n What three methods can you use to secure a second trailer before coupling? A Make sure pintle hook is latched. More driving knowledge, questions and answers, online practice tests for obtaining a drivers . 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 entering a roundabout, a driver must yield the right-of-way to drivers already in the roundabout and obey all traffic signs. The shut off valves prevent air from going any further. When you are pulling trailers, which of the following statements is true about steering? If the converter dolly is close to your semitrailer, you should wheel it into position? Which of the following will occur? You should be sure the converter dolly air tank drain valves are _____ and the pintle hook is _____. Allow more following distance. 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: dress gifs. 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: 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. This would be very dangerous. 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? C The emergency brakes come on whenever air pressure in the emergency line is lost. allow "much more space than is needed for ideal driving conditions". A. make things look smaller and farther away than they really are Visually check to make sure that the rear trailer is slightly lower than the center of the 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. How can you be sure you supplied air to a second trailer? 0000009556 00000 n The dolly tow bar may fly away, possibly causing panic, and making it very difficult the crack-whip effect that triubkes trucks with trailers is most likely to cause a tip over when. should remain in the closed position. Hb```f``b`c``e@ (Q6_* Trailer Parts Superstore - How Air Brakes Work - Eastern Marine C. posted speed limits on curves are safe for all trucks, Empty trucks: B. restore traction to the tires Take special care when pulling two and three 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 reduce your speed by about _____ on a wet road. D Close the emergency line shut-off valve at the rear of the trailer. B For emergency braking you should: 6. 2022 DE Doubles - Triples CDL Quick Review 1 - CristCDL.com It is very important to keep the air supply clean. Once that's complete, then its an easy push back and the 0000010705 00000 n How should you test the coupling? You must treat a flashing red signal as you would treat a STOP sign. The dolly will have a yellow lamp on the drivers (left) side. These valves permit closing the air lines off when another trailer is not being towed. Study section 6.2 if you can't answer all of these questions. Air flows steadily and isentropically through a passage. Doubles and triples are more likely to turn over than other combination vehicles because of what effect? By clicking on "Sign Up", you agree to our Terms of Use and Privacy Policy. 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. The converter dolly air tank drain valve on coupled double/triple trailers should be: Answer: Closed. Ensuring the safety of the public starts with a thorough 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. You must steer gently when pulling trailers. By using this site, you agree to be bound by our Terms of Use, Privacy Policy and Cookie Policy, Copyright 2000-2023 MH Sub I, LLC dba Internet Brands. ADVERTISEMENT ADVERTISEMENT door. When connecting a converter dolly to a rear trailer, the trailer height must be adjusted so that it is? Double and Triples Endorsement Flashcards Submit your email at the end of the test. how much space should be between the upper and lower fifth wheel? You should keep at least _____ seconds of space ahead of you. 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: For emergency braking you should: A Push the brake pedal as hard as you can and hold it there B Be certain you are clear at the sides before changing lanes. True! True! 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. How should the converter dolly air tank drain valve on coupled double A. release the spring brakes and check for movement The road is dry and visibility is good. Which of these statements about managing space to the sides is true? Go to the rear of second trailer and open the emergency line shut-of valve. 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. Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? 2 Seriously! What does the Commercial Driver Handbook say about how much space you should keep ahead of your truck? What three methods can you use to secure a second trailer before coupling? you are doing a walkaround inspection of a double or triple trailer rig. Your vehicle is so long that you must swing wide to make the turn. When driving with more than one trailer, which trailer should be the first one behind the tractor? For emergency braking you should: May have poor traction due to bouncing and wheels lockup. You are driving a triple trailer and there is a loss of air pressure in the emergency line. They provide the air pressure used to operate trailer brakes. A) closed . C. back up slightly and make a visual check of the coupling, You are driving with double trailers and must use your brakes to avoid a crash. Calculate the voltage gain of each. A Doubles/Triples Air Brake Check - digital.ncdcr.gov What is likely to happen? On a triple combination, the shutoff valves on the rear of the last trailer should be? Email Updates When New Articles Are Posted. NPT thumbscrew style design enables easy installation. Make sure you have large enough gaps before entering or crossing traffic. Ideal for replacing a worn, leaky drain valve on a compressor. Their drawbars differentiate them. Newer trailers have spring brakes just like trucks and truck tractors. coupled to the rear of a tractor-trailer combination forming a double bottom rig, Careful of the wording! 2003-2023 Chegg Inc. All rights reserved. A good and safe driver will always look out for ______. They are not only longer, but also need more space because they cannot be turned or stopped suddenly. When does the "driver's manual" advise disconnecting the steering axle brakes to help keep the rig straight? will have a lamp on the drivers side. A. opening the air tank petcock 0000003998 00000 n [California Commercial Driver Handbook] The weight of a truck: Is a major factor affecting stopping distance. What is a converter dolly? | Samsara 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 C Release Dolly breaks by opening the air tank petcock or if the dolly has a spring break, use the Dolly parking brake control . The final procedure when connecting a rear trailer is to? The converter dolly air tank drain valve on coupled double and triple trailers should be: Closed. d. protein. and ensuring it is secure. Did you know you can fill out one quick form here on TruckingTruth and apply to several companies at once for paid CDL training? 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. In order to receive your Doubles and Triples endorsement, it is required that you pass the state's official CDL written Knowledge exam. You are doing a walk around inspection of a double or triple trailer rig. This will let the rear wheels roll again and keep the rear wheels from sliding. Use the engine brake or speed retarder. New! Which of these is the correct answer? A Open, latched B Open, free C Closed, latched D Closed, free 28. D Amazon.com: Air Tank Drain Valve your vehicle is so long that you must swing wide to make a turn. Should the shut off valves on the rear of the first trailer be open or closed on a set of double trailers? Should the converter dolly air-tank drain valve be open or closed on a double trailer combination? how can you be sure you supplied air to a second trailer? 0000009577 00000 n what is likely to happen if the pintle hook is unlocked with the dolly still under the second trailer? C Which trailer should come first behind the tractor? 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. Safety fail-safe features of a tractor-trailer converter dolly. doubles/triples flip flop over from quick steering movements more easily than many other vehicles. C. 3, You are doing a walk around inspection of a double or triple trailer rig. Sometimes, metal tags are attached to the lines with the words service and emergency stamped on them. B. you can almost always stop more quickly than you can turn 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. Doubles and triples must be driven very smoothly to avoid rollover or jackknife. Some vehicles have dead end or dummy couplers to which the hoses may be attached when they are not in use. A CDL is required to drive any of the following vehicles: A vehicle with two separate parts - the power unit (tractor) and the trailer. Which is most likely to tip over: [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]. When uncoupling doubles or triples, what is important to know about unlocking the pintle hook? [California Commercial Driver Handbook] The weight of a truck: Is a major factor affecting stopping distance. How do you check to make sure trailer height is correct before coupling? A converter dolly is still under the second trailer when you unlock the pintle hook. A vehicle transporting hazardous materials is required to display placards where? Air will not be available to release the trailer spring brakes (parking brakes). to do this without wheel chocks you should: supply air to the trailer air system with the tractor and then disconnect the emergency line. Connect the Converter Dolly to the Rear Trailer: Test the coupling by pulling against the pin of the second semitrailer. What is the most common foundation brake found on heavy vehicles? Any trailer, 7. Types of converter dollies. In bad weather, slippery conditions and mountain driving, you must be especially careful if you drive double and triple bottoms. 5. You are driving a 100-feet truck with double trailers at 50 mph. 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. CDL: Doubles/Triples Flashcards | Quizlet In a certain electronic device, a three-stage amplifier is desired, whose overall voltage gain is 42 dB. 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. Which of these are the correct positions for shut-off valves in doubles and triples? B. slightly raised Please wait while the activity loads. B. pull gently against the pin of the second semitrailer Some areas of concern are discussed below. The dolly tow bar may fly up Take this same test in our other testing modes How to Get a Hazardous Materials Endorsement, What is a CDL? fumoto drain valve. Time allowed (Requires timer add on). Opening the shut off valves on the rear most trailer will ensure the lines are flowing You should be sure the converter dolly air tank drain . 0000006836 00000 n 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 rear trailers shut off valves should be closed and the front open to allow air to the Correct answer percentage. The trailer is at the correct height when. Typically depends on the axle count. Slow to the safe speed before entering, then accelerate slightly through the curve. Should the pintle hook be latched or unlatched when backing a dolly under the second trailer? B. The last trailer in a combination is most likely to turn over. C. closed; unlatched, Which of these will result in the best control on a curve? You are doing a walk around inspection of a double or triple trailer Open the emergency line shut-off valve at the rear of the last trailer. Like a trailer, a dolly equipped with ABS will have a yellow indicator light on the left side. kingpin. C. foot pedal, Which of these statements about managing space to the sides is true? What three methods can you use to secure a second trailer before coupling? None of the above, 5. C. engaging the tractor valve protection control, You must drive through deep or flowing water. You should keep at least ____ seconds of space ahead of you. Calculate the Mach number at section 2. If you do, there is a problem. These mirrors: Make things seem smaller and further away than they really are. Safety chains should be secured to trailer(s). Doubles and triples are more likely to turn over than other combination vehicles because of the "crack- the-whip" effect. _______ should be tested with the hand valve but controlled in normal operation with the foot pedal. When connecting two trailers the converter dolly is connected to the rear trailer first. Which of these is NOT a good thing to do when driving on slippery roads? Double/Triple Flashcards | Quizlet When you do this, you should hear: For emergency braking you should: Trucks with trailers have a dangerous crack-the-whip effect. Make sure the converter dolly air tank drain valve is closed. The service brakes slowly move to the fully applied position utilize the brakes. B. the emergency line valve open and release air These mirrors: make things seem smaller & further away then they really are. Trailer Air Tanks And Shutoff Valves - TruckingTruth Safety chains secured to trailer (s). You should hear air escaping, showing the entire system is charged. you want to hook your combination to a second trailer that has no spring brakes. 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? What should you check for when inspecting the converter dolly? which of these is not a good thing to do when driving on slippery roads? Safety should never take second place, so know your stuff! Go to Section 4: Other Topics This question is in Section 4: Other Topics of our CDL Test Guide. What should you check for when inspecting a converter dolly? The emergency brakes come on whenever the air supply knob is pulled out or the trailer is disconnected. 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. 2) the second test is to go out to the trailer to ensure that the parking brakes have indeed applied. Dont hesitate to take advantage of our practice tests in each category specific to your needs. These mirrors: DOUBLE/TRIPLE CDL Flashcards | Chegg.com The rear trailer does not have shut-off valves. Wait for air pressure to reach normal, then push in the red trailer air supply knob. good speed management says you should, may have poor traction due to bouncing and wheel lock up. Park on level ground, put chock on the tires, and charge the air tank. The trailer height is right when: The trailer will be raised slightly when the converter dolly is backed under it. The trailer brakes will unlock D Good speed management says you should: You must drive through deep or flowing water. Any time you have to You will have greater length and more dead axles to pull with your drive axles than other drivers. Each trailer and converter dolly has one or more air tanks. When you do this, you should hear: Which of these statements about emergency steering is true? weather passes. C. add "one car length for every 10 mph", Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer, Incidental Motions & Motions that Bring a Que. How much space should be between the upper and lower fifth wheels? 0000003977 00000 n A