the converter dolly air tank drain valve should be

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. Connect the Converter Dolly to the Rear Trailer: Test the coupling by pulling against the pin of the second semitrailer. 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? inspection of all equipment. 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. If you do, there is a problem. Take this same test in our other testing modes How to Get a Hazardous Materials Endorsement, What is a CDL? What is the most common foundation brake found on heavy vehicles? A. open the shut-off valves at the rear of both trailers A How do you know if your converter dolly is equipped with antilock brakes? Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? When pulling a single trailer with a Shut-Off Valve, the valves must be in the: Trailers built before what year may not be equipped with trailer spring brakes? Wait for air pressure to reach normal, then push in the red trailer air supply knob. 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 _____. D You need to be aware of how parking lots are arranged in order to avoid a long and difficult escape. Safety chains should be secured to trailer(s). There is more chance for skids and loss of traction. You need to brake in order to regain control. The trailer height is right when: The trailer will be raised slightly when the converter dolly is backed under it. When you do this, you should hear: X D5^4aX{Ka)nT)Ac g" endstream endobj 58 0 obj 108 endobj 23 0 obj << /Type /Page /Parent 19 0 R /Resources 24 0 R /Contents [ 31 0 R 33 0 R 35 0 R 46 0 R 48 0 R 50 0 R 52 0 R 54 0 R ] /MediaBox [ 0 0 612 792 ] /CropBox [ 0 0 612 792 ] /Rotate 0 >> endobj 24 0 obj << /ProcSet [ /PDF /Text ] /Font << /F2 37 0 R /F4 40 0 R /TT2 28 0 R /TT4 26 0 R /TT6 42 0 R /TT8 44 0 R >> /ExtGState << /GS1 55 0 R >> /ColorSpace << /Cs5 29 0 R >> >> endobj 25 0 obj << /Type /FontDescriptor /Ascent 905 /CapHeight 0 /Descent -211 /Flags 32 /FontBBox [ -222 -325 1072 1037 ] /FontName /ArialMT /ItalicAngle 0 /StemV 0 >> endobj 26 0 obj << /Type /Font /Subtype /TrueType /FirstChar 32 /LastChar 121 /Widths [ 278 0 355 0 0 0 0 191 333 333 0 0 278 333 278 278 556 556 556 556 556 556 556 556 556 556 278 0 0 0 0 556 0 667 667 722 722 667 611 778 722 278 0 667 556 833 722 778 667 0 722 667 611 722 0 944 0 667 0 0 0 0 0 0 0 556 556 500 556 556 278 556 556 222 222 500 222 833 556 556 556 556 333 500 278 556 500 722 500 500 ] /Encoding /WinAnsiEncoding /BaseFont /ArialMT /FontDescriptor 25 0 R >> endobj 27 0 obj << /Type /FontDescriptor /Ascent 905 /CapHeight 0 /Descent -211 /Flags 96 /FontBBox [ -262 -325 1082 1025 ] /FontName /Arial-ItalicMT /ItalicAngle -15 /StemV 0 >> endobj 28 0 obj << /Type /Font /Subtype /TrueType /FirstChar 32 /LastChar 118 /Widths [ 278 0 0 0 0 0 0 191 0 0 0 0 0 333 278 278 556 556 556 556 556 556 556 556 0 0 0 0 0 0 0 0 0 0 0 722 722 0 0 0 0 0 0 0 0 833 0 0 667 0 0 0 611 0 0 0 0 0 0 0 0 0 0 0 0 556 556 500 556 556 0 556 0 222 0 0 222 833 556 556 556 0 333 500 0 556 500 ] /Encoding /WinAnsiEncoding /BaseFont /Arial-ItalicMT /FontDescriptor 27 0 R >> endobj 29 0 obj [ /CalRGB << /WhitePoint [ 0.9505 1 1.089 ] /Gamma [ 2.22221 2.22221 2.22221 ] /Matrix [ 0.4124 0.2126 0.0193 0.3576 0.71519 0.1192 0.1805 0.0722 0.9505 ] >> ] endobj 30 0 obj 638 endobj 31 0 obj << /Filter /FlateDecode /Length 30 0 R >> stream Speed for other vehicles is often too fast for a multi-combination unit! 3. The lightest trailer The Verge logo. Take special care when pulling two and three trailers. To check if the converter dolly is securely coupled to the rear trailer you should: Pull gently against the pin of the second trailer. Seriously! When testing trailer service brakes, you should use? 8. A-dolly. Each trailer and converter dolly has one or more air tanks. Opening the shut off valves on the rear most trailer will ensure the lines are flowing When checking your air lines, they must be secure and? - Converter dolly air tank drain valve: CLOSED. 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. Before you can supply air to the air tanks of a second trailer you need to. Which diagram shows the best way to turn? To test the tractor protection valve, charge the trailer air brake system, turn off the engine, and The service air line is only used to control the service brakes (when you press on the brake pedal or use the trailer hand-valve). The trailer brakes will unlock Park the rear trailer against another trailer, chock the tires and lock the trailer Older trailers do not have spring brakes. Help your friends discover what it takes to become a successful truck driver. For emergency braking you should: Provides a snug fit to eliminate unwanted seepage of air or water. You are doing a walk around inspection of a double or triple trailer rig. 0000003977 00000 n All other trailer air functions use the emergency line. Be sure pintle-eye of dolly is in place in pintle hook of trailer(s). Therefor, if there is a major leak in your service line, you may not know it until you try to use the service brake. 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. You should hear air escaping, showing the entire system is charged. Please wait while the activity loads. Some vehicles have dead end or dummy couplers to which the hoses may be attached when they are not in use. Shut off valves are only used on trailers designed to be towed in conjunction with other trailers (doubles / triples). If you crossed the air lines, you could drive away, but you would not have trailer brakes. Clean the couplers and rubber seals before a connection is made. A Did you know you can fill out one quick form here on TruckingTruth and apply to several companies at once for paid CDL training? 1. A. fully lowered 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. the total stopping distance of a truck is the distance it takes to stop once the brakes are put on at any speed 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. Also, this page requires javascript. Your vehicle is so long that you must swing wide to make the turn. 0000007508 00000 n Which is most likely to tip over: In normal operation, trailer service brakes should be operated by? 0000003240 00000 n What happens if you cross the Emergency Air Line and the Service Air Line? If this activity does not load, try refreshing your browser. 1/3 For example: If you are traveling 60 MPH and it begins to rain, your suggested Calculate the Mach number at section 2. 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. Remember, the service line is not used unless you depress the brake pedal or use the trailer hand valve. For emergency braking you should: A Push the brake pedal as hard as you can and hold it there B 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. HlTo xGf`{iIMh-x||?pbE':X4ZZZRbu7 uvi_RHUkVXBVu{^B3 4e/iw\]RE] YY7i)e V*h(++WQ-]Xm9c5yU6BS" 5HiL,[b)ee:t/ )%BVGpU7T\ZJD 9 C A dolly is like a very short trailer, with a ring hitch on the front and a fifth wheel on top. 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. The application only takes one minute. The converter dolly air tank drain valve on coupled double/triple trailers should be: You are driving a 100-feet truck with double trailers at 50 mph. When driving a truck with more than one trailer, which trailer should be first behind the truck? the trailer height is right when: the trailer will be raised slightly when the converter dolly is backed under it. You open the emergency line shut-off valve at the rear of the last trailer and hear air escaping. B. you should avoid traveling next to others whenever possible Correct answer percentage. what is likely to happen if the pintle hook is unlocked with the dolly still under the second trailer? Air escape from the open valve You are driving with double trailers and must use your brakes to avoid a crash. You must steer gently when pulling trailers. Each trailer and converter dolly has one or more air tanks. Doubles and triples are extremely prone to control issues and must be you are driving a set of doubles and a set of trailer wheels goes in a skid. We have a new version of this program. Doubles and triples are more likely to turn over than other combination vehicles because of what effect? To do this without wheel chocks you should: Empty trucks: When parking your double or triple combination, you should look for a parking space You should be sure the converter dolly air tank drain valves are _______ & the pintle hook is __________. Use the engine brake or speed retarder. If not, there is a problem. If spare tire is on converter gear (dolly), make sure it is secured. The road is dry and visibility is good. By clicking the ["Send"] button, you agree to our Terms of Use and Privacy Policy, and to the use of cookies described therein, and you also consent to the collection, storage, and processing of your data in the United States where the level of data protection may be different from that in your country. Try our free CDL Doubles and Triples Test Question and Answers Quiz online. 0000008915 00000 n A. brake and downshift in a curve How do you check to make sure the trailer height is correct before coupling? What is a converter dolly? Make sure you have large enough gaps before entering or crossing traffic. You will have greater length and more dead axles to pull with your drive axles than other drivers. d. protein. D There are two types of converter dollies. When entering a roundabout, a driver must yield the right-of-way to drivers already in the roundabout and obey all traffic signs. It's a fifth wheel, not a sixth wheel. Be more careful in adverse conditions. Study section 6.2 if you can't answer all of these questions. 0000003060 00000 n If the dolly is a two axle unit then 1 You can reset the test and retake it as needed. Which of these is the correct answer? Slow to the safe speed before entering, then accelerate slightly through the curve. Their drawbars differentiate them. This has the same value as the %%TOTAL%% Variable on the Final Screen. Converter dollies are connected to front trailers with a? Converter dolly air tank drain valve: CLOSED. If you feel behind the shut-off valve then they need to remain open. How much space should be between the upper and lower fifth wheel? Be certain you are clear at the sides before changing lanes. 0000001775 00000 n 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. This has the same value as the %%SCORE%% Variable on the Final Screen. What does the Driver's manual say about how much space you should keep ahead of your truck? Double and triple trailers increase not only the operators risk of safety, but also the other motorists around him. If it goes low enough, the trailer emergency brakes will come on. You should keep at least ____ seconds of space ahead of you. CDL License Requirements State By State. C 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 dolly tow bar may fly up, possibly causing injury, and making it very difficult to unsafe slow down even further, or better yet, find a safe haven and park until the and the converter dolly air tank drain valve should be _____. When coupling twin trailers, you should _______ the pintle hook and secure the dolly support in the _______ position. C. closed; unlatched, Which of these will result in the best control on a curve? That there is no space between upper and lower sixth wheel. The crack the whip effect will topple the rear trailer first. Often do not have spring brakes B. are the easiest to stop since there is no shifting cargo How do you know if your converter dolly is equipped with antilock brakes? Why is there still destructive interference? 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. When only pulling one trailer, be sure the shut-off valves are all in the fully closed position. Go to the rear of the rig. You will not be tested on uncoupling twins unless you want to get a double/triple trailer endorsement on your license. A Pull gently against the pin of the second trailer. kingpin. If one air system is very low on pressure _______. What happens when there is a major leak in the emergency air line? Lock pintle hook. Go to Section 4: Other Topics This question is in Section 4: Other Topics of our CDL Test Guide. This will prevent water and dirt from getting into the coupler and the air lines. View the full article to see how to set cruise control correctly! 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. Doubles and triples are more likely to turn over than other combination vehicles because of the "crack- the-whip" effect. 4. You are doing a walk around inspection of a double or triple trailer rig. 2. Closed, free, 8. When checking the coupling system, make sure that the locking jaws are around the shank of the. A full trailer behind a truck Once you have coupled your rear trailer, you should test the coupling by? The heavier trailer should be in the rear. Blue is used for the service lines, and red for the emergency (supply) lines. A. opening the air tank petcock Safety fail-safe features of a tractor-trailer converter dolly. 1 You should keep at least _____ seconds of space ahead of you. 10. Time limit varies by state. 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: 0000002636 00000 n The last trailer in a combination is most likely to turn over. 0000001162 00000 n 0000008894 00000 n TestPermit.com provides free unofficial review materials for a variety of exams. you should avoid traveling next to others when possible. What three methods can you use to secure a second trailer before coupling? These mirrors: make things seem smaller & further away then they really are. For emergency braking you should: You are doing a walk around inspection of a double or triple trailer rig. You should be sure the converter dolly air tank drain valves are _____ and the pintle hook is _____. how can you be sure you supplied air to a second trailer? Converter dolly air tank drain valve: CLOSED. A B. you need about four times as much stopping distance at 40 mph as at 20 mph The A-dolly has a single drawbar with a single, centered hitching point. Make sure the converter dolly air tank drain valve is closed. when does the drivers manual say you should disable the steering axle brakes? When driving with more than one trailer, which trailer should be the first one behind the tractor? some large trucks have curved (convex or spot) mirrors. B. you can almost always stop more quickly than you can turn 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 dolly will have a yellow lamp on the drivers (left) side. The road is dry and the visibility is good. What should you check for when inspecting a converter dolly? Make a sketch that explains this phenomenon in terms of a feedback loop . The lighter trailer should be in the rear. the crack-whip effect that triubkes trucks with trailers is most likely to cause a tip over when. 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. go to the rear of the second trailer and open the emergency line shut off, before you can supply air to the air tanks of the second trailer you need too, open the shut-off valves at the rear of the first trailer & close the shut-off valves at the rear of the second trailer. 6. 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. NPT thumbscrew style design enables easy installation. If you have traffic on both sides of your vehicle and something is blocking your lane, a move to the right still be best. For emergency braking you should: Use controlled or stab braking Converter dollies: Often do not have spring brakes The crack the whip effect that troubles trucks with trailers. Those that do not have spring brakes have emergency brakes that work from the air stored in the trailer air tank. . C 2) the second test is to go out to the trailer to ensure that the parking brakes have indeed applied. 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 There is no obligation whatsoever. D When you do this, you should hear: A Open. The service brakes slowly move to the fully applied position How can you test that air flows to all trailers? The road is dry and the visibility is good. You shouldn't stop braking. A good and safe driver will always look out for ______. There is no requirement or exact standard for color coding. Also available in App Store & Google Play. Delivering to. Air flows steadily and isentropically through a passage. The coupling between a rear trailer and a dolly should have a space between the upper and lower fifth wheels of? Air Storage and Drain Tanks: Air storage tanks are used to hold compressed air. 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 good speed management says you should, may have poor traction due to bouncing and wheel lock up. C What is a converter dolly? Pull gently against them in a low gear to make sure the brakes work. Which of these are the correct positions for shut-off valves in doubles and triples? . B. closed You will speak with recruiters today. 1. When the road is slippery You want to lock your combination to a second trailer that has no spring brakes. 4. Which of the following is true about loading cargo into double or triple trailers? How can you be sure you supplied air to a second trailer? Definition. Which of the following must be connected when coupling tractor to trailer or trailer to trailer? The total number of questions. utilize the brakes. 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. Slow to the safe speed before entering, then accelerate slightly through the curve. A. air escape from the open valve B 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. Hook dolly to front trailer. You are visually checking the coupling of a converter dolly to the rear trailer. the rig will continue moving in a straight line no matter how much the steering wheel is turned. Should the shut off valves on the rear of the first trailer be open or closed on a set of double trailers? There are more things that can go wrong, and doubles/triples are less stable than other commercial vehicles. Question 4. In a certain electronic device, a three-stage amplifier is desired, whose overall voltage gain is 42 dB. Only trailers designed to be pulled with another trailer behind it will have a shut off valve. fifth wheel, so trailer is raised slightly when dolly is pushed under it. These valves permit closing the air lines off when another trailer is not being towed. Newer trailers have spring brakes just like trucks and truck tractors. C. the service brakes slowly move to the fully applied position, Some large trucks have converted or "spot" mirrors. You are driving a tractor with multiple trailers. Dont hesitate to take advantage of our practice tests in each category specific to your needs. This is CDL Doubles and Triples Test 3in our original Classic Mode. Driving doubles/triples is also more dangerous in hot and cold weather driving, as well as on mountain roads. Pintle hook latched. Therefore, it is very important for safety that you use wheel chocks when you park trailers without spring brakes. B. the emergency line valve open and release air A low air buzzer will go off indicating something is wrong and either the front or the You may not notice a major leak in the service line until you try to put the brakes on. "Glad hands" are coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer. The road is dry and visibility is good. 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. For emergency braking you should: Make sure pintle hook is latched. Open the shut-off valves at the rear of the last trailer and listen for air flow. allow "much more space than is needed for ideal driving conditions". 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. All material on this website is copyrighted. Explore now! D To help avoid mistakes, colors are sometimes used. you are visually checking the coupling of a converter dolly to the rear trailer. What will happen if there is a major leak in the service air line? This has the same value as the %%PERCENTAGE%% Variable on the Final Screen. Connect the Converter Dolly to the Rear Trailer: Test the coupling by pulling against the pin of the second semitrailer. That there is some space between the upper and lower fifth wheel. Good speed management says you should: You must drive through deep or flowing water. 7. What should you check for when inspecting the converter dolly and the pintle hook? air throughout the system. What do you check when making a visual check of coupling? You can test that air is flowing to all trailers by opening? Use controlled or stab braking The converter dolly air tank drain valve on coupled double and triple trailers should be: A. open B. closed C. partially opened B When inspecting coupled doubles and triples, make sure the pintle hooks are: A. secured to the safety pins B. in the open position C. latched C Which of these is true? Antilock Braking Systems on Converter Dollies, Converter dollies built on or after March 1, 1998, are required to have antilock brakes. You should keep at least ____ seconds of space ahead of you. Visually check to make sure that the lead trailer is slightly higher than the center of B How do you check to make sure trailer height is correct before coupling? Release Dolly breaks by opening the air tank petcock or if the dolly has a spring break, use the Dolly parking brake control . How do you check to make sure trailer height is correct before coupling? Page 7-6 Commercial Driver's Manual/2.0 = Be sure air lines are supported and glad hands are properly connected.