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The road is dry and visibility is good. D What is most likely to happen if the trailer protection valve of a double or triple trailer does not function correctly? 7.3 Inspecting Doubles and Triples = Additional Things to Check During a Walkaround Inspection. C. foot pedal, Which of these statements about managing space to the sides is true? If a converter dolly is still under the second trailer and you unlock the pintle hook, what will probably happen? Before you can supply air to the air tanks of a second trailer you need to. You are doing a walk around inspection of a double or triple trailer rig. You should keep at least ____ seconds of space ahead of you. In this order, the shutoff valves at the rear of front trailers, the rear of the last trailer and the converter dolly air tank drain valve should be? When driving a double or triple trailer, greater care must be given to. a. blood A low air buzzer will go off indicating something is wrong and either the front or the should remain in the closed position. Some do. 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. These mirrors: Make things seem smaller and further away than they really are. You should NOT: You are driving a set of doubles and a set of trailer wheels goes into a skid. What's a converter dolly? The couplers have a rubber seal that prevents air from escaping. To uncouple the rear trailer in a set of doubles, the shut-off valve at the rear of the front trailer should be: Closed. You should be sure the converter dolly air tank drain valves are _____ and the pintle hook is ____. Which trailer should come first behind the tractor? 0000007508 00000 n Shut-off valves (also called "cut-out cocks") are used in the service and supply air lines at the back of trailers used to tow other trailers. If there is air there, then there is air towards the cab You want to hook up to the first trailer, then the converter dolly while it is lined up in Time allowed (Requires timer add on). What does the Commercial Driver Handbook say about how much space you should keep ahead of your truck? You must stop, yield to traffic and pedestrians, and only proceed when safe. All trademarks are property of their respective owners. A. brake and downshift in a curve The Doubles and Triples written CDL Exam is required for your doubles and triples endorsement. Make sure you have large enough gaps before entering or crossing traffic. That there is no space between upper and lower fifth wheel. There are more critical parts to check when you have two or three trailers. The last trailer in a combination is most likely to turn over. View the full article to see how to set cruise control correctly! The tanks will hold enough air to allow the brakes to be used several times even if the compressor stops working. Wait for air pressure to reach normal, then push in the red trailer air supply knob. axle will have spring brakes due to the weight of the unit. when testing the coupling of a double trailer the landing gears of the rear trailer should be, you must drive through deep or flowing water . Which of the following will occur? 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. B. slightly open Connect Converter Dolly to Front Trailer Back first semitrailer into position in front of dolly tongue. [California Commercial Driver Handbook] The weight of a truck: Is a major factor affecting stopping distance. When the road is dry C. use stab or controlled braking, Which of these is true? _______ should be tested with the hand valve but controlled in normal operation with the foot pedal. C You should not hear air escaping. Some areas of concern are discussed below. TestPermit.com is not affiliated, endorsed, or sponsored by state agencies or any motor vehicle and any other departments in the United States, Canada, UK. C They provide the air pressure used to operate trailer brakes. 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. Air pressure is sent from the air tanks to the brakes by relay valves. Pull gently against the pin of the second trailer. 10. B. use only the trailer brakes These dollies will have a yellow lamp on the left side of the dolly. To check that the trailer emergency brakes are working properly, you should pull out the trailer air supply control and? Which of these are the correct positions for shut-off valves in doubles and triples? A. release the spring brakes and check for movement Make sure to visually inspect the fifth wheel and that the locking mechanism is The dolly tow bar may fly up, possibly causing injury and making it very difficult to re-couple. Before coupling a trailer, you should make sure it is at the right height using? These valves permit closing the air lines off when another trailer is not being towed. %PDF-1.2 % If spare tire is on converter gear (dolly), make sure it is secured. 1. They provide the air pressure used to operate trailer brakes. - Converter dolly air tank drain valve: CLOSED. For emergency braking you should: May have poor traction due to bouncing and wheels lockup. Remember: The trailer air brakes are supplied with air using the emergency line (also called the supply line). 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. 9. C. 3, You are doing a walk around inspection of a double or triple trailer rig. To do this without wheels chocks you should: Supply air to the trailer air system with the tractor and then disconnect the emergency line. [Flashing Signals, Traffic Signals, Chapter 5 - Signals, Signs and Pavement Markings, North Carolina Driver's Handbook], One component of the DUI sentence in the state of Tennessee is twenty-four hours of litter pick-up wearing clothing that says "I am a drunk driver." You are doing a walkaround inspection of a double or triple trailer rig. What do you check when making a visual check of coupling? Did you know you can fill out one quick form here on TruckingTruth and apply to several companies at once for paid CDL training? A. use a low gear 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. 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. How much space should be between the upper and lower fifth wheels? Converter dollies have spring brakes. The puzzle: At the far left edge, the plates are in contact, so the path length difference between rays 222 and 333 is zero. Many scientists are concerned that the melting of Earth's sea ice will increase Earth's surface temperature. B. for doubles and triples, the fifth wheel should be all the way towards the tractor Then, the air loss from the leak will lower the air tank pressure quickly. For emergency braking you should: True! Slow to the safe speed before entering, then accelerate slightly through the curve. Provides a snug fit to eliminate unwanted seepage of air or water. Disconnect the glad-hand at the front of the first trailer and listen for air flow. A When coupling twin trailers, you should _______ the pintle hook and secure the dolly support in the _______ position. 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 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. A. the total stopping distance of a truck is the distance it takes to stop once the brakes are put on at any speed A) closed . 0000008894 00000 n It is important to check the height of the trailer before connecting a converter dolly to a trailer. You should NOT: 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. 0000006015 00000 n HlTo xGf`{iIMh-x||?pbE':X4ZZZRbu7 uvi_RHUkVXBVu{^B3 4e/iw\]RE] YY7i)e V*h(++WQ-]Xm9c5yU6BS" 5HiL,[b)ee:t/ )%BVGpU7T\ZJD If your converter dolly has to be moved over a distance to bring it to your semitrailer, you should? Which of the following is true about loading cargo into double or triple trailers? B. the emergency line valve open and release air Calculate the voltage gain of each. When does the "driver's manual" advise disconnecting the steering axle brakes to help keep the rig straight? You must treat a flashing red signal as you would treat a STOP sign. A dolly has lights, air tanks, air relays, air lines, air brakes, ABS, electrical connections, etc. Therefor, if there is a major leak in your service line, you may not know it until you try to use the service brake. For a particular IC-fabrication process, the transconductance parameter kn=400A/V2,k_{n}^{\prime}=400 \mu \mathrm{A} / \mathrm{V}^{2},kn=400A/V2, and Vt=0.5V.V_{t}=0.5 \mathrm{V}.Vt=0.5V. This means. The trailer is at the correct height when. utilize the brakes. There are more things that can go wrong, and doubles/triples are less stable than other commercial vehicles. We are an independent company focused on providing valuable motor vehicle and permit practice test information. d. protein. Also, this page requires javascript. The application only takes one minute. When testing the coupling of the double trailer the landing gears of the rear trailer should be: You want to hook your combination to a second trailer that has no spring brakes. Ship to Store. A dolly is like a very short trailer, with a ring hitch on the front and a fifth wheel on top. A 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 _____. What types of trailers can get stuck on raised crossings? 1/2 to 3/4 of an inch We are here to help. 0000001354 00000 n You wish to turn right from one two-lane, two-way street to another. When uncoupling doubles or triples, what is important to know about unlocking the pintle hook? Air will not be available to release the trailer spring brakes (parking brakes). "Glad hands" are coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer. The rear trailers shut-off valves should be closed and the front open. to re-capture it. If you do, there is a problem. Good speed management says you should: You must drive through deep or flowing water. Sketch the shape of the passage between sections 1 and 2. When testing trailer service brakes, you should use? 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. For emergency braking you should: You are doing a walk around inspection of a double or triple trailer rig. TestPermit.com provides free unofficial review materials for a variety of exams. When you are pulling trailers, which of the following statements is true about steering? On the first trailer in a set of doubles? to do this without wheel chocks you should: supply air to the trailer air system with the tractor and then disconnect the emergency line. C. posted speed limits on curves are safe for all trucks, Empty trucks: 0000002446 00000 n What three methods can you use to secure a second trailer before coupling? Only a certified diesel mechanic can check this. You are driving a 100-feet truck with double trailers at 30 mph. Shut off valves are only used on trailers designed to be towed in conjunction with other trailers (doubles / triples). 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: 11 During normal operation the brakes of the double/triple trailer are controlled by: B. are the easiest to stop since there is no shifting cargo Converter dolly air tank drain valve: CLOSED. Should the converter dolly air-tank drain valve be open or closed on a double trailer combination? Never pull any trailer without visually inspecting the fifth wheel locking bar 0000003240 00000 n What is the most common foundation brake found on heavy vehicles? which of these statements about managing space to the sides is true? Your vehicle is so long that you must swing wide to make the turn. securely fastened. 0000001582 00000 n 7. Watch the wording of the question AND the answers A safe driver will look for all of the above. King pin. B. johnson bar 0000003060 00000 n How do you check to make sure the trailer height is correct before coupling? A Open, latched B Open, free C Closed, latched D Closed, free 28. Pickup at South Loop. A CDL is required to drive any of the following vehicles: A vehicle with two separate parts - the power unit (tractor) and the trailer. re-couple, You can if you want to, it does not matter. You should keep at least ____ seconds of space ahead of you. C Number of wrong answers. Slow to the safe speed before entering, then accelerate slightly through the curve. 0000005733 00000 n 0000010783 00000 n You should be sure the converter dolly air tank drain . Optional: Leave your email address if you would like a reply: When inspecting doubles or triples, in what position should the air shut-off valves be in? They are filled by the emergency (supply) line from the tractor. This will let the rear wheels roll again and keep the rear wheels from sliding. The heaviest trailer C. drive through quickly, With the hand valve on, you should test the trailer brakes by opening the service valve line at the rear of the rig. D Remember however, that is just a suggestion. Shut-off valves (also called cut-out cocks) are used in the service and supply air lines at the back of trailers used to tow other trailers. the road is dry & visibility is good. What is a converter dolly? There are two types of converter dollies. Lock pintle hook. b. cell On a triple combination, the shutoff valves at the rear off the middle trailer should be? Do converter dollies have spring brakes? front of the second trailer. C. closed; unlatched, Which of these will result in the best control on a curve? Pull gently against the pin of the second trailer. 10 Learn more and apply here: The more heavily loaded semitrailer should be in first position behind the tractor. Should the shut-off valves on the trailers be open or closed on a set of double trailers? How should you test the coupling? If you do, the brakes may not work correctly. inspection of all equipment. A. allow "much more space" than is needed for ideal driving conditions If the fifth wheel on a coupling is too far forward, the tractor frame may hit? When checking the coupling system, make sure that the locking jaws are around the shank of the. You must check that all shut-off valves are in the open position except the ones at the back of the last trailer, which must be closed. When you're finished, check your score and results. which of these statements about the handling of doubles and triples is true ? A thorough pre-trip inspection should catch any major service line leaks before you begin your trip. Which of these statements about the handling of doubles and triples is true? If spare tire is carried on converter gear (dolly), make sure it's secured. C. When coupling doubles and triples, be sure that the pintle-eye of the dolly is in place in the pintle hook of the trailer, You are driving on a slippery road during the day. A converter dolly is still under the second trailer when you unlock the pintle hook. Always test the trailer brakes before driving with the hand valve or by pulling the air supply (tractor protection valve) control. 0000005554 00000 n 2. New! and ensuring it is secure. To do this without wheel chocks you should: Empty trucks: When parking your double or triple combination, you should look for a parking space 0000001375 00000 n B. slow to a safe speed before entering the curve, then accelerate slightly through it coupled to the rear of a tractor-trailer combination forming a double bottom rig, Careful of the wording! Did you know you can fill out one quick form here on TruckingTruth and apply to several companies at once for paid CDL training? Once you have coupled your rear trailer, you should test the coupling by? You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. your vehicle is so long that you must swing wide to make a turn. The rear trailers shut-off valves should be open and the front closed. That there is some space between the upper and lower fifth wheel. Submit your email at the end of the test. D 0000004668 00000 n 5. 0000008166 00000 n Simply click in your answer to each CDL practice test question. Doubles/triples flip flop over from quick steering moves more easily than many vehicles. 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 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. second trailer will be connected, The dolly will have a yellow lamp on the left side, The dolly will have a yellow lamp on the right side, The dolly will have a red lamp on the left side, The dolly will have a red lamp on the right side. You must steer gently when pulling trailers. A major leak in the emergency line will cause the tractor protection valve to close and the trailer emergency brakes to come on. [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]. Page 7-6 Commercial Driver's Manual/2.0 = Be sure air lines are supported and glad hands are properly connected. What is a converter dolly? You are driving with more than one trailer. What three methods can you use to secure a second trailer before coupling? True or False? The driver must yield the right-of-way to other vehicles when merging and when entering a highway from an alley. Study section 6.2 if you can't answer all of these questions. The braking systems of double and triple trailers are different than those of straight trucks because doubles and triples. The Verge logo. 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. "Glad hands" are coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer. C. the service brakes slowly move to the fully applied position, Some large trucks have converted or "spot" mirrors. Park on level ground, put chock on the tires, and charge the air tank. Converter dolly air tank drain valve: CLOSED Air lines supported and glad hands properly connected. For emergency braking you should: This has the same value as the %%SCORE%% Variable on the Final Screen. 1/3 For example: If you are traveling 60 MPH and it begins to rain, your suggested But the brakes will hold only as long as there is air pressure in the trailer air tank. Often do not have spring brakes If there are no dummy couplers, the glad hands can sometimes be locked together (depending on the couplings). retrovirus $_____________________________$. 0000006383 00000 n A. Definition. A Commercial Drivers License Overview, Trucking Terminology and Transportation Definitions. Safety chains should be secured to trailer(s). You MUST have air all the way to the back for all the brakes to work. ADVERTISEMENT ADVERTISEMENT A The A-dolly has a single drawbar with a single, centered hitching point. You are visually checking the coupling of a converter dolly to the rear trailer. you should avoid traveling next to others when possible. Open, free In double and triple trailers, the trailer air supply control should pop or _________ when air pressure drops into the range of 20 to 45 psi. The road is dry, and visibility is good. Connect the Converter Dolly to the Rear Trailer: Test the coupling by pulling against the pin of the second semitrailer. unsafe slow down even further, or better yet, find a safe haven and park until the Which is most likely to tip over: When driving with more than one trailer, which trailer should be the first one behind the tractor? 0000008915 00000 n 0000001162 00000 n They are filled by the emergency (supply) line from the tractor. 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. Correct answer percentage. Locking jaws closed on Trucks with trailers have a dangerous crack-the-whip effect. This will supply air to the emergency (supply) lines. 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. 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: These trailers have no parking brake. Go to Section 4: Other Topics This question is in Section 4: Other Topics of our CDL Test Guide. you are doing a walkaround inspection of a double or triple trailer rig. Be sure air-lines are supported and glad hands are properly connected. B. keep gentle pressure on the brakes while going through the water and for a short distance after coming out B. you need about four times as much stopping distance at 40 mph as at 20 mph On a triple combination, the shutoff valves on the rear of the last trailer should be? For emergency braking you should: which of these statements about emergency steering is true? 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; . Which of these is NOT a good thing to do when driving on slippery roads? Any time you have to 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 How do you know if your converter dolly is equipped with antilock brakes? The number and size of air tanks varies among vehicles. The road is dry and the visibility is good. We wish you the best of luck in your endeavors and are pleased to be of assistance. can and will get stuck on a raised railroad crossing. you are driving a set of doubles and a set of trailer wheels goes in a skid. You should keep at least ___ seconds of space ahead of you. Each trailer and converter dolly has one or more air tanks. Like a trailer, a dolly equipped with ABS will have a yellow indicator light on the left side. The road is dry and the visibility is good. There is no obligation whatsoever. A. air escape from the open valve Ensuring the safety of the public starts with a thorough inspection of all equipment. Doubles and triples are more likely to turn over than other combination vehicles because of the "crack- the-whip" effect. 0000001956 00000 n slow to safe speed before entering, then accelerate slightly through the curve. The converter dolly is an auxiliary axle with a coupling device. When inspecting the air brakes on doubles and triples, you wait for air pressure to reach normal, then push in the red trailer air supply knob. The rear trailers shut off valves should be closed and the front open to allow air to the The converter dolly air tank drain valve on coupled double and triple trailers should be: Closed. 5. 0000005664 00000 n A good and safe driver will always look out for ______. There are more things that can go wrong, and doubles/triples are less stable than other commercial vehicles. Chock the tires, park on level ground and charge the trailer air tank if it does D The crack the whip effect will topple the rear trailer first. The dolly tow bar may flip up causing bodily injury and making it very difficult to Contributor: Luke Nold (Experienced truck driver for 5+ years and published writer for Fleet Magazine). If it goes low enough, the trailer emergency brakes will come on. The trailer height is right when: The trailer will be raised slightly when the converter dolly is backed under it. The shut off valves, when in the open position, allows air to flow out to another trailer. They provide the air pressure used to operate trailer brakes. This has the same value as the %%PERCENTAGE%% Variable on the Final Screen. You should keep at least ____ seconds of space ahead of you. door. A. open Becoming A Truck Driver is a dream we've all pondered at some point in our lives. Never, 9. Use only the trailer brakes You must steer gently when pulling trailers. The pressure in the service line is controlled by the brake pedal and the trailer hand brake. A. open the shut-off valves at the rear of both trailers 3. 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: