Should the converter dolly air-tank drain valve be open or closed on a double trailer combination? Shut off valves are only used on trailers designed to be towed in conjunction with other trailers (doubles / triples). 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. If you feel Select the answer that correctly completes each statement. You should keep at least ____ seconds of space ahead of you. 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. Doubles/Triples Air Brake Check - digital.ncdcr.gov When coupling, be sure to couple the proper glad hands together. With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. 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. DMV Doubles Triples Practice Test | CDL Knowledge 60607. Which f these will result in the best control on curves? 0000006836 00000 n Make sure you have large enough gaps before entering or crossing traffic. Why should you not use the trailer hand valve while driving? To do this without wheels chocks you should: Supply air to the trailer air system with the tractor and then disconnect the emergency line. Go to Section 4: Other Topics This question is in Section 4: Other Topics of our CDL Test Guide. 0000008894 00000 n B. restore traction to the tires B. pull gently against the pin of the second semitrailer What types of trailers can get stuck on raised crossings? B. If loading fails, click here to try again. Some large trucks have curved (convex or spot) mirrors. 3. 5. Which of these is most likely too occur? This has the same value as the %%SCORE%% Variable on the Final Screen. The road is dry and visibility is good. Always test the trailer brakes before driving with the hand valve or by pulling the air supply (tractor protection valve) control. some large trucks have curved (convex or spot) mirrors. A. you can steer more quickly and safely if you hold the wheel with one hand Ship to Store. Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? You are driving a 100-feet truck with double trailers at 30 mph. Air escape from the open valve B The service brakes slowly move to the fully applied position C The emergency line valve open and release air D None of the above 4. paramount to safe driving. Dobles - Triples Pruebas de prctica 3 - NJ 2023 - CristCDL.com It is very important to keep the air supply clean. Converter dolly air tank drain valve: CLOSED. The total number of questions. In normal operation, trailer service brakes should be operated by? The pressure in the service line tells how much pressure the relay valves should send to the trailer brakes. Calculate the Mach number at section 2. When does the "driver's manual" advise disconnecting the steering axle brakes to help keep the rig straight? You should hear air escaping, showing the entire system is charged. A. hand valve You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. C. posted speed limits on curves are safe for all trucks, Empty trucks: The lighter trailer should be in the rear. Trucks with trailers have a dangerous crack-the-whip effect. Take this same test in our other testing modes How to Get a Hazardous Materials Endorsement, What is a CDL? A. countersteer 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 A converter dolly is still under the second trailer when you unlock the pintle hook. the trailer height is right when: the trailer will be raised slightly when the converter dolly is backed under it. Which of these is most likely to occur? Your vehicle is so long that you must swing wide to make the turn. When driving a double or triple trailer, greater care must be given to. You may be timed. On the middle trailer of a set of triples? 1/4 in. axle will have spring brakes due to the weight of the unit. 3. 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. The braking systems of double and triple trailers are different than those of straight trucks because doubles and triples. Which of these statements about managing space to the sides is true? You are driving a triple trailer and there is a loss of air pressure in the emergency line. converting it into two trailers, A coupling device of three or four axles and a fifth wheel by which a semitrailer can retrovirus $_____________________________$. Connect the Converter Dolly to the Rear Trailer: Test the coupling by pulling against the pin of the second semitrailer. For all brakes to work on a triple combination, you must have air supply? Only trailers designed to be pulled with another trailer behind it will have a shut off valve. This has the same value as the %%PERCENTAGE%% Variable on the Final Screen. How do you check to make sure the trailer height is correct before coupling? Use the engine brake or speed retarder. 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 shortest trailer The heaviest trailer 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? Be sure pintle-eye of dolly is in place in pintle hook of trailer(s). Air escape from the open valve Open the emergency line shut-off valve at the rear of the last trailer. We have a new version of this program. trailer << /Size 59 /Info 20 0 R /Root 22 0 R /Prev 29211 /ID[] >> startxref 0 %%EOF 22 0 obj << /Type /Catalog /Pages 19 0 R >> endobj 57 0 obj << /S 66 /Filter /FlateDecode /Length 58 0 R >> stream 0000005664 00000 n Which is most likely to tip over: Should the shut-off valves on the rear of the last trailer be open or closed? You will not be tested on uncoupling twins unless you want to get a double/triple trailer endorsement on your license. Air flows steadily and isentropically through a passage. A-dolly. For emergency braking you should: which of these statements about emergency steering is true? If spare tire is carried on converter gear (dolly), make sure it's secured. A. allow "much more space" than is needed for ideal driving conditions Doubles and triples are more likely to turn over than other combination vehicles because of the "crack-the-whip" effect. Make sure trailer height is correct. How can you test that air flows to all trailers? Older trailers do not have spring brakes. "Glad hands" are coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer. C. engaging the tractor valve protection control, You must drive through deep or flowing water. Number of wrong answers. 1. Free CDL - Doubles and Triples Flashcards | Quizlet Go to the rear of second trailer and open the emergency line shut-of valve. Doubles and triples are extremely prone to control issues and must be That split second that you release the brakes will allow them to match the vehicles road 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 Open the emergency line shut-off valve at the rear of the last trailer. Close the emergency line shut-off valve at the rear of the trailer. Therefore, look far ahead so you can slow down or change lanes gradually when necessary. 0000003060 00000 n Before you can supply air to the air tanks of a second trailer you need to: Open the shut-off valves at the rear of the first trailer and close the shut-off valves at the rear of second trailer. When you turn with the tractor/triple trailer combination the wheels that off-track (cheat) the most are: You should check trailer height before connecting a converter dolly to a second or third trailer. Closed, latched C. use controlled or stab braking, The best way to stop any skid is to: Double/Triple Flashcards | Quizlet Terms in this set (43) Converter dollies are used to connect: A tractor-trailer combination to another trailer. You are doing a walk around inspection of a double or triple trailer rig. A. air escape from the open valve you can fuck a pornstar craigslist cars and trucks for sale by owner; kd linear actuator kdpt007 what is ait in the army; native american spiritual cleansing prayer simple spectrum coupon code; . You 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. They are filled by the emergency (supply) line from the tractor. The tanks will hold enough air to allow the brakes to be used several times even if the compressor stops working. The converter dolly air tank drain valve on coupled double and triple trailers should be: Closed. If the dolly is a two axle unit then 1 What's a converter dolly? 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. 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? D B. allow one vehicle length for every 10,000 lbs of gross vehicle weight When uncoupling a rear trailer, your rig should be parked in a straight line on? If you do cross the air lines, supply air will be sent to the service line instead of going to charge the trailer air tanks. All trademarks are property of their respective owners. True False True If you want to couple a second trailer to you combiantion vehicle, secure it by using the: Trailer emergency air brakes. You need to be aware of how parking lots are arranged in order to avoid a long and difficult escape. Unless you are draining the condensation out of the air tank, then the drain valve The rear trailers shut-off valves should be open and the front closed. B. do not need to be checked as often as flat mirrors because they show a larger area B. keep gentle pressure on the brakes while going through the water and for a short distance after coming out 0000003998 00000 n 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. 5. A vehicle transporting hazardous materials is required to display placards where? the rig will continue moving in a straight line no matter how much the steering wheel is turned. Make sure you can hear air escaping with the valve closed. Air pressure is sent from the air tanks to the brakes by relay valves. Converter dolly air tank drain valve: CLOSED Air lines supported and glad hands properly connected. when does the drivers manual say you should disable the steering axle brakes? Each trailer and converter dolly has one or more air tanks. Join 50,000+ users around America to get your Commercial Driver License today! 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: 0000009556 00000 n 0000002446 00000 n If spare tire is on converter gear (dolly), make sure it is secured. you are doing a walkaround inspection of a double or triple trailer rig. HlTo xGf`{iIMh-x||?pbE':X4ZZZRbu7 uvi_RHUkVXBVu{^B3 4e/iw\]RE] YY7i)e V*h(++WQ-]Xm9c5yU6BS" 5HiL,[b)ee:t/ )%BVGpU7T\ZJD The lighter semitrailer should be in first position behind the tractor. You are visually checking the coupling of a converter dolly to the rear trailer. safe speed would be 40 MPH. By clicking on "Sign Up", you agree to our Terms of Use and Privacy Policy. You can find it here: High Road 2.0. Charge the system and pump the brakes with the window down. What does the drivers manual say about how much space you should keep ahead of your truck? A. use a low gear A 2023 WV Doubles - Triples CDL Practice Test 1 - CristCDL.com Refers to pulling two trailers at the same time, otherwise known as "pups" or "pup trailers" because they're only about 28 feet long. B. are the easiest to stop since there is no shifting cargo Those that do not have spring brakes have emergency brakes that work from the air stored in the trailer air tank. The final procedure when connecting a rear trailer is to? 0000001354 00000 n 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 That there is some space between the upper and lower fifth wheel. D Allow much more space than is needed for ideal driving condition. High Road 2.0! Converter dolly air tank drain valve: CLOSED. When does the Driver's manual say you should disable the steering axle brake? first check for battery voltage to the valve by probing the wires of the electrical connector with a volt-meter it should be about 10.5 volts if not it's probably bad.next remove the valve. Open, latched . Which of the following is true about loading cargo into double or triple trailers? unsafe slow down even further, or better yet, find a safe haven and park until the When only pulling one trailer, be sure the shut-off valves are all in the fully closed position. your vehicle is so long that you must swing wide to make a turn. The Home Depot Logo 0000010705 00000 n The dolly will have a yellow lamp on the drivers (left) side. . doubles/triples flip flop over from quick steering movements more easily than many other vehicles. 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. 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. Some vehicles have dead end or dummy couplers to which the hoses may be attached when they are not in use. Never unlock the pintle hook with the dolly still under the rear trailer. If the converter dolly is close to your semitrailer, you should wheel it into position? 1 When entering a roundabout, a driver must yield the right-of-way to drivers already in the roundabout and obey all traffic signs. In the coupling system, the locking jaws should be fixed around? 2003-2023 Chegg Inc. All rights reserved. Explore now! You should NOT: Any items you have not completed will be marked incorrect.

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