The heavier trailer should be in the rear. What three methods can you use to secure a second trailer before coupling? C How much space should be between the upper and lower fifth wheels? How do you check to make sure trailer height is correct before coupling? Learn more and apply here: TruckingTruth was founded by Brett Aquila (that's me! A. air escape from the open valve On double and triple combinations, you must make sure that which of these is secure? NPT thumbscrew style design enables easy installation. 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. The trailer height is right when: The trailer will be raised slightly when the converter dolly is backed under it. Allow more following distance. You need to brake in order to regain control. Air pressure is sent from the air tanks to the brakes by relay valves. This has the same value as the %%PERCENTAGE%% Variable on the Final Screen. There are more critical parts to check when you have two or three trailers. Which of these is most likely to occur? Therefore, look far ahead so you can slow down or change lanes gradually when necessary. Why should you use chocks when parking a trailer without spring brakes? you are visually checking the coupling of a converter dolly to the rear trailer. You should keep at least ___ seconds of space ahead of you. how much space should be between the upper and lower fifth wheel? You should be sure the converter dolly air tank drain valves are _____ and the pintle hook is ____. The rear trailer of a double When uncoupling a rear trailer, you should remove some weight from the dolly by? It is very important to keep the air supply clean. With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. Connect the Converter Dolly to the Rear Trailer: Test the coupling by pulling against the pin of the second semitrailer. 3. 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). High Road 2.0! The lighter trailer should be in the rear. What does the Driver's manual say about how much space you should keep ahead of your truck? D True! 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. Before coupling a trailer, you should make sure it is at the right height using? How do you check to make sure the trailer height is correct before coupling? Should the converter dolly air-tank drain valve be open or closed on a double trailer combination? safe speed would be 40 MPH. C Seriously! doubles/triples flip flop over from quick steering movements more easily than many other vehicles. Like a trailer, a dolly equipped with ABS will have a yellow indicator light on the left side. A truckers workspace is a small moving office Read More. When does the "driver's manual" advise disconnecting the steering axle brakes to help keep the rig straight? These mirrors: Make things seem smaller and further away than they really are. Sometimes, metal tags are attached to the lines with the words service and emergency stamped on them. 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: Speed for other vehicles is often too fast for a multi-combination unit! A Commercial Drivers License Overview, Trucking Terminology and Transportation Definitions. 2003-2023 Chegg Inc. All rights reserved. You should avoid traveling next to others when possible. If the spring brakes do not release when you push the trailer air supply control, check the air line connections. You should be sure the converter dolly air tank drain valves are _______ and the pintle hook is _____. The emergency brakes come on whenever air pressure in the emergency line is lost. B. use only the trailer brakes You should reduce your speed by about _____ on a wet road. This will prevent water and dirt from getting into the coupler and the air lines. B What three methods can you use to secure a second trailer before coupling? If your tanks have automatic drains, they will keep most moisture out, but you should still open the drains to make sure. Mar 2 - Mar 3. A. hand valve You are doing a walkaround inspection of a double or triple trailer rig. Once you are finished, click the button below. 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. 0000010285 00000 n A good and safe driver will always look out for ______. Hit the article below to see specific information about AOBRDs! In the coupling system, the locking jaws should be fixed around? you are driving a set of doubles and a set of trailer wheels goes in a skid. 11 During normal operation the brakes of the double/triple trailer are controlled by: Closed, latched A-dolly. Park the rear trailer against another trailer, chock the tires and lock the trailer We'll help you make the right choices and prepare for a great start to your trucking career. Which of these statements about quick steering movements and doubles/triples is true? 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. If you have traffic on both sides of your vehicle and something is blocking your lane, a move to the right still be best. If it goes low enough, the trailer emergency brakes will come on. Doubles and triples are more likely to overturn than other combination vehicles because of the whip cracking effect. 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? 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. In order to receive your Doubles and Triples endorsement, it is required that you pass the states official CDL written Knowledge exam. The crack the whip effect that troubles trucks with trailers. Because of this, which of the following vehicle parts is most likely to tip over? you should keep atleast __seconds of space ahead of you. If the dolly is a two axle unit then 1 Join 50,000+ users around America to get your Commercial Driver License today! What does the Commercial Driver Handbook say about how much space you should keep ahead of your truck? front of the second trailer. Open. . fumoto drain valve. B When driving a truck with more than one trailer, which trailer should be first behind the truck? Stay up to date on truck driving industry news. Always unlock the pintle hook with the dolly still under the rear trailer. a. blood You MUST have air all the way to the back for all the brakes to work. 5. 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. All material on this website is copyrighted. Open, latched 0000003977 00000 n Your vehicle is so long that you must swing wide to make the turn. New! d. protein. open, closed, closed: Term. What types of trailers can get stuck on raised crossings? When checking the coupling system, make sure that the locking jaws are around the shank of the. Visually check to make sure that the rear trailer is slightly lower than the center of the The converter dolly air tank drain valve on coupled double and triple trailers should be: Closed. [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]. Slow to the safe speed before entering, then accelerate slightly through the curve. Chock the tires, park on level ground and charge the trailer air tank if it does c. iron All rights reserved Site Map. Explore now! B. releasing the pintle hook Open CDL License Requirements State By State. Safety chains secured to trailer (s). B 0000001375 00000 n Go to Section 4: Other Topics This question is in Section 4: Other Topics of our CDL Test Guide. Pull gently against them in a low gear to make sure the brakes work. 0000010783 00000 n They are filled by the emergency (supply) line from the tractor. b. cell Driving doubles/triples is also more dangerous in hot and cold weather driving, as well as on mountain roads. While inspecting your converter dolly coupling, you should make sure there is _______ between the upper and lower fifth wheel. More driving knowledge, questions and answers, online practice tests for obtaining a drivers . True! what is likely to happen if the pintle hook is unlocked with the dolly still under the second trailer? 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 _______. A. always keep your vehicle to the right side of your lane B. slightly raised 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? Then, the air loss from the leak will lower the air tank pressure quickly. 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. Be certain you are clear at the sides before changing lanes. 2. That split second that you release the brakes will allow them to match the vehicles road A. opening the air tank petcock Which of these are the correct positions for shut-off valves in doubles and triples? You should be sure the converter dolly air tank . Unless you are draining the condensation out of the air tank, then the drain valve This section explains how important it is to be careful when driving with more than one trailer, how to couple and uncouple correctly, and about inspecting doubles and triples carefully. 1/32 to 3/32 of an inch. Locking jaws closed on Make sure pintle hook is latched. It depends on the load 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. Explain why the waves that reflect from the far left edge of the plates in the given figure earlier exhibit destructive interference (zero intensity) at x=0x=0x=0. Make sure you can hear air escaping with the valve closed. How do you know if your converter dolly is equipped with antilock brakes? Connect the Converter Dolly to the Rear Trailer: Test the coupling by pulling against the pin of the second semitrailer. You are visually checking the coupling of a converter dolly to the rear trailer. 1) the first one is to pump down the air pressure in the system between 20 and 45psi (pounds per square inch) the trailer air supply will pop out, shutting air off to the trailer. coupled to the rear of a tractor-trailer combination forming a double bottom rig, Careful of the wording! You have not finished your quiz. Air escape from the open valve You are driving with double trailers and must use your brakes to avoid a crash. Close the emergency line shut-off valve at the rear of the trailer. Only trailers designed to be pulled with another trailer behind it will have a shut off valve. When uncoupling doubles or triples, what is important to know about unlocking the pintle hook? A) one inch of space . Your tractor protection valve control should pop out, or go from normal to emergency position, when air pressure falls into what range? Which of these is NOT a good thing to do when driving on slippery roads? should remain in the closed position. Follow the procedures described later in this section. 0000006836 00000 n Allow much more space than is needed for ideal driving condition. You should be sure the converter dolly air tank drain valves are _______ & the pintle hook is __________. Ensuring the safety of the public starts with a thorough 7.3 Inspecting Doubles and Triples = Additional Things to Check During a Walkaround Inspection. Which of the following will occur? Safety chains should be secured to trailer(s). Which of the following must be connected when coupling tractor to trailer or trailer to trailer? Doubles and triples are more likely to turn over than other combination vehicles because of the "crack- the-whip" effect. 1/4 in. 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. These dollies will have a yellow lamp on the left side of the dolly. You are driving with double trailers and must use your brakes to avoid a crash. A. use light, steady pressure on the brake pedal B All trademarks are property of their respective owners. 1 In normal operation, trailer service brakes should be operated by? Before you can supply air to the air tanks of a second trailer you need to. You are driving with more than one trailer. Which trailer should come first behind the tractor? 9. Blue is used for the service lines, and red for the emergency (supply) lines. 1. There is no obligation whatsoever. In order to receive your Doubles and Triples endorsement, it is required that you pass the state's official CDL written Knowledge exam. 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. 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. B. keep other traffic out of your side space Calculate the voltage gain of each. slow to safe speed before entering, then accelerate slightly through the curve. You should keep at least ____ seconds of space ahead of you. Make sure you have large enough gaps before entering or crossing traffic. When you're trying to correct a drive-wheel braking skid why should you stop braking? Submit your email at the end of the test. What should you check for when inspecting the converter dolly and the pintle hook? B Push the brake pedal as hard as you can and hold it there What three methods can you use to secure a second trailer before coupling? can and will get stuck on a raised railroad crossing. You may not notice a major leak in the service line until you try to put the brakes on. You are driving a 100 ft twin trailer combination at 50 mph. King pin. 10. if you have traffic on both sides of your vehicle and something is blocking your lane, a move to the right still be best. A dolly has lights, air tanks, air relays, air lines, air brakes, ABS, electrical connections, etc. The application only takes one minute. You should keep at least ____ seconds of space ahead of you. For emergency braking you should: You are doing a walk around inspection of a double or triple trailer rig. B. are the easiest to stop since there is no shifting cargo C. closed, You can release the dolly brakes by: 7. You are driving a triple trailer and there is a loss of air pressure in the emergency line. You may be timed. Each trailer and converter dolly has one or more air tanks. When driving doubles or triples how should they be driven to avoid rollover or jackknifing: 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. Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? Time limit varies by state. - Converter dolly air tank drain valve: CLOSED. The rear trailer of a triple which of these figures shows how the turn should be made, if you want to couple a second trailer to your combination vehicle, secure it by, the trailers spring brakes & wheel chocks. B. you should avoid traveling next to others whenever possible ), a 15 year truck driving veteran, in January 2007. Light cords firmly in sockets on trailer. Hit the article to see the way to back up your trailer like a pro! 0000004668 00000 n B Study section 6.2 if you can't answer all of these questions. 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. good speed management says you should, may have poor traction due to bouncing and wheel lock up. and ensuring it is secure. If you crossed the air lines, you could drive away, but you would not have trailer brakes. when does the drivers manual say you should disable the steering axle brakes? You want to lock your combination to a second trailer that has no spring brakes. Sketch the shape of the passage between sections 1 and 2. Which diagram shows the best way to turn? Which of these is the correct answer? D None of the above, 4. 0000006383 00000 n 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. 0000001354 00000 n 0000006015 00000 n If spare tire is carried on converter gear (dolly), make sure it's secured. There is a school zone ahead. CDL Doubles and Triples Test Question and Answers 2023 [PDF]: Commercial Drivers License Doubles and Triples Endorsements Knowledge Test. B. pull gently against the pin of the second semitrailer 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. Open the emergency line shut-off valve at the rear of the last trailer. With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. the crack-whip effect that triubkes trucks with trailers is most likely to cause a tip over when. These dollies will have a yellow lamp on the left side of the dolly Questions You Should Know For Doubles And Triples 1. C. always keep your vehicle to the left side of your lane, When testing the coupling of double trailers, the landing gear of the rear trailer should be: What do you check when making a visual check of coupling? 0000002446 00000 n 0000007032 00000 n Correct answer percentage. The road is dry and visibility is good. Safety fail-safe features of a tractor-trailer converter dolly. The braking systems of double and triple trailers are different than those of straight trucks because doubles and triples. B. open; latched The road is dry and visibility is good. 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. 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 _____. Question 4. Air flows steadily and isentropically through a passage. Charge the system and pump the brakes with the window down. What is a converter dolly? Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? 2 The pressure in the service line is controlled by the brake pedal and the trailer hand brake. This has the same value as the %%TOTAL%% Variable on the Final Screen. Converter dolly air tank drain valve: CLOSED. Types of converter dollies. mTouch Quiz will automatically populate the fields below. 0000006195 00000 n The air lines will rupture Should I Be A Truck Driver? 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. Trucks with trailers have a dangerous crack-the-whip effect. This means. The road is dry, and visibility is good. Use the engine brake or speed retarder. You should be sure the converter dolly air tank drain . The rear trailer does not have shut-off valves. 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. Clean the couplers and rubber seals before a connection is made. 0000007487 00000 n A converter dolly is still under the second trailer when you unlock the pintle hook. Why is there still destructive interference? Never pull any trailer without visually inspecting the fifth wheel locking bar 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. Take special care when pulling two and three trailers. 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. close the shut-off valves at the rear of the first trailer and open the shut-off valves at the rear of the second trailer, To check that the converter dolly is securely coupled to the rear trailer, you should: Hb```f``b`c``e@ (Q6_* 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. Time used (Requires timer add on). 2) the second test is to go out to the trailer to ensure that the parking brakes have indeed applied. Pickup at South Loop. If you leave this page, your progress will be lost. The dolly tow bar may flip up causing bodily injury and making it very difficult to These mirrors: S-cam brakes are the most common style brakes on large trucks today. Any time you have to When you do this, you should hear: The trailer is at the correct height when. We are here to help. 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. 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 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. A. completely open Should the pintle hook be latched or unlatched when backing a dolly under the second trailer? What do you check when making a visual check of coupling? C. the service brakes slowly move to the fully applied position, Some large trucks have converted or "spot" mirrors. For emergency braking you should: What three methods can you use to secure a second trailer before coupling? Which of these statements about managing space to the sides is true? 0000005554 00000 n re-couple, You can if you want to, it does not matter. Eventually, the air will leak away, and then there will be no brakes. Email Updates When New Articles Are Posted. 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. The heaviest trailer If not, there is a problem. After 15 years on the road I wanted to help people understand the trucking industry and everything that came with the career and lifestyle of an over the road trucker. which of these statements about managing space to the sides is true? If you do, there is a problem. Air pressure is sent from the air tanks to the brakes by relay valves. 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: kingpin. There are more things that can go wrong, and doubles/triples are less stable than other commercial vehicles. 12, 3. Air will not be available to release the trailer spring brakes (parking 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. Open the emergency line shut-off valve at the rear of the last trailer. will have a lamp on the drivers side. There are two types of converter dollies. When uncoupling a rear trailer, your rig should be parked in a straight line on? 27. The road is dry and the visibility is good. Each trailer and converter dolly has one or more air tanks. A rear brakes will not work properly. 0000008894 00000 n Newer trailers have spring brakes just like trucks and truck tractors. To do this without wheels chocks you should: Supply air to the trailer air system with the tractor and then disconnect the emergency line.

Beaufort County School District Employees, The Gee Family Liverpool, C6h5nh3cl Acid Or Base, Law Justice, And Society Minor Ut Austin, Summer Jobs In Nantucket For College Students, Articles T