0000004668 00000 n If spare tire is carried on converter gear (dolly), make sure it's secured. with the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the trailer. 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 the trailer height is correct before coupling? Ideal for replacing a worn, leaky drain valve on a compressor. Do converter dollies have spring brakes? (done) Chp 23: Cash Flow + Working Capital, Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer. A Converter dollies are connected to front trailers with a? You should hear air escaping, showing the entire system is charged. When you do this, you should hear: You are driving a 100 foot twin trailer combination at 50 mph. Converter dolly air tank drain valve: CLOSED. Which of these is NOT a good thing to do when driving on slippery roads? C You can find it here: High Road 2.0. C The converter dolly air tank drain valve on coupled double and triple trailers should be: Closed. A Open, latched B Open, free C Closed, latched D Closed, free 28. The number of correct answers. To check that the trailer emergency brakes are working properly, you should pull out the trailer air supply control and? D Shut off valves are only used on trailers designed to be towed in conjunction with other trailers (doubles / triples). Which of these statements about quick steering movements and doubles/triples is true? mTouch Quiz will automatically populate the fields below. Any items you have not completed will be marked incorrect. That there is no space between upper and lower fifth wheel. You should not hear air escaping. Converter dollies have spring brakes. HlTo xGf`{iIMh-x||?pbE':X4ZZZRbu7 uvi_RHUkVXBVu{^B3 4e/iw\]RE] YY7i)e V*h(++WQ-]Xm9c5yU6BS" 5HiL,[b)ee:t/ )%BVGpU7T\ZJD C. closed, You can release the dolly brakes by: Which of these are the correct positions for shut-off valves in doubles and triples? A 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. 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. Many scientists are concerned that the melting of Earth's sea ice will increase Earth's surface temperature. 2022 DE Doubles - Triples CDL Quick Review 1 - CristCDL.com Close the emergency line shut-off valve at the rear of the trailer. Check them all. The heaviest trailer 0000001956 00000 n Trailer Air Tanks And Shutoff Valves - TruckingTruth These mirrors: make things seem smaller & further away then they really are. Should the shut-off valves on the trailers be open or closed on a set of double trailers? some large trucks have curved (convex or spot) mirrors. Light cords firmly in sockets on trailer. Hb```f``b`c``e@ (Q6_* 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: 0000007032 00000 n Connect the Converter Dolly to the Rear Trailer: Test the coupling by pulling against the pin of the second semitrailer. What does the Driver's manual say about how much space you should keep ahead of your truck? unsafe slow down even further, or better yet, find a safe haven and park until the 0000003240 00000 n These valves permit closing the air lines off when another trailer is not being towed. A coupling device of one or two axles and a fifth wheel by which a semitrailer can be coupled to the rear of a tractor-trailer combination forming a double bottom rig Should the shut off valves on the rear of the first trailer be open or closed on a set of double trailers? When does the "driver's manual" advise disconnecting the steering axle brakes to help keep the rig straight? CDL Doubles & Triples Practice Test 3 - Classic Mode - Trucker Country Delivering to. B. you should avoid traveling next to others whenever possible The braking systems of double and triple trailers are different than those of straight trucks because doubles and triples. Otherwise, the dolly tow bar may fly up, possibly causing injury and making it very difficult to re-couple. Clean the couplers and rubber seals before a connection is made. 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. The pintle hook? The emergency line valve open and release air Also, this page requires javascript. When uncoupling a rear trailer, you should remove some weight from the dolly by? Those that do not have spring brakes have emergency brakes that work from the air stored in the trailer air tank. Flammable materials in the front trailer then it must have the placards on that trailer. a. blood 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. d. protein. Which of these is most likely too occur? Calculate the Mach number at section 2. You are driving with double trailers and must use your brakes to avoid a crash. Doubles and triples must be driven very smoothly to avoid rollover or jackknife. If a converter dolly is still under the second trailer and you unlock the pintle hook, what will probably happen? The Verge logo. 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. Hit the article to see the way to back up your trailer like a pro! However there are some states that allow doubles that are each 48 feet in length. A. completely open Take this same test in our other testing modes How to Get a Hazardous Materials Endorsement, What is a CDL? Doubles/Triples Air Brake Check - digital.ncdcr.gov When does the Driver's manual say you should disable the steering axle brake? 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. Doubles and triples must be driven very smoothly to avoid rollover or jacknife. 5. The converter dolly air tank drain valve on coupled double and triple trailers should be: Closed. You are doing a walk around inspection of a double or triple trailer rig. 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. 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). This has the same value as the %%SCORE%% Variable on the Final Screen. On a triple combination, the shutoff valves at the rear off the middle trailer should be? You are driving a tractor with multiple trailers. 7.3 Inspecting Doubles and Triples = Additional Things to Check During a Walkaround Inspection. Should the shut off valves on the rear of the first trailer be open or closed on a set of double trailers? Learn more and apply here: TruckingTruth was founded by Brett Aquila (that's me! These valves permit closing the air lines off when another trailer is not being towed. If you have traffic on both sides of your vehicle and something is blocking your lane, a move to the right still be best. 1. None of the above, 5. The puzzle: At the far left edge, the plates are in contact, so the path length difference between rays 222 and 333 is zero. C Never unlock the pintle hook with the dolly still under the rear trailer. A bent or damaged kingpin on a coupling should be? 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. There are more things that can go wrong, and doubles/triples are less stable than other commercial vehicles. Email Updates When New Articles Are Posted. The total number of questions. CDL Doubles and Triples Test Question and Answers B There is more chance for skids and loss of traction. the crack-whip effect that triubkes trucks with trailers is most likely to cause a tip over when. coupled to the rear of a tractor-trailer combination forming a double bottom rig, A coupling device of one or two axles and a sixth wheel by which a semitrailer can be Double and Triples Part 1 Flashcards - flashcardmachine.com If you feel When you are pulling trailers, which of the following statements is true about steering? What is most likely to happen if the trailer protection valve of a double or triple trailer does not function correctly? Florida CDL Handbook | FL CDL Handbook Coupling & Uncoupling for you want to hook your combination to a second trailer that has no spring brakes. 2023 WV Doubles - Triples CDL Practice Test 1 - CristCDL.com you should not, when you turn with the tractor/triple trailer combination the wheels that offtrack(cheat) the most are. Why is there still destructive interference? to re-capture it. Why should you check for when inspecting the converter dolly? Eventually, the air will leak away, and then there will be no brakes. You should keep at least ____ seconds of space ahead of you. If your tractor protection valve doesn't work properly, then if an air hose starts to leak what could happen? 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. 1/2 to 3/4 of an inch A. countersteer 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: will have a lamp on the drivers side. 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. Slow to a safe speed before entering the curve, then coast through the curve. Pull gently against them in a low gear to make sure the brakes work. C. use controlled or stab braking, The best way to stop any skid is to: You should be sure the converter dolly air tank drain valves are _______ and the pintle hook is _____. This has the same value as the %%PERCENTAGE%% Variable on the Final Screen. you should keep atleast __seconds of space ahead of you. Terms in this set (43) Converter dollies are used to connect: A tractor-trailer combination to another trailer. The application only takes one minute. Leave the emergency line shut-off valve closed and open the service line valve. Antilock Braking Systems on Converter Dollies, Converter dollies built on or after March 1, 1998, are required to have antilock brakes. While inspecting your converter dolly coupling, you should make sure there is _______ between the upper and lower fifth wheel. you are driving on a slippery road during the day. 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: Make a sketch that explains this phenomenon in terms of a feedback loop . Definition. Each trailer and converter dolly has one or more air tanks. Inspecting Doubles And Triples | High Road Online CDL Training 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. It is important to check the height of the trailer before connecting a converter dolly to a trailer. While it is general practice to make blue the service line, red the emergency line, and green the electrical line, these colors are not required by any laws or regulations. Provides a snug fit to eliminate unwanted seepage of air or water. We are an independent company focused on providing valuable motor vehicle and permit practice test information. You should be sure the converter dolly air tank drain . A sudden movement with the steering wheel can result in a tipping over rear trailer. A Join 50,000+ users around America to get your Commercial Driver License today! Which of the following will occur? 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. 3. Ensuring the safety of the public starts with a thorough inspection of all equipment. The A-dolly has a single drawbar with a single, centered hitching point. 11 During normal operation the brakes of the double/triple trailer are controlled by: 0000006383 00000 n When driving doubles or triples how should they be driven to avoid rollover or jackknifing: Be sure air-lines are supported and glad hands are properly connected. You are driving with double trailers and must use your brakes to avoid a crash. C [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." To do this without wheel chocks you should: Empty trucks: When parking your double or triple combination, you should look for a parking space ADVERTISEMENT ADVERTISEMENT The rear trailer does not have shut-off valves. Tips for Backing Up a Trailer Like a Pro Trucker. 6. doubles/triples flip flop over from quick steering movements more easily than many other vehicles. 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. You should be sure the converter dolly air tank drain valves are _______ & the pintle hook is __________. Remember, the service line is not used unless you depress the brake pedal or use the trailer hand valve. Seriously! A) closed . How To Use Cruise Control Effectively As A Truck Driver. Which of these is most likely to occur? Doubles/Triples Endorsement Flashcards | Quizlet B Any trailer with a reduced ground clearance In the coupling system, the locking jaws should be fixed around? Ship to Store. Page 7-6 Commercial Driver's Manual/2.0 = Be sure air lines are supported and glad hands are properly connected. If this activity does not load, try refreshing your browser. B. releasing the pintle hook If the dolly is a two axle unit then 1 Each trailer and converter dolly has one or more air tanks. When you're finished, check your score and results. Double and triple trailers increase not only the operators risk of safety, but also the other motorists around him. Learn more and apply here: The more heavily loaded semitrailer should be in first position behind the tractor. What is one function of the tractor protection valve? A green traffic light allows the driver to go. Which is most likely to tip over: 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. for coupled doubles and triples, be sure that the pintle hook is in the open position Visually check to make sure that the rear trailer is slightly lower than the center of the Always test the trailer brakes before driving with the hand valve or by pulling the air supply (tractor protection valve) control. Time used (Requires timer add on). you should check the trailer height before connecting a converter dolly to a second or third trailer. Either the front or the rear brakes will not work properly or fully. Becoming A Truck Driver is a dream we've all pondered at some point in our lives. 9 Questions You Must Ask, Decide if Truck Driving is The Correct Career Path, Do Not Sell or Share My Personal Information. New! A low air buzzer will go off indicating something is wrong and either the front or the 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. 2. Disconnect the glad-hand at the front of the first trailer and listen for air flow. 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. Allow much more space than is needed for ideal driving condition. B. pull gently against the pin of the second semitrailer For emergency braking you should: which of these statements about emergency steering is true? 0000003060 00000 n A thorough pre-trip inspection should catch any major service line leaks before you begin your trip. The lightest trailer Connect Converter Dolly to Front Trailer Back first semitrailer into position in front of dolly tongue. 0000007487 00000 n True or False? 0000004689 00000 n Doubles and triples are more likely to turn over than other combination vehicles because of what effect? You should keep at least ____ seconds of space ahead of you. 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 _______. Air Storage and Drain Tanks: Air storage tanks are used to hold compressed air. You are visually checking the coupling of a converter dolly to the rear trailer. With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. Blue is used for the service lines, and red for the emergency (supply) lines. Air escape from the open valve You are driving with double trailers and must use your brakes to avoid a crash. Please use the form below to contact our customer service or sales team. Locking jaws closed on B NPT thumbscrew style design enables easy installation. When coupling twin trailers, a converter dolly is. You should keep at least ____ seconds of space ahead of you. On the middle trailer of a set of triples? axle will have spring brakes due to the weight of the unit. When driving a truck with more than one trailer, which trailer should be first behind the truck? A turn of the glad hand attached to the hose will join and lock the couplers. Why should you not use the trailer hand valve while driving? Only a certified diesel mechanic can check this. There are more critical parts to check when you have two or three trailers. The converter dolly air tank drain valve on coupled double and triple trailers should be: When inspecting coupled doubles and triples, make sure the pintle hooks are: How can you be sure you supplied air to a second trailer? ), a 15 year truck driving veteran, in January 2007. Therefore, it is very important for safety that you use wheel chocks when you park trailers without spring brakes. 0000001582 00000 n The converter dolly air tank drain valve on coupled double/triple trailers should be: Answer: Closed. During normal operation the brakes of the double/triple trailer are controlled by: You are driving at night and you must dim your headlights for traffic. When you do this, you should hear: you are driving with double trailer and must use your brakes to avoid a crash. These mirrors: Push the brake pedal as hard as you can and hold it there How do you know if your converter dolly is equipped with antilock brakes? This has the same value as the %%WRONG_ANSWERS%% Variable on the Final Screen. Locking jaws closed on Some vehicles have dead end or dummy couplers to which the hoses may be attached when they are not in use. CDL Doubles and Triples Test Question and Answers 2023 [PDF]: Commercial Drivers License Doubles and Triples Endorsements Knowledge Test. High Road 2.0! Stay up to date on truck driving industry news. You must steer gently when pulling trailers. Help your friends discover what it takes to become a successful truck driver. B. the emergency line valve open and release air C All other trailer air functions use the emergency line. Why should you use chocks when parking a trailer without spring brakes? 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. Make sure you do not get in a spot you cannot pull straight through. Air flows steadily and isentropically through a passage. Which of these statements about managing space to the sides is true? A truckers workspace is a small moving office Read More. The road is dry and visibility is good. Any trailer, 7. Take special care when pulling two and three trailers. Any vehicle, regardless of size, designed to transport 16 or more persons, including the driver. a sudden movement with the steering wheel can result in a tipped over rear trailer, you wish to turn right from one two-lane, two-way street to another. the rig will continue moving in a straight line no matter how much the steering wheel is turned. PDF Doubles and triples 1. The stopping distance for a tractor trailer You are doing a walk around inspection of a double or triple trailer Secure converter gear support in raised position. Locking jaws closed on 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. 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 uncoupling, you should never unlock the _______ with the dolly still under the rear trailer. Therefor, if there is a major leak in your service line, you may not know it until you try to use the service brake. 0000005554 00000 n Should I Be A Truck Driver? All trademarks are property of their respective owners. D When you're trying to correct a drive-wheel braking skid why should you stop braking? At section 2 downstream, the speed is 519 m/s. What is the most common foundation brake found on heavy vehicles? The rear trailer of a double Pull gently against the pin of the second trailer. Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front?