If the converter dolly is close to your semitrailer, you should wheel it into position? A. completely open 0000008915 00000 n
allow "much more space than is needed for ideal driving conditions". D Disconnect the glad-hand at the front of the first trailer and listen for air flow. The rear trailer of a double A This has the same value as the %%WRONG_ANSWERS%% Variable on the Final Screen. 0000001956 00000 n
B. do not need to be checked as often as flat mirrors because they show a larger area What three methods can you use to secure a second trailer before coupling? Wait for air pressure to reach normal, then push in the red trailer air supply knob. 0000009556 00000 n
Close the emergency line shut-off valve at the rear of the trailer. The front trailer in a set of double trailers is most likely to turn over due to the Crack-the-Whip effect. B. allow one vehicle length for every 10,000 lbs of gross vehicle weight the trailer height is right when: the trailer will be raised slightly when the converter dolly is backed under it. C. closed; unlatched, Which of these will result in the best control on a curve? 0000004668 00000 n
They provide the air pressure used to operate trailer brakes. Which of the following is true about loading cargo into double or triple trailers? You will not be tested on uncoupling twins unless you want to get a double/triple trailer endorsement on your license. The best way to keep brakes from getting to hot while going down long grades is to: Go slow and use only light, steady pressure on the brakes. Question 4. The shut off valves, when in the open position, allows air to flow out to another trailer. ADVERTISEMENT ADVERTISEMENT Doubles Triples Endorsement Test Flashcards | Quizlet You are visually checking the coupling of a converter dolly to the rear trailer. Slow to a safe speed before entering the curve, then coast through the curve. The A-dolly has a single drawbar with a single, centered hitching point. A Simply click in your answer to each CDL practice test question. a. blood B. slightly raised What three methods can you use to secure a second trailer before coupling? Also, this page requires javascript. Seriously! fumoto drain valve. B The final procedure when connecting a rear trailer is to? The heavier trailer should be in the rear. They are filled by the emergency (supply) line from the tractor. CDL Doubles & Triples Practice Test 3 - Classic Mode - Trucker Country Make sure pintle hook is latched. Hook dolly to front trailer. When does the "driver's manual" advise disconnecting the steering axle brakes to help It depends on the load 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. We are an independent company focused on providing valuable motor vehicle and permit practice test information. D 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. Calculate the Mach number at section 2. Take this same test in our other testing modes How to Get a Hazardous Materials Endorsement, What is a CDL? CDL Doubles and Triples Test Question and Answers A. Like a trailer, a dolly equipped with ABS will have a yellow indicator light on the left side. 5. 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? The pintle hook? Question 3 Explanation: All of the above. Sometimes, metal tags are attached to the lines with the words service and emergency stamped on them. A low air buzzer will go off indicating something is wrong and either the front or the Locking jaws open Take special care when pulling two and three trailers. You are driving a 100-feet truck with double trailers at 30 mph. What should you check for when inspecting a converter dolly? %PDF-1.2
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The shut off valves prevent air from going any further. You are doing a walk around inspection of a double or triple trailer rig. When entering a roundabout, a driver must yield the right-of-way to drivers already in the roundabout and obey all traffic signs. ), a 15 year truck driving veteran, in January 2007. What three methods can you use to secure a second trailer before coupling? This would be very dangerous. you are driving at night and you must dim your headlights for traffic. How do you check to make sure trailer height is correct before coupling? Related Question Question: What does this sign mean? If one air system is very low on pressure _______. We have a new version of this program. These mirrors: make things seem smaller & further away then they really are. The trailer is at the correct height when. 1/2 to 3/4 of an inch If this lamp is illuminated and does not go out, Doubles and triples take up more space than other commercial vehicles. The emergency brakes come on whenever the air supply knob is pulled out or the trailer is disconnected. The road is dry and the visibility is good. Open. You can also reach us at (888) 830-2326. Double and triple trailers increase not only the operators risk of safety, but also the other motorists around him. Often do not have spring brakes Try our free CDL Doubles and Triples Test Question and Answers Quiz online. Any combination of vehicles with a gross combined weight rating (GCWR) of 26,001 or more pounds, providing the gross vehicle weight rating (GVWR) of the vehicle being towed is in excess of 10,000 pounds. Your tractor protection valve control should pop out, or go from normal to emergency position, when air pressure falls into what range? during normal operation the brakes of the double/triple trailer are controlled by : which of these will result in the best control on curves? To help avoid mistakes, colors are sometimes used. Use the engine brake or speed retarder. 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. "Glad hands" are coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer. The tanks will hold enough air to allow the brakes to be used several times even if the compressor stops working. locked . 9 Before coupling a trailer, you should make sure it is at the right height using? You should avoid traveling next to others when possible. _______ should be tested with the hand valve but controlled in normal operation with the foot pedal. What types of trailers can get stuck on raised crossings? You open the emergency line shut-off valve at the rear of the last trailer and hear air escaping. You should keep at least _____ seconds of space ahead of you: You are driving with double trailers and must use your brakes to avoid a crash. 1/3 For example: If you are traveling 60 MPH and it begins to rain, your suggested The application only takes one minute. Learn more and apply here: The more heavily loaded semitrailer should be in first position behind the tractor. securely fastened. 0000001775 00000 n
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. Safety fail-safe features of a tractor-trailer converter dolly. Your vehicle is so long that you must swing wide to make the turn. 0000006015 00000 n
How can you test that air flows to all trailers? The last trailer in a combination is most likely to turn over. the trailer will be raised slightly when the converter dolly is backed under it the best way to keep brakes from getting too hot while going down long grades is to : go slow and use only light, steady pressure on the brakes you are driving a 100ft truck with double trailers at 30mph. To do this without wheel chocks you should: Empty trucks: When parking your double or triple combination, you should look for a parking space The crack the whip effect that troubles trucks with trailers. Compressed air usually has some water and some compressor oil in it. 0000003240 00000 n
Calculate the voltage gain of each. 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. D Doubles and triples must be driven very smoothly to avoid rollover or jackknife. 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? Which of these is NOT a good thing to do when driving on slippery roads? Once you have coupled your rear trailer, you should test the coupling by? Learn more and apply here: TruckingTruth was founded by Brett Aquila (that's me! Opening the shut off valves on the rear most trailer will ensure the lines are flowing dress gifs. Air Storage and Drain Tanks: Air storage tanks are used to hold compressed air. More driving knowledge, questions and answers, online practice tests for obtaining a drivers . 0000006195 00000 n
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. 4. Park on level ground, put chock on the tires, and charge the air tank. which of these statements about the handling of doubles and triples is true ? If your tractor protection valve doesn't work properly, then if an air hose starts to leak what could happen? B. "Glad hands" are coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer. There are more critical parts to check when you have two or three trailers. Pull gently against the pin of the second trailer. Shut-off valves (at rear of trailers, in service and emergency lines): When pulling doubles or triples, what is important to know about the order of the trailers? Finsbury Pump Systems 400l (Single Stage) 5.5hp Honda Gx Petrol Engine should remain in the closed position. paramount to safe driving. Correct answer percentage. When you're finished, check your score and results. 0000010285 00000 n
How much space should be between the upper and lower fifth wheels? To prevent trailers from rolling over, you must steer gently and go slowly around corners, on ramps, off ramps and curves. 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: True! You are driving with double trailers and must use your brakes to avoid a crash. when does the drivers manual say you should disable the steering axle brakes? how much space should be between the upper and lower fifth wheel? 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. Safety should never take second place, so know your stuff! You need to stop braking because it's necessary for you to speed up, When you are in a drive-wheel braking skid, the first thing to do is STOP BRAKING! If the fifth wheel on a coupling is too far forward, the tractor frame may hit? New! High Road 2.0! 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. CDL License Requirements State By State. A Converter dolly air tank drain valve: CLOSED. Double/Triple Flashcards | Quizlet Describe what the trailer air supply control does. Older trailers do not have spring brakes. D [California Commercial Driver Handbook] The weight of a truck: Is a major factor affecting stopping distance. Those that do not have spring brakes have emergency brakes that work from the air stored in the trailer air tank. What happens when there is a major leak in the emergency air line? They are filled by the emergency (supply) line from the tractor. 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. C Be more careful in adverse conditions. The puzzle: At the far left edge, the plates are in contact, so the path length difference between rays 222 and 333 is zero. B. pull gently against the pin of the second semitrailer Explore now! These dollies will have a yellow lamp on the left side of the dolly Questions You Should Know For Doubles And Triples 1. A converter dolly is a piece of equipment designed to allow commercial trucks, such as semi-trucks, to pull a trailer. Therefore, look far ahead so you can slow down or change lanes gradually when necessary. Many scientists are concerned that the melting of Earth's sea ice will increase Earth's surface temperature. The pressure in the service line tells how much pressure the relay valves should send to the trailer brakes. . C. 3, You are doing a walk around inspection of a double or triple trailer rig. When doing a walkaround inspection of a double or triple trailer, the shut-off valves should be _______ at the rear(s) of the front trailer(s) and ________ at the rear of the last trailer. 0000003977 00000 n
When you do this, you should hear: you are driving with double trailer and must use your brakes to avoid a crash. PDF Section 7: Doubles and Triples - CDL Study Release Dolly breaks by opening the air tank petcock or if the dolly has a spring break, use the Dolly parking brake control . Be sure pintle-eye of dolly is in place in pintle hook of trailer(s). B. you can almost always stop more quickly than you can turn rear trailer. If you're only pulling one trailer, the shut off valves should always be closed or else the air will simply escape out the back of the trailer. driven with care to avoid losing control, Make sure the spare tire is secured, if it has one, Make sure the converter dolly air tank drain valve is closed, Make sure safety chains are secured to the trailers, All of the above. 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. This will supply air to the emergency (supply) lines. You are driving a 100 foot twin trailer combination at 50 mph. Should the pintle hook be latched or unlatched when backing a dolly under the second trailer? If it goes low enough, the trailer emergency brakes will come on. When driving a truck with more than one trailer, which trailer should be first behind the truck? A full trailer behind a truck You may be timed. 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? What's a converter dolly? Connect Converter Dolly to Front Trailer Back first semitrailer into position in front of dolly tongue. This has the same value as the %%SCORE%% Variable on the Final Screen. DOUBLE/TRIPLE CDL Flashcards | Chegg.com If the spring brakes do not release when you push the trailer air supply control, check the air line connections. D. Make sure the spare tire is secured, if it has one. When the road is slippery B. for doubles and triples, the fifth wheel should be all the way towards the tractor 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 loading fails, click here to try again. This means. You are driving a tractor with multiple trailers. 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. 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? When you go to the rear of the last trailer, what should you do to complete this check? For emergency braking you should: What will happen if there is a major leak in the service air line? When driving doubles or triples how should they be driven to avoid rollover or jackknifing: The converter dolly air tank drain valve on coupled double and triple trailers should be: Closed. Doubles and triples are extremely prone to control issues and must be Air escape from the open valve You are driving with double trailers and must use your brakes to avoid a crash. 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. Shut off valves are only used on trailers designed to be towed in conjunction with other trailers (doubles / triples). When you do this, you should hear: Ais escape from the open valve. What is the most common foundation brake found on heavy vehicles? For emergency braking you should: When checking the fifth wheel, you should make sure that it has enough? Which f these will result in the best control on curves? 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 _______. The road is dry and visibility is good. Which of the following must be connected when coupling tractor to trailer or trailer to trailer? Never pull any trailer without visually inspecting the fifth wheel locking bar 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. 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. Which is most likely to tip over: B Tips for Backing Up a Trailer Like a Pro Trucker. 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you are visually checking the coupling of a converter dolly to the rear trailer. When checking the coupling system, make sure that the locking jaws are around the shank of the. How can you test that air flows to all trailers? Which of these statements about managing space to the sides is true? The number and size of air tanks varies among vehicles. the crack-whip effect that triubkes trucks with trailers is most likely to cause a tip over when. which of these statements about quick steering movements and doubles/triples is true? Trailer Air Tanks And Shutoff Valves - Page 50. B. slightly open [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]. The dolly tow bar may flip up causing bodily injury and making it very difficult to These mirrors: Make things seem smaller and further away than they really are. 3. A. use a low gear What is one function of the tractor protection valve? A Open, latched B Open, free C Closed, latched D Closed, free 28. Watch the wording of the question AND the answers A safe driver will look for all of the above. open, closed, closed: Term. Types of converter dollies. with the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the trailer. converting it into two trailers, A coupling device of three or four axles and a fifth wheel by which a semitrailer can Pickup at South Loop. C Push the brake pedal as hard as you can and hold it there 2023 WV Doubles - Triples CDL Practice Test 1 - CristCDL.com 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? Any single vehicle with a GVWR of 26,001 or more pounds, or any such vehicle towing another not in excess of 10,000 pounds. Visually check to make sure that the lead trailer is slightly higher than the center of The converter dolly air tank drain valve on coupled double and triple trailers should be: A. open B. closed C. partially opened B When inspecting coupled doubles and triples, make sure the pintle hooks are: A. secured to the safety pins B. in the open position C. latched C Which of these is true? Flammable materials in the front trailer then it must have the placards on that trailer. The road is dry and visibility is good. Allow much more space than is needed for ideal driving condition. 1. Air escape from the open valve Good speed management says you should: You must drive through deep or flowing water. Study section 6.2 if you can't answer all of these questions. 5. Pintle-eye of dolly in place in pintle hook of trailer (s). A connection device of one axle used to disconnect a semitrailer combination vehicle If you feel Which trailer should come first behind the tractor? When driving with more than one trailer, which trailer should be the first one behind the tractor? It is important to check the height of the trailer before connecting a converter dolly to a trailer. Did you know you can fill out one quick form here on TruckingTruth and apply to several companies at once for paid CDL training? Their drawbars differentiate them. The dolly tow bar may fly up [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." 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. Dont hesitate to take advantage of our practice tests in each category specific to your needs. This has the same value as the %%TIME_USED%% Variable on the Final Screen. These trailers have no parking brake. Why should you check for when inspecting the converter dolly? What does the Commercial Driver Handbook say about how much space you should keep ahead of your truck? 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. What does the Driver's manual say about how much space you should keep ahead of your truck? 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. Make sure you have large enough gaps before entering or crossing traffic. You want to lock your combination to a second trailer that has no spring brakes. A What is a converter dolly? . recouple. Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front?