When driving a double or triple trailer, greater care must be given to. Air will not be available to release the trailer spring brakes (parking brakes). 0000010783 00000 n D D Doubles and triples are more likely to turn over than other combination vehicles because of what effect? A turn of the glad hand attached to the hose will join and lock the couplers. 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? For emergency braking you should: which of these statements about emergency steering is true? Calculate the voltage gain of each. Unlock the pintle hook only if the trailer it is under is loaded, otherwise the dolly tow bar may fly up, possibly causing injury and making it very difficult to re-couple. Park on level ground, put chock on the tires, and charge the air tank. Use only the trailer brakes Leave the emergency line shut-off valve closed and open the service line valve. In bad weather, slippery conditions and mountain driving, you must be especially careful if you drive double and triple bottoms. 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Join 50,000+ users around America to get your Commercial Driver License today! Safety chains secured to trailer (s). . B. releasing the pintle hook Hit the article below to see specific information about AOBRDs! 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. When the road is dry mTouch Quiz will automatically populate the fields below. Trailer Air Tanks And Shutoff Valves - Page 50. How do you know if your converter dolly is equipped with antilock brakes? The road is dry and the visibility is good. If there is a trailer behind the shut-off valve then they need to remain open. 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? Connect the Converter Dolly to the Rear Trailer: Test the coupling by pulling against the pin of the second semitrailer. D. Make sure the spare tire is secured, if it has one. 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. recouple. Connect Converter Dolly to Rear Trailer Make sure trailer brakes are locked and/or wheels chocked. Never, 9. b. cell Contributor: Luke Nold (Experienced truck driver for 5+ years and published writer for Fleet Magazine). What is a converter dolly? C "Glad hands" are coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer. Therefore, it is very important for safety that you use wheel chocks when you park trailers without spring brakes. 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. If a converter dolly is still under the second trailer and you unlock the pintle hook, what will probably happen? Feel Free to add additional fields for the Quiz Taker to complete using the "Add Fields" options to the right. However, converter dollies and trailers built before 1975 are not required to have spring brakes. Check them all. On double and triple combinations, you must make sure that which of these is secure? At section 2 downstream, the speed is 519 m/s. 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. A major leak in the emergency line will cause the tractor protection valve to close and the trailer emergency brakes to come on. None of the above, 2. Please wait while the activity loads. Opening the shut off valves on the rear most trailer will ensure the lines are flowing When you do this, you should hear: Which of the following must be connected when coupling tractor to trailer or trailer to trailer? C. 3, You are doing a walk around inspection of a double or triple trailer rig. Otherwise, the dolly tow bar may fly up, possibly causing injury and making it very difficult to re-couple. Doubles and triples take up more space than other commercial vehicles. Each trailer and converter dolly has one or more air tanks. You should NOT: You are driving a set of doubles and a set of trailer wheels goes into a skid. When only pulling one trailer, be sure the shut-off valves are all in the fully closed position. The lighter semitrailer should be in first position behind the tractor. 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. Learn more and apply here: TruckingTruth was founded by Brett Aquila (that's me! fumoto drain valve. C. back up slightly and make a visual check of the coupling, You are driving with double trailers and must use your brakes to avoid a crash. To do this without wheels chocks you should: Supply air to the trailer air system with the tractor and then disconnect the emergency line. you are doing a walkaround inspection of a double or triple trailer rig. 0000003060 00000 n A) one inch of space . kingpin, That there is grease between upper and lower fifth wheel. These dollies will have a yellow lamp on the left side of the dolly. coupled to the rear of a tractor-trailer combination forming a double bottom rig, Careful of the wording! 0000010306 00000 n If you feel When uncoupling a rear trailer, your rig should be parked in a straight line on? Learn more and apply here: The more heavily loaded semitrailer should be in first position behind the tractor. You must steer gently when pulling trailers. In double and triple trailers, the trailer air supply control should pop or _________ when air pressure drops into the range of 20 to 45 psi. The emergency line valve open and release air C Like a trailer, a dolly equipped with ABS will have a yellow indicator light on the left side. C. slow to a safe speed before entering the curve, then coast through it, Which of these is NOT a good thing to do when driving on slippery roads? Which of these is the correct answer? Doubles and triples are extremely prone to control issues and must be B. keep gentle pressure on the brakes while going through the water and for a short distance after coming out You should be sure the converter dolly air tank . When testing trailer service brakes, you should use? The couplers have a rubber seal that prevents air from escaping. you are driving at night and you must dim your headlights for traffic. High Road 2.0! The Doubles and Triples written CDL Exam is required for your doubles and triples endorsement. How can you be sure you supplied air to a second trailer? 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. 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. The converter dolly is an auxiliary axle with a coupling device. The final procedure when connecting a rear trailer is to? rear trailer. Open. Then, the air loss from the leak will lower the air tank pressure quickly. Doubles and triples are more likely to overturn than other combination vehicles because of the whip cracking effect. True or False? Related Question Question: What does this sign mean? 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. dress gifs. When you do this, you should hear: Ais escape from the open valve. Try our free CDL Doubles and Triples Test Question and Answers Quiz online. Which of the following is true about loading cargo into double or triple trailers? Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? When connecting a converter dolly to a rear trailer, the trailer height must be adjusted so that it is? Take special care when pulling two and three trailers. It is very important to keep the air supply clean. B Converter dolly air tank drain valve: CLOSED. View More Details. True! Open the emergency line shut-off valve at the rear of the last trailer. Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? 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! All other trailer air functions use the emergency line. Did you know you can fill out one quick form here on TruckingTruth and apply to several companies at once for paid CDL training? D which of these statements about quick steering movements and doubles/triples is true? There is no requirement or exact standard for color coding. When coupling, be sure to couple the proper glad hands together. Pintle-eye of dolly in place in pintle hook of trailer (s). You should NOT: Use the engine brake or speed retarder. All of the above, 6. The driver must yield the right-of-way to other vehicles when merging and when entering a highway from an alley. Which of the following will occur? [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]. Always unlock the pintle hook with the dolly still under the rear trailer. The crack the whip effect will topple the rear trailer first. Time used (Requires timer add on). None But the brakes will hold only as long as there is air pressure in the trailer air tank. You will not be tested on uncoupling twins unless you want to get a double/triple trailer endorsement on your license. Which of these statements about managing space to the sides is true? weather passes. Slow to the safe speed before entering, then accelerate slightly through the curve. Any trailer, 7. Safety should never take second place, so know your stuff! You are driving with double trailers and must use your brakes to avoid a crash. A. closed; latched 2) the second test is to go out to the trailer to ensure that the parking brakes have indeed applied. 3. When driving with more than one trailer, which trailer should be the first one behind the tractor? A thorough pre-trip inspection should catch any major service line leaks before you begin your trip. None of the above, 5. 0000007508 00000 n There are more critical parts to check when you have two or three trailers. Speed for other vehicles is often too fast for a multi-combination unit! When you do this, you should hear: Which of these statements about emergency steering is true? Stay up to date on truck driving industry news. Should the shut-off valves on the trailers be open or closed on a set of double trailers? The shortest trailer 0000004689 00000 n 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. 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 _____. B. slightly raised 0000006836 00000 n NPT thumbscrew style design enables easy installation. 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. With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. If there is air there, then there is air towards the cab You want to hook up to the first trailer, then the converter dolly while it is lined up in you are driving a set of doubles and a set of trailer wheels goes in a skid. Doubles and triples are more likely to turn over than other combination vehicles because of the "crack- the-whip" effect. True! Before coupling a trailer, you should make sure it is at the right height using? What three methods can you use to secure a second trailer before coupling? Many scientists are concerned that the melting of Earth's sea ice will increase Earth's surface temperature. which of these is not a good thing to do when driving on slippery roads? You should be sure the converter dolly air tank drain valves are _____ and the pintle hook is ____. 5. Never unlock the pintle hook with the dolly still under the rear trailer. 0000001107 00000 n 0000003998 00000 n Also, this page requires javascript. Air Storage and Drain Tanks: Air storage tanks are used to hold compressed air. If youre reading this, youre probably asking yourself, Should I Read More, One aspect of living as a truck driver is that you are constantly away from home and have to purchase all your meals on the road. A. countersteer Make sure pintle hook is latched. Secure converter gear support in raised position. Explore now! They are filled by the emergency (supply) line from the tractor. A. require shorter stopping distances than full ones You wish to turn right from one two-lane, two-way street to another. In order to receive your Doubles and Triples endorsement, it is required that you pass the states official CDL written Knowledge exam. What three methods can you use to secure a second trailer before coupling? What should you check for when inspecting the converter dolly? B. johnson bar If it goes low enough, the trailer emergency brakes will come on. A. release the spring brakes and check for movement Any trailer with a reduced ground clearance Either the front or the rear brakes will not work properly or fully. When turning a double or triple at an intersection, the turn often cannot be completed without swinging wide. Because of this, which of the following vehicle parts is most likely to tip over? 0000010705 00000 n How much space should be between the upper and lower fifth wheel? kingpin. D 3. You are driving a tractor with multiple trailers. Sketch the shape of the passage between sections 1 and 2. axle will have spring brakes due to the weight of the unit. Question 4. Mar 2 - Mar 3. There is no obligation whatsoever. Therefore, look far ahead so you can slow down or change lanes gradually when necessary. If this activity does not load, try refreshing your browser. Their drawbars differentiate them. You should be sure the converter dolly air tank drain valves are _____ and the pintle hook is _____. how can you be sure you supplied air to a second trailer? You are doing a walkaround inspection of a double or triple trailer rig. By clicking on "Sign Up", you agree to our Terms of Use and Privacy Policy. B. open; latched How much space should be between the upper and lower fifth wheels? Eventually, the air will leak away, and then there will be no brakes. D We are here to help. How many different ways of coupling and uncoupling trailer combinations are there? Typically depends on the axle count. HlTo xGf`{iIMh-x||?pbE':X4ZZZRbu7 uvi_RHUkVXBVu{^B3 4e/iw\]RE] YY7i)e V*h(++WQ-]Xm9c5yU6BS" 5HiL,[b)ee:t/ )%BVGpU7T\ZJD Air flows steadily and isentropically through a passage. Ideal for replacing a worn, leaky drain valve on a compressor. A. make things look smaller and farther away than they really are 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: To check air flows to all trailers, you should let air pressure reach normal then? Be certain you are clear at the sides before changing lanes. Once that's complete, then its an easy push back and the 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. Do converter dollies have spring brakes? Should the converter dolly air-tank drain valve be open or closed on a double trailer combination? Make sure you have large enough gaps before entering or crossing traffic. what is likely to happen if the pintle hook is unlocked with the dolly still under the second trailer? Locking jaws closed on Refers to pulling two trailers at the same time, otherwise known as "pups" or "pup trailers" because they're only about 28 feet long. For all brakes to work on a triple combination, you must have air supply? What is likely to happen? Light cords firmly in sockets on trailer. how much space should be between the upper and lower fifth wheel? Stop the vehicle by gearing down and sparingly Hb```f``b`c``e@ (Q6_* your vehicle is so long that you must swing wide to make a turn. 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. You should be sure the converter dolly air tank drain valves are _______ and the pintle hook is _____. Take this same test in our other testing modes How to Get a Hazardous Materials Endorsement, What is a CDL? For emergency braking you should: Which is most likely to tip over: Seriously! Which is most likely to tip over: good speed management says you should, may have poor traction due to bouncing and wheel lock up. A. opening the air tank petcock The front trailer in a set of double trailers is most likely to turn over due to the Crack-the-Whip effect. This will let the rear wheels roll again and keep the rear wheels from sliding. You will speak with recruiters today. You are driving a 100-feet truck with double trailers at 50 mph. which of these statements about managing space to the sides is true? If you are only pulling one trailer, make certain the valve is fully in the closed position or it will leak air out of the air system. You should be sure the converter dolly air tank drain . The lighter trailer should be in the rear. 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. 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. the rig will continue moving in a straight line no matter how much the steering wheel is turned. Converter dollies are connected to front trailers with a? 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. 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 A. air escape from the open valve 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. 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. All rights reserved Site Map. 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. A 0000006383 00000 n Safety chains should be secured to trailer(s). You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. allow "much more space than is needed for ideal driving conditions". 1. There are two types of converter dollies. 21 0 obj << /Linearized 1 /O 23 /H [ 1162 213 ] /L 29759 /E 11109 /N 7 /T 29221 >> endobj xref 21 38 0000000016 00000 n A Question 3 Explanation: All of the above. A safe speed on a curve for a straight truck or a single trailer combination vehicle may be too fast for a set of doubles or triples. The rear trailers shut-off valves should be open and the front closed. Pull gently against them in a low gear to make sure the brakes work. The shut off valves prevent air from going any further. 0000002636 00000 n Close the emergency line shut-off valve at the rear of the trailer. A) closed . 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. True! open, closed, closed: Term. should remain in the closed position. The application only takes one minute. B When checking the fifth wheel, you should make sure that it has enough? When entering a roundabout, a driver must yield the right-of-way to drivers already in the roundabout and obey all traffic signs. You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. 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. 8. When uncoupling a rear trailer, you should remove some weight from the dolly by? The tanks will hold enough air to allow the brakes to be used several times even if the compressor stops working. If you are driving a 200-foot triple at 35 mph, what is the minimum amount of space (in seconds) that you should keep ahead of you? Air escape from the open valve You are driving with double trailers and must use your brakes to avoid a crash. This has the same value as the %%PERCENTAGE%% Variable on the Final Screen. You should reduce your speed by about _____ on a wet road. All material on this website is copyrighted. B On a triple combination, the shutoff valves on the rear of the last trailer should be? 0000001956 00000 n What is a converter dolly? These mirrors: To test the tractor protection valve, charge the trailer air brake system, turn off the engine, and Open, free CDL License Requirements State By State. To do this without wheel chocks you should: Empty trucks: When parking your double or triple combination, you should look for a parking space securely fastened. The road is dry and visibility is good. Doubles and triples must be driven very smoothly to avoid rollover or jackknife. 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: can and will get stuck on a raised railroad crossing. Provides a snug fit to eliminate unwanted seepage of air or water. C A major leak in the emergency line will cause the tractor protection valve to close and the trailer emergency brakes to come on. B. you should avoid traveling next to others whenever possible A vehicle transporting hazardous materials is required to display placards where? ADVERTISEMENT ADVERTISEMENT Allow more following distance. Seriously! 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: A dolly has lights, air tanks, air relays, air lines, air brakes, ABS, electrical connections, etc. B. use only the trailer brakes When connecting the glad hands, press the two seals together with the couplers at a 90-degree angle to each other. 12, 3. Open the emergency line shut-off valve at the rear of the last trailer. a. blood The heaviest trailer Also available in App Store & Google Play. Which of these statements about quick steering movements and doubles/triples is true? None of the above, 4. You may be timed. What will happen if there is a major leak in the service air line? A TestPermit.com provides free unofficial review materials for a variety of exams. B. closed 0000007487 00000 n A. for coupled doubles and triples, be sure that the pintle hook is in the open position If you want to couple a second trailer to your combination vehicle, secure it by using: The crack-the-whip effect that troubles trucks with trailers is most likely to cause a tip over: You are driving on a slippery road during the day. When uncoupling, you should never unlock the _______ with the dolly still under the rear trailer. B 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 You should hear air escaping, showing the entire system is charged. Be sure pintle-eye of dolly is in place in pintle hook of trailer(s). The road is dry and the visibility is good. The road is dry and visibility is good. Time limit varies by state. 0000004668 00000 n 0000005664 00000 n A. fully lowered On a triple combination, the shutoff valves at the rear off the middle trailer should be? 0000003977 00000 n This will supply air to the emergency (supply) lines. How do you check to make sure trailer height is correct before coupling? The converter dolly air tank drain valve on coupled double and triple trailers should be: Closed. B. keep other traffic out of your side space Delivering to. At TruckingTruth we'll help you decide if trucking is right for you and help you get your career off to a great start. Closed, latched A. open When driving a truck with more than one trailer, which trailer should be first behind the truck? A 360 degree area of awareness is Submit your email at the end of the test. Locking jaws open This would be very dangerous. If you do, there is a problem. A connection device of one axle used to disconnect a semitrailer combination vehicle Do converter dollies have spring brakes? front of the second trailer. You are driving with double trailers and must use your brakes to avoid a crash. 0000003240 00000 n When does the "driver's manual" advise disconnecting the steering axle brakes to help
