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. All of the above, 6. You should be sure the converter dolly air tank drain valves are _____ and the pintle hook is _____. 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. 0000005554 00000 n What happens when there is a major leak in the emergency air 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? Correct answer percentage. 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? 0000004689 00000 n HlTo xGf`{iIMh-x||?pbE':X4ZZZRbu7 uvi_RHUkVXBVu{^B3 4e/iw\]RE] YY7i)e V*h(++WQ-]Xm9c5yU6BS" 5HiL,[b)ee:t/ )%BVGpU7T\ZJD Any vehicle, regardless of size, designed to transport 16 or more persons, including the driver. Use only the trailer brakes a. blood The heavier trailer should be in the rear. 9. Safety chains secured to trailer (s). 0000010783 00000 n When you do this, you should hear: you are driving with double trailer and must use your brakes to avoid a crash. 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. 1/2 to 3/4 of an inch symptoms of a bad fuel tank selector switch. should remain in the closed position. Which of the following will occur? 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. B. slow to a safe speed before entering the curve, then accelerate slightly through it Slow to the safe speed before entering, then accelerate slightly through the curve. B. closed You will speak with recruiters today. If you crossed the air lines, you could drive away, but you would not have trailer brakes. 0000001375 00000 n You are driving with double trailers and must use your brakes to avoid a crash. A. use light, steady pressure on the brake pedal In order to receive your Doubles and Triples endorsement, it is required that you pass the state's official CDL written Knowledge exam. some large trucks have curved (convex or spot) mirrors. A B You are driving with more than one trailer. you are driving a set of doubles and a set of trailer wheels goes in a skid. Nothing, the weight of the trailer will keep it in place, 10. Please use the form below to contact our customer service or sales team. 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 can hear air escaping with the valve closed. C. use controlled or stab braking, The best way to stop any skid is to: If there is Never unlock the pintle hook with the dolly still under the rear trailer. Be more careful in adverse conditions. Make sure pintle hook is latched. if you have traffic on both sides of your vehicle and something is blocking your lane, a move to the right still be best. When uncoupling a rear trailer, your rig should be parked in a straight line on? A. hand valve A vehicle transporting hazardous materials is required to display placards where? mTouch Quiz will automatically populate the fields below. To do this without wheels chocks you should: Supply air to the trailer air system with the tractor and then disconnect the emergency line. Email Updates When New Articles Are Posted. There is no requirement or exact standard for color coding. 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. A. require shorter stopping distances than full ones 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. The tanks will hold enough air to allow the brakes to be used several times even if the compressor stops working. 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. That split second that you release the brakes will allow them to match the vehicles road how can you be sure you supplied air to a second trailer? 0000008166 00000 n 9 B. keep gentle pressure on the brakes while going through the water and for a short distance after coming out Air pressure is sent from the air tanks to the brakes by relay valves. There is no obligation whatsoever. How can you be sure you supplied air to a second trailer? A. you can steer more quickly and safely if you hold the wheel with one hand A dolly should be pulled out from a rear trailer using? Hazardous materials must be placarded on all four sides of EACH Trailer. fifth wheel, so trailer is raised slightly when dolly is pushed under it. You will not be tested on uncoupling twins unless you want to get a double/triple trailer endorsement on your license. C. 3, You are doing a walk around inspection of a double or triple trailer rig. The braking systems of double and triple trailers are different than those of straight trucks because doubles and triples. A. air escape from the open valve Which is most likely to tip over: Secure converter gear support in raised position. will have a lamp on the drivers side. 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. You are driving a triple trailer and there is a loss of air pressure in the emergency line. The emergency line valve open and release air The pintle hook should always be secure when the vehicle is in motion. you are visually checking the coupling of a converter dolly to the rear trailer. A bent or damaged kingpin on a coupling should be? 1. If the dolly is a two axle unit then 1 What types of trailers can get stuck on raised crossings? Ship to Store. You open the emergency line shut-off valve at the rear of the last trailer and hear air escaping. You want to lock your combination to a second trailer that has no spring brakes. 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. 0000003977 00000 n axle will have spring brakes due to the weight of the unit. 0000001956 00000 n Submit your email at the end of the test. TestPermit.com provides free unofficial review materials for a variety of exams. B. open; latched For emergency braking you should: You are doing a walk around inspection of a double or triple trailer rig. Did you know you can fill out one quick form here on TruckingTruth and apply to several companies at once for paid CDL training? Our normal business hours are Monday-Friday 8 a.m. to 5 p.m. (Pacific Time). Eventually, the air will leak away, and then there will be no brakes. Delivering to. 0000008894 00000 n Should the pintle hook be latched or unlatched when backing a dolly under the second trailer? The dolly tow bar may fly up, possibly causing injury, and making it very difficult to The pressure in the service line tells how much pressure the relay valves should send to the trailer brakes. The dolly tow bar may fly up C unsafe slow down even further, or better yet, find a safe haven and park until the Which the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the trailer. - Converter dolly air tank drain valve: CLOSED. open, closed, closed: Term. All rights reserved 2022 TestPermit.com, CDL Doubles and Triples Test Question and Answers, Divided Highway Sign: Meaning, Quiz Definition, Example, Shape, Location, Color, Narrow Bridge Sign: Meaning, Quiz Definition, Example, Shape, Location, Color, STOP Sign 2023 Meaning, Quiz Definition, Example, Shape, Location, Color, Crossbuck Sign: Meaning, Definition, Example, Shape, Location, Color, Georgia CDL Permit Practice Test 2023 Study Guide [PDF], Georgia Motorcycle Permit Test 2023 with Study Guide [PDF], Georgia Permit Test 2023 (DDS Practice Test UPDATED), Georgia ADAP Practice Test 2023 Questions Answers Online, Ohio CDL Permit Practice Test 2023 Study Guide [PDF], Ohio Motorcycle Permit Test 2023 Study Guide [PDF]. What do you check when making a visual check of coupling? Use the engine brake or speed retarder. 0000010285 00000 n The service brakes slowly move to the fully applied position B. are the easiest to stop since there is no shifting cargo The lightest trailer They provide the air pressure used to operate trailer brakes. 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. Like a trailer, a dolly equipped with ABS will have a yellow indicator light on the left side. 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 have not finished your quiz. Take this same test in our other testing modes How to Get a Hazardous Materials Endorsement, What is a CDL? On double and triple combinations, you must make sure that which of these is secure? rear brakes will not work properly. With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. Opening the shut off valves on the rear most trailer will ensure the lines are flowing Make a sketch that explains this phenomenon in terms of a feedback loop . 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. What does the Driver's manual say about how much space you should keep ahead of your truck? For emergency braking you should: 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 When you do this, you should hear: Which of these statements about emergency steering is true? Simply click in your answer to each CDL practice test question. A-dolly. This has the same value as the %%TIME_ALLOWED%% Variable on the Final Screen. When the road is slippery You should NOT: when testing the coupling of a double trailer the landing gears of the rear trailer should be, you must drive through deep or flowing water . Blue is used for the service lines, and red for the emergency (supply) lines. We have a new version of this program. All rights reserved Site Map. Why is there still destructive interference? There is a school zone ahead. Safety should never take second place, so know your stuff! B. the emergency line valve open and release air What happens if you cross the Emergency Air Line and the Service Air Line? allow "much more space than is needed for ideal driving conditions". How do you check to make sure the trailer height is correct before coupling? Converter dolly air tank drain valve: CLOSED. 0000003998 00000 n 11 The coupling between a rear trailer and a dolly should have a space between the upper and lower fifth wheels of? [California Commercial Driver Handbook] The weight of a truck: Is a major factor affecting stopping distance. 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. When driving a truck with more than one trailer, which trailer should be first behind the truck? Remember, the service line is not used unless you depress the brake pedal or use the trailer hand valve. C. drive through quickly, With the hand valve on, you should test the trailer brakes by opening the service valve line at the rear of the rig. 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: which of these statements about quick steering movements and doubles/triples is true? When coupling twin trailers, a converter dolly is. Use controlled or stab braking This means. Which of these statements about managing space to the sides is true? securely fastened. Please wait while the activity loads. With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. C you are driving a 100ft truck eith double trailers at 50mph. The lighter semitrailer should be in first position behind the tractor. C Any trailer with a reduced ground clearance 0000002446 00000 n This will supply air to the emergency (supply) lines. 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. not have spring brakes. Push the brake pedal as hard as you can and hold it there 0000006015 00000 n Locking jaws closed on Driving doubles/triples is also more dangerous in hot and cold weather driving, as well as on mountain roads. ), a 15 year truck driving veteran, in January 2007. You are doing a walkaround inspection of a double or triple trailer rig. 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. When checking the coupling system, make sure that the locking jaws are around the shank of 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. 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! The emergency brakes come on whenever the air supply knob is pulled out or the trailer is disconnected. D This has the same value as the %%TOTAL%% Variable on the Final Screen. D 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. Connect the Converter Dolly to the Rear Trailer: Test the coupling by pulling against the pin of the second semitrailer. These mirrors: Make things seem smaller and further away than they really are. In the coupling system, the locking jaws should be fixed around? 3. You should be sure the converter dolly air tank drain valves are _____ and the pintle hook is ____. 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. If the spring brakes do not release when you push the trailer air supply control, check the air line connections. Park the rear trailer against another trailer, chock the tires and lock the trailer trailer << /Size 59 /Info 20 0 R /Root 22 0 R /Prev 29211 /ID[] >> startxref 0 %%EOF 22 0 obj << /Type /Catalog /Pages 19 0 R >> endobj 57 0 obj << /S 66 /Filter /FlateDecode /Length 58 0 R >> stream Make sure you do not get in a spot you cannot pull straight through. Antilock Braking Systems on Converter Dollies, Converter dollies built on or after March 1, 1998, are required to have antilock brakes. At section 2 downstream, the speed is 519 m/s. 0000009577 00000 n True! The last trailer in a combination is most likely to turn over. These valves permit closing the air lines off when another trailer is not being towed. 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? Pull gently against the pin of the second trailer. B The road is dry and visibility is good. D Sketch the shape of the passage between sections 1 and 2. There are more things that can go wrong, and doubles/triples are less stable than other commercial vehicles. converting it into two trailers, A coupling device of three or four axles and a fifth wheel by which a semitrailer can How many different ways of coupling and uncoupling trailer combinations are there? inspection of all equipment. When uncoupling, you should never unlock the _______ with the dolly still under the rear trailer. 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. When you're finished, check your score and results. For emergency braking you should: When checking the fifth wheel, you should make sure that it has enough? 4. A 60607. 0000005664 00000 n When does the Driver's manual say you should disable the steering axle brake? How much space should be between the upper and lower fifth wheel? D 5. Make sure the converter dolly air tank drain valve is closed. Question 4. Take special care when pulling two and three trailers. What is a converter dolly? B. johnson bar This will let the rear wheels roll again and keep the rear wheels from sliding. A. make things look smaller and farther away than they really are Allow much more space than is needed for ideal driving condition. Typically depends on the axle count. On the first trailer in a set of doubles? Refers to pulling two trailers at the same time, otherwise known as "pups" or "pup trailers" because they're only about 28 feet long. If this activity does not load, try refreshing your browser. You may be timed. The road is dry, and visibility is good. Therefor, if there is a major leak in your service line, you may not know it until you try to use the service brake. How should you test the coupling? your vehicle is so long that you must swing wide to make a turn. Therefore, look far ahead so you can slow down or change lanes gradually when necessary. That there is no space between upper and lower fifth wheel. Stay up to date on truck driving industry news. D Also available in App Store & Google Play. In bad weather, slippery conditions and mountain driving, you must be especially careful if you drive double and triple bottoms. When you go to the rear of the last trailer, what should you do to complete this check? Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? 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. 1/32 to 3/32 of an inch. If spare tire is on converter gear (dolly), make sure it is secured. Locking jaws open Any items you have not completed will be marked incorrect. 0000001162 00000 n C The trailer height is right when: The trailer will be raised slightly when the converter dolly is backed under it. The puzzle: At the far left edge, the plates are in contact, so the path length difference between rays 222 and 333 is zero. All other trailer air functions use the emergency line. Should the shut-off valves on the trailers be open or closed on a set of double trailers? The rear trailers shut-off valves should be open and the front closed. What three methods can you use to secure a second trailer before coupling? 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. (done) Chp 23: Cash Flow + Working Capital, Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer. D which of these statements about managing space to the sides is true? 2 These dollies will have a yellow lamp on the left side of the dolly. Once that's complete, then its an easy push back and the Each tank has a drain valve on it, and you should drain each tank every day. Which of the following statements about off tracking is true? Air pressure is sent from the air tanks to the brakes by relay valves. B Release Dolly breaks by opening the air tank petcock or if the dolly has a spring break, use the Dolly parking brake control . Each trailer and converter dolly has one or more air tanks. Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? Please visit using a browser with javascript enabled. They are filled by the emergency (supply) line from the tractor. 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). You should NOT: You are driving a set of doubles and a set of trailer wheels goes into a skid. 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. Lock pintle hook. Visually check to make sure that the lead trailer is slightly higher than the center of If you're pulling more than one trailer, all valves should be open except the very last trailer, which should have all valves in the closed position. The converter dolly is an auxiliary axle with a coupling device. All trademarks are property of their respective owners. When only pulling one trailer, be sure the shut-off valves are all in the fully closed position. When you do this, you should hear: Ais escape from the open valve. kingpin, That there is grease between upper and lower fifth wheel. The dolly tow bar may flip up causing bodily injury and making it very difficult to