the converter dolly air tank drain valve should be the converter dolly air tank drain valve should be

Take this same test in our other testing modes How to Get a Hazardous Materials Endorsement, What is a CDL? Single axle converter dollies are the most common type of converter dolly used in the U.S. C-dolly The C-dolly has two separate couplings, side-by-side. A 0000009577 00000 n Any trailer, 7. For emergency braking you should: May have poor traction due to bouncing and wheels lockup. 0000010705 00000 n 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. B. you should avoid traveling next to others whenever possible front of the second trailer. You should be sure the converter dolly air tank drain valves are _____ and the pintle hook is _____. Which of the following will probably happen if you are driving a double rig and a set of trailer wheels goes into a skid? You should hear air escaping, showing the entire system is charged. how much space should be between the upper and lower fifth wheel? A Air pressure is sent from the air tanks to the brakes by relay valves. None of the above, 4. The pressure in the service line tells how much pressure the relay valves should send to the trailer brakes. Typically depends on the axle count. 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. All of the above, 6. 0000003261 00000 n By clicking on "Sign Up", you agree to our Terms of Use and Privacy Policy. That there is no space between upper and lower sixth wheel. 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? Have little braking power because they are small Opening the shut off valves on the rear most trailer will ensure the lines are flowing Did you know you can fill out one quick form here on TruckingTruth and apply to several companies at once for paid CDL training? The dolly tow bar may fly away, possibly causing panic, and making it very difficult Double and triple trailers increase not only the operators risk of safety, but also the other motorists around him. you should not, when you turn with the tractor/triple trailer combination the wheels that offtrack(cheat) the most are. utilize the brakes. When does the Driver's manual say you should disable the steering axle brake? You can also reach us at (888) 830-2326. 0000006383 00000 n . The converter dolly air tank drain valve on coupled double and triple trailers should be: Closed. Use the engine brake or speed retarder. 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? How do you know if your converter dolly is equipped with antilock brakes? Go to the rear of the rig. Feel Free to add additional fields for the Quiz Taker to complete using the "Add Fields" options to the right. The road is dry and visibility is good. To do this without wheels chocks you should: Supply air to the trailer air system with the tractor and then disconnect the emergency line. Time limit varies by state. While inspecting your converter dolly coupling, you should make sure there is _______ between the upper and lower fifth wheel. B. releasing the pintle hook Once that's complete, then its an easy push back and the 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. 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. When uncoupling a rear trailer, your rig should be parked in a straight line on? Page 7-6 Commercial Driver's Manual/2.0 = Be sure air lines are supported and glad hands are properly connected. Which trailer should come first behind the tractor? The crack the whip effect will topple the rear trailer first. 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. All ABS equipped units Ship to Store. 0000006195 00000 n You should look into the back of the fifth wheel on a dolly to see if it is locked onto the kingpin, A safe speed on a curve for a straight truck or a single trailer combination vehicle may be too fast for double or triple trailers. air throughout the system. Dont hesitate to take advantage of our practice tests in each category specific to your needs. 0000008894 00000 n C. closed; unlatched, Which of these will result in the best control on a curve? . When the road is slippery The trailer height is right when: The trailer will be raised slightly when the converter dolly is backed under it. If one air system is very low on pressure _______. the trailer height is right when: the trailer will be raised slightly when the converter dolly is backed under it. 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. By using this site, you agree to be bound by our Terms of Use, Privacy Policy and Cookie Policy, Copyright 2000-2023 MH Sub I, LLC dba Internet Brands. This is CDL Doubles and Triples Test 3in our original Classic Mode. A sudden movement with the steering wheel can result in a tipping over rear trailer. The dolly tow bar may fly up, possibly causing injury and making it very difficult to re-couple. then there is a problem with the ABS system. you should avoid traveling next to others when possible. Mar 2 - Mar 3. A full trailer behind a truck 4. 0000007508 00000 n D A. completely open At section 1, where the cross-sectional area is 0.02 m2m^{2}m2, the air is at 40.0 kPa (abs), 60C60^{\circ} \mathrm{C}60C, and M=2.0. Many scientists are concerned that the melting of Earth's sea ice will increase Earth's surface temperature. Safety should never take second place, so know your stuff! on kingpin. When you do this, you should hear: you are driving with double trailer and must use your brakes to avoid a crash. When uncoupling doubles or triples, what is important to know about unlocking the pintle hook? If it goes low enough, the trailer emergency brakes will come on. Compressed air usually has some water and some compressor oil in it. Release Dolly breaks by opening the air tank petcock or if the dolly has a spring break, use the Dolly parking brake control . If the converter dolly is close to your semitrailer, you should wheel it into position? Be sure air-lines are supported and glad hands are properly connected. Driving doubles/triples is also more dangerous in hot and cold weather driving, as well as on mountain roads. the rig will continue moving in a straight line no matter how much the steering wheel is turned. 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. Air flows steadily and isentropically through a passage. B What is a converter dolly? When you do this, you should hear: Which of these statements about emergency steering is true? S-cam brakes are the most common style brakes on large trucks today. A good and safe driver will always look out for ______. Should the shut-off valves on the trailers be open or closed on a set of double trailers? Always test the trailer brakes before driving with the hand valve or by pulling the air supply (tractor protection valve) control. Which of the following is true about loading cargo into double or triple trailers? You must check that all shut-off valves are in the open position except the ones at the back of the last trailer, which must be closed. New! It is very important to keep the air supply clean. They provide the air pressure used to operate trailer brakes. Doubles and triples must be driven very smoothly to avoid rollover or jackknife. you should check the trailer height before connecting a converter dolly to a second or third trailer. [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]. to do this without wheel chocks you should: supply air to the trailer air system with the tractor and then disconnect the emergency line. When does the "driver's manual" advise disconnecting the steering axle brakes to help A A low air buzzer will go off indicating something is wrong and either the front or the There is no obligation whatsoever. What three methods can you use to secure a second trailer before coupling? 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. D. Make sure the spare tire is secured, if it has one. The A-dolly has a single drawbar with a single, centered hitching point. The shortest trailer You shouldn't stop braking. C. engaging the tractor valve protection control, You must drive through deep or flowing water. These mirrors: make things seem smaller & further away then they really are. 0000005733 00000 n A vehicle transporting hazardous materials is required to display placards where? A You can reset the test and retake it as needed. We are an independent company focused on providing valuable motor vehicle and permit practice test information. The front trailer in a set of double trailers is most likely to turn over due to the Crack-the-Whip effect. Doubles/triples flip flop over from quick steering moves more easily than many vehicles. Should the pintle hook be latched or unlatched when backing a dolly under the second trailer? That split second that you release the brakes will allow them to match the vehicles road You should keep at least ____ seconds of space ahead of you. Sketch the shape of the passage between sections 1 and 2. The converter dolly air tank drain valve on coupled double/triple trailers should be: Closed. When you do this, you should hear: Ais escape from the open valve. The rear trailers shut off valves should be closed and the front open to allow air to the King pin. B. do not need to be checked as often as flat mirrors because they show a larger area You are driving with double trailers and must use your brakes to avoid a crash. In a certain electronic device, a three-stage amplifier is desired, whose overall voltage gain is 42 dB. You should check the height of the trailer before connecting a converter dolly to a second or third trailer. True or False? 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. To do this without wheel chocks you should: Empty trucks: When parking your double or triple combination, you should look for a parking space you are driving a set of doubles and a set of trailer wheels goes in a skid. They are filled by the emergency (supply) line from the tractor. The coupling between a rear trailer and a dolly should have a space between the upper and lower fifth wheels of? Open, free when driving a truck with more than one trailer, which trailer should be first behind the truck? 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. The road is dry and visibility is good. Some large trucks have curved (convex or spot) mirrors. C. closed, You can release the dolly brakes by: When driving a truck with more than one trailer, which trailer should be first behind the truck? This has the same value as the %%TIME_USED%% Variable on the Final Screen. For emergency braking you should: A Push the brake pedal as hard as you can and hold it there B you want to hook your combination to a second trailer that has no spring brakes. B Each trailer and converter dolly has one or more air tanks. What value of channel width must the design use? paramount to safe driving. On the middle trailer of a set of triples? The application only takes one minute. Only trailers designed to be pulled with another trailer behind it will have a shut off valve. ), a 15 year truck driving veteran, in January 2007. The shut off valves, when in the open position, allows air to flow out to another trailer. B. closed You may not notice a major leak in the service line until you try to put the brakes on. A 12, 3. Seriously! What is the most common foundation brake found on heavy vehicles? You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. You are driving a 100 foot twin trailer combination at 50 mph. Nothing, the weight of the trailer will keep it in place, 10. 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. When the road is dry With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. Speed for other vehicles is often too fast for a multi-combination unit! 11 A major leak in the emergency line will cause the tractor protection valve to close and the trailer emergency brakes to come on. If this activity does not load, try refreshing your browser. Either the front or the rear brakes will not work properly or fully. B. Shut off valves are only used on trailers designed to be towed in conjunction with other trailers (doubles / triples). Light cords firmly in sockets on trailer. Also, this page requires javascript. You should reduce your speed by about _____ on a wet road. what is likely to happen if the pintle hook is unlocked with the dolly still under the second trailer? door. If the spring brakes do not release when you push the trailer air supply control, check the air line connections. They are filled by the emergency (supply) line from the tractor. Wait for air pressure to reach normal, then push in the red trailer air supply knob. "Glad hands" are coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer. 5. When uncoupling a rear trailer, you should remove some weight from the dolly by? D What happens if you cross the Emergency Air Line and the Service Air Line? Which is most likely to tip over: For emergency braking you should: Use controlled or stab braking Converter dollies: Often do not have spring brakes The crack the whip effect that troubles trucks with trailers. Connect Converter Dolly to Front Trailer Back first semitrailer into position in front of dolly tongue. C converting it into two trailers, A coupling device of three or four axles and a fifth wheel by which a semitrailer can 0000002636 00000 n Calculate the voltage gain of each. The heavier trailer should be in the rear. It depends on the load rear brakes will not work properly. A. require shorter stopping distances than full ones 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? B. for doubles and triples, the fifth wheel should be all the way towards the tractor You are driving a tractor with multiple trailers. This would be very dangerous. Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? You should NOT: 6. At section 2 downstream, the speed is 519 m/s. B. slow to a safe speed before entering the curve, then accelerate slightly through it When does the "driver's manual" advise disconnecting the steering axle brakes to help keep the rig straight? The weight of the individual trailers will have no noticeable effect on the handling of the vehicle, The weight of all trailers should be nearly the same, within 2% of each other. 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 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? Your vehicle is so long that you must swing wide to make the turn. True False True If you want to couple a second trailer to you combiantion vehicle, secure it by using the: Trailer emergency air brakes. CDL License Requirements State By State. The number and size of air tanks varies among vehicles. Clean the couplers and rubber seals before a connection is made. C 1/32 to 3/32 of an inch. Secure converter gear support in raised position. [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." When turning a double or triple at an intersection, the turn often cannot be completed without swinging wide. What happens when there is a major leak in the emergency air line? Try our free CDL Doubles and Triples Test Question and Answers Quiz online. View the full article to see how to set cruise control correctly! When coupling, be sure to couple the proper glad hands together. A. use the engine brake or speed retarder If you have traffic on both sides of your vehicle and something is blocking your lane, a move to the right still be best. If your tractor protection valve doesn't work properly, then if an air hose starts to leak what could happen? If loading fails, click here to try again. 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. 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. Which of these is most likely to occur? Each trailer and converter dolly has one or more air tanks. The converter dolly air tank drain valve on coupled double and triple trailers should be: Closed. Some areas of concern are discussed below. Hazardous materials must be placarded on all four sides of EACH Trailer. You are doing a walkaround inspection of a double or triple trailer rig.