D At TruckingTruth we'll help you decide if trucking is right for you and help you get your career off to a great start. If the air supply in the trailer air tank has leaked away, there will be no emergency brakes, and the trailer wheels will turn freely. This would be very dangerous. you should keep atleast __seconds of space ahead of you. This has the same value as the %%TIME_USED%% Variable on the Final Screen. Be certain you are clear at the sides before changing lanes. If you leave this page, your progress will be lost. For emergency braking you should: which of these statements about emergency steering is true? The number and size of air tanks varies among vehicles. The converter dolly is an auxiliary axle with a coupling device. utilize the brakes. Visually check to make sure that the rear trailer is slightly lower than the center of the For all brakes to work on a triple combination, you must have air supply? kingpin. Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? on kingpin. While inspecting your converter dolly coupling, you should make sure there is _____ between the upper and lower fifth wheel. "Glad hands" are coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer. safe speed would be 40 MPH. which of these is not a good thing to do when driving on slippery roads? [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." All trademarks are property of their respective owners. Which diagram shows the best way to turn? C. if you have traffic on both sides of your vehicle and something is blocking your lane, a move to the right may still be best, To uncouple the rear trailer in a set of doubles, the shut-off valve at the rear of the front trailer should be: The emergency brakes come on whenever the air supply knob is pulled out or the trailer is disconnected. Did you know you can fill out one quick form here on TruckingTruth and apply to several companies at once for paid CDL training? Hook dolly to front trailer. B A 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 The lighter semitrailer should be in first position behind the tractor. 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. Typically depends on the axle count. you should check the trailer height before connecting a converter dolly to a second or third trailer. A. the total stopping distance of a truck is the distance it takes to stop once the brakes are put on at any speed You are driving with double trailers and must use your brakes to avoid a crash. To check if the converter dolly is securely coupled to the rear trailer you should: Pull gently against the pin of the second trailer. 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? You should hear air escaping, showing the entire system is charged. Air valves should be closed on all trailers, Air valves should be open on all trailers, Rear of front trailers: closed, rear of last trailer: open, Rear of front trailers: open, rear of last trailer: closed. The DMV doubles triples practice test will examine your knowledge of pulling double/triple trailers, coupling and uncoupling, inspecting doubles and triples, and checking air brakes. You should check the height of the trailer before connecting a converter dolly to a second or third trailer. Only a certified diesel mechanic can check this. When driving a truck with more than one trailer, which trailer should be first behind the truck? Why should you use chocks when parking a trailer without spring brakes? A converter dolly is a piece of equipment designed to allow commercial trucks, such as semi-trucks, to pull a trailer. Doubles and triples take up more space than other commercial vehicles. The pintle hook? Park the rear trailer against another trailer, chock the tires and lock the trailer These mirrors: make things seem smaller & further away then they really are. You may be timed. You should NOT: In the coupling system, the locking jaws should be fixed around? 1. Some vehicles have dead end or dummy couplers to which the hoses may be attached when they are not in use. the fifth wheel, so trailer is raised slightly when dolly is pushed under it. 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? A. air escape from the open valve and the converter dolly air tank drain valve should be _____. When you're finished, check your score and results. "Glad hands" are coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer. Seriously! The lightest trailer The rear trailers shut-off valves should be open and the front closed. Doubles and triples must be driven very smoothly to avoid rollover or jacknife. A. release the spring brakes and check for movement if you have traffic on both sides of your vehicle and something is blocking your lane, a move to the right still be best. A good and safe driver will always look out for ______. There are more critical parts to check when you have two or three trailers. 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 0000005664 00000 n Should the converter dolly air-tank drain valve be open or closed on a double trailer combination? Allow more following distance. 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? A. allow "much more space" than is needed for ideal driving conditions The dolly tow bar may fly away, possibly causing panic, and making it very difficult B. open the shut-off valves at the rear of the first trailer and close the shut-off valves at the rear of the second trailer Each tank has a drain valve on it, and you should drain each tank every day. How can you test that air flows to all trailers? B. are the easiest to stop since there is no shifting cargo 0000010783 00000 n . If spare tire is on converter gear (dolly), make sure it is secured. Driving doubles/triples is also more dangerous in hot and cold weather driving, as well as on mountain roads. Number of wrong answers. A A vehicle transporting hazardous materials is required to display placards where? 0000003977 00000 n 2003-2023 Chegg Inc. All rights reserved. 0000008894 00000 n Pull gently against the pin of the second trailer. Nothing, the weight of the trailer will keep it in place, 10. Page 7-6 Commercial Driver's Manual/2.0 = Be sure air lines are supported and glad hands are properly connected. B. you need about four times as much stopping distance at 40 mph as at 20 mph you are visually checking the coupling of a converter dolly to the rear trailer. Calculate the net energy change in kilojoules per mole that takes place on formation of MgF2_22(s) from the elements: Heat of sublimation for Mg(s) = 147.7 kJ/mol Eea_{ea}ea for F(g) = -328 kJ>mol, Bond dissociation energy for F2_22(g) = 158 kJ>mol Ei1_{i1}i1 for Mg(g) = 737.7 kJ>mol, Electrostatic interactions in MgF2_22(s) = -2957 kJ/mol Ei2_{i2}i2 for Mg(g) = 1450.7 kJ/mol. A Commercial Drivers License Overview, Trucking Terminology and Transportation Definitions. D You should not hear air escaping. There are more things that can go wrong, and doubles/triples are less stable than other commercial vehicles. What three methods can you use to secure a second trailer before coupling? Which of these statements about managing space to the sides is true? When you do this, you should hear: Which of these statements about emergency steering is true? How can you test that air flows to all trailers? In order to receive your Doubles and Triples endorsement, it is required that you pass the state's official CDL written Knowledge exam. A 0000006015 00000 n How much space should be between the upper and lower fifth wheels? View More Details. We have a new version of this program. 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. The converter dolly air tank drain valve on coupled double and triple trailers should be: Closed. Chock the tires, park on level ground and charge the trailer air tank if it does Which of the following must be connected when coupling tractor to trailer or trailer to trailer? B. you should avoid traveling next to others whenever possible Describe what the trailer air supply control does. They are filled by the emergency (supply) line from the tractor. These valves permit closing the air lines off when another trailer is not being towed. When uncoupling, you should never unlock the _______ with the dolly still under the rear trailer. Pickup at South Loop. A. closed; latched The trailer brakes will unlock Doubles and triples must be driven very smoothly to avoid rollover or jackknife. A truckers workspace is a small moving office Read More. 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! retrovirus $_____________________________$. B. allow one vehicle length for every 10,000 lbs of gross vehicle weight Any vehicle required by federal regulations to be placarded while transporting hazardous materials. These mirrors: 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. Becoming A Truck Driver is a dream we've all pondered at some point in our lives. Be more careful in adverse conditions. Watch the wording of the question AND the answers A safe driver will look for all of the above. 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. Pull gently against them in a low gear to make sure the brakes work. a. blood A. use a low gear The trailer is at the correct height when. What do you check when making a visual check of coupling? the converter dolly air tank drain valve on couple double/triple trailers should be: to check if the converter dolly is securely coupled to the rear trailer you should: pull gently against the pin of the second trailer. You should keep at least ____ seconds of space ahead of you. 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. When testing trailer service brakes, you should use? But the brakes will hold only as long as there is air pressure in the trailer air tank. You are driving a 100-feet truck with double trailers at 50 mph. 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. You must steer gently when pulling trailers. Pintle-eye of dolly in place in pintle hook of trailer (s). B. the emergency line valve open and release air Which of the following statements about off tracking is true? What does the Commercial Driver Handbook say about how much space you should keep ahead of your truck? Air flows steadily and isentropically through a passage. then there is a problem with the ABS system. C A Seriously! Which of these is the correct answer? A converter dolly is still under the second trailer when you unlock the pintle hook. 6. Connect the Converter Dolly to the Rear Trailer: Test the coupling by pulling against the pin of the second semitrailer. When checking the fifth wheel, you should make sure that it has enough? Doubles and triples are more likely to turn over than other combination vehicles because of the "crack-the-whip" effect. What is a converter dolly? Once that's complete, then its an easy push back and the If a converter dolly is still under the second trailer and you unlock the pintle hook, what will probably happen? Safety chains secured to trailer (s). You are visually checking the coupling of a converter dolly to the rear trailer. Often do not have spring brakes Make sure trailer height is correct. To check air flows to all trailers, you should let air pressure reach normal then? behind the shut-off valve then they need to remain open. These dollies will have a yellow lamp on the left side of the dolly. The rear trailer does not have shut-off valves. Never unlock the pintle hook with the dolly still under the rear trailer. Should the shut-off valves on the trailers be open or closed on a set of double trailers? Mar 2 - Mar 3. Remember, the service line is not used unless you depress the brake pedal or use the trailer hand valve. unsafe slow down even further, or better yet, find a safe haven and park until the The rear trailer of a double That there is some space between the upper and lower fifth wheel. Contributor: Luke Nold (Experienced truck driver for 5+ years and published writer for Fleet Magazine). You will not be tested on uncoupling twins unless you want to get a double/triple trailer endorsement on your license. when driving a truck with more than one trailer, which trailer should be first behind the truck? How many different ways of coupling and uncoupling trailer combinations are there? When does the Driver's manual say you should disable the steering axle brake? Should the shut off valves on the rear of the first trailer be open or closed on a set of double trailers? Before coupling a trailer, you should make sure it is at the right height using? Doubles and triples are more likely to overturn than other combination vehicles because of the whip cracking effect. Open the emergency line shut-off valve at the rear of the last trailer. 2 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 _______. Make sure you do not get in a spot you cannot pull straight through. 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 total number of questions. Which trailer should come first behind the tractor? None of the above, 2. Unless you are draining the condensation out of the air tank, then the drain valve C. the service brakes slowly move to the fully applied position, Some large trucks have converted or "spot" mirrors. B D HlTo xGf`{iIMh-x||?pbE':X4ZZZRbu7 uvi_RHUkVXBVu{^B3 4e/iw\]RE] YY7i)e V*h(++WQ-]Xm9c5yU6BS" 5HiL,[b)ee:t/ )%BVGpU7T\ZJD On the first trailer in a set of doubles? locked . The word part ferrit- means: Doubles and triples must be driven very smoothly to avoid rollover or jackknife. The crack the whip effect that troubles trucks with trailers. 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? Which is most likely to tip over: True False True If you want to couple a second trailer to you combiantion vehicle, secure it by using the: Trailer emergency air brakes. 3. Calculate the Mach number at section 2. 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. Air escape from the open valve 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 When checking your air lines, they must be secure and? 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. what is likely to happen if the pintle hook is unlocked with the dolly still under the second trailer? If the fifth wheel on a coupling is too far forward, the tractor frame may hit? 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. Check them all. _______ should be tested with the hand valve but controlled in normal operation with the foot pedal. When uncoupling a rear trailer, you should remove some weight from the dolly by? B The road is dry, and visibility is good. What's a converter dolly? C The heavier trailer should be in the rear. 0000001375 00000 n Safety fail-safe features of a tractor-trailer converter dolly. You should keep at least ___ seconds of space ahead of you. They provide the air pressure used to operate trailer brakes. B B Blue is used for the service lines, and red for the emergency (supply) lines. A. make things look smaller and farther away than they really are Like a trailer, a dolly equipped with ABS will have a yellow indicator light on the left side. Newer trailers have spring brakes just like trucks and truck tractors. D What is the most common foundation brake found on heavy vehicles? B The air lines will rupture The pressure in the service line is controlled by the brake pedal and the trailer hand brake. The converter dolly air tank drain valve on coupled double/triple trailers should be: Closed. B. keep gentle pressure on the brakes while going through the water and for a short distance after coming out 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. Locking jaws closed on 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. front of the second trailer. 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. Try our free CDL Doubles and Triples Test Question and Answers Quiz online. You must stop, yield to traffic and pedestrians, and only proceed when safe. Converter dolly air tank drain valve: CLOSED Air lines supported and glad hands properly connected. The emergency line valve open and release air None A connection device of one axle used to disconnect a semitrailer combination vehicle What is a converter dolly? Slow to the safe speed before entering, then accelerate slightly through the curve.
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