Watch the wording of the question AND the answers A safe driver will look for all of the above. 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? Use only the trailer brakes re-couple, You can if you want to, it does not matter. Try our free CDL Doubles and Triples Test Question and Answers Quiz online. 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 not, there is a problem. Air escape from the open valve You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. Did you know you can fill out one quick form here on TruckingTruth and apply to several companies at once for paid CDL training? Do converter dollies have spring brakes? Dont hesitate to take advantage of our practice tests in each category specific to your needs. A. you can steer more quickly and safely if you hold the wheel with one hand _______ should be tested with the hand valve but controlled in normal operation with the foot pedal. There are more critical parts to check when you have two or three trailers. What types of trailers can get stuck on raised crossings? Safety chains secured to trailer (s). 1) the first one is to pump down the air pressure in the system between 20 and 45psi (pounds per square inch) the trailer air supply will pop out, shutting air off to the trailer. To check air flows to all trailers, you should let air pressure reach normal then? You are driving with double trailers and must use your brakes to avoid a crash. Locking jaws closed on The crack the whip effect will topple the rear trailer first. securely fastened. Use the dummy couplers when the air lines are not connected to a trailer. 1/4 in. This has the same value as the %%TIME_USED%% Variable on the Final Screen. Have little braking power because they are small If the dolly is a two axle unit then 1 paramount to safe driving. A full trailer behind a truck 0000007487 00000 n The road is dry and the visibility is good. Many scientists are concerned that the melting of Earth's sea ice will increase Earth's surface temperature. can and will get stuck on a raised railroad crossing. How many different ways of coupling and uncoupling trailer combinations are there? What three methods can you use to secure a second trailer before coupling? On double and triple combinations, you must make sure that which of these is secure? 2. Question 4. 0000007032 00000 n That there is no space between upper and lower fifth wheel. Which of the following will probably happen if you are driving a double rig and a set of trailer wheels goes into a skid? The road is dry and the visibility is good. 0000009556 00000 n Please visit using a browser with javascript enabled. You should avoid traveling next to others when possible. A good and safe driver will always look out for ______. A low air buzzer will go off indicating something is wrong and either the front or the 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. Pintle-eye of dolly in place in pintle hook of trailer (s). When you do this, you should hear: Which of these statements about emergency steering is true? ADVERTISEMENT ADVERTISEMENT Always test the trailer brakes before driving with the hand valve or by pulling the air supply (tractor protection valve) control. D. Make sure the spare tire is secured, if it has one. 12, 3. If this activity does not load, try refreshing your browser. Be more careful in adverse conditions. However, converter dollies and trailers built before 1975 are not required to have spring brakes. They provide the air pressure used to operate trailer brakes. A C To do this without wheel chocks you should: Empty trucks: When parking your double or triple combination, you should look for a parking space These mirrors: Make things seem smaller and further away than they really are. All ABS equipped units You need to brake in order to regain control. locked . Converter dollies have spring brakes. Mar 2 - Mar 3. Any vehicle required by federal regulations to be placarded while transporting hazardous materials. Make a sketch that explains this phenomenon in terms of a feedback loop . 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. True False True If you want to couple a second trailer to you combiantion vehicle, secure it by using the: Trailer emergency air brakes. That there is no space between upper and lower sixth wheel. You should not hear air escaping. You should be sure the converter dolly air tank drain . You should keep at least ____ seconds of space ahead of you. Once you are finished, click the button below. A. allow "much more space" than is needed for ideal driving conditions When you're trying to correct a drive-wheel braking skid why should you stop braking? [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." Calculate the Mach number at section 2. 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. It is very important to keep the air supply clean. B. the emergency line valve open and release air Should I Be A Truck Driver? What is most likely to happen if the trailer protection valve of a double or triple trailer does not function correctly? Like a trailer, a dolly equipped with ABS will have a yellow indicator light on the left side. To help avoid mistakes, colors are sometimes used. 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. Calculate the voltage gain of each. Should the shut off valves on the rear of the first trailer be open or closed on a set of double trailers? 0000006383 00000 n How can you test that air flows to all trailers? Remember: The trailer air brakes are supplied with air using the emergency line (also called the supply line). A When does the "driver's manual" advise disconnecting the steering axle brakes to help On a triple combination, the shutoff valves at the rear off the middle trailer should be? For all brakes to work on a triple combination, you must have air supply? Locking jaws closed on There are more things that can go wrong, and doubles/triples are less stable than other commercial vehicles. The number of correct answers. Slow to a safe speed before entering the curve, then coast through the curve. Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? A vehicle transporting hazardous materials is required to display placards where? How do you check to make sure trailer height is correct before coupling? These mirrors: make things seem smaller & further away then they really are. 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 the rig will continue moving in a straight line no matter how much the steering wheel is turned. "Glad hands" are coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer. If this lamp is illuminated and does not go out, B. for doubles and triples, the fifth wheel should be all the way towards the tractor TestPermit.com provides free unofficial review materials for a variety of exams. Safety fail-safe features of a tractor-trailer converter dolly. (done) Chp 23: Cash Flow + Working Capital, Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer. 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. - Converter dolly air tank drain valve: CLOSED. Make sure you do not get in a spot you cannot pull straight through. How can you test that air flows to all trailers? You are driving a 100-feet truck with double trailers at 50 mph. fifth wheel, so trailer is raised slightly when dolly is pushed under it. 10. B. slightly open The last trailer in a combination is most likely to turn over. 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: Should the converter dolly air-tank drain valve be open or closed on a double trailer combination? 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. For emergency braking you should: May have poor traction due to bouncing and wheels lockup. B. you can almost always stop more quickly than you can turn You need to be aware of how parking lots are arranged in order to avoid a long and difficult escape. You are visually checking the coupling of a converter dolly to the rear trailer. You are doing a walkaround inspection of a double or triple trailer rig. Locking jaws open then there is a problem with the ABS system. Only a certified diesel mechanic can check this. What happens if you cross the Emergency Air Line and the Service Air Line? When driving a truck with more than one trailer, which trailer should be first behind the truck? To uncouple the rear trailer in a set of doubles, the shut-off valve at the rear of the front trailer should be: Closed. Which of these is most likely to occur? dress gifs. None of the above, 5. You should keep at least ___ seconds of space ahead of you. You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. 0000001162 00000 n You should be sure the converter dolly air tank drain valves are _______ & the pintle hook is __________. C. When coupling doubles and triples, be sure that the pintle-eye of the dolly is in place in the pintle hook of the trailer, You are driving on a slippery road during the day. Some large trucks have curved (convex or spot) mirrors. 0000003977 00000 n A bent or damaged kingpin on a coupling should be? 0000001956 00000 n Before coupling a trailer, you should make sure it is at the right height using? you are doing a walkaround inspection of a double or triple trailer rig. Eventually, the air will leak away, and then there will be no brakes. B. how can you be sure you supplied air to a second trailer? c. iron If it goes low enough, the trailer emergency brakes will come on. 60607. Ensuring the safety of the public starts with a thorough Explore now! Connect the Converter Dolly to the Rear Trailer: Test the coupling by pulling against the pin of the second semitrailer. What is a converter dolly? By clicking on "Sign Up", you agree to our Terms of Use and Privacy Policy. 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. You are driving a 100 foot twin trailer combination at 50 mph. D B Which of the following will occur? You should NOT: Terms in this set (43) Converter dollies are used to connect: A tractor-trailer combination to another trailer. to do this without wheel chocks you should: supply air to the trailer air system with the tractor and then disconnect the emergency line. The pressure in the service line tells how much pressure the relay valves should send to the trailer brakes. When you do this, you should hear: you are driving with double trailer and must use your brakes to avoid a crash. The rear trailer does not have shut-off valves. 1/3 For example: If you are traveling 60 MPH and it begins to rain, your suggested Some do. Their drawbars differentiate them. Tractor-trailers are considered combination vehicles. the fifth wheel, so trailer is raised slightly when dolly is pushed under it. In the coupling system, the locking jaws should be fixed around? A When checking the coupling system, make sure that the locking jaws are around the shank of the. Open the emergency line shut-off valve at the rear of the last trailer. A. use a low gear These dollies will have a yellow lamp on the left side of the dolly. Make sure pintle hook is latched. Connect the Converter Dolly to the Rear Trailer: Test the coupling by pulling against the pin of the second semitrailer. 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. A. always keep your vehicle to the right side of your lane 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. You may not notice a major leak in the service line until you try to put the brakes on. A. the total stopping distance of a truck is the distance it takes to stop once the brakes are put on at any speed 8. What's a converter dolly? The word part ferrit- means: 2) the second test is to go out to the trailer to ensure that the parking brakes have indeed applied. True or False? C. 3, You are doing a walk around inspection of a double or triple trailer rig. Open, free rear trailer. Once that's complete, then its an easy push back and the The service brakes slowly move to the fully applied position Stay up to date on truck driving industry news. True! how much space should be between the upper and lower fifth wheel? Types of converter dollies. How much space should be between the upper and lower fifth wheel? 4. They provide the air pressure used to operate trailer brakes. 2. 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. Disconnect the glad-hand at the front of the first trailer and listen for air flow. 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. In bad weather, slippery conditions and mountain driving, you must be especially careful if you drive double and triple bottoms. 3. Therefor, if there is a major leak in your service line, you may not know it until you try to use the service brake. you are driving on a slippery road during the day. The converter dolly air tank drain valve on coupled double/triple trailers should be: Closed. The shut off valves, when in the open position, allows air to flow out to another trailer. The road is dry and visibility is good. You are driving a 100 ft twin trailer combination at 50 mph. Which trailer should come first behind the tractor? The rear trailer of a double you are driving a set of doubles and a set of trailer wheels goes in a skid. Open the shut-off valves at the rear of the last trailer and listen for air flow. You want to lock your combination to a second trailer that has no spring brakes. you are visually checking the coupling of a converter dolly to the rear trailer. A Open, latched B Open, free C Closed, latched D Closed, free 28. Which is most likely to tip over: These valves permit closing the air lines off when another trailer is not being towed. Closed, latched Air flows steadily and isentropically through a passage. Be sure pintle-eye of dolly is in place in pintle hook of trailer(s). You are driving a triple trailer and there is a loss of air pressure in the emergency line. Therefore, look far ahead so you can slow down or change lanes gradually when necessary. The driver will be required to complete this requirement in three eight hour shifts. Doubles and triples are extremely prone to control issues and must be 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: These trailers have no parking brake. After 15 years on the road I wanted to help people understand the trucking industry and everything that came with the career and lifestyle of an over the road trucker. All trademarks are property of their respective owners. The dolly tow bar may fly away, possibly causing panic, and making it very difficult You should be sure the converter dolly air tank drain valves are _____ and the pintle hook is _____. 0000004668 00000 n Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? The trailer height is right when: The trailer will be raised slightly when the converter dolly is backed under it. which of these is not a good thing to do when driving on slippery roads? The number and size of air tanks varies among vehicles. All other trailer air functions use the emergency line. How much space should be between the upper and lower fifth wheels? 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 On the first trailer in a set of doubles? B What does the Driver's manual say about how much space you should keep ahead of your truck? The couplers have a rubber seal that prevents air from escaping. you want to hook your combination to a second trailer that has no spring brakes. Number of wrong answers. What does the drivers manual say about how much space you should keep ahead of your truck? 4. 2 What do you check when making a visual check of coupling? You should keep at least ____ seconds of space ahead of you. 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. 0000010783 00000 n The pressure in the service line is controlled by the brake pedal and the trailer hand brake. Some areas of concern are discussed below. 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. mTouch Quiz will automatically populate the fields below. 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. If there is a trailer Time used (Requires timer add on). Slow to the safe speed before entering, then accelerate slightly through the curve. We've all wondered if the adventure and challenges of life on the open road would suit us better than the ordinary day to day lives we've always known. B. keep gentle pressure on the brakes while going through the water and for a short distance after coming out you should keep atleast __seconds of space ahead of you. Antilock Braking Systems on Converter Dollies, Converter dollies built on or after March 1, 1998, are required to have antilock brakes. 0000005554 00000 n 0000003060 00000 n A converter gear or dolly is a coupling device of one or two axles and a fifth wheel by which a semi-trailer can be coupled to the rear of a tractor-trailer combination forming a double bottom. Once you have coupled your rear trailer, you should test the coupling by? Hit the article below to see specific information about AOBRDs! and the converter dolly air tank drain valve should be _____. Converter dolly air tank drain valve: CLOSED. slow to safe speed before entering, then accelerate slightly through the curve. retrovirus $_____________________________$. You shouldn't stop braking. you are driving a 100ft truck eith double trailers at 50mph. The lightest trailer Stop the vehicle by gearing down and sparingly A. for coupled doubles and triples, be sure that the pintle hook is in the open position Email Updates When New Articles Are Posted. To prevent trailers from rolling over, you must steer gently and go slowly around corners, on ramps, off ramps and curves. You should be sure the converter dolly air tank drain valves are _______ and the pintle hook is _____. The trailer brakes will unlock Pull gently against the pin of the second trailer. This has the same value as the %%SCORE%% Variable on the Final Screen. 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. A. opening the air tank petcock C For emergency braking you should: The dolly will have a yellow lamp on the drivers (left) side. If your converter dolly has to be moved over a distance to bring it to your semitrailer, you should? Doubles/triples flip flop over from quick steering moves more easily than many vehicles. Hb```f``b`c``e@ (Q6_* We are an independent company focused on providing valuable motor vehicle and permit practice test information. Which of these is the correct answer? There is a school zone ahead. When does the "driver's manual" advise disconnecting the steering axle brakes to help keep the rig straight? The air lines will rupture you should check the trailer height before connecting a converter dolly to a second or third trailer. We wish you the best of luck in your endeavors and are pleased to be of assistance. The front trailer in a set of double trailers is most likely to turn over due to the Crack-the-Whip effect. Secure converter gear support in raised position. 1. Make sure you have large enough gaps before entering or crossing traffic. Newer trailers have spring brakes just like trucks and truck tractors. The shut off valves prevent air from going any further. 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. 0000006195 00000 n B 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 is one function of the tractor protection valve? We have a new version of this program. Hazardous materials must be placarded on all four sides of EACH Trailer. Please wait while the activity loads. Some vehicles have dead end or dummy couplers to which the hoses may be attached when they are not in use. The pintle hook? D Light cords firmly in sockets on trailer. d. protein. utilize the brakes. symptoms of a bad fuel tank selector switch. Which of these statements about the handling of doubles and triples is true? C. fully raised, Which of these statements about speed management and braking is true? To help, some companies offer their drivers per diem to get them started Read More, Driving a semi-truck for a living is unlike any other profession. How do you know if your converter dolly is equipped with antilock 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? 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. However there are some states that allow doubles that are each 48 feet in length. The emergency brakes come on whenever the air supply knob is pulled out or the trailer is disconnected. Make sure you can hear air escaping with the valve closed. 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. Air pressure is sent from the air tanks to the brakes by relay valves. 10 You are driving a 100-feet truck with double trailers at 30 mph. Provides a snug fit to eliminate unwanted seepage of air or water. 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, enclose converter dolly air tank drain valves Why should you use chocks when parking a trailer without spring brakes? The braking systems of double and triple trailers are different than those of straight trucks because doubles and triples. [California Commercial Driver Handbook] The weight of a truck: Is a major factor affecting stopping distance. None of the above, 2. If there are no dummy couplers, the glad hands can sometimes be locked together (depending on the couplings). Doubles and triples must be driven very smoothly to avoid rollover or jacknife. The road is dry and visibility is good. B. you need about four times as much stopping distance at 40 mph as at 20 mph A. air escape from the open valve There are more things that can go wrong, and doubles/triples are less stable than other commercial vehicles.
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