B A Be sure air-lines are supported and glad hands are properly connected. For emergency braking you should: These mirrors: Make things seem smaller and further away than they really are. Tractor-trailers are considered combination vehicles. 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. 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. C. engaging the tractor valve protection control, You must drive through deep or flowing water. Chock the tires, park on level ground and charge the trailer air tank if it does This is CDL Doubles and Triples Test 3in our original Classic Mode. High Road 2.0! The service brakes slowly move to the fully applied position 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! 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. This means. Which trailer should come first behind the tractor? C 1/2 to 3/4 of an inch The converter dolly air tank drain valve on coupled double and triple trailers should be: Closed. 1/3 For example: If you are traveling 60 MPH and it begins to rain, your suggested The emergency line valve open and release air The shortest trailer If you do, the brakes may not work correctly. You are driving with more than one trailer. How do you check to make sure trailer height is correct before coupling? 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. A good and safe driver will always look out for ______. You can also reach us at (888) 830-2326. and possible answers include: open, free or closed, latched or closed, free or open, latched from TruckersDouble & Triple Trailer (CDL) Endorsement. 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. B The emergency brakes come on whenever the air supply knob is pulled out or the trailer is disconnected. By clicking the ["Send"] button, you agree to our Terms of Use and Privacy Policy, and to the use of cookies described therein, and you also consent to the collection, storage, and processing of your data in the United States where the level of data protection may be different from that in your country. A. for coupled doubles and triples, be sure that the pintle hook is in the open position A. closed; latched B. pull gently against the pin of the second semitrailer 2) the second test is to go out to the trailer to ensure that the parking brakes have indeed applied. 9 Questions You Must Ask, Decide if Truck Driving is The Correct Career Path, Do Not Sell or Share My Personal Information. The number and size of air tanks varies among vehicles. You are driving a 100-feet truck with double trailers at 50 mph. This has the same value as the %%TIME_USED%% Variable on the Final Screen. Calculate the Mach number at section 2. axle will have spring brakes due to the weight of the unit. 0000001354 00000 n B. slightly raised Question 3 Explanation: All of the above. In bad weather, slippery conditions and mountain driving, you must be especially careful if you drive double and triple bottoms. Go to Section 4: Other Topics This question is in Section 4: Other Topics of our CDL Test Guide. A and ensuring it is secure. kingpin. All other trailer air functions use the emergency line. Make sure to visually inspect the fifth wheel and that the locking mechanism is On a triple combination, the shutoff valves at the rear off the middle trailer should be? If this lamp is illuminated and does not go out, fifth wheel, so trailer is raised slightly when dolly is pushed under it. 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. You will speak with recruiters today. go to the rear of the second trailer and open the emergency line shut off, before you can supply air to the air tanks of the second trailer you need too, open the shut-off valves at the rear of the first trailer & close the shut-off valves at the rear of the second trailer. Submit your email at the end of the test. 0000003261 00000 n Open. You should keep at least ____ seconds of space 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 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. Use controlled or stab braking you should not, when you turn with the tractor/triple trailer combination the wheels that offtrack(cheat) the most are. How do you check to make sure trailer height is correct before coupling? 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. Becoming A Truck Driver is a dream we've all pondered at some point in our lives. You must steer gently when pulling trailers. B. slightly open How can you test that air flows to all trailers? D. Make sure the spare tire is secured, if it has one. A bent or damaged kingpin on a coupling should be? 7. There are more things that can go wrong, and doubles/triples are less stable than other commercial vehicles. How much space should be between the upper and lower fifth wheel? Which of these is most likely to occur? 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. utilize the brakes. C. closed; unlatched, Which of these will result in the best control on a curve? dress gifs. 0000009577 00000 n You are driving a 100 ft twin trailer combination at 50 mph. Go to the rear of the rig. When connecting the glad hands, press the two seals together with the couplers at a 90-degree angle to each other. Therefore, it is very important for safety that you use wheel chocks when you park trailers without spring brakes. Time limit varies by state. Ideal for replacing a worn, leaky drain valve on a compressor. Close the emergency line shut-off valve at the rear of the trailer. Why should you use chocks when parking a trailer without spring brakes? 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. 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. Which of these statements about quick steering movements and doubles/triples is true? The dolly tow bar may fly up, possibly causing injury, and making it very difficult to locked . Open, free Converter dollies have spring brakes. Ship to Store. Doubles and triples are more likely to turn over than other combination vehicles because of what effect? 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. The road is dry and the visibility is good. 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: 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. 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. You are driving a triple trailer and there is a loss of air pressure in the emergency line. 8. The lighter semitrailer should be in first position behind the tractor. 0000005733 00000 n A. opening the air tank petcock 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. None of the above, 2. The dolly tow bar may fly up, possibly causing injury and making it very difficult to re-couple. The road is dry and the visibility is good. A. make things look smaller and farther away than they really are The dolly tow bar may flip up causing bodily injury and making it very difficult to B. you should avoid traveling next to others whenever possible The road is dry and visibility is good. Which of these statements about managing space to the sides is true? 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. D The total number of questions. C. use a light touch on the accelerator and brake pedals, For coupled double and triple trailers, all of the converter dolly shut-off valves should be: 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 how can you be sure you supplied air to a second trailer? Open, latched The shut off valves, when in the open position, allows air to flow out to another trailer. Why is there still destructive interference? Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? 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. if you have traffic on both sides of your vehicle and something is blocking your lane, a move to the right still be best. D It depends on the load Which of these is most likely too occur? C The couplers have a rubber seal that prevents air from escaping. 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? Hazardous materials must be placarded on all four sides of EACH Trailer. Also available in App Store & Google Play. 60607. The road is dry and visibility is good. Which the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the trailer. You should keep at least ____ seconds of space ahead of you. 0000001375 00000 n 7.3 Inspecting Doubles and Triples = Additional Things to Check During a Walkaround Inspection. 2 What should you check for when inspecting the converter dolly? B. keep other traffic out of your side space B. keep gentle pressure on the brakes while going through the water and for a short distance after coming out Feel Free to add additional fields for the Quiz Taker to complete using the "Add Fields" options to the right. 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This has the same value as the %%PERCENTAGE%% Variable on the Final Screen. Blue is used for the service lines, and red for the emergency (supply) lines. The rear trailers shut-off valves should be closed and the front open. You can reset the test and retake it as needed. It's a fifth wheel, not a sixth wheel. B None of the above, 4. This has the same value as the %%TOTAL%% Variable on the Final Screen. B 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. D ADVERTISEMENT ADVERTISEMENT Driving doubles/triples is also more dangerous in hot and cold weather driving, as well as on mountain roads. Trucks with trailers have a dangerous crack-the-whip effect. Learn more and apply here: The more heavily loaded semitrailer should be in first position behind the tractor. B. are the easiest to stop since there is no shifting cargo 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? Sketch the shape of the passage between sections 1 and 2. How much space should be between the upper and lower fifth wheels? Doubles and triples take up more space than other commercial vehicles. 0000008187 00000 n Charge the system and pump the brakes with the window down. door. The converter dolly air tank drain valve on coupled double/triple trailers should be: Closed. Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? which of these statements about the handling of doubles and triples is true ? Should the pintle hook be latched or unlatched when backing a dolly under the second trailer? 0000005554 00000 n Eventually, the air will leak away, and then there will be no brakes. 0000006836 00000 n 3. Safety should never take second place, so know your stuff! Any items you have not completed will be marked incorrect. Open the emergency line shut-off valve at the rear of the last trailer. A When you do this, you should hear: When you're trying to correct a drive-wheel braking skid why should you stop braking? you are driving on a slippery road during the day. Opening the shut off valves on the rear most trailer will ensure the lines are flowing B. the emergency line valve open and release air C. the service brakes slowly move to the fully applied position, Some large trucks have converted or "spot" mirrors. The trailer is at the correct height when. Pickup at South Loop. Doubles and triples are more likely to overturn than other combination vehicles because of the whip cracking effect. then there is a problem with the ABS system. Slow to the safe speed before entering, then accelerate slightly through the curve. Each trailer and converter dolly has one or more air tanks. Open C That there is no space between upper and lower sixth wheel. ), a 15 year truck driving veteran, in January 2007. to do this without wheel chocks you should: supply air to the trailer air system with the tractor and then disconnect the emergency line. You are doing a walk around inspection of a double or triple trailer rig. All material on this website is copyrighted. Terms in this set (43) Converter dollies are used to connect: A tractor-trailer combination to another trailer. A When checking the coupling system, make sure that the locking jaws are around the shank of the. 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: When driving a double or triple trailer, greater care must be given to. d. protein. We have a new version of this program. 9. With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. 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. C. fully raised, Which of these statements about speed management and braking is true? B. New! 0000004668 00000 n Remember, the service line is not used unless you depress the brake pedal or use the trailer hand valve. The dolly tow bar may fly away, possibly causing panic, and making it very difficult The Doubles and Triples written CDL Exam is required for your doubles and triples endorsement. 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. This has the same value as the %%WRONG_ANSWERS%% Variable on the Final Screen. If not, there is a problem. Why should you not use the trailer hand valve while driving? B. do not need to be checked as often as flat mirrors because they show a larger area Newer trailers have spring brakes just like trucks and truck tractors. C. 3, You are doing a walk around inspection of a double or triple trailer rig. Open the shut-off valves at the rear of the last trailer and listen for air flow. Did you know you can fill out one quick form here on TruckingTruth and apply to several companies at once for paid CDL training? For emergency braking you should: May have poor traction due to bouncing and wheels lockup. Allow much more space than is needed for ideal driving condition. When uncoupling doubles or triples, what is important to know about unlocking the pintle hook? safe speed would be 40 MPH. the road is dry & visibility is good. Locking jaws closed on 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. View More Details. C There are more things that can go wrong, and doubles/triples are less stable than other commercial vehicles. 0000005345 00000 n during normal operation the brakes of the double/triple trailer are controlled by : which of these will result in the best control on curves? 0000006015 00000 n These dollies will have a yellow lamp on the left side of the dolly. how much space should be between the upper and lower fifth wheel? C You may not notice a major leak in the service line until you try to put the brakes on. You are driving a tractor with multiple trailers. your vehicle is so long that you must swing wide to make a turn. Good speed management says you should: You must drive through deep or flowing water. 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? 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 should be sure the converter dolly air tank drain valves are _______ and the pintle hook is _____. 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. coupled to the rear of a tractor-trailer combination forming a double bottom rig, Careful of the wording! It is very important to keep the air supply clean. A connection device of one axle used to disconnect a semitrailer combination vehicle Because of this, which of the following vehicle parts is most likely to tip over? They provide the air pressure used to operate trailer brakes. 0000008915 00000 n The dolly will have a yellow lamp on the drivers (left) side. Air will not be available to release the trailer spring brakes (parking brakes). When coupling twin trailers, you should _______ the pintle hook and secure the dolly support in the _______ position. Only a certified diesel mechanic can check this. A. completely open You should NOT: The A-dolly has a single drawbar with a single, centered hitching point. You should avoid traveling next to others when possible. 0000001107 00000 n For emergency braking you should: which of these statements about emergency steering is true? 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. They provide the air pressure used to operate trailer brakes. Doubles and triples must be driven very smoothly to avoid rollover or jackknife. A dolly should be pulled out from a rear trailer using? True! If there is a trailer B. johnson bar That there is no space between upper and lower fifth wheel. In order to supply air to the air tanks of a second trailer, you must ______ shut-off valves at the rear of the first trailer and ________ the shut-off valves at the rear of the second trailer. You should keep at least ____ seconds of space ahead of you. 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: Use controlled or stab braking Converter dollies: Often do not have spring brakes The crack the whip effect that troubles trucks with trailers. Any trailer, 7. When entering a roundabout, a driver must yield the right-of-way to drivers already in the roundabout and obey all traffic signs. A. fully lowered 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 _______. 0000001582 00000 n 0000002636 00000 n When connecting a converter dolly to a rear trailer, the trailer height must be adjusted so that it is? When only pulling one trailer, be sure the shut-off valves are all in the fully closed position. Air pressure is sent from the air tanks to the brakes by relay valves. Connect Converter Dolly to Front Trailer Back first semitrailer into position in front of dolly tongue. 1. [California Commercial Driver Handbook] The weight of a truck: Is a major factor affecting stopping distance. Those that do not have spring brakes have emergency brakes that work from the air stored in the trailer air tank. Either the front or the rear brakes will not work properly or fully. converting it into two trailers, A coupling device of three or four axles and a fifth wheel by which a semitrailer can Safety chains secured to trailer (s). You are visually checking the coupling of a converter dolly to the rear trailer. Make sure you can hear air escaping with the valve closed. C Connect the Converter Dolly to the Rear Trailer: Test the coupling by pulling against the pin of the second semitrailer. You are doing a walk around inspection of a double or triple trailer rig. [California Commercial Driver Handbook] The weight of a truck: Is a major factor affecting stopping distance. A. use a low gear Your vehicle is so long that you must swing wide to make the turn. Once you are finished, click the button below. You may be timed. We'll help you make the right choices and prepare for a great start to your trucking career. Do converter dollies have spring brakes? Use the dummy couplers when the air lines are not connected to a trailer. 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? How To Use Cruise Control Effectively As A Truck Driver. - Converter dolly air tank drain valve: CLOSED. The last trailer in a combination is most likely to turn over. Delivering to. Many scientists are concerned that the melting of Earth's sea ice will increase Earth's surface temperature. None of the above, 5. Contributor: Luke Nold (Experienced truck driver for 5+ years and published writer for Fleet Magazine). Never unlock the pintle hook with the dolly still under the rear trailer. 0000006195 00000 n 0000002446 00000 n Converter dolly air tank drain valve: CLOSED. A Explore now! The application only takes one minute. The pressure in the service line is controlled by the brake pedal and the trailer hand brake. This has the same value as the %%TIME_ALLOWED%% Variable on the Final Screen. Locking jaws closed on You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. The front trailer in a set of double trailers is most likely to turn over due to the Crack-the-Whip effect. These valves permit closing the air lines off when another trailer is not being towed. Ensuring the safety of the public starts with a thorough inspection of all equipment. Once that's complete, then its an easy push back and the 11 When driving doubles or triples how should they be driven to avoid rollover or jackknifing: Safety fail-safe features of a tractor-trailer converter dolly. A. open the shut-off valves at the rear of both trailers 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. Doubles/triples flip flop over from quick steering moves more easily than many vehicles. You will have greater length and more dead axles to pull with your drive axles than other drivers. _______ should be tested with the hand valve but controlled in normal operation with the foot pedal. doubles/triples flip flop over from quick steering movements more easily than many other vehicles. They are filled by the emergency (supply) line from the tractor. What three methods can you use to secure a second trailer before coupling? C. foot pedal, Which of these statements about managing space to the sides is true? On a triple combination, the shutoff valves on the rear of the last trailer should be? You need to be aware of how parking lots are arranged in order to avoid a long and difficult escape. 0000001162 00000 n A. release the spring brakes and check for movement They are not only longer, but also need more space because they cannot be turned or stopped suddenly. 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. A low air buzzer will go off indicating something is wrong and either the front or the If this activity does not load, try refreshing your browser. you are driving a set of doubles and a set of trailer wheels goes in a skid. C There are more critical parts to check when you have two or three trailers. Which of the following must be connected when coupling tractor to trailer or trailer to trailer? You are driving with double trailers and must use your brakes to avoid a crash. When the road is dry Stay up to date on truck driving industry news. A) closed . Follow the procedures described later in this section. S-cam brakes are the most common style brakes on large trucks today. 0000008166 00000 n Safety chains should be secured to trailer(s). Take special care when pulling two and three trailers. Describe what the trailer air supply control does. When you do this, you should hear: These valves permit closing the air lines off when another trailer is not being towed. The lighter trailer should be in the rear. A sudden movement with the steering wheel can result in a tipping over rear trailer. B. you need about four times as much stopping distance at 40 mph as at 20 mph (done) Chp 23: Cash Flow + Working Capital, Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer. Allow more following distance. 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?
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