the converter dolly air tank drain valve should be

B. closed We have a new version of this program. 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. 0000010306 00000 n D 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: 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? This has the same value as the %%PERCENTAGE%% Variable on the Final Screen. with the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the trailer. 5. All material on this website is copyrighted. Visually check to make sure that the rear trailer is slightly lower than the center of the A There is no obligation whatsoever. 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 . the fifth wheel, so trailer is raised slightly when dolly is pushed under it. A major leak in the emergency line will cause the tractor protection valve to close and the trailer emergency brakes to come on. 4. 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]. 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. C. use stab or controlled braking, Which of these is true? coupled to the rear of a tractor-trailer combination forming a double bottom rig, A coupling device of one or two axles and a sixth wheel by which a semitrailer can be 0000002446 00000 n The last trailer in a combination is most likely to turn over. A. brake and downshift in a curve Open the emergency line shut-off valve at the rear of the last trailer. At section 2 downstream, the speed is 519 m/s. New! A. closed; latched The road is dry and visibility is good. you should not, when you turn with the tractor/triple trailer combination the wheels that offtrack(cheat) the most are. It's a fifth wheel, not a sixth wheel. When you are pulling trailers, which of the following statements is true about steering? What do you check when making a visual check of coupling? The trailer brakes will unlock Sometimes, metal tags are attached to the lines with the words service and emergency stamped on them. TestPermit.com is not affiliated, endorsed, or sponsored by state agencies or any motor vehicle and any other departments in the United States, Canada, UK. You are doing a walkaround inspection of a double or triple trailer rig. 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. B 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? to do this without wheel chocks you should: supply air to the trailer air system with the tractor and then disconnect the emergency line. 0000002636 00000 n 0000001956 00000 n A how much space should be between the upper and lower fifth wheel? Antilock Braking Systems on Converter Dollies, Converter dollies built on or after March 1, 1998, are required to have antilock brakes. To check that the trailer emergency brakes are working properly, you should pull out the trailer air supply control and? Doubles and triples are more likely to overturn than other combination vehicles because of the whip cracking effect. All of the above, 6. you are driving on a slippery road during the day. The dolly will have a yellow lamp on the drivers (left) side. A C. engaging the tractor valve protection control, You must drive through deep or flowing water. A. fully lowered Park the rear trailer against another trailer, chock the tires and lock the trailer A dolly is like a very short trailer, with a ring hitch on the front and a fifth wheel on top. When driving doubles or triples how should they be driven to avoid rollover or jackknifing: B Go to the rear of second trailer and open the emergency line shut-of valve. The final procedure when connecting a rear trailer is to? The driver will be required to complete this requirement in three eight hour shifts. B. the emergency line valve open and release air If you do, the brakes may not work correctly. How should you test the coupling? When the road is dry All rights reserved Site Map. How can you be sure you supplied air to a second trailer? A full trailer behind a truck For emergency braking you should: which of these statements about emergency steering is true? The pintle hook should always be secure when the vehicle is in motion. Open, free When driving a double or triple trailer, greater care must be given to. That there is no space between upper and lower sixth wheel. Close the emergency line shut-off valve at the rear of the trailer. A CDL is required to drive any of the following vehicles: A vehicle with two separate parts - the power unit (tractor) and the trailer. There is a school zone ahead. If the converter dolly is close to your semitrailer, you should wheel it into position? 2003-2023 Chegg Inc. All rights reserved. fifth wheel, so trailer is raised slightly when dolly is pushed under it. D For emergency braking you should: Email Updates When New Articles Are Posted. should remain in the closed position. If there is For emergency braking you should: May have poor traction due to bouncing and wheels lockup. It is extremely unlikely you will drive a trailer built before 1975, but for the written exam, you still may need to know that trailers built before 1975 were not required to have spring brakes. A Should the pintle hook be latched or unlatched when backing a dolly under the second trailer? 0000008915 00000 n 0000003261 00000 n View More Details. Time limit varies by state. In order to receive your Doubles and Triples endorsement, it is required that you pass the state's official CDL written Knowledge exam. Charge the system and pump the brakes with the window down. 0000001775 00000 n If spare tire is carried on converter gear (dolly), make sure it's secured. 0000003998 00000 n 0000009577 00000 n A. open This has the same value as the %%TIME_USED%% Variable on the Final Screen. what is likely to happen if the pintle hook is unlocked with the dolly still under the second trailer? You should avoid traveling next to others when possible. True! Connect the Converter Dolly to the Rear Trailer: Test the coupling by pulling against the pin of the second semitrailer. With the red knob pushed in on the tractor dash, the service line should have air in it. Seriously! Like a trailer, a dolly equipped with ABS will have a yellow indicator light on the left side. front of the second trailer. You should be sure the converter dolly air tank drain valves are _______ and the pintle hook is _____. 6. When only pulling one trailer, be sure the shut-off valves are all in the fully closed position. You are driving with double trailers and must use your brakes to avoid a crash. 3. ADVERTISEMENT ADVERTISEMENT Doubles and triples must be driven very smoothly to avoid rollover or jackknife. While inspecting your converter dolly coupling, you should make sure there is _____ between the upper and lower fifth wheel. Locking jaws closed on "Glad hands" are coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer. C Trailer Air Tanks And Shutoff Valves - Page 50. The heaviest trailer rear brakes will not work properly. 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. you should avoid traveling next to others when possible. Locking jaws open 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. axle will have spring brakes due to the weight of the unit. 0000010783 00000 n Should the shut-off valves on the rear of the last trailer be open or closed? 2. Did you know you can fill out one quick form here on TruckingTruth and apply to several companies at once for paid CDL training? What is a converter dolly? 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. 0000005733 00000 n Pull gently against the pin of the second trailer. 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. 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. Any time you have to rear trailer. Open C. 3, You are doing a walk around inspection of a double or triple trailer rig. However there are some states that allow doubles that are each 48 feet in length. You must steer gently when pulling trailers. 0000006195 00000 n When you do this, you should hear: you are driving with double trailer and must use your brakes to avoid a crash. What is the most common foundation brake found on heavy vehicles? True False True If you want to couple a second trailer to you combiantion vehicle, secure it by using the: Trailer emergency air brakes. There are more things that can go wrong, and doubles/triples are less stable than other commercial vehicles. We are an independent company focused on providing valuable motor vehicle and permit practice test information. you are driving at night and you must dim your headlights for traffic. A turn of the glad hand attached to the hose will join and lock the couplers. Good speed management says you should: You must drive through deep or flowing water. mTouch Quiz will automatically populate the fields below. What happens when there is a major leak in the emergency air line? The trailer height is right when: The trailer will be raised slightly when the converter dolly is backed under it. What is likely to happen? The front trailer in a set of double trailers is most likely to turn over due to the Crack-the-Whip effect. 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: While it is general practice to make blue the service line, red the emergency line, and green the electrical line, these colors are not required by any laws or regulations. This has the same value as the %%TIME_ALLOWED%% Variable on the Final Screen. Ensuring the safety of the public starts with a thorough inspection of all equipment. If your tanks have automatic drains, they will keep most moisture out, but you should still open the drains to make sure. 0000001375 00000 n 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 rear trailers shut-off valves should be closed and the front open. A truckers workspace is a small moving office Read More. None How can you test that air flows to all trailers? when driving a truck with more than one trailer, which trailer should be first behind the truck? Make sure to visually inspect the fifth wheel and that the locking mechanism is What should you check for when inspecting the converter dolly? locked . 0000010285 00000 n Mar 2 - Mar 3. The puzzle: At the far left edge, the plates are in contact, so the path length difference between rays 222 and 333 is zero. b. cell you should check the trailer height before connecting a converter dolly to a second or third trailer. Refers to pulling two trailers at the same time, otherwise known as "pups" or "pup trailers" because they're only about 28 feet long. In the coupling system, the locking jaws should be fixed around? Newer trailers have spring brakes just like trucks and truck tractors. which of these statements about managing space to the sides is true? 10 7. When coupling, be sure to couple the proper glad hands together. 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. When testing trailer service brakes, you should use? Study section 6.2 if you can't answer all of these questions. What does the drivers manual say about how much space you should keep ahead of your truck? on kingpin. B. 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 total number of questions. Which f these will result in the best control on curves? Open the emergency line shut-off valve at the rear of the last trailer. When uncoupling doubles or triples, what is important to know about unlocking the pintle hook? Air flows steadily and isentropically through a passage. You are driving a 100-feet truck with double trailers at 30 mph. On double and triple combinations, you must make sure that which of these is secure? 0000001107 00000 n Because of this, which of the following vehicle parts is most likely to tip over? Typically depends on the axle count. to re-capture it. 0000001354 00000 n Which of these is NOT a good thing to do when driving on slippery roads? B High Road 2.0! When checking the coupling system, make sure that the locking jaws are around the shank of the. What happens if you cross the Emergency Air Line and the Service Air Line? 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. D. Make sure the spare tire is secured, if it has one. Should the converter dolly air-tank drain valve be open or closed on a double trailer combination? This is CDL Doubles and Triples Test 3in our original Classic Mode. You will not be tested on uncoupling twins unless you want to get a double/triple trailer endorsement on your license. 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? Which of these statements about managing space to the sides is true? Double and triple trailers increase not only the operators risk of safety, but also the other motorists around him. 7.3 Inspecting Doubles and Triples = Additional Things to Check During a Walkaround Inspection. When uncoupling a rear trailer, you should remove some weight from the dolly by? D What is one function of the tractor protection valve? The road is dry and the visibility is good. Ideal for replacing a worn, leaky drain valve on a compressor. D Stay up to date on truck driving industry news. Driving doubles/triples is also more dangerous in hot and cold weather driving, as well as on mountain roads. Make sure you do not get in a spot you cannot pull straight through. 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. The number of correct answers. B. keep gentle pressure on the brakes while going through the water and for a short distance after coming out Be sure pintle-eye of dolly is in place in pintle hook of trailer(s). Ship to Store. The tanks will hold enough air to allow the brakes to be used several times even if the compressor stops working. Hit the article below to see specific information about AOBRDs! A. hand valve Types of converter dollies. Check them all. A) closed . To test the tractor protection valve, charge the trailer air brake system, turn off the engine, and paramount to safe driving. A dolly should be pulled out from a rear trailer using? 5. You must treat a flashing red signal as you would treat a STOP sign. The lightest trailer Why should you use chocks when parking a trailer without spring brakes? A Do converter dollies have spring brakes? 2. Number of wrong answers. d. protein. Open. It is important to check the height of the trailer before connecting a converter dolly to a trailer. Often do not have spring brakes You should be sure the converter dolly air tank drain valves are _______ & the pintle hook is __________. some large trucks have curved (convex or spot) mirrors. If you leave this page, your progress will be lost. safe speed would be 40 MPH. The coupling between a rear trailer and a dolly should have a space between the upper and lower fifth wheels of? Air pressure is sent from the air tanks to the brakes by relay valves. 8. 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. Why is there still destructive interference? What do you check when making a visual check of coupling? Should the shut-off valves on the trailers be open or closed on a set of double trailers? Hit the article to see the way to back up your trailer like a pro! Seriously! They are filled by the emergency (supply) line from the tractor. Doubles and triples are more likely to turn over than other combination vehicles because of the "crack-the-whip" effect. B. open; latched B. you need about four times as much stopping distance at 40 mph as at 20 mph You should NOT: You are driving a set of doubles and a set of trailer wheels goes into a skid. door. Which of these are the correct positions for shut-off valves in doubles and triples? The driver must yield the right-of-way to other vehicles when merging and when entering a highway from an alley. The trailer is at the correct height when. The dolly tow bar may fly up, possibly causing injury and making it very difficult to re-couple. 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. C. the service brakes slowly move to the fully applied position, Some large trucks have converted or "spot" mirrors. When coupling twin trailers, a converter dolly is. Each trailer and converter dolly has one or more air tanks. 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. Take this same test in our other testing modes How to Get a Hazardous Materials Endorsement, What is a CDL? The crack the whip effect will topple the rear trailer first. 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. c. iron You are doing a walk around inspection of a double or triple trailer rig. Take special care when pulling two and three trailers. Park on level ground, put chock on the tires, and charge the air tank. This means. 12, 3. The emergency brakes come on whenever the air supply knob is pulled out or the trailer is disconnected. C. fully raised, Which of these statements about speed management and braking is true? 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Which of these is most likely to occur? 0000007487 00000 n You open the emergency line shut-off valve at the rear of the last trailer and hear air escaping. How can you test that air flows to all trailers? weather passes. If it goes low enough, the trailer emergency brakes will come on. The pintle hook? While inspecting your converter dolly coupling, you should make sure there is _______ between the upper and lower fifth wheel. A To prevent trailers from rolling over, you must steer gently and go slowly around corners, on ramps, off ramps and curves. B. restore traction to the tires NPT thumbscrew style design enables easy installation. 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 are driving a 100 foot twin trailer combination at 50 mph. Which is most likely to tip over: By clicking on "Sign Up", you agree to our Terms of Use and Privacy Policy. We'll help you make the right choices and prepare for a great start to your trucking career. Air will not be available to release the trailer spring brakes (parking brakes). Before coupling a trailer, you should make sure it is at the right height using? Provides a snug fit to eliminate unwanted seepage of air or water. Which of these statements about quick steering movements and doubles/triples is true? 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.