Converter dollies: They are filled by the emergency (supply) line from the tractor. A turn of the glad hand attached to the hose will join and lock the couplers. The heaviest trailer Which of these statements about managing space to the sides is true? A thorough pre-trip inspection should catch any major service line leaks before you begin your trip. A) one inch of space . Their drawbars differentiate them. should remain in the closed position. Typically depends on the axle count. When checking the coupling system, make sure that the locking jaws are around the shank of the. Hb```f``b`c``e@ (Q6_* Should the pintle hook be latched or unlatched when backing a dolly under the second trailer? 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? B Provides a snug fit to eliminate unwanted seepage of air or water. Some vehicles have dead end or dummy couplers to which the hoses may be attached when they are not in use. Your vehicle is so long that you must swing wide to make the turn. you can fuck a pornstar craigslist cars and trucks for sale by owner; kd linear actuator kdpt007 what is ait in the army; native american spiritual cleansing prayer simple spectrum coupon code; . You are doing a walk around inspection of a double or triple trailer rig. C you should avoid traveling next to others when possible. Allow much more space than is needed for ideal driving condition. When entering a roundabout, a driver must yield the right-of-way to drivers already in the roundabout and obey all traffic signs. Make sure you do not get in a spot you cannot pull straight through. not have spring brakes. Types of converter dollies. You are driving a 100-feet truck with double trailers at 50 mph. Question 4. Calculate the Mach number at section 2. A low air buzzer will go off indicating something is wrong and either the front or the 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. There are more things that can go wrong, and doubles/triples are less stable than other commercial vehicles. Usually need a glad hand converter You open the emergency line shut-off valve at the rear of the last trailer and hear air escaping. and the converter dolly air tank drain valve should be _____. To test the tractor protection valve, charge the trailer air brake system, turn off the engine, and 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 Close the emergency line shut-off valve at the rear of the trailer. If you do, the brakes may not work correctly. retrovirus $_____________________________$. This will supply air to the emergency (supply) lines. Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? Which of the following will occur? There is a school zone ahead. A bent or damaged kingpin on a coupling should be? It depends on the load The converter dolly is an auxiliary axle with a coupling device. You should keep at least ____ seconds of space ahead of you. We'll help you make the right choices and prepare for a great start to your trucking career. 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. The trailer height is right when: The trailer will be raised slightly when the converter dolly is backed under it. B What do you check when making a visual check of coupling? The converter dolly air tank drain valve on coupled double/triple trailers should be: You are driving a 100-feet truck with double trailers at 50 mph. The word part ferrit- means: You can reset the test and retake it as needed. We are an independent company focused on providing valuable motor vehicle and permit practice test information. B. you should avoid traveling next to others whenever possible By clicking on "Sign Up", you agree to our Terms of Use and Privacy Policy. A Once that's complete, then its an easy push back and the 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 _____. The shut off valves, when in the open position, allows air to flow out to another trailer. fifth wheel, so trailer is raised slightly when dolly is pushed under it. 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 The crack the whip effect will topple the rear trailer first. When you do this, you should hear: Which of these statements about emergency steering is true? 0000010783 00000 n 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. A You should be sure the converter dolly air tank drain valves are _____ and the pintle hook is _____. D Select the answer that correctly completes each statement. View the full article to see how to set cruise control correctly! you are driving on a slippery road during the day. Converter dollies have spring brakes. Go to the rear of the rig. When the road is dry what is likely to happen if the pintle hook is unlocked with the dolly still under the second trailer? 9 27. Allow more following distance. The pintle hook? How can you test that air flows to all trailers? 12, 3. Connect the Converter Dolly to the Rear Trailer: Test the coupling by pulling against the pin of the second semitrailer. Doubles and triples must be driven very smoothly to avoid rollover or jackknife. CDL Doubles and Triples Test Question and Answers 2023 [PDF]: Commercial Drivers License Doubles and Triples Endorsements Knowledge Test. For all brakes to work on a triple combination, you must have air supply? Pull gently against the pin of the second trailer. B. releasing the pintle hook Be sure pintle-eye of dolly is in place in pintle hook of trailer(s). The rear trailers shut-off valves should be open and the front closed. A converter dolly is still under the second trailer when you unlock the pintle hook. Open, free 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. Follow the procedures described later in this section. C. posted speed limits on curves are safe for all trucks, Empty trucks: You should be sure the converter dolly air tank drain . inspection of all equipment. Closed, free, 8. They provide the air pressure used to operate trailer brakes. For emergency braking you should: You are doing a walk around inspection of a double or triple trailer rig. D That there is no space between upper and lower fifth wheel. To do this without wheel chocks you should: Empty trucks: When parking your double or triple combination, you should look for a parking space Never, 9. You are visually checking the coupling of a converter dolly to the rear trailer. The braking systems of double and triple trailers are different than those of straight trucks because doubles and triples. 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. Tractor-trailers are considered combination vehicles. 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: Time limit varies by state. A dolly has lights, air tanks, air relays, air lines, air brakes, ABS, electrical connections, etc. A-dolly. What should you check for when inspecting the converter dolly? C. closed, You can release the dolly brakes by: The pressure in the service line tells how much pressure the relay valves should send to the trailer brakes. 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. When uncoupling a rear trailer, you should remove some weight from the dolly by? Which of the following must be connected when coupling tractor to trailer or trailer to trailer? Open the emergency line shut-off valve at the rear of the last trailer. If one air system is very low on pressure _______. The dolly tow bar may fly up Safety chains secured to trailer (s). By using this site, you agree to be bound by our Terms of Use, Privacy Policy and Cookie Policy, Copyright 2000-2023 MH Sub I, LLC dba Internet Brands. B. you need about four times as much stopping distance at 40 mph as at 20 mph 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. Dont hesitate to take advantage of our practice tests in each category specific to your needs. 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: A. air escape from the open valve 11 During normal operation the brakes of the double/triple trailer are controlled by: Open the emergency line shut-off valve at the rear of the last trailer. Correct answer percentage. 0000007508 00000 n You must treat a flashing red signal as you would treat a STOP sign. Becoming A Truck Driver is a dream we've all pondered at some point in our lives. If your tractor protection valve doesn't work properly, then if an air hose starts to leak what could happen? Each trailer and converter dolly has one or more air tanks. When does the Driver's manual say you should disable the steering axle brake? 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? Open the emergency line shut-off valve at the rear of the last trailer. Take this same test in our other testing modes How to Get a Hazardous Materials Endorsement, What is a CDL? B You must steer gently when pulling trailers. B. use only the trailer brakes If loading fails, click here to try again. You are driving with double trailers and must use your brakes to avoid a crash. A. use the engine brake or speed retarder 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. Locking jaws closed on a sudden movement with the steering wheel can result in a tipped over rear trailer, you wish to turn right from one two-lane, two-way street to another. You will not be tested on uncoupling twins unless you want to get a double/triple trailer endorsement on your license. This has the same value as the %%PERCENTAGE%% Variable on the Final Screen. 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. The application only takes one minute. and possible answers include: open, free or closed, latched or closed, free or open, latched from TruckersDouble & Triple Trailer (CDL) Endorsement. A connection device of one axle used to disconnect a semitrailer combination vehicle C. the service brakes slowly move to the fully applied position, Some large trucks have converted or "spot" mirrors. You should keep at least ____ seconds of space ahead of you. You are doing a walk around inspection of a double or triple trailer rig. Locking jaws closed on The trailer is at the correct height when. 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 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. Which the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the trailer. 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 Make sure you have large enough gaps before entering or crossing traffic. 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. 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 uncoupling a rear trailer, your rig should be parked in a straight line on? The rear trailer does not have shut-off valves. You can test that air is flowing to all trailers by opening? That there is no space between upper and lower sixth wheel. 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. How do you check to make sure trailer height is correct before coupling? Email Updates When New Articles Are Posted. Which of these is most likely too occur? Driving doubles/triples is also more dangerous in hot and cold weather driving, as well as on mountain roads. Mar 2 - Mar 3. Doubles and triples are more likely to turn over than other combination vehicles because of the "crack- the-whip" effect. On a triple combination, the shutoff valves on the rear of the last trailer should be? Why should you not use the trailer hand valve while driving? C You should keep at least ____ seconds of space ahead of you. HK Extended Tank Drain Assembly Kit with 10 Inch Braided Steel Hose 1/4 Inch Drain Valve and Elbow Fitting for Air Compressor 4.7 (463) $1499 FREE delivery Thu, Mar 9 on $25 of items shipped by Amazon Small Business All Tool Depot Air Compressor Drain Valve Replacement for Craftsman Petcock 072-0001, 072-0006 (1-Pack) 4.2 (20) $649 You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. 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? you should keep atleast __seconds of space ahead of you. That there is some space between the upper and lower fifth wheel. C. open, except the one connected to the rear trailer should be closed, During normal operation the brakes on double and triple trailers are controlled by the: When pulling a single trailer with a Shut-Off Valve, the valves must be in the: Trailers built before what year may not be equipped with trailer spring brakes? B. slightly open Why is there still destructive interference? A. always keep your vehicle to the right side of your lane 0000005554 00000 n All other trailer air functions use the emergency line. if you have traffic on both sides of your vehicle and something is blocking your lane, a move to the right still be best. Make sure you can hear air escaping with the valve closed.