0000003977 00000 n Ideal for replacing a worn, leaky drain valve on a compressor. When uncoupling a rear trailer, your rig should be parked in a straight line on? What should you check for when inspecting the converter dolly and the pintle hook? 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. To do this without wheels chocks you should: Supply air to the trailer air system with the tractor and then disconnect the emergency line. 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? That split second that you release the brakes will allow them to match the vehicles road The application only takes one minute. Open 0000001354 00000 n A truckers workspace is a small moving office Read More. What three methods can you use to secure a second trailer before coupling? kingpin. The shut off valves, when in the open position, allows air to flow out to another trailer. These mirrors: Make things seem smaller and further away than they really are. allow "much more space than is needed for ideal driving conditions". A major leak in the emergency line will cause the tractor protection valve to close and the trailer emergency brakes to come on. D Doubles and triples are more likely to turn over than other combination vehicles because of the "crack- the-whip" effect. You can reset the test and retake it as needed. 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. Each trailer and converter dolly has one or more air tanks. You should keep at least ___ seconds of space ahead of you. Ensuring the safety of the public starts with a thorough To check that the trailer emergency brakes are working properly, you should pull out the trailer air supply control and? Eventually, the air will leak away, and then there will be no brakes. The dolly tow bar may fly away, possibly causing panic, and making it very difficult When driving a double or triple trailer, greater care must be given to. For emergency braking you should: May have poor traction due to bouncing and wheels lockup. On the middle trailer of a set of triples? We'll help you make the right choices and prepare for a great start to your trucking career. You should keep at least _____ seconds of space ahead of you. True False True If you want to couple a second trailer to you combiantion vehicle, secure it by using the: Trailer emergency air brakes. Sometimes, metal tags are attached to the lines with the words service and emergency stamped on them. You should keep at least ____ seconds of space ahead of you. B. releasing the pintle hook A connection device of one axle used to disconnect a semitrailer combination vehicle If loading fails, click here to try again. The trailer height is right when: The trailer will be raised slightly when the converter dolly is backed under it. When you are pulling trailers, which of the following statements is true about steering? 0000008894 00000 n View More Details. The last trailer in a combination is most likely to turn over. If the converter dolly is close to your semitrailer, you should wheel it into position? Leave the emergency line shut-off valve closed and open the service line valve. With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. When coupling twin trailers, you should _______ the pintle hook and secure the dolly support in the _______ position. You are driving with double trailers and must use your brakes to avoid a crash. [California Commercial Driver Handbook] The weight of a truck: Is a major factor affecting stopping distance. securely fastened. You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. The road is dry, and visibility is good. 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 A-dolly has a single drawbar with a single, centered hitching point. How much space should be between the upper and lower fifth wheel? The road is dry and visibility is good. 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. locked . Please visit using a browser with javascript enabled. B. keep gentle pressure on the brakes while going through the water and for a short distance after coming out C. always keep your vehicle to the left side of your lane, When testing the coupling of double trailers, the landing gear of the rear trailer should be: you are doing a walkaround inspection of a double or triple trailer rig. Do converter dollies have spring brakes? This is CDL Doubles and Triples Test 3in our original Classic Mode. NPT thumbscrew style design enables easy installation. How can you test that air flows to all trailers? Never, 9. not have spring brakes. door. Hazardous materials must be placarded on all four sides of EACH Trailer. 1/2 to 3/4 of an inch Use controlled or stab braking 0000003261 00000 n Any vehicle, regardless of size, designed to transport 16 or more persons, including the driver. The dolly tow bar may flip up causing bodily injury and making it very difficult to Sketch the shape of the passage between sections 1 and 2. What three methods can you use to secure a second trailer before coupling? In the coupling system, the locking jaws should be fixed around? Locking jaws closed on Unlock the pintle hook only if the trailer it is under is loaded, otherwise the dolly tow bar may fly up, possibly causing injury and making it very difficult to re-couple. Always test the trailer brakes before driving with the hand valve or by pulling the air supply (tractor protection valve) control. which of these is not a good thing to do when driving on slippery roads? You open the emergency line shut-off valve at the rear of the last trailer and hear air escaping. If one air system is very low on pressure _______. 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. Unless you are draining the condensation out of the air tank, then the drain valve Studying and applying oneself is the only way to successfully learn the information you need to know to pass all testing required to obtain your CDL. Double and triple trailers increase not only the operators risk of safety, but also the other motorists around him. Either the front or the rear brakes will not work properly or fully. Should the pintle hook be latched or unlatched when backing a dolly under the second trailer? 0000006195 00000 n A dolly has lights, air tanks, air relays, air lines, air brakes, ABS, electrical connections, etc. air throughout the system. Open the shut-off valves at the rear of the last trailer and listen for air flow. These dollies will have a yellow lamp on the left side of the dolly Questions You Should Know For Doubles And Triples 1. If you have traffic on both sides of your vehicle and something is blocking your lane, a move to the right still be best. C Describe what the trailer air supply control does. a. blood You must stop, yield to traffic and pedestrians, and only proceed when safe. Antilock Braking Systems on Converter Dollies, Converter dollies built on or after March 1, 1998, are required to have antilock brakes. 0000005733 00000 n 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. Only trailers designed to be pulled with another trailer behind it will have a shut off valve. Any time you have to You are visually checking the coupling of a converter dolly to the rear trailer. Which is most likely to tip over: how can you be sure you supplied air to a second trailer? It is important to check the height of the trailer before connecting a converter dolly to a trailer. Should the shut-off valves on the trailers be open or closed on a set of double trailers? Make sure the converter dolly air tank drain valve is closed. 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. Therefore, it is very important for safety that you use wheel chocks when you park trailers without spring brakes. A. open the shut-off valves at the rear of both trailers 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 lightest trailer Mar 2 - Mar 3. The driver must yield the right-of-way to other vehicles when merging and when entering a highway from an alley. 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; . Open the emergency line shut-off valve at the rear of the last trailer. Always unlock the pintle hook with the dolly still under the rear trailer. If this activity does not load, try refreshing your browser. 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. The lighter semitrailer should be in first position behind the tractor. slow to safe speed before entering, then accelerate slightly through the curve. What types of trailers can get stuck on raised crossings? D Make sure you can hear air escaping with the valve closed. Which f these will result in the best control on curves? However there are some states that allow doubles that are each 48 feet in length. A B. are the easiest to stop since there is no shifting cargo Opening the shut off valves on the rear most trailer will ensure the lines are flowing On a triple combination, the shutoff valves on the rear of the last trailer should be? In normal operation, trailer service brakes should be operated by? Time limit varies by state. Hb```f``b`c``e@ (Q6_* fumoto drain valve. you should avoid traveling next to others when possible. C. 3, You are doing a walk around inspection of a double or triple trailer rig. B 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. Some do. ADVERTISEMENT ADVERTISEMENT . 0000001162 00000 n which of these statements about the handling of doubles and triples is true ? Flammable materials in the front trailer then it must have the placards on that trailer. 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. A Open, latched B Open, free C Closed, latched D Closed, free 28. C 0000002636 00000 n 0000010705 00000 n The emergency brakes come on whenever the air supply knob is pulled out or the trailer is disconnected. By clicking on "Sign Up", you agree to our Terms of Use and Privacy Policy. How do you check to make sure trailer height is correct before coupling? Which of the following statements about off tracking is true? When you do this, you should hear: To prevent trailers from rolling over, you must steer gently and go slowly around corners, on ramps, off ramps and curves. A. use light, steady pressure on the brake pedal When testing trailer service brakes, you should use? cQ 220rd8bihuM#Om>G*Lz)g^\l9'A9/omf|b49U[@%jGT-QR6i. Go to Section 4: Other Topics This question is in Section 4: Other Topics of our CDL Test Guide. Air escape from the open valve 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. 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? 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? Do converter dollies have spring brakes? There are more things that can go wrong, and doubles/triples are less stable than other commercial vehicles. C. use controlled or stab braking, The best way to stop any skid is to: Which of the following will occur? They are filled by the emergency (supply) line from the tractor. A. air escape from the open valve 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 Doubles and triples are more likely to overturn than other combination vehicles because of the whip cracking effect. Once you have coupled your rear trailer, you should test the coupling by? 0000001775 00000 n B A Commercial Drivers License Overview, Trucking Terminology and Transportation Definitions. These valves permit closing the air lines off when another trailer is not being towed. 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. Your tractor protection valve control should pop out, or go from normal to emergency position, when air pressure falls into what range? How should you test the coupling? The front trailer in a set of double trailers is most likely to turn over due to the Crack-the-Whip effect. Slow to the safe speed before entering, then accelerate slightly through the curve. Tractor-trailers are considered combination vehicles. None of the above, 5. Pull gently against the pin of the second trailer. Trucks with trailers have a dangerous crack-the-whip effect. 8. It is important not to let water and oil build up in the air tanks. Dont hesitate to take advantage of our practice tests in each category specific to your needs. Many scientists are concerned that the melting of Earth's sea ice will increase Earth's surface temperature. B. you need about four times as much stopping distance at 40 mph as at 20 mph 4. 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 When uncoupling a rear trailer, you should remove some weight from the dolly by? B. allow one vehicle length for every 10,000 lbs of gross vehicle weight Clean the couplers and rubber seals before a connection is made.

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