To help avoid mistakes, colors are sometimes used. 0000001354 00000 n
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. At section 2 downstream, the speed is 519 m/s. 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. There is a school zone ahead. Trailer Air Tanks And Shutoff Valves - TruckingTruth A. completely open Once you are finished, click the button below. We'll help you make the right choices and prepare for a great start to your trucking career. If spare tire is carried on converter gear (dolly), make sure it's secured. 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 bent or damaged kingpin on a coupling should be? Seriously! How can you test that air flows to all trailers? you are driving on a slippery road during the day. With the red knob pushed in on the tractor dash, the service line should have air in it. 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 last trailer in a combination is most likely to turn over. You are driving a tractor with multiple trailers. On a triple combination, the shutoff valves on the rear of the last trailer should be? the crack-whip effect that triubkes trucks with trailers is most likely to cause a tip over when. A-dolly. What three methods can you use to secure a second trailer before coupling? If your tractor protection valve doesn't work properly, then if an air hose starts to leak what could happen? Either the front or the rear brakes will not work properly or fully. 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? 2023 WV Doubles - Triples CDL Practice Test 1 - CristCDL.com Safety chains should be secured to trailer(s). 0000009577 00000 n
The final procedure when connecting a rear trailer is to? D B. pull gently against the pin of the second semitrailer To do this without wheels chocks you should: Supply air to the trailer air system with the tractor and then disconnect the emergency line. The road is dry and visibility is good. 0000007032 00000 n
Before you can supply air to the air tanks of a second trailer you need to. "Glad hands" are coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer. the rig will continue moving in a straight line no matter how much the steering wheel is turned. HlTo xGf`{iIMh-x||?pbE':X4ZZZRbu7 uvi_RHUkVXBVu{^B3
4e/iw\]RE] YY7i)e V*h(++WQ-]Xm9c5yU6BS" 5HiL,[b)ee:t/ )%BVGpU7T\ZJD 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. 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: 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. Time allowed (Requires timer add on). Converter dolly air tank drain valve: CLOSED. What is a converter dolly? 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. Dobles - Triples Pruebas de prctica 3 - NJ 2023 - CristCDL.com CDL: Doubles/Triples Flashcards | Quizlet When you go to the rear of the last trailer, what should you do to complete this check? If you do, there is a problem. 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; . A CDL is required to drive any of the following vehicles: A vehicle with two separate parts - the power unit (tractor) and the trailer. A. always keep your vehicle to the right side of your lane 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 are the correct positions for shut-off valves in doubles and triples? To uncouple the rear trailer in a set of doubles, the shut-off valve at the rear of the front trailer should be: Closed. The road is dry, and visibility is good. 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 doing a walk around inspection of a double or triple trailer rig. which of these statements about quick steering movements and doubles/triples is true? Select the answer that correctly completes each statement. Be more careful in adverse conditions. Please visit using a browser with javascript enabled. Close the emergency line shut-off valve at the rear of the trailer. A Please wait while the activity loads. A. open to do this without wheel chocks you should: supply air to the trailer air system with the tractor and then disconnect the emergency line. A. fully lowered You open the emergency line shut-off valve at the rear of the last trailer and hear air escaping. You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. 2) the second test is to go out to the trailer to ensure that the parking brakes have indeed applied. Only a certified diesel mechanic can check this. Park the rear trailer against another trailer, chock the tires and lock the trailer You want to lock your combination to a second trailer that has no spring brakes. Connect the Converter Dolly to the Rear Trailer: Test the coupling by pulling against the pin of the second semitrailer. TestPermit.com provides free unofficial review materials for a variety of exams. There is no obligation whatsoever. The dolly tow bar may fly up, possibly causing injury, and making it very difficult to Submit your email at the end of the test. 5. Therefore, it is very important for safety that you use wheel chocks when you park trailers without spring brakes. Go to Section 4: Other Topics This question is in Section 4: Other Topics of our CDL Test Guide. There is no requirement or exact standard for color coding. The Home Depot Logo Question 4. 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 _____. A 360 degree area of awareness is Air escape from the open valve C slow to safe speed before entering, then accelerate slightly through the curve. You are driving a triple trailer and there is a loss of air pressure in the emergency line. A. opening the air tank petcock A. brake and downshift in a curve what is likely to happen if the pintle hook is unlocked with the dolly still under the second trailer? If you feel When uncoupling, you should never unlock the _______ with the dolly still under the rear trailer. All other trailer air functions use the emergency line. The puzzle: At the far left edge, the plates are in contact, so the path length difference between rays 222 and 333 is zero. Park on level ground, put chock on the tires, and charge the air tank. What is a converter dolly? When you are pulling trailers, which of the following statements is true about steering? That there is some space between the upper and lower fifth wheel. Converter dollies have spring brakes. Before you can supply air to the air tanks of a second trailer you need to: Open the shut-off valves at the rear of the first trailer and close the shut-off valves at the rear of second trailer. 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. Go to the rear of the rig. 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. Why should you not use the trailer hand valve while driving? How do you check to make sure the trailer height is correct before coupling? Take special care when pulling two and three trailers. A. allow "much more space" than is needed for ideal driving conditions What does the Commercial Driver Handbook say about how much space you should keep ahead of your truck? 1/3 For example: If you are traveling 60 MPH and it begins to rain, your suggested 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? 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. None 0000006195 00000 n
Secure converter gear support in raised position. The pressure in the service line tells how much pressure the relay valves should send to the trailer brakes. Which of these is the correct answer? 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. Leave the emergency line shut-off valve closed and open the service line valve. You should keep at least ___ seconds of space ahead of you. Disconnect the glad-hand at the front of the first trailer and listen for air flow. 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. Tractor-trailers are considered combination vehicles. B. use only the trailer brakes Locking jaws closed on A. countersteer Which of the following statements about off tracking is true? For emergency braking you should: You are doing a walk around inspection of a double or triple trailer rig. Air will not be available to release the trailer spring brakes (parking brakes).