the converter dolly air tank drain valve should be

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. Remember, the service line is not used unless you depress the brake pedal or use the trailer hand valve. Allow more following distance. 1/32 to 3/32 of an inch. 11 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. The road is dry and the visibility is good. your vehicle is so long that you must swing wide to make a turn. B Doubles and triples must be driven very smoothly to avoid rollover or jackknife. Converter dolly air tank drain valve: CLOSED. C The word part ferrit- means: When driving a truck with more than one trailer, which trailer should be first behind the truck? With the red knob pushed in on the tractor dash, the service line should have air in it. 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. Calculate the voltage gain of each. cQ 220rd8bihuM#Om>G*Lz)g^\l9'A9/omf|b49U[@%jGT-QR6i. ), a 15 year truck driving veteran, in January 2007. Shut-off valves (at rear of trailers, in service and emergency lines): When pulling doubles or triples, what is important to know about the order of the trailers? Air pressure is sent from the air tanks to the brakes by relay valves. 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 can also reach us at (888) 830-2326. A CDL is required to drive any of the following vehicles: A vehicle with two separate parts - the power unit (tractor) and the trailer. 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 Hit the article to see the way to back up your trailer like a pro! When uncoupling, you should never unlock the _______ with the dolly still under the rear trailer. Doubles and triples are more likely to turn over than other combination vehicles because of what effect? To check air flows to all trailers, you should let air pressure reach normal then? A vehicle transporting hazardous materials is required to display placards where? What does the drivers manual say about how much space you should keep ahead of your truck? B. the emergency line valve open and release air What happens when there is a major leak in the emergency air line? That there is no space between upper and lower fifth wheel. Converter dollies: 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. When you do this, you should hear: Ais escape from the open valve. A. closed; latched A. air escape from the open valve . Take special care when pulling two and three trailers. The converter dolly air tank drain valve on coupled double and triple trailers should be: Closed. Connect Converter Dolly to Rear Trailer Make sure trailer brakes are locked and/or wheels chocked. Page 7-6 Commercial Driver's Manual/2.0 = Be sure air lines are supported and glad hands are properly connected. The dolly tow bar may fly up That there is no space between upper and lower sixth wheel. which of these statements about quick steering movements and doubles/triples is true? b. cell 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. "Glad hands" are coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer. The individual voltage gains of the first two stages are to be equal, while the gain of the third is to be one-fourth of each of the first two. True False True If you want to couple a second trailer to you combiantion vehicle, secure it by using the: Trailer emergency air brakes. you are doing a walkaround inspection of a double or triple trailer rig. Slow to the safe speed before entering, then accelerate slightly through the curve. 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. With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. When you do this, you should hear: you are driving with double trailer and must use your brakes to avoid a crash. The dolly will have a yellow lamp on the drivers (left) side. Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? 0000004689 00000 n Be certain you are clear at the sides before changing lanes. Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? When driving doubles or triples how should they be driven to avoid rollover or jackknifing: You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. B. keep other traffic out of your side space Simply click in your answer to each CDL practice test question. In normal operation, trailer service brakes should be operated by? B A dolly has lights, air tanks, air relays, air lines, air brakes, ABS, electrical connections, etc. What does the Driver's manual say about how much space you should keep ahead of your truck? 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. On double and triple combinations, you must make sure that which of these is secure? That split second that you release the brakes will allow them to match the vehicles road Those that do not have spring brakes have emergency brakes that work from the air stored in the trailer air tank. symptoms of a bad fuel tank selector switch. Release Dolly breaks by opening the air tank petcock or if the dolly has a spring break, use the Dolly parking brake control . The trailer brakes will unlock Safety fail-safe features of a tractor-trailer converter dolly. It is very important to keep the air supply clean. 4. Air escape from the open valve You are driving with double trailers and must use your brakes to avoid a crash. A low air buzzer will go off indicating something is wrong and either the front or the Help your friends discover what it takes to become a successful truck driver. inspection of all equipment. But the brakes will hold only as long as there is air pressure in the trailer air tank. Hazardous materials must be placarded on all four sides of EACH Trailer. A truckers workspace is a small moving office Read More. The application only takes one minute. Doubles and triples must be driven very smoothly to avoid rollover or jackknife. The road is dry and visibility is good. 0000004668 00000 n A Open, latched B Open, free C Closed, latched D Closed, free 28. There are more things that can go wrong, and doubles/triples are less stable than other commercial vehicles. The road is dry, and visibility is good. All ABS equipped units A. completely open Leave the emergency line shut-off valve closed and open the service line valve. Terms in this set (43) Converter dollies are used to connect: A tractor-trailer combination to another trailer. 12, 3. the road is dry & visibility is good. What should you check for when inspecting a converter dolly? Which of these is the correct answer? A thorough pre-trip inspection should catch any major service line leaks before you begin your trip. This is CDL Doubles and Triples Test 3in our original Classic Mode. 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. do not need to be checked as often as flat mirrors because they show a larger area 10 None then there is a problem with the ABS system. If the spring brakes do not release when you push the trailer air supply control, check the air line connections. behind the shut-off valve then they need to remain open. Seriously! The Doubles and Triples written CDL Exam is required for your doubles and triples endorsement. 0000010285 00000 n 0000001162 00000 n 10. All of the above, 6. Charge the system and pump the brakes with the window down. Make sure trailer height is correct. However, converter dollies and trailers built before 1975 are not required to have spring brakes. In bad weather, slippery conditions and mountain driving, you must be especially careful if you drive double and triple bottoms. 2003-2023 Chegg Inc. All rights reserved. B. closed 2) the second test is to go out to the trailer to ensure that the parking brakes have indeed applied. TestPermit.com provides free unofficial review materials for a variety of exams. 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: Make sure pintle hook is latched. Visually check to make sure that the lead trailer is slightly higher than the center of Related Question Question: What does this sign mean? Like a trailer, a dolly equipped with ABS will have a yellow indicator light on the left side. This will let the rear wheels roll again and keep the rear wheels from sliding. It depends on the load They are filled by the emergency (supply) line from the tractor. They provide the air pressure used to operate trailer brakes. ADVERTISEMENT ADVERTISEMENT A. require shorter stopping distances than full ones 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. To do this without wheels chocks you should: Supply air to the trailer air system with the tractor and then disconnect the emergency line. 9 Questions You Must Ask, Decide if Truck Driving is The Correct Career Path, Do Not Sell or Share My Personal Information. If the converter dolly is close to your semitrailer, you should wheel it into position? 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 weather passes. 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. C. use controlled or stab braking, The best way to stop any skid is to: you should not, when you turn with the tractor/triple trailer combination the wheels that offtrack(cheat) the most are. C Some areas of concern are discussed below. 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. Which of the following will probably happen if you are driving a double rig and a set of trailer wheels goes into a skid? The dolly tow bar may flip up causing bodily injury and making it very difficult to Hook dolly to front trailer. True! B. slightly raised B. you need about four times as much stopping distance at 40 mph as at 20 mph B. for doubles and triples, the fifth wheel should be all the way towards the tractor C. the service brakes slowly move to the fully applied position, Some large trucks have converted or "spot" mirrors. B A coupled to the rear of a tractor-trailer combination forming a double bottom rig, Careful of the wording! 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. On the middle trailer of a set of triples? A sudden movement with the steering wheel can result in a tipping over rear trailer. A Connect the Converter Dolly to the Rear Trailer: Test the coupling by pulling against the pin of the second semitrailer. 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. B. open; latched 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. Question 3 Explanation: All of the above. The crack the whip effect that troubles trucks with trailers. C The trailer height is right when: The trailer will be raised slightly when the converter dolly is backed under it. 3. For emergency braking you should: A Push the brake pedal as hard as you can and hold it there B 0000009556 00000 n Only a certified diesel mechanic can check this. Trailer Air Tanks And Shutoff Valves - Page 50. A. open Therefore, look far ahead so you can slow down or change lanes gradually when necessary. This has the same value as the %%TIME_ALLOWED%% Variable on the Final Screen. Any vehicle required by federal regulations to be placarded while transporting hazardous materials. 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. They are filled by the emergency (supply) line from the tractor. When entering a roundabout, a driver must yield the right-of-way to drivers already in the roundabout and obey all traffic signs. What do you check when making a visual check of coupling? Open the emergency line shut-off valve at the rear of the last trailer. C 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 Closed, latched A. opening the air tank petcock You should reduce your speed by about _____ on a wet road. B HlTo xGf`{iIMh-x||?pbE':X4ZZZRbu7 uvi_RHUkVXBVu{^B3 4e/iw\]RE] YY7i)e V*h(++WQ-]Xm9c5yU6BS" 5HiL,[b)ee:t/ )%BVGpU7T\ZJD Nothing, the weight of the trailer will keep it in place, 10. 9 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. What is a converter dolly? When uncoupling a rear trailer, you should remove some weight from the dolly by? Before coupling a trailer, you should make sure it is at the right height using? 1 There is no obligation whatsoever. the crack-whip effect that triubkes trucks with trailers is most likely to cause a tip over when. You MUST have air all the way to the back for all the brakes to work. We wish you the best of luck in your endeavors and are pleased to be of assistance. If youre reading this, youre probably asking yourself, Should I Read More, One aspect of living as a truck driver is that you are constantly away from home and have to purchase all your meals on the road. You must stop, yield to traffic and pedestrians, and only proceed when safe. When uncoupling doubles or triples, what is important to know about unlocking the pintle hook? Speed for other vehicles is often too fast for a multi-combination unit! Which of the following will occur? You are visually checking the coupling of a converter dolly to the rear trailer. 60607. The last trailer in a combination is most likely to turn over. rear trailer. A converter dolly is a piece of equipment designed to allow commercial trucks, such as semi-trucks, to pull a trailer. Good speed management says you should: You must drive through deep or flowing water. 7.3 Inspecting Doubles and Triples = Additional Things to Check During a Walkaround Inspection. You should keep at least ___ seconds of space ahead of you. Please wait while the activity loads. You must steer gently when pulling trailers. %PDF-1.2 % Locking jaws closed on can and will get stuck on a raised railroad crossing. 0000001107 00000 n How do you know if your converter dolly is equipped with antilock brakes? The braking systems of double and triple trailers are different than those of straight trucks because doubles and triples.