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Doubles and triples must be driven very smoothly to avoid rollover or jacknife. The couplers have a rubber seal that prevents air from escaping. What should you check for when inspecting the converter dolly and the pintle hook? The word part ferrit- means: You should be sure the converter dolly air tank drain valves are _____ and the pintle hook is _____. 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: When checking the fifth wheel, you should make sure that it has enough? A driver of a vehicle with double or triple trailers will have greater length and more dead axles to pull, increasing the likelihood of a wreck. 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. air escape from the open valve The rear trailers shut-off valves should be open and the front closed. [California Commercial Driver Handbook] The weight of a truck: Is a major factor affecting stopping distance. 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. what is likely to happen if the pintle hook is unlocked with the dolly still under the second trailer? High Road 2.0! 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. To do this without wheel chocks you should: Empty trucks: When parking your double or triple combination, you should look for a parking space NPT thumbscrew style design enables easy installation. 7. You MUST have air all the way to the back for all the brakes to work. Often do not have spring brakes How much space should be between the upper and lower fifth wheel? A. you can steer more quickly and safely if you hold the wheel with one hand When uncoupling a rear trailer, you should remove some weight from the dolly by? Each trailer and converter dolly has one or more air tanks. Help your friends discover what it takes to become a successful truck driver. 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. Open Our normal business hours are Monday-Friday 8 a.m. to 5 p.m. (Pacific Time). B. the emergency line valve open and release air View the full article to see how to set cruise control correctly! Which of the following must be connected when coupling tractor to trailer or trailer to trailer? The crack the whip effect that troubles trucks with trailers. The pressure in the service line tells how much pressure the relay valves should send to the trailer brakes. The converter dolly air tank drain valve on coupled double/triple trailers should be: Closed. 9. C. the service brakes slowly move to the fully applied position, Some large trucks have converted or "spot" mirrors. The rear trailer of a double Release Dolly breaks by opening the air tank petcock or if the dolly has a spring break, use the Dolly parking brake control . You wish to turn right from one two-lane, two-way street to another. Double and triple trailers increase not only the operators risk of safety, but also the other motorists around him. Only trailers designed to be pulled with another trailer behind it will have a shut off valve. The air lines will rupture The road is dry and visibility is good. 2003-2023 Chegg Inc. All rights reserved. Converter dollies have spring brakes. They are not only longer, but also need more space because they cannot be turned or stopped suddenly. "Glad hands" are coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer. When the road is slippery If there are no dummy couplers, the glad hands can sometimes be locked together (depending on the couplings). Question 3 Explanation: All of the above. 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? Calculate the Mach number at section 2. Explore now! However, converter dollies and trailers built before 1975 are not required to have spring brakes. Some areas of concern are discussed below. A B. are the easiest to stop since there is no shifting cargo Be certain you are clear at the sides before changing lanes. What should you check for when inspecting the converter dolly? The service air line is only used to control the service brakes (when you press on the brake pedal or use the trailer hand-valve). A) closed . If you have traffic on both sides of your vehicle and something is blocking your lane, a move to the right still be best. What is one function of the tractor protection valve? With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. 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. The last trailer in a combination is most likely to turn over. a. blood Because of this, which of the following vehicle parts is most likely to tip over? 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; . New! When turning a double or triple at an intersection, the turn often cannot be completed without swinging wide. You are doing a walk around inspection of a double or triple trailer rig. 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. Air flows steadily and isentropically through a passage. Use the dummy couplers when the air lines are not connected to a trailer. 5. They provide the air pressure used to operate trailer brakes. If spare tire is on converter gear (dolly), make sure it is secured. 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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 connecting the glad hands, press the two seals together with the couplers at a 90-degree angle to each other. 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. 1/32 to 3/32 of an inch. At section 2 downstream, the speed is 519 m/s. We'll help you make the right choices and prepare for a great start to your trucking career. You may not notice a major leak in the service line until you try to put the brakes on. 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. True! The last trailer in a combination is most likely to turn over. While inspecting your converter dolly coupling, you should make sure there is _____ between the upper and lower fifth wheel. Use controlled or stab braking True False True If you want to couple a second trailer to you combiantion vehicle, secure it by using the: Trailer emergency air brakes. 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 If your tractor protection valve doesn't work properly, then if an air hose starts to leak what could happen? 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? To test the tractor protection valve, charge the trailer air brake system, turn off the engine, and 0000008894 00000 n This has the same value as the %%TIME_ALLOWED%% Variable on the Final Screen. A. open When you go to the rear of the last trailer, what should you do to complete this check? A. completely open You are doing a walkaround inspection of a double or triple trailer rig. This has the same value as the %%TIME_USED%% Variable on the Final Screen. Clean the couplers and rubber seals before a connection is made. Time used (Requires timer add on). The Verge logo. You must stop, yield to traffic and pedestrians, and only proceed when safe. A. use a low gear B. slow to a safe speed before entering the curve, then accelerate slightly through it How do you check to make sure the trailer height is correct before coupling? You can find it here: High Road 2.0. C. fully raised, Which of these statements about speed management and braking is true? If the converter dolly is close to your semitrailer, you should wheel it into position? When you turn with the tractor/triple trailer combination the wheels that off-track (cheat) the most are: You should check trailer height before connecting a converter dolly to a second or third trailer. Ship to Store. The trailer is at the correct height when. Which of these is the correct answer? Converter dollies are connected to front trailers with a? True! Ensuring the safety of the public starts with a thorough inspection of all equipment. Some do. In a certain electronic device, a three-stage amplifier is desired, whose overall voltage gain is 42 dB. You are driving a 100 foot twin trailer combination at 50 mph. These valves permit closing the air lines off when another trailer is not being towed. CDL License Requirements State By State. You should NOT: All material on this website is copyrighted. The topics with which you will want to be expertly familiar are: There isnt as much information to be studied in the classroom or in the CDL manual regarding doubles and triples, so in-lot and on-the-road practice will help you pass this test. A. hand valve Which the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the trailer. Remember however, that is just a suggestion. The trailer height is right when: The trailer will be raised slightly when the converter dolly is backed under it. While inspecting your converter dolly coupling, you should make sure there is _______ between the upper and lower fifth wheel. 0000005733 00000 n Any trailer with a reduced ground clearance You should reduce your speed by about _____ on a wet road. A 0000008187 00000 n Please visit using a browser with javascript enabled. door. be coupled to the rear of a tractor-trailer combination forming a hexagon bottom rig, A coupling device of one or two axles and a fifth wheel by which a semitrailer can be All other trailer air functions use the emergency line. Never, 9. We wish you the best of luck in your endeavors and are pleased to be of assistance. to re-capture 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. slow to safe speed before entering, then accelerate slightly through the curve. 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. B. restore traction to the tires Air Storage and Drain Tanks: Air storage tanks are used to hold compressed air. Driving doubles/triples is also more dangerous in hot and cold weather driving, as well as on mountain roads. C. posted speed limits on curves are safe for all trucks, Empty trucks: Which of the following will probably happen if you are driving a double rig and a set of trailer wheels goes into a skid? A full trailer behind a truck 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? Any items you have not completed will be marked incorrect. Stay up to date on truck driving industry news. You should avoid traveling next to others when possible. A 360 degree area of awareness is D A connection device of one axle used to disconnect a semitrailer combination vehicle then there is a problem with the ABS system. . You should not hear air escaping. When checking your air lines, they must be secure and? A low air buzzer will go off indicating something is wrong and either the front or the B. use only the trailer brakes Visually check to make sure that the lead trailer is slightly higher than the center of A. Before coupling a trailer, you should make sure it is at the right height using? Opening the shut off valves on the rear most trailer will ensure the lines are flowing After 15 years on the road I wanted to help people understand the trucking industry and everything that came with the career and lifestyle of an over the road trucker. The pintle hook? B. johnson bar locked . The braking systems of double and triple trailers are different than those of straight trucks because doubles and triples. The trailer height is right when: The trailer will be raised slightly when the converter dolly is backed under it. The number and size of air tanks varies among vehicles. open, closed, closed: Term. Hb```f``b`c``e@ (Q6_* You are visually checking the coupling of a converter dolly to the rear trailer. Slow to a safe speed before entering the curve, then coast through the curve. 4. 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: Should the converter dolly air-tank drain valve be open or closed on a double trailer combination? How do you check to make sure trailer height is correct before coupling? If this lamp is illuminated and does not go out, 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. They are filled by the emergency (supply) line from the tractor. 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? Submit your email at the end of the test. 1 You are doing a walk around inspection of a double or triple trailer rig. What does the drivers 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. 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. you are driving on a slippery road during the day. These mirrors: The number of correct answers. with the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the trailer. 0000007508 00000 n The dolly tow bar may fly up What three methods can you use to secure a second trailer before coupling? Before you can supply air to the air tanks of a second trailer you need to. Disconnect the glad-hand at the front of the first trailer and listen for air flow. It is very important to keep the air supply clean. Usually need a glad hand converter Antilock Braking Systems on Converter Dollies, Converter dollies built on or after March 1, 1998, are required to have antilock brakes. the road is dry & visibility is good. With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. C You should keep at least ____ seconds of space ahead of you. you are doing a walkaround inspection of a double or triple trailer rig. Unless you are draining the condensation out of the air tank, then the drain valve When coupling, be sure to couple the proper glad hands together. You can test that air is flowing to all trailers by opening? speed and start spinning again, in turn stopping your skid, All the listed answers would be correct. recouple. A CDL is required to drive any of the following vehicles: A vehicle with two separate parts - the power unit (tractor) and the trailer. What value of channel width must the design use? A D Pull gently against the pin of the second trailer. There is no obligation whatsoever. King pin. Make a sketch that explains this phenomenon in terms of a feedback loop . driven with care to avoid losing control, Make sure the spare tire is secured, if it has one, Make sure the converter dolly air tank drain valve is closed, Make sure safety chains are secured to the trailers, All of the above. 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. You open the emergency line shut-off valve at the rear of the last trailer and hear air escaping. Doubles and triples are more likely to overturn than other combination vehicles because of the whip cracking effect. 27. Shut off valves are only used on trailers designed to be towed in conjunction with other trailers (doubles / triples). 2. Pull gently against the pin of the second trailer. A. allow "much more space" than is needed for ideal driving conditions That split second that you release the brakes will allow them to match the vehicles road Push the brake pedal as hard as you can and hold it there This section explains how important it is to be careful when driving with more than one trailer, how to couple and uncouple correctly, and about inspecting doubles and triples carefully. 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. That there is some space between the upper and lower fifth wheel.