the crack-whip effect that triubkes trucks with trailers is most likely to cause a tip over when. Chock the tires, park on level ground and charge the trailer air tank if it does A What's a converter dolly? Close the emergency line shut-off valve at the rear of the trailer. Tractor-trailers are considered combination vehicles. 1/4 in. If the spring brakes do not release when you push the trailer air supply control, check the air line connections. 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. Air will not be available to release the trailer spring brakes (parking brakes). Which of these statements about the handling of doubles and triples is true? We wish you the best of luck in your endeavors and are pleased to be of assistance. If your tanks have automatic drains, they will keep most moisture out, but you should still open the drains to make sure. Mar 2 - Mar 3. Locking jaws closed on 0000006195 00000 n you should keep atleast __seconds of space ahead of you. C. foot pedal, Which of these statements about managing space to the sides is true? How should the converter dolly air tank drain valve on coupled double You are doing a walkaround inspection of a double or triple trailer rig. Hook dolly to front trailer. These mirrors: Also, this page requires javascript. Clean the couplers and rubber seals before a connection is made. All of the above, 6. you are visually checking the coupling of a converter dolly to the rear trailer. if you have traffic on both sides of your vehicle and something is blocking your lane, a move to the right still be best. The trailer is at the correct height when. A. open Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? Before coupling a trailer, you should make sure it is at the right height using? Stay up to date on truck driving industry news. In bad weather, slippery conditions and mountain driving, you must be especially careful if you drive double and triple bottoms. 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: That split second that you release the brakes will allow them to match the vehicles road 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 dolly tow bar may fly up 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? 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. CDL License Requirements State By State. While inspecting your converter dolly coupling, you should make sure there is _____ between the upper and lower fifth wheel. The lighter trailer should be in the rear. A green traffic light allows the driver to go. The trailer height is right when: The trailer will be raised slightly when the converter dolly is backed under it. kingpin, That there is grease between upper and lower fifth wheel. [California Commercial Driver Handbook] The weight of a truck: Is a major factor affecting stopping distance. 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 _______. symptoms of a bad fuel tank selector switch. The pressure in the service line tells how much pressure the relay valves should send to the trailer brakes. 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 0000001775 00000 n Each trailer and converter dolly has one or more air tanks. Did you know you can fill out one quick form here on TruckingTruth and apply to several companies at once for paid CDL training? Hb```f``b`c``e@ (Q6_* You should be sure the converter dolly air tank drain valves are _______ and the pintle hook is _____. 60607. Antilock Braking Systems on Converter Dollies, Converter dollies built on or after March 1, 1998, are required to have antilock brakes. C. 3, You are doing a walk around inspection of a double or triple trailer rig. Learn more and apply here: TruckingTruth was founded by Brett Aquila (that's me! Which of the following will occur? When the road is dry You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. Pull gently against them in a low gear to make sure the brakes work. 2. Flammable materials in the front trailer then it must have the placards on that trailer. (done) Chp 23: Cash Flow + Working Capital, Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer. You need to brake in order to regain control. The converter dolly air tank drain valve on coupled double/triple trailers should be: Answer: Closed. %PDF-1.2 % 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. This means. If the dolly is a two axle unit then 1 recouple. Which of these is the correct answer? 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. the trailer will be raised slightly when the converter dolly is backed under it the best way to keep brakes from getting too hot while going down long grades is to : go slow and use only light, steady pressure on the brakes you are driving a 100ft truck with double trailers at 30mph. 0000008166 00000 n how much space should be between the upper and lower fifth wheel? CDL Doubles and Triples Test Question and Answers Visually check to make sure that the rear trailer is slightly lower than the center of the When the road is slippery The weight of the individual trailers will have no noticeable effect on the handling of the vehicle, The weight of all trailers should be nearly the same, within 2% of each other. For emergency braking you should: May have poor traction due to bouncing and wheels lockup. D. Make sure the spare tire is secured, if it has one. Correct answer percentage. If loading fails, click here to try again. When you are pulling trailers, which of the following statements is true about steering? The road is dry and visibility is good. You are driving with more than one trailer. A. closed; latched Never pull any trailer without visually inspecting the fifth wheel locking bar A. completely open When checking your air lines, they must be secure and? They provide the air pressure used to operate trailer brakes. If there is a trailer Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? True or False? B 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. We'll help you make the right choices and prepare for a great start to your trucking career. They provide the air pressure used to operate trailer brakes. Slow to a safe speed before entering the curve, then coast through the curve. Single axle converter dollies are the most common type of converter dolly used in the U.S. C-dolly The C-dolly has two separate couplings, side-by-side. Some areas of concern are discussed below. 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. A CDL is required to drive any of the following vehicles: A vehicle with two separate parts - the power unit (tractor) and the trailer. The road is dry and visibility is good. CDL: Doubles/Triples Flashcards | Quizlet None of the above, 2. Stop the vehicle by gearing down and sparingly Make sure to visually inspect the fifth wheel and that the locking mechanism is Doubles and triples must be driven very smoothly to avoid rollover or jacknife. Their drawbars differentiate them. to re-capture it. 10. You are driving a tractor with multiple trailers. Converter dolly air tank drain valve: CLOSED. When you do this, you should hear: you are driving with double trailer and must use your brakes to avoid a crash. _______ should be tested with the hand valve but controlled in normal operation with the foot pedal. A A 360 degree area of awareness is 1. Question 4. how can you be sure you supplied air to a second trailer? dress gifs. Contributor: Luke Nold (Experienced truck driver for 5+ years and published writer for Fleet Magazine). Converter dolly air tank drain valve: CLOSED Air lines supported and glad hands properly connected. Only a certified diesel mechanic can check this. D If the converter dolly is close to your semitrailer, you should wheel it into position? To uncouple the rear trailer in a set of doubles, the shut-off valve at the rear of the front trailer should be: Closed. 1 8. D C 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. This has the same value as the %%TIME_ALLOWED%% Variable on the Final Screen. Doubles and triples are extremely prone to control issues and must be Related Question Question: What does this sign mean? Open the emergency line shut-off valve at the rear of the last trailer. 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? d. protein. Any trailer, 7. When testing the coupling of the double trailer the landing gears of the rear trailer should be: You want to hook your combination to a second trailer that has no spring brakes. doubles/triples flip flop over from quick steering movements more easily than many other vehicles. You should not hear air escaping. Always unlock the pintle hook with the dolly still under the rear trailer. Seriously! 0000010783 00000 n A converter dolly is a piece of equipment designed to allow commercial trucks, such as semi-trucks, to pull a trailer. How should you test the coupling? B. you need about four times as much stopping distance at 40 mph as at 20 mph Which of these is most likely to occur? Park the rear trailer against another trailer, chock the tires and lock the trailer Time allowed (Requires timer add on). When you do this, you should hear: You should keep at least _____ seconds of space ahead of you: You are driving with double trailers and must use your brakes to avoid a crash. Flashcards - Doubles Tripes Test #4 - FreezingBlue Definition. 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. 0000001354 00000 n If you are only pulling one trailer, make certain the valve is fully in the closed position or it will leak air out of the air system. Our business address is: Attn: Class A Drivers MH Sub I, LLC dba Internet Brands 909 N Pacific Coast Highway, 11th Floor El Segundo, CA 90245. you are driving a set of doubles and a set of trailer wheels goes in a skid. Inspecting Doubles And Triples | High Road Online CDL Training Some large trucks have curved (convex or spot) mirrors. B Air Storage and Drain Tanks: Air storage tanks are used to hold compressed air. B. slightly raised Types of converter dollies. 0000010306 00000 n To help avoid mistakes, colors are sometimes used. 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