Closed, latched 2. You can reset the test and retake it as needed. you are driving a set of doubles and a set of trailer wheels goes in a skid. On a triple combination, the shutoff valves on the rear of the last trailer should be? You are driving a 100-feet truck with double trailers at 30 mph. 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. For emergency braking you should: A Push the brake pedal as hard as you can and hold it there B Refers to pulling two trailers at the same time, otherwise known as "pups" or "pup trailers" because they're only about 28 feet long. We'll help you make the right choices and prepare for a great start to your trucking career. These dollies will have a yellow lamp on the left side of the dolly Questions You Should Know For Doubles And Triples 1. Park the rear trailer against another trailer, chock the tires and lock the trailer When driving doubles or triples how should they be driven to avoid rollover or jackknifing: These mirrors: 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. 0000007508 00000 n While inspecting your converter dolly coupling, you should make sure there is _____ between the upper and lower fifth wheel. What does the drivers manual say about how much space you should keep ahead of your truck? The converter dolly air tank drain valve on coupled double/triple trailers should be: Answer: Closed. 2) the second test is to go out to the trailer to ensure that the parking brakes have indeed applied. CDL Doubles and Triples Test Question and Answers 2023 [PDF]: Commercial Drivers License Doubles and Triples Endorsements Knowledge Test. A. open Lock pintle hook. 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? Compressed air usually has some water and some compressor oil in it. Which trailer should come first behind the tractor? Should I Be A Truck Driver? On a triple combination, the shutoff valves at the rear off the middle trailer should be? Speed for other vehicles is often too fast for a multi-combination unit! You should hear air escaping, showing the entire system is charged. Make sure you have large enough gaps before entering or crossing traffic. 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. doubles/triples flip flop over from quick steering movements more easily than many other vehicles. Visually check to make sure that the rear trailer is slightly lower than the center of the 0000008166 00000 n should remain in the closed position. True False True If you want to couple a second trailer to you combiantion vehicle, secure it by using the: Trailer emergency air brakes. D B They provide the air pressure used to operate trailer brakes. The emergency brakes come on whenever air pressure in the emergency line is lost. C Doubles and triples must be driven very smoothly to avoid rollover or jackknife. Which f these will result in the best control on curves? This has the same value as the %%TOTAL%% Variable on the Final Screen. 2. D 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. When entering a roundabout, a driver must yield the right-of-way to drivers already in the roundabout and obey all traffic signs. View the full article to see how to set cruise control correctly! The pressure in the service line is controlled by the brake pedal and the trailer hand brake. When connecting the glad hands, press the two seals together with the couplers at a 90-degree angle to each other. C. closed, You can release the dolly brakes by: Use the dummy couplers when the air lines are not connected to a trailer. If your tractor protection valve doesn't work properly, then if an air hose starts to leak what could happen? B Delivering to. CDL License Requirements State By State. To do this without wheels chocks you should: Supply air to the trailer air system with the tractor and then disconnect the emergency line. Should the shut off valves on the rear of the first trailer be open or closed on a set of double trailers? Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? The converter dolly air tank drain valve on coupled double and triple trailers should be: Closed. When coupling twin trailers, a converter dolly is. You are driving with double trailers and must use your brakes to avoid a crash. a. blood Which is most likely to tip over: 0000001354 00000 n 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. The dolly tow bar may fly away, possibly causing panic, and making it very difficult When checking your air lines, they must be secure and? 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. Locking jaws closed on Doubles and triples are more likely to turn over than other combination vehicles because of what effect? Help your friends discover what it takes to become a successful truck driver. That split second that you release the brakes will allow them to match the vehicles road 0000003261 00000 n In order to receive your Doubles and Triples endorsement, it is required that you pass the states official CDL written Knowledge exam. re-couple, You can if you want to, it does not matter. You wish to turn right from one two-lane, two-way street to another. The driver will be required to complete this requirement in three eight hour shifts. These dollies will have a yellow lamp on the left side of the dolly. B C. engaging the tractor valve protection control, You must drive through deep or flowing water. Either the front or the rear brakes will not work properly or fully. There are more things that can go wrong, and doubles/triples are less stable than other commercial vehicles. 2003-2023 Chegg Inc. All rights reserved. Blue is used for the service lines, and red for the emergency (supply) lines. B The dolly tow bar may fly up Once that's complete, then its an easy push back and the A-dolly. The dolly will have a yellow lamp on the drivers (left) side. Visually check to make sure that the lead trailer is slightly higher than the center of Why is there still destructive interference? b. cell There are more critical parts to check when you have two or three trailers. behind the shut-off valve then they need to remain open. The shut off valves prevent air from going any further. If you have traffic on both sides of your vehicle and something is blocking your lane, a move to the right still be best. True! which of these statements about managing space to the sides is true? What do you check when making a visual check of coupling? 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. Any items you have not completed will be marked incorrect. You open the emergency line shut-off valve at the rear of the last trailer and hear air escaping. 0000006383 00000 n C A low air buzzer will go off indicating something is wrong and either the front or the A bent or damaged kingpin on a coupling should be? If spare tire is carried on converter gear (dolly), make sure it's secured. the crack-whip effect that triubkes trucks with trailers is most likely to cause a tip over when. You should keep at least ____ seconds of space ahead of you. You can also reach us at (888) 830-2326. Simply click in your answer to each CDL practice test question. Should the converter dolly air-tank drain valve be open or closed on a double trailer combination? In normal operation, trailer service brakes should be operated by? ADVERTISEMENT ADVERTISEMENT You shouldn't stop braking. Go to the rear of second trailer and open the emergency line shut-of valve. Allow more following distance. If this activity does not load, try refreshing your browser. The air lines will rupture This means. dress gifs. A Open, latched B Open, free C Closed, latched D Closed, free 28. You are driving a triple trailer and there is a loss of air pressure in the emergency line. 60607. Your tractor protection valve control should pop out, or go from normal to emergency position, when air pressure falls into what range? Submit your email at the end of the test. You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. Any single vehicle with a GVWR of 26,001 or more pounds, or any such vehicle towing another not in excess of 10,000 pounds. None Safety fail-safe features of a tractor-trailer converter dolly. It is important to check the height of the trailer before connecting a converter dolly to a trailer. You are visually checking the coupling of a converter dolly to the rear trailer. S-cam brakes are the most common style brakes on large trucks today. Make sure to visually inspect the fifth wheel and that the locking mechanism is You should keep at least ____ seconds of space ahead of you. ), a 15 year truck driving veteran, in January 2007. Doubles and triples must be driven very smoothly to avoid rollover or jacknife. The lightest trailer If loading fails, click here to try again. All other trailer air functions use the emergency line. Air will not be available to release the trailer spring brakes (parking brakes). 1 Trailer Air Tanks And Shutoff Valves - Page 50. when testing the coupling of a double trailer the landing gears of the rear trailer should be, you must drive through deep or flowing water . 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. C. closed; unlatched, Which of these will result in the best control on a curve? Which of these is most likely to occur? New! 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. There are more things that can go wrong, and doubles/triples are less stable than other commercial vehicles. D. Make sure the spare tire is secured, if it has one. A full trailer behind a truck These valves permit closing the air lines off when another trailer is not being towed. Related Question Question: What does this sign mean? A dolly has lights, air tanks, air relays, air lines, air brakes, ABS, electrical connections, etc. When connecting a converter dolly to a rear trailer, the trailer height must be adjusted so that it is? 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. When the road is dry A Open Usually need a glad hand converter To do this without wheel chocks you should: Empty trucks: When parking your double or triple combination, you should look for a parking space 12, 3. 9 Questions You Must Ask, Decide if Truck Driving is The Correct Career Path, Do Not Sell or Share My Personal Information. Park on level ground, put chock on the tires, and charge the air tank. 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.

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