What is a converter dolly? 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. 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. When uncoupling a rear trailer, your rig should be parked in a straight line on? These dollies will have a yellow lamp on the left side of the dolly Questions You Should Know For Doubles And Triples 1. CDL License Requirements State By State. and the converter dolly air tank drain valve should be _____. second trailer will be connected, The dolly will have a yellow lamp on the left side, The dolly will have a yellow lamp on the right side, The dolly will have a red lamp on the left side, The dolly will have a red lamp on the right side. unsafe slow down even further, or better yet, find a safe haven and park until the Speed for other vehicles is often too fast for a multi-combination unit! Open 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 It is important to check the height of the trailer before connecting a converter dolly to a trailer. What is a converter dolly? Wait for air pressure to reach normal, then push in the red trailer air supply knob. you are doing a walkaround inspection of a double or triple trailer rig. You are doing a walk around inspection of a double or triple trailer rig. not have spring brakes. That split second that you release the brakes will allow them to match the vehicles road Try our free CDL Doubles and Triples Test Question and Answers Quiz online. Allow more following distance. Hit the article below to see specific information about AOBRDs! CDL Doubles and Triples Test Question and Answers 2023 [PDF]: Commercial Drivers License Doubles and Triples Endorsements Knowledge Test. Doubles and triples are more likely to turn over than other combination vehicles because of the "crack- the-whip" effect. It's a fifth wheel, not a sixth wheel. A. brake and downshift in a curve They are filled by the emergency (supply) line from the tractor. What should you check for when inspecting the converter dolly? Pull gently against the pin of the second trailer. The puzzle: At the far left edge, the plates are in contact, so the path length difference between rays 222 and 333 is zero. What value of channel width must the design use? Be certain you are clear at the sides before changing lanes. 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: axle will have spring brakes due to the weight of the unit. Also available in App Store & Google Play. D. Make sure the spare tire is secured, if it has one. Make sure you can hear air escaping with the valve closed. Study section 6.2 if you can't answer all of these questions. A Allow much more space than is needed for ideal driving condition. A 360 degree area of awareness is You should be sure the converter dolly air tank drain valves are _____ and the pintle hook is _____. You should keep at least ____ seconds of space ahead of you. The final procedure when connecting a rear trailer is to? Double and Triples Endorsement Flashcards 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. 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: Doubles and triples must be driven very smoothly to avoid rollover or jackknife. 0000001582 00000 n Go to Section 4: Other Topics This question is in Section 4: Other Topics of our CDL Test Guide. Chock the tires, park on level ground and charge the trailer air tank if it does However there are some states that allow doubles that are each 48 feet in length. There are more things that can go wrong, and doubles/triples are less stable than other commercial vehicles. You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. Close the emergency line shut-off valve at the rear of the trailer. They are filled by the emergency (supply) line from the tractor. Ensuring the safety of the public starts with a thorough B The road is dry and the visibility is good. Time allowed (Requires timer add on). Some areas of concern are discussed below. Check them all. 0000003261 00000 n Take special care when pulling two and three trailers. B. slightly raised Which of these is most likely to occur? They provide the air pressure used to operate trailer brakes. Which the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the trailer. 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 these statements about the handling of doubles and triples is true? 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. 12, 3. 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. 0000010783 00000 n Delivering to. 0000003998 00000 n They provide the air pressure used to operate trailer brakes. 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. While inspecting your converter dolly coupling, you should make sure there is _____ between the upper and lower fifth wheel. There are more things that can go wrong, and doubles/triples are less stable than other commercial vehicles. 2. C. fully raised, Which of these statements about speed management and braking is true? Flammable materials in the front trailer then it must have the placards on that trailer. You should not hear air escaping. Connect Converter Dolly to Rear Trailer Make sure trailer brakes are locked and/or wheels chocked. You are driving with double trailers and must use your brakes to avoid a crash. Email Updates When New Articles Are Posted. should remain in the closed position. This will let the rear wheels roll again and keep the rear wheels from sliding. When you're trying to correct a drive-wheel braking skid why should you stop braking? You should be sure the converter dolly air tank drain valves are _____ and the pintle hook is ____. These mirrors: Make things seem smaller and further away than they really are. kingpin, That there is grease between upper and lower fifth wheel. By clicking on "Sign Up", you agree to our Terms of Use and Privacy Policy. 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. A The converter dolly is an auxiliary axle with a coupling device. The number and size of air tanks varies among vehicles. The road is dry and visibility is good. To do this without wheel chocks you should: Empty trucks: When parking your double or triple combination, you should look for a parking space 0000008915 00000 n allow "much more space than is needed for ideal driving conditions". Eventually, the air will leak away, and then there will be no brakes. Light cords firmly in sockets on trailer. Locking jaws closed on mTouch Quiz will automatically populate the fields below. When you go to the rear of the last trailer, what should you do to complete this check? This has the same value as the %%TIME_ALLOWED%% Variable on the Final Screen. Flashcards - Doubles Tripes Test #4 - FreezingBlue The converter dolly air tank drain valve on coupled double/triple Their drawbars differentiate them. recouple. Converter dollies have spring brakes. 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. A low air buzzer will go off indicating something is wrong and either the front or the Double/Triple Flashcards | Quizlet To test the tractor protection valve, charge the trailer air brake system, turn off the engine, and With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. Calculate the net energy change in kilojoules per mole that takes place on formation of MgF2_22(s) from the elements: Heat of sublimation for Mg(s) = 147.7 kJ/mol Eea_{ea}ea for F(g) = -328 kJ>mol, Bond dissociation energy for F2_22(g) = 158 kJ>mol Ei1_{i1}i1 for Mg(g) = 737.7 kJ>mol, Electrostatic interactions in MgF2_22(s) = -2957 kJ/mol Ei2_{i2}i2 for Mg(g) = 1450.7 kJ/mol. 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. Do converter dollies have spring brakes? Becoming A Truck Driver is a dream we've all pondered at some point in our lives. 10 When checking the fifth wheel, you should make sure that it has enough? The pintle hook should always be secure when the vehicle is in motion. 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. Any combination of vehicles with a gross combined weight rating (GCWR) of 26,001 or more pounds, providing the gross vehicle weight rating (GVWR) of the vehicle being towed is in excess of 10,000 pounds. Stay up to date on truck driving industry news. 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. for doubles and triples, the fifth wheel should be all the way towards the tractor Finsbury Pump Systems 400l (Single Stage) 5.5hp Honda Gx Petrol Engine . All ABS equipped units However, converter dollies and trailers built before 1975 are not required to have spring brakes. A B. slightly open 0000008166 00000 n when driving a truck with more than one trailer, which trailer should be first behind the truck? The last trailer in a combination is most likely to turn over. Before you can supply air to the air tanks of a second trailer you need to. You should reduce your speed by about _____ on a wet road. 0000009556 00000 n Each tank has a drain valve on it, and you should drain each tank every day. You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. C. foot pedal, Which of these statements about managing space to the sides is true? Air will not be available to release the trailer spring brakes (parking brakes).