Go to Section 4: Other Topics This question is in Section 4: Other Topics of our CDL Test Guide. When you do this, you should hear: Converter dolly air tank drain valve: CLOSED. Open the emergency line shut-off valve at the rear of the last trailer. When coupling twin trailers, you should _______ the pintle hook and secure the dolly support in the _______ position. can and will get stuck on a raised railroad crossing. When connecting a converter dolly to a rear trailer, the trailer height must be adjusted so that it is? They are filled by the emergency (supply) line from the tractor. Email Updates When New Articles Are Posted. If you do, there is a problem. None of the above, 5. [California Commercial Driver Handbook] The weight of a truck: Is a major factor affecting stopping distance. Use the dummy couplers when the air lines are not connected to a trailer. A CDL is required to drive any of the following vehicles: A vehicle with two separate parts - the power unit (tractor) and the trailer. weather passes. 0000006015 00000 n doubles/triples flip flop over from quick steering movements more easily than many other vehicles. They provide the air pressure used to operate trailer brakes. C. When coupling doubles and triples, be sure that the pintle-eye of the dolly is in place in the pintle hook of the trailer, You are driving on a slippery road during the day. Page 7-6 Commercial Driver's Manual/2.0 = Be sure air lines are supported and glad hands are properly connected. Doubles and triples must be driven very smoothly to avoid rollover or jacknife. 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. You should reduce your speed by about _____ on a wet road. A converter dolly is still under the second trailer when you unlock the pintle hook. Because of this, which of the following vehicle parts is most likely to tip over? rear brakes will not work properly. 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. That there is some space between the upper and lower fifth wheel. Always test the trailer brakes before driving with the hand valve or by pulling the air supply (tractor protection valve) control. Ideal for replacing a worn, leaky drain valve on a compressor. axle will have spring brakes due to the weight of the unit. View the full article to see how to set cruise control correctly! Antilock Braking Systems on Converter Dollies, Converter dollies built on or after March 1, 1998, are required to have antilock brakes. If the spring brakes do not release when you push the trailer air supply control, check the air line connections. When the road is dry Air pressure is sent from the air tanks to the brakes by relay valves. Any vehicle, regardless of size, designed to transport 16 or more persons, including the driver. Doubles/triples flip flop over from quick steering moves more easily than many vehicles. 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. How do you check to make sure trailer height is correct before coupling? Any vehicle required by federal regulations to be placarded while transporting hazardous materials. If not, there is a problem. Converter dolly air tank drain valve: CLOSED Air lines supported and glad hands properly connected. 9 Questions You Must Ask, Decide if Truck Driving is The Correct Career Path, Do Not Sell or Share My Personal Information. 27. We'll help you make the right choices and prepare for a great start to your trucking career. The service brakes slowly move to the fully applied position Push the brake pedal as hard as you can and hold it there Only a certified diesel mechanic can check this. A. use a low gear ADVERTISEMENT ADVERTISEMENT You should NOT: The dolly will have a yellow lamp on the drivers (left) side. The total number of questions. _______ should be tested with the hand valve but controlled in normal operation with the foot pedal. Studying and applying oneself is the only way to successfully learn the information you need to know to pass all testing required to obtain your CDL. Question 4. Calculate the Mach number at section 2. A Commercial Drivers License Overview, Trucking Terminology and Transportation Definitions. 2003-2023 Chegg Inc. All rights reserved. B. you need about four times as much stopping distance at 40 mph as at 20 mph Pull gently against the pin of the second trailer. The dolly tow bar may fly up 3. you should keep atleast __seconds of space ahead of you. Once you have coupled your rear trailer, you should test the coupling by? when driving a truck with more than one trailer, which trailer should be first behind the truck? Be certain you are clear at the sides before changing lanes. 0000001582 00000 n [California Commercial Driver Handbook] The weight of a truck: Is a major factor affecting stopping distance. the crack-whip effect that triubkes trucks with trailers is most likely to cause a tip over when. 0000001956 00000 n If spare tire is on converter gear (dolly), make sure it is secured. True! Either the front or the rear brakes will not work properly or fully. When testing trailer service brakes, you should use? What is a converter dolly? You are doing a walk around inspection of a double or triple trailer rig. A. release the spring brakes and check for movement This will let the rear wheels roll again and keep the rear wheels from sliding. Eventually, the air will leak away, and then there will be no brakes. What's a converter dolly? Which is most likely to tip over: On a triple combination, the shutoff valves on the rear of the last trailer should be? 9. 1/4 in. The converter dolly is an auxiliary axle with a coupling device. If your tractor protection valve doesn't work properly, then if an air hose starts to leak what could happen? 10 Which of these statements about quick steering movements and doubles/triples is true? Like a trailer, a dolly equipped with ABS will have a yellow indicator light on the left side. You should be sure the converter dolly air tank drain valves are _______ & the pintle hook is __________. Mar 2 - Mar 3. Often do not have spring brakes The heaviest trailer 7. You have not finished your quiz. C The pressure in the service line tells how much pressure the relay valves should send to the trailer brakes. 0000001107 00000 n What do you check when making a visual check of coupling? 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 road is dry and visibility is good. 1/32 to 3/32 of an inch. Which of the following must be connected when coupling tractor to trailer or trailer to trailer? The rear trailers shut-off valves should be closed and the front open. Which is most likely to tip over: then there is a problem with the ABS system. On the middle trailer of a set of triples? paramount to safe driving. Then, the air loss from the leak will lower the air tank pressure quickly. If there is a trailer 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. Simply click in your answer to each CDL practice test question. To help avoid mistakes, colors are sometimes used. The pressure in the service line is controlled by the brake pedal and the trailer hand brake. Ship to Store. open, closed, closed: Term. Disconnect the glad-hand at the front of the first trailer and listen for air flow. Always unlock the pintle hook with the dolly still under the rear trailer. 0000008166 00000 n behind the shut-off valve then they need to remain open. 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: 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. with the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the trailer. For emergency braking you should: You are doing a walk around inspection of a double or triple trailer rig. The road is dry and the visibility is good. 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? A. make things look smaller and farther away than they really are Why should you use chocks when parking a trailer without spring brakes? The number and size of air tanks varies among vehicles. 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. Go to the rear of the rig. Park on level ground, put chock on the tires, and charge the air tank. Explore now! 12, 3. The rear trailer of a triple You should hear air escaping, showing the entire system is charged. At TruckingTruth we'll help you decide if trucking is right for you and help you get your career off to a great start. Each trailer and converter dolly has one or more air tanks. When does the "driver's manual" advise disconnecting the steering axle brakes to help When inspecting the air brakes on doubles and triples, you wait for air pressure to reach normal, then push in the red trailer air supply knob. 0000003261 00000 n %PDF-1.2 % They provide the air pressure used to operate trailer brakes. With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. B. releasing the pintle hook While inspecting your converter dolly coupling, you should make sure there is _______ between the upper and lower fifth wheel. Make a sketch that explains this phenomenon in terms of a feedback loop . A dolly has lights, air tanks, air relays, air lines, air brakes, ABS, electrical connections, etc. A converter gear or dolly is a coupling device of one or two axles and a fifth wheel by which a semi-trailer can be coupled to the rear of a tractor-trailer combination forming a double bottom. When entering a roundabout, a driver must yield the right-of-way to drivers already in the roundabout and obey all traffic signs. The emergency brakes come on whenever the air supply knob is pulled out or the trailer is disconnected. Should the shut-off valves on the rear of the last trailer be open or closed? Take special care when pulling two and three trailers. If your converter dolly has to be moved over a distance to bring it to your semitrailer, you should? Tractor-trailers are considered combination vehicles. converting it into two trailers, A coupling device of three or four axles and a fifth wheel by which a semitrailer can B. keep gentle pressure on the brakes while going through the water and for a short distance after coming out Open the emergency line shut-off valve at the rear of the last trailer. You should be sure the converter dolly air tank drain valves are _____ and the pintle hook is _____. 6. The shut off valves prevent air from going any further. 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. Go to the rear of second trailer and open the emergency line shut-of valve. Take special care when pulling two and three trailers. The application only takes one minute. A dolly is like a very short trailer, with a ring hitch on the front and a fifth wheel on top. recouple. Air pressure is sent from the air tanks to the brakes by relay valves. Any trailer, 7. 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. Close the emergency line shut-off valve at the rear of the trailer. Locking jaws closed on locked . You will speak with recruiters today. You are visually checking the coupling of a converter dolly to the rear trailer. Closed, latched In order to receive your Doubles and Triples endorsement, it is required that you pass the states official CDL written Knowledge exam. The application only takes one minute. 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. If you're pulling more than one trailer, all valves should be open except the very last trailer, which should have all valves in the closed position. Did you know you can fill out one quick form here on TruckingTruth and apply to several companies at once for paid CDL training? 0000002636 00000 n The dolly tow bar may fly up, possibly causing injury and making it very difficult to re-couple. D Nothing will happen, but an in-cab warning indicator will let you know about the problem, It will cause the tractor protection valve to close and the trailer emergency brakes to come on, It will cause the tractor protection valve to open and the trailer emergency brakes to come on, When you try to put the service brakes on, air will quickly leak and will lower the air tank pressure, possibly activating the trailer emergency brakes, The emergency brakes will come on automatically as soon as a major leak occurs, Nothing, but braking power will be reduced, Air pressure will quickly leak away, even if you are not using the service brakes, Using a combination of the emergency air line and the service air line, Supply air will be sent to the service line instead of going to charge the trailer air tanks which means the trailer spring brakes will not release, Newer vehicles automatically detect if the lines are crossed and will auto-correct itself, Air will continue filling the air holding tanks until the tanks rupture from excessive pressure, Supply air will cause all brakes to release and the truck will roll freely without any braking ability, Trailers typically do not have their own air tanks, Designed to turn off the truck engine when a brake failure occurs, Used in the service and supply air lines at the back of trailers used to tow other trailers, Placed at each trailer spring brake and are designed to engage the emergency brakes when air pressure becomes too high, The yellow and red air control knobs located in the cab of a truck, Used to secure the trailer kingpin to the tractor 5th wheel, Caps which cover the valve stems on tires, A name for the yellow and red air valves in the cab of a truck, Coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer, Email Updates When New Articles Are Posted. C. use a light touch on the accelerator and brake pedals, For coupled double and triple trailers, all of the converter dolly shut-off valves should be: Watch the wording of the question AND the answers A safe driver will look for all of the above. retrovirus $_____________________________$. All rights reserved 2022 TestPermit.com, CDL Doubles and Triples Test Question and Answers, Divided Highway Sign: Meaning, Quiz Definition, Example, Shape, Location, Color, Narrow Bridge Sign: Meaning, Quiz Definition, Example, Shape, Location, Color, STOP Sign 2023 Meaning, Quiz Definition, Example, Shape, Location, Color, Crossbuck Sign: Meaning, Definition, Example, Shape, Location, Color, Georgia CDL Permit Practice Test 2023 Study Guide [PDF], Georgia Motorcycle Permit Test 2023 with Study Guide [PDF], Georgia Permit Test 2023 (DDS Practice Test UPDATED), Georgia ADAP Practice Test 2023 Questions Answers Online, Ohio CDL Permit Practice Test 2023 Study Guide [PDF], Ohio Motorcycle Permit Test 2023 Study Guide [PDF]. You should NOT: You are driving a set of doubles and a set of trailer wheels goes into a skid. Related Question Question: What does this sign mean? The dolly tow bar may fly up, possibly causing injury, and making it very difficult to These dollies will have a yellow lamp on the left side of the dolly Questions You Should Know For Doubles And Triples 1. Pull gently against the pin of the second trailer. For emergency braking you should: There is more chance for skids and loss of traction. The dolly tow bar may flip up causing bodily injury and making it very difficult to 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.
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