What three methods can you use to secure a second trailer before coupling? Which f these will result in the best control on curves? Newer trailers have spring brakes just like trucks and truck tractors. Should the pintle hook be latched or unlatched when backing a dolly under the second trailer? These trailers have no parking brake. Air escape from the open valve Terms in this set (43) Converter dollies are used to connect: A tractor-trailer combination to another trailer. There is no obligation whatsoever. Make sure trailer height is correct. you should avoid traveling next to others when possible. slow to safe speed before entering, then accelerate slightly through the curve. The converter dolly air tank drain valve on coupled double/triple trailers should be: You are driving a 100-feet truck with double trailers at 50 mph. Open, free Safety should never take second place, so know your stuff! kingpin. Some large trucks have curved (convex or spot) mirrors. To do this without wheel chocks you should: When uncoupling the rear semitrailer, you should lower the converter dolly landing gear: When driving a double or triple, you need more space because they: Which of these statements about emergency steering is true? King pin. Refers to pulling two trailers at the same time, otherwise known as "pups" or "pup trailers" because they're only about 28 feet long. Which of these is most likely to occur? 1. The converter dolly is an auxiliary axle with a coupling device. utilize the brakes. Like a trailer, a dolly equipped with ABS will have a yellow indicator light on the left side. C. posted speed limits on curves are safe for all trucks, Empty trucks: B. 3. your vehicle is so long that you must swing wide to make a turn. Remember: The trailer air brakes are supplied with air using the emergency line (also called the supply line). Be sure air-lines are supported and glad hands are properly connected. 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! But the brakes will hold only as long as there is air pressure in the trailer air tank. You should NOT: You are driving a set of doubles and a set of trailer wheels goes into a skid. We wish you the best of luck in your endeavors and are pleased to be of assistance. If you are driving a 200-foot triple at 35 mph, what is the minimum amount of space (in seconds) that you should keep ahead of you? You will not be tested on uncoupling twins unless you want to get a double/triple trailer endorsement on your license. What value of channel width must the design use? Page 7-6 Commercial Driver's Manual/2.0 = Be sure air lines are supported and glad hands are properly connected. Ensuring the safety of the public starts with a thorough inspection of all equipment. The road is dry and visibility is good. Flammable materials in the front trailer then it must have the placards on that trailer. True False True If you want to couple a second trailer to you combiantion vehicle, secure it by using the: Trailer emergency air brakes. Visually check to make sure that the rear trailer is slightly lower than the center of the Only a certified diesel mechanic can check this. D This will let the rear wheels roll again and keep the rear wheels from sliding. Air escape from the open valve You are driving with double trailers and must use your brakes to avoid a crash. if you have traffic on both sides of your vehicle and something is blocking your lane, a move to the right still be best. Describe what the trailer air supply control does. and the converter dolly air tank drain valve should be _____. CDL: Doubles/Triples Flashcards | Quizlet B With the red knob pushed in on the tractor dash, the service line should have air in it. Use controlled or stab braking 0000001162 00000 n A major leak in the emergency line will cause the tractor protection valve to close and the trailer emergency brakes to come on. There is no obligation whatsoever. You should be sure the converter dolly air tank drain valves are _______ & the pintle hook is __________. A dolly should be pulled out from a rear trailer using? 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. Pull gently against the pin of the second trailer. DOUBLE/TRIPLE CDL Flashcards | Chegg.com 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? This will supply air to the emergency (supply) lines. When connecting a converter dolly to a rear trailer, the trailer height must be adjusted so that it is? D 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. You will have greater length and more dead axles to pull with your drive axles than other drivers. 0000007508 00000 n CDL License Requirements State By State. 9 Which of these is the correct answer? To help avoid mistakes, colors are sometimes used. 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. with the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the trailer. If you do, the brakes may not work correctly. Amazon.com: Air Tank Drain Valve If you leave this page, your progress will be lost. 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. Shut-off valves (at rear of trailers, in service and emergency lines): When pulling doubles or triples, what is important to know about the order of the trailers? Double and triple trailers increase not only the operators risk of safety, but also the other motorists around him. To do this without wheel chocks you should: Empty trucks: When parking your double or triple combination, you should look for a parking space Open the emergency line shut-off valve at the rear of the last trailer. Each trailer and converter dolly has one or more air tanks. Go to Section 4: Other Topics This question is in Section 4: Other Topics of our CDL Test Guide. 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. B Select the answer that correctly completes each statement. If you crossed the air lines, you could drive away, but you would not have trailer brakes. D Should I Be A Truck Driver? 3. If this lamp is illuminated and does not go out, How To Use Cruise Control Effectively As A Truck Driver. 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]. Why is there still destructive interference? C. 3, You are doing a walk around inspection of a double or triple trailer rig. 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. The puzzle: At the far left edge, the plates are in contact, so the path length difference between rays 222 and 333 is zero. Be certain you are clear at the sides before changing lanes. 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. Follow the procedures described later in this section. The crack the whip effect will topple the rear trailer first. behind the shut-off valve then they need to remain open. Doubles and triples are more likely to turn over than other combination vehicles because of the "crack-the-whip" effect. Types of converter dollies. Air will not be available to release the trailer spring brakes (parking brakes). A. allow "much more space" than is needed for ideal driving conditions Once you have coupled your rear trailer, you should test the coupling by? Locking jaws open 0000010705 00000 n 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. Always unlock the pintle hook with the dolly still under the rear trailer. 2023 PA Doubles - Triples CDL Practice Test 3 - CristCDL.com If spare tire is carried on converter gear (dolly), make sure it's secured. which of these statements about quick steering movements and doubles/triples is true? Therefore, it is very important for safety that you use wheel chocks when you park trailers without spring brakes. In order to receive your Doubles and Triples endorsement, it is required that you pass the state's official CDL written Knowledge exam. Correct answer percentage. The pressure in the service line tells how much pressure the relay valves should send to the trailer brakes. A-dolly. When testing trailer service brakes, you should use? Clean the couplers and rubber seals before a connection is made. 7.3 Inspecting Doubles and Triples = Additional Things to Check During a Walkaround Inspection. The total number of questions. . Release Dolly breaks by opening the air tank petcock or if the dolly has a spring break, use the Dolly parking brake control . How much space should be between the upper and lower fifth wheels? This has the same value as the %%PERCENTAGE%% Variable on the Final Screen. Why should you not use the trailer hand valve while driving? you are driving on a slippery road during the day. 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. 0000004689 00000 n Florida CDL Handbook | FL CDL Handbook Coupling & Uncoupling for When does the Driver's manual say you should disable the steering axle brake? When does the "driver's manual" advise disconnecting the steering axle brakes to help keep the rig straight? What is one function of the tractor protection valve? first check for battery voltage to the valve by probing the wires of the electrical connector with a volt-meter it should be about 10.5 volts if not it's probably bad.next remove the valve. Charge the system and pump the brakes with the window down. You want to lock your combination to a second trailer that has no spring brakes. 0000001354 00000 n rear trailer. which of these is not a good thing to do when driving on slippery roads? Please visit using a browser with javascript enabled. Blue is used for the service lines, and red for the emergency (supply) lines. You will speak with recruiters today. Please use the form below to contact our customer service or sales team. Converter dolly air tank drain valve: CLOSED Air lines supported and glad hands properly connected. You must treat a flashing red signal as you would treat a STOP sign. Wait for air pressure to reach normal, then push in the red trailer air supply knob. Slow to the safe speed before entering, then accelerate slightly through the curve. Antilock Braking Systems on Converter Dollies, Converter dollies built on or after March 1, 1998, are required to have antilock brakes. Hazardous materials must be placarded on all four sides of EACH Trailer. The heavier trailer should be in the rear. When you go to the rear of the last trailer, what should you do to complete this check? 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: Doubles and triples must be driven very smoothly to avoid rollover or jackknife. go to the rear of the second trailer and open the emergency line shut off, before you can supply air to the air tanks of the second trailer you need too, open the shut-off valves at the rear of the first trailer & close the shut-off valves at the rear of the second trailer. Please wait while the activity loads. Safety fail-safe features of a tractor-trailer converter dolly. Leave a Reply Cancel reply - Free CDL Practice Tests 2022 Should the converter dolly air-tank drain valve be open or closed on a double trailer combination? A major leak in the emergency line will cause the tractor protection valve to close and the trailer emergency brakes to come on. You are driving a triple trailer and there is a loss of air pressure in the emergency line. B. restore traction to the tires True or False? With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. Connect Converter Dolly to Rear Trailer Make sure trailer brakes are locked and/or wheels chocked. The air lines will rupture A Do converter dollies have spring brakes? A 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. 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. This has the same value as the %%TOTAL%% Variable on the Final Screen. A. brake and downshift in a curve The number of correct answers. You should check the height of the trailer before connecting a converter dolly to a second or third trailer. B Before coupling a trailer, you should make sure it is at the right height using? C. foot pedal, Which of these statements about managing space to the sides is true? Connect the Converter Dolly to the Rear Trailer: Test the coupling by pulling against the pin of the second semitrailer. What happens when there is a major leak in the emergency air line? B. you should avoid traveling next to others whenever possible Push the brake pedal as hard as you can and hold it there For emergency braking you should: A Push the brake pedal as hard as you can and hold it there B D. Make sure the spare tire is secured, if it has one. 1/32 to 3/32 of an inch. You are doing a walk around inspection of a double or triple trailer rig. will have a lamp on the drivers side. how much space should be between the upper and lower fifth wheel? 0000008915 00000 n When doing a walkaround inspection of a double or triple trailer, the shut-off valves should be _______ at the rear(s) of the front trailer(s) and ________ at the rear of the last trailer. Pull gently against the pin of the second trailer. A full trailer behind a truck To check if the converter dolly is securely coupled to the rear trailer you should: Pull gently against the pin of the second trailer. Time used (Requires timer add on). Make sure the converter dolly air tank drain valve is closed. Visually check to make sure that the lead trailer is slightly higher than the center of trailer << /Size 59 /Info 20 0 R /Root 22 0 R /Prev 29211 /ID[] >> startxref 0 %%EOF 22 0 obj << /Type /Catalog /Pages 19 0 R >> endobj 57 0 obj << /S 66 /Filter /FlateDecode /Length 58 0 R >> stream allow "much more space than is needed for ideal driving conditions". You MUST have air all the way to the back for all the brakes to work. Lock pintle hook. You are doing a walk around inspection of a double or triple trailer We are here to help. 5. We are an independent company focused on providing valuable motor vehicle and permit practice test information. A) one inch of space . Secure converter gear support in raised position. C. closed, You can release the dolly brakes by: The shut off valves prevent air from going any further. Each trailer and converter dolly has one or more air tanks. DMV Doubles Triples Practice Test | CDL Knowledge B. 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 They provide the air pressure used to operate trailer brakes. Stop the vehicle by gearing down and sparingly 0000008166 00000 n The driver must yield the right-of-way to other vehicles when merging and when entering a highway from an alley. B. for doubles and triples, the fifth wheel should be all the way towards the tractor They provide the air pressure used to operate trailer brakes. The dolly tow bar may fly up, possibly causing injury and making it very difficult to re-couple. 0000010783 00000 n You must steer gently when pulling trailers. Submit your email at the end of the test. C you should not, when you turn with the tractor/triple trailer combination the wheels that offtrack(cheat) the most are. you should check the trailer height before connecting a converter dolly to a second or third trailer. These dollies will have a yellow lamp on the left side of the dolly. 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. C Good speed management says you should: You must drive through deep or flowing water. B Which trailer should come first behind the tractor? 0000003977 00000 n The Verge logo. 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: you are driving a set of doubles and a set of trailer wheels goes in a skid. That split second that you release the brakes will allow them to match the vehicles road Locking jaws closed on Flashcards - Doubles Tripes Test #4 - FreezingBlue S-cam brakes are the most common style brakes on large trucks today. Learn more and apply here: TruckingTruth was founded by Brett Aquila (that's me! B. releasing the pintle hook Use the engine brake or speed retarder. When only pulling one trailer, be sure the shut-off valves are all in the fully closed position. What three methods can you use to secure a second trailer before coupling? The road is dry and the visibility is good. B Any trailer, 7. Air flows steadily and isentropically through a passage. Learn more and apply here: The more heavily loaded semitrailer should be in first position behind the tractor. A Commercial Drivers License Overview, Trucking Terminology and Transportation Definitions. When you do this, you should hear: Make sure you have large enough gaps before entering or crossing traffic. How do you check to make sure trailer height is correct before coupling? When the road is slippery These valves permit closing the air lines off when another trailer is not being towed. Finsbury Pump Systems 400l (Single Stage) 5.5hp Honda Gx Petrol Engine B. use only the trailer brakes 0000002636 00000 n B. the emergency line valve open and release air How can you test that air flows to all trailers? [Flashing Signals, Traffic Signals, Chapter 5 - Signals, Signs and Pavement Markings, North Carolina Driver's Handbook], One component of the DUI sentence in the state of Tennessee is twenty-four hours of litter pick-up wearing clothing that says "I am a drunk driver." C Which of the following will probably happen if you are driving a double rig and a set of trailer wheels goes into a skid? you are doing a walkaround inspection of a double or triple trailer rig. The converter dolly air tank drain valve on coupled double/triple High Road 2.0! To prevent trailers from rolling over, you must steer gently and go slowly around corners, on ramps, off ramps and curves. You should keep at least ___ seconds of space ahead of you. True! Doubles/triples flip flop over from quick steering moves more easily than many vehicles. when driving a truck with more than one trailer, which trailer should be first behind the truck?