Which f these will result in the best control on curves? If spare tire is carried on converter gear (dolly), make sure it's secured. If there are no dummy couplers, the glad hands can sometimes be locked together (depending on the couplings). There are two types of converter dollies. B. johnson bar When uncoupling, you should never unlock the _______ with the dolly still under the rear trailer. If it goes low enough, the trailer emergency brakes will come on. None of the above, 4. It depends on the load locked . For all brakes to work on a triple combination, you must have air supply? 2. B. slow to a safe speed before entering the curve, then accelerate slightly through it 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? 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: None Open the emergency line shut-off valve at the rear of the last trailer. Open, latched They provide the air pressure used to operate trailer 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. In a certain electronic device, a three-stage amplifier is desired, whose overall voltage gain is 42 dB. to do this without wheel chocks you should: supply air to the trailer air system with the tractor and then disconnect the emergency line. In order to receive your Doubles and Triples endorsement, it is required that you pass the states official CDL written Knowledge exam. C. back up slightly and make a visual check of the coupling, You are driving with double trailers and must use your brakes to avoid a crash. The shut off valves prevent air from going any further. You must stop, yield to traffic and pedestrians, and only proceed when safe. Ideal for replacing a worn, leaky drain valve on a compressor. Go to the rear of second trailer and open the emergency line shut-of valve. A dolly should be pulled out from a rear trailer using? you are doing a walkaround inspection of a double or triple trailer rig. Good speed management says you should: You must drive through deep or flowing water. safe speed would be 40 MPH. Safety chains should be secured to trailer(s). C Explain why the waves that reflect from the far left edge of the plates in the given figure earlier exhibit destructive interference (zero intensity) at x=0x=0x=0. If you leave this page, your progress will be lost. Which of these is the correct answer? 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. What is the most common foundation brake found on heavy vehicles? This will supply air to the emergency (supply) lines. They are filled by the emergency (supply) line from the tractor. When pulling a single trailer with a Shut-Off Valve, the valves must be in the: Trailers built before what year may not be equipped with trailer spring brakes? Should the pintle hook be latched or unlatched when backing a dolly under the second trailer? You may not notice a major leak in the service line until you try to put the brakes on. 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. Any trailer, 7. We are an independent company focused on providing valuable motor vehicle and permit practice test information. C. use stab or controlled braking, Which of these is true? When checking the fifth wheel, you should make sure that it has enough? 2 Make sure you can hear air escaping with the valve closed. Did you know you can fill out one quick form here on TruckingTruth and apply to several companies at once for paid CDL training? Please visit using a browser with javascript enabled. A. you can steer more quickly and safely if you hold the wheel with one hand 0000001375 00000 n Ensuring the safety of the public starts with a thorough inspection of all equipment. In order to supply air to the air tanks of a second trailer, you must ______ shut-off valves at the rear of the first trailer and ________ the shut-off valves at the rear of the second trailer. Refers to pulling two trailers at the same time, otherwise known as "pups" or "pup trailers" because they're only about 28 feet long. A bent or damaged kingpin on a coupling should be? Antilock Braking Systems on Converter Dollies, Converter dollies built on or after March 1, 1998, are required to have antilock brakes. %PDF-1.2 % 0000004689 00000 n True or False? They provide the air pressure used to operate trailer brakes. B. keep other traffic out of your side space Which of the following is true about loading cargo into double or triple trailers? These dollies will have a yellow lamp on the left side of the dolly Questions You Should Know For Doubles And Triples 1. Some vehicles have dead end or dummy couplers to which the hoses may be attached when they are not in use. cQ 220rd8bihuM#Om>G*Lz)g^\l9'A9/omf|b49U[@%jGT-QR6i. 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! 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. 11 You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. You should be sure the converter dolly air tank drain valves are _______ & the pintle hook is __________. Safety fail-safe features of a tractor-trailer converter dolly. The road is dry and visibility is good. The rear trailer of a triple Air escape from the open valve You are driving with double trailers and must use your brakes to avoid a crash. How many different ways of coupling and uncoupling trailer combinations are there? 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 _____. Those that do not have spring brakes have emergency brakes that work from the air stored in the trailer air tank. 2003-2023 Chegg Inc. All rights reserved. air throughout the system. Closed, latched What's a converter dolly? Converter dolly air tank drain valve: CLOSED. 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. A. release the spring brakes and check for movement your vehicle is so long that you must swing wide to make a turn. Only trailers designed to be pulled with another trailer behind it will have a shut off valve. The total number of questions. The converter dolly air tank drain valve on coupled double/triple trailers should be: Answer: Closed. How do you check to make sure trailer height is correct before coupling? If the spring brakes do not release when you push the trailer air supply control, check the air line connections. The driver will be required to complete this requirement in three eight hour shifts. What is likely to happen? D How can you test that air flows to all trailers? That there is some space between the upper and lower fifth wheel. you are visually checking the coupling of a converter dolly to the rear trailer. The DMV doubles triples practice test will examine your knowledge of pulling double/triple trailers, coupling and uncoupling, inspecting doubles and triples, and checking air brakes. You should look into the back of the fifth wheel on a dolly to see if it is locked onto the kingpin, A safe speed on a curve for a straight truck or a single trailer combination vehicle may be too fast for double or triple trailers. The number and size of air tanks varies among vehicles. Never unlock the pintle hook with the dolly still under the rear trailer. the fifth wheel, so trailer is raised slightly when dolly is pushed under it. The couplers have a rubber seal that prevents air from escaping. This has the same value as the %%WRONG_ANSWERS%% Variable on the Final Screen. Email Updates When New Articles Are Posted. 0000005345 00000 n To do this without wheel chocks you should: Empty trucks: When parking your double or triple combination, you should look for a parking space Learn more and apply here: TruckingTruth was founded by Brett Aquila (that's me! You are driving a 100 ft twin trailer combination at 50 mph. If there is When connecting the glad hands, press the two seals together with the couplers at a 90-degree angle to each other. Locking jaws closed on While inspecting your converter dolly coupling, you should make sure there is _____ between the upper and lower fifth wheel. Once you have coupled your rear trailer, you should test the coupling by? The pintle hook should always be secure when the vehicle is in motion. When driving with more than one trailer, which trailer should be the first one behind the tractor? 9 A 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. 0000001956 00000 n When connecting two trailers the converter dolly is connected to the rear trailer first. The trailer brakes will unlock 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. Any time you have to All material on this website is copyrighted. A This means. Sketch the shape of the passage between sections 1 and 2. Doubles and triples must be driven very smoothly to avoid rollover or jackknife. On double and triple combinations, you must make sure that which of these is secure? The Verge logo. Close the emergency line shut-off valve at the rear of the trailer. A. always keep your vehicle to the right side of your lane you should keep atleast __seconds of space ahead of you. This is CDL Doubles and Triples Test 3in our original Classic Mode. ), a 15 year truck driving veteran, in January 2007. For emergency braking you should: May have poor traction due to bouncing and wheels lockup. Take this same test in our other testing modes How to Get a Hazardous Materials Endorsement, What is a CDL? A Connect Converter Dolly to Rear Trailer Make sure trailer brakes are locked and/or wheels chocked. The pintle hook? Please use the form below to contact our customer service or sales team. This has the same value as the %%TIME_USED%% Variable on the Final Screen. A. for coupled doubles and triples, be sure that the pintle hook is in the open position The trailer height is right when: The trailer will be raised slightly when the converter dolly is backed under it. You will speak with recruiters today. Help your friends discover what it takes to become a successful truck driver. 7. Pull gently against the pin of the second trailer. Take special care when pulling two and three trailers. 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. These valves permit closing the air lines off when another trailer is not being towed. Otherwise, the dolly tow bar may fly up, possibly causing injury and making it very difficult to re-couple. Push the brake pedal as hard as you can and hold it there A. completely open mTouch Quiz will automatically populate the fields below. If one air system is very low on pressure _______. What value of channel width must the design use? Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? B. the emergency line valve open and release air 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. Closed, free, 8. When driving a double or triple trailer, greater care must be given to. If not, there is a problem. Which of the following must be connected when coupling tractor to trailer or trailer to trailer? You are driving with double trailers and must use your brakes to avoid a crash. Air pressure is sent from the air tanks to the brakes by relay valves. If this activity does not load, try refreshing your browser. Clean the couplers and rubber seals before a connection is made. inspection of all equipment. Charge the system and pump the brakes with the window down. C. closed, You can release the dolly brakes by: When uncoupling a rear trailer, your rig should be parked in a straight line on? The service air line is only used to control the service brakes (when you press on the brake pedal or use the trailer hand-valve). The emergency line valve open and release air The dolly tow bar may flip up causing bodily injury and making it very difficult to King pin. Pintle-eye of dolly in place in pintle hook of trailer (s). If loading fails, click here to try again. There is no obligation whatsoever. Converter dollies have spring brakes. Leave the emergency line shut-off valve closed and open the service line valve. For emergency braking you should: You are doing a walk around inspection of a double or triple trailer rig. If this lamp is illuminated and does not go out, Park the rear trailer against another trailer, chock the tires and lock the trailer Open the emergency line shut-off valve at the rear of the last trailer. 9 Questions You Must Ask, Decide if Truck Driving is The Correct Career Path, Do Not Sell or Share My Personal Information. With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. Any vehicle required by federal regulations to be placarded while transporting hazardous materials. True! A thorough pre-trip inspection should catch any major service line leaks before you begin your trip. 1/32 to 3/32 of an inch. Their drawbars differentiate them. Some large trucks have curved (convex or spot) mirrors. The coupling between a rear trailer and a dolly should have a space between the upper and lower fifth wheels of? How do you know if your converter dolly is equipped with antilock brakes? How do you check to make sure trailer height is correct before coupling? There is a school zone ahead. The dolly tow bar may fly away, possibly causing panic, and making it very difficult If you're only pulling one trailer, the shut off valves should always be closed or else the air will simply escape out the back of the trailer. How can you test that air flows to all trailers? C A safe speed on a curve for a straight truck or a single trailer combination vehicle may be too fast for a set of doubles or triples. retrovirus $_____________________________$. Any trailer with a reduced ground clearance If the dolly is a two axle unit then 1 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. Should the shut-off valves on the trailers be open or closed on a set of double trailers? 0000003998 00000 n A CDL is required to drive any of the following vehicles: A vehicle with two separate parts - the power unit (tractor) and the trailer. If your tanks have automatic drains, they will keep most moisture out, but you should still open the drains to make sure. 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. Take special care when pulling two and three trailers. 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? How much space should be between the upper and lower fifth wheels? What does the Driver's manual say about how much space you should keep ahead of your truck? The road is dry and the visibility is good. 2. On the middle trailer of a set of triples? Why should you not use the trailer hand valve while driving? B. restore traction to the tires When you do this, you should hear: Locking jaws closed on 12, 3. 3. Double and triple trailers increase not only the operators risk of safety, but also the other motorists around him. B The tanks will hold enough air to allow the brakes to be used several times even if the compressor stops working. 0000001107 00000 n A Open, latched B Open, free C Closed, latched D Closed, free 28. If a converter dolly is still under the second trailer and you unlock the pintle hook, what will probably happen? Slow to the safe speed before entering, then accelerate slightly through the curve. Never, 9. Calculate the voltage gain of each. You wish to turn right from one two-lane, two-way street to another. You should avoid traveling next to others when possible. To prevent trailers from rolling over, you must steer gently and go slowly around corners, on ramps, off ramps and curves. Doubles and triples are more likely to turn over than other combination vehicles because of what effect? The DMV doubles triples practice test will examine your knowledge of pulling double/triple trailers, coupling and uncoupling, inspecting doubles and triples, and checking air brakes.

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