Air Storage and Drain Tanks: Air storage tanks are used to hold compressed air. 0000005345 00000 n The dolly tow bar may flip up causing bodily injury and making it very difficult to This has the same value as the %%TIME_ALLOWED%% Variable on the Final Screen. Do converter dollies have spring brakes? Please visit using a browser with javascript enabled. Hit the article to see the way to back up your trailer like a pro! C Contributor: Luke Nold (Experienced truck driver for 5+ years and published writer for Fleet Magazine). 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? What should you check for when inspecting a converter dolly? the fifth wheel, so trailer is raised slightly when dolly is pushed under it. In this order, the shutoff valves at the rear of front trailers, the rear of the last trailer and the converter dolly air tank drain valve should be? A dolly should be pulled out from a rear trailer using? For emergency braking you should: May have poor traction due to bouncing and wheels lockup. 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 Go to the rear of second trailer and open the emergency line shut-of valve. You shouldn't stop braking. What is one function of the tractor protection valve? Feel Free to add additional fields for the Quiz Taker to complete using the "Add Fields" options to the right. B. do not need to be checked as often as flat mirrors because they show a larger area To prevent trailers from rolling over, you must steer gently and go slowly around corners, on ramps, off ramps and curves. 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. You should reduce your speed by about _____ on a wet road. 1/3 For example: If you are traveling 60 MPH and it begins to rain, your suggested This means. These dollies will have a yellow lamp on the left side of the dolly. Always unlock the pintle hook with the dolly still under the rear trailer. When you do this, you should hear: If you feel Open the emergency line shut-off valve at the rear of the last trailer. There are more critical parts to check when you have two or three trailers. [California Commercial Driver Handbook] The weight of a truck: Is a major factor affecting stopping distance. dress gifs. This has the same value as the %%TIME_USED%% Variable on the Final Screen. The number of correct answers. Air escape from the open valve You are driving with double trailers and must use your brakes to avoid a crash. 2 0000003060 00000 n When you're finished, check your score and results. Locking jaws open Single axle converter dollies are the most common type of converter dolly used in the U.S. C-dolly The C-dolly has two separate couplings, side-by-side. B B The application only takes one minute. A major leak in the emergency line will cause the tractor protection valve to close and the trailer emergency brakes to come on. 0000004668 00000 n 0000003998 00000 n When you do this, you should hear: Ais escape from the open valve. Typically depends on the axle count. Air pressure is sent from the air tanks to the brakes by relay valves. That there is some space between the upper and lower fifth wheel. Safety chains should be secured to trailer(s). weather passes. A coupling device of one or two axles and a fifth wheel by which a semitrailer can be coupled to the rear of a tractor-trailer combination forming a double bottom rig Should the shut off valves on the rear of the first trailer be open or closed on a set of double trailers? The crack the whip effect will topple the rear trailer first. cQ 220rd8bihuM#Om>G*Lz)g^\l9'A9/omf|b49U[@%jGT-QR6i. 0000010285 00000 n Which of the following is true about loading cargo into double or triple trailers? %PDF-1.2 % 0000004689 00000 n In bad weather, slippery conditions and mountain driving, you must be especially careful if you drive double and triple bottoms. It is important to check the height of the trailer before connecting a converter dolly to a trailer. You can find it here: High Road 2.0. A dolly is like a very short trailer, with a ring hitch on the front and a fifth wheel on top. 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. C The converter dolly air tank drain valve on coupled double and triple trailers should be: Closed. 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. [Penalties Applying to Any DUI Conviction; Driving Under the Influence of Drugs or Alcohol (The "DUI" Law); Section B-7 Alcohol, Other Drugs and Driving; Tennessee Comprehensive Driver License Manual]. allow "much more space than is needed for ideal driving conditions". Make sure the converter dolly air tank drain valve is closed. With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. Locking jaws closed on 2. 0000006836 00000 n Remember: The trailer air brakes are supplied with air using the emergency line (also called the supply line). Then, the air loss from the leak will lower the air tank pressure quickly. If a converter dolly is still under the second trailer and you unlock the pintle hook, what will probably happen? you should check the trailer height before connecting a converter dolly to a second or third trailer. 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. locked . c. iron Wait for air pressure to reach normal, then push in the red trailer air supply knob. Doubles and triples are more likely to turn over than other combination vehicles because of the "crack-the-whip" effect. which of these statements about quick steering movements and doubles/triples is true? You are driving a 100-feet truck with double trailers at 30 mph. A 0000010306 00000 n If you crossed the air lines, you could drive away, but you would not have trailer brakes. The converter dolly air tank drain valve on coupled double/triple trailers should be: Closed. Check them all. A CDL is required to drive any of the following vehicles: A vehicle with two separate parts - the power unit (tractor) and the trailer. fifth wheel, so trailer is raised slightly when dolly is pushed under it. The lighter trailer should be in the rear. Pickup at South Loop. For emergency braking you should: re-couple, You can if you want to, it does not matter. The crack the whip effect that troubles trucks with trailers. C Remember however, that is just a suggestion. When you're trying to correct a drive-wheel braking skid why should you stop braking? However there are some states that allow doubles that are each 48 feet in length. 2. When you are pulling trailers, which of the following statements is true about steering? When connecting a converter dolly to a rear trailer, the trailer height must be adjusted so that it is? Should the shut-off valves on the trailers be open or closed on a set of double trailers? 0000003977 00000 n 8. Often do not have spring brakes the crack-whip effect that triubkes trucks with trailers is most likely to cause a tip over when. When testing trailer service brakes, you should use? B. allow one vehicle length for every 10,000 lbs of gross vehicle weight The road is dry and visibility is good. B. open; latched B. closed you are driving on a slippery road during the day. This has the same value as the %%PERCENTAGE%% Variable on the Final Screen. A This has the same value as the %%WRONG_ANSWERS%% Variable on the Final Screen. Older trailers do not have spring brakes. That there is no space between upper and lower fifth wheel. rear trailer. What is a converter dolly? Pintle hook latched. 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? then there is a problem with the ABS system. Unless you are draining the condensation out of the air tank, then the drain valve S-cam brakes are the most common style brakes on large trucks today. Becoming A Truck Driver is a dream we've all pondered at some point in our lives. On the middle trailer of a set of triples? ), a 15 year truck driving veteran, in January 2007. Release Dolly breaks by opening the air tank petcock or if the dolly has a spring break, use the Dolly parking brake control . For emergency braking you should: A Push the brake pedal as hard as you can and hold it there B Tractor-trailers are considered combination vehicles. D On a triple combination, the shutoff valves at the rear off the middle trailer should be? You are doing a walk around inspection of a double or triple trailer rig. What does the Driver's manual say about how much space you should keep ahead of your truck? If it goes low enough, the trailer emergency brakes will come on. 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. Doubles and triples must be driven very smoothly to avoid rollover or jackknife. Take special care when pulling two and three trailers. B. the emergency line valve open and release air Like a trailer, a dolly equipped with ABS will have a yellow indicator light on the left side. They provide the air pressure used to operate trailer brakes. [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." Converter dollies are connected to front trailers with a? Tips for Backing Up a Trailer Like a Pro Trucker. A. require shorter stopping distances than full ones 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? You should keep at least ____ seconds of space ahead of you. What should you check for when inspecting the converter dolly? In order to receive your Doubles and Triples endorsement, it is required that you pass the state's official CDL written Knowledge exam. In a certain electronic device, a three-stage amplifier is desired, whose overall voltage gain is 42 dB. the trailer height is right when: the trailer will be raised slightly when the converter dolly is backed under it. If there is air there, then there is air towards the cab You want to hook up to the first trailer, then the converter dolly while it is lined up in Please wait while the activity loads. When driving a truck with more than one trailer, which trailer should be first behind the truck? The lighter semitrailer should be in first position behind the tractor. Why should you use chocks when parking a trailer without spring brakes? A converter dolly is a piece of equipment designed to allow commercial trucks, such as semi-trucks, to pull a trailer. Converter dolly air tank drain valve: CLOSED Air lines supported and glad hands properly connected. If you do cross the air lines, supply air will be sent to the service line instead of going to charge the trailer air tanks. Hb```f``b`c``e@ (Q6_* 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. C The air lines will rupture To check air flows to all trailers, you should let air pressure reach normal then? Some large trucks have curved (convex or spot) mirrors. C. the service brakes slowly move to the fully applied position, Some large trucks have converted or "spot" mirrors. The trailer is at the correct height when. When you do this, you should hear: Driving doubles/triples is also more dangerous in hot and cold weather driving, as well as on mountain roads. 0000009556 00000 n 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. 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 _______. 10 C 0000002446 00000 n What do you check when making a visual check of coupling? When you do this, you should hear: you are driving with double trailer and must use your brakes to avoid a crash. 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! Any trailer with a reduced ground clearance All other trailer air functions use the emergency line. Air will not be available to release the trailer spring brakes (parking brakes). Hit the article below to see specific information about AOBRDs! Make sure trailer height is correct. Slow to the safe speed before entering, then accelerate slightly through the curve. you are driving a set of doubles and a set of trailer wheels goes in a skid. King pin. 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. With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. A connection device of one axle used to disconnect a semitrailer combination vehicle will have a lamp on the drivers side. which of these statements about managing space to the sides is true? To test the tractor protection valve, charge the trailer air brake system, turn off the engine, and Doubles and triples take up more space than other commercial vehicles. What three methods can you use to secure a second trailer before coupling? You MUST have air all the way to the back for all the brakes to work. B. johnson bar 0000001956 00000 n 0000003261 00000 n This will supply air to the emergency (supply) lines. 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? Which of the following will occur? B. pull gently against the pin of the second semitrailer A full trailer behind a truck If your tanks have automatic drains, they will keep most moisture out, but you should still open the drains to make sure. Opening the shut off valves on the rear most trailer will ensure the lines are flowing Make a sketch that explains this phenomenon in terms of a feedback loop . C. make things look larger and closer to you than they really are, When hauling triple trailers at a speed less than 40 mph, you should leave at least _____ second(s) for every ten feet of your truck between you and the vehicles ahead of you. Email Updates When New Articles Are Posted. What is a converter dolly? Use controlled or stab braking A-dolly. Ensuring the safety of the public starts with a thorough inspection of all equipment. 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. The dolly tow bar may fly away, possibly causing panic, and making it very difficult 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.