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. A. for coupled doubles and triples, be sure that the pintle hook is in the open position With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. Some do. The last trailer in a combination is most likely to turn over. how can you be sure you supplied air to a second trailer? With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. Time allowed (Requires timer add 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. C 27. Those that do not have spring brakes have emergency brakes that work from the air stored in the trailer air tank. The braking systems of double and triple trailers are different than those of straight trucks because doubles and triples. 0000001354 00000 n Pintle hook latched. mTouch Quiz will automatically populate the fields below. When testing trailer service brakes, you should use? 0000003261 00000 n HlTo xGf`{iIMh-x||?pbE':X4ZZZRbu7 uvi_RHUkVXBVu{^B3 4e/iw\]RE] YY7i)e V*h(++WQ-]Xm9c5yU6BS" 5HiL,[b)ee:t/ )%BVGpU7T\ZJD Air will not be available to release the trailer spring brakes (parking brakes). dress gifs. B. you can almost always stop more quickly than you can turn 0000009556 00000 n You should be sure the converter dolly air tank drain valves are _____ and the pintle hook is _____. Please use the form below to contact our customer service or sales team. B. releasing the pintle hook Slow to a safe speed before entering the curve, then coast through the curve. When uncoupling a rear trailer, your rig should be parked in a straight line on? CDL Doubles and Triples Test Question and Answers 2023 [PDF]: Commercial Drivers License Doubles and Triples Endorsements Knowledge Test. That there is no space between upper and lower fifth wheel. A. opening the air tank petcock your vehicle is so long that you must swing wide to make a turn. When the road is slippery You should hear air escaping, showing the entire system is charged. Never unlock the pintle hook with the dolly still under the rear trailer. If loading fails, click here to try again. You can test that air is flowing to all trailers by opening? Always test the trailer brakes before driving with the hand valve or by pulling the air supply (tractor protection valve) control. Simply click in your answer to each CDL practice test question. good speed management says you should, may have poor traction due to bouncing and wheel lock up. Safety should never take second place, so know your stuff! 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: You are driving with double trailers and must use your brakes to avoid a crash. Locking jaws closed on If you are only pulling one trailer, make certain the valve is fully in the closed position or it will leak air out of the air system. Should the shut-off valves on the rear of the last trailer be open or closed? What is a converter dolly? 0000005664 00000 n Speed for other vehicles is often too fast for a multi-combination unit! Therefor, if there is a major leak in your service line, you may not know it until you try to use the service brake. Delivering to. rear trailer. 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). There are two types of converter dollies. To prevent trailers from rolling over, you must steer gently and go slowly around corners, on ramps, off ramps and curves. B B. are the easiest to stop since there is no shifting cargo [California Commercial Driver Handbook] The weight of a truck: Is a major factor affecting stopping distance. Air flows steadily and isentropically through a passage. When you do this, you should hear: The number of correct answers. 0000007032 00000 n 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 You are driving a 100-feet truck with double trailers at 50 mph. This has the same value as the %%SCORE%% Variable on the Final Screen. New! 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! Some vehicles have dead end or dummy couplers to which the hoses may be attached when they are not in use. Hook dolly to front trailer. Please visit using a browser with javascript enabled. Doubles and triples must be driven very smoothly to avoid rollover or jackknife. You will speak with recruiters today. When you're finished, check your score and results. Optional: Leave your email address if you would like a reply: When inspecting doubles or triples, in what position should the air shut-off valves be in? The rear trailer of a triple But the brakes will hold only as long as there is air pressure in the trailer air tank. Before you can supply air to the air tanks of a second trailer you need to. What is a converter dolly? If you do, there is a problem. The pintle hook? C. foot pedal, Which of these statements about managing space to the sides is true? securely fastened. On a triple combination, the shutoff valves at the rear off the middle trailer should be? 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. What is likely to happen? The pintle hook should always be secure when the vehicle is in motion. 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. There is no obligation whatsoever. If you leave this page, your progress will be lost. you are visually checking the coupling of a converter dolly to the rear trailer. 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: Select the answer that correctly completes each statement. A converter dolly is still under the second trailer when you unlock the pintle hook. 0000003998 00000 n re-couple, You can if you want to, it does not matter. Calculate the voltage gain of each. C. fully raised, Which of these statements about speed management and braking is true? If the converter dolly is close to your semitrailer, you should wheel it into position? Doubles and triples are more likely to turn over than other combination vehicles because of the "crack- the-whip" effect. Unless you are draining the condensation out of the air tank, then the drain valve 1/3 For example: If you are traveling 60 MPH and it begins to rain, your suggested The road is dry and visibility is good. When you're trying to correct a drive-wheel braking skid why should you stop braking? fifth wheel, so trailer is raised slightly when dolly is pushed under it. Be sure air-lines are supported and glad hands are properly connected. C Open, free That there is no space between upper and lower sixth wheel. Connect Converter Dolly to Rear Trailer Make sure trailer brakes are locked and/or wheels chocked. You need to brake in order to regain control. A. use light, steady pressure on the brake pedal D You are driving a triple trailer and there is a loss of air pressure in the emergency line. How much space should be between the upper and lower fifth wheels? You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. Either the front or the rear brakes will not work properly or fully. A 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. Calculate the Mach number at section 2. 0000002636 00000 n How can you test that air flows to all trailers? Only trailers designed to be pulled with another trailer behind it will have a shut off valve. Your vehicle is so long that you must swing wide to make the turn. There are more things that can go wrong, and doubles/triples are less stable than other commercial vehicles. D Wait for air pressure to reach normal, then push in the red trailer air supply knob. Trucks with trailers have a dangerous crack-the-whip effect. C When testing the coupling of the double trailer the landing gears of the rear trailer should be: You want to hook your combination to a second trailer that has no spring brakes. What should you check for when inspecting a converter dolly? 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 A. release the spring brakes and check for movement It depends on the load This section explains how important it is to be careful when driving with more than one trailer, how to couple and uncouple correctly, and about inspecting doubles and triples carefully. A Open, latched B Open, free C Closed, latched D Closed, free 28. B. restore traction to the tires B Any single vehicle with a GVWR of 26,001 or more pounds, or any such vehicle towing another not in excess of 10,000 pounds. These valves permit closing the air lines off when another trailer is not being towed. With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. 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. This will prevent water and dirt from getting into the coupler and the air lines. Sometimes, metal tags are attached to the lines with the words service and emergency stamped on them. Open. Unlock the pintle hook only if the trailer it is under is loaded, otherwise the dolly tow bar may fly up, possibly causing injury and making it very difficult to re-couple. What three methods can you use to secure a second trailer before coupling? Which of the following is true about loading cargo into double or triple trailers?
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