Which of the following will occur? C Take this same test in our other testing modes How to Get a Hazardous Materials Endorsement, What is a CDL? Speed for other vehicles is often too fast for a multi-combination unit! 0000008915 00000 n A Only trailers designed to be pulled with another trailer behind it will have a shut off valve. How much space should be between the upper and lower fifth wheel? Do converter dollies have spring brakes? recouple. Connect Converter Dolly to Front Trailer Back first semitrailer into position in front of dolly tongue. 3. you are driving a set of doubles and a set of trailer wheels goes in a skid. [California Commercial Driver Handbook] The weight of a truck: Is a major factor affecting stopping distance. These valves permit closing the air lines off when another trailer is not being towed. If you do, the brakes may not work correctly. To do this without wheel chocks you should: Empty trucks: When parking your double or triple combination, you should look for a parking space Hit the article to see the way to back up your trailer like a pro! Never unlock the pintle hook with the dolly still under the rear trailer. If loading fails, click here to try again. A Open, latched B Open, free C Closed, latched D Closed, free 28. When driving a double or triple trailer, greater care must be given to. to re-capture it. D 0000006383 00000 n 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. 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. Which of these is NOT a good thing to do when driving on slippery roads? 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. On the middle trailer of a set of triples? You are driving with double trailers and must use your brakes to avoid a crash. A dolly has lights, air tanks, air relays, air lines, air brakes, ABS, electrical connections, etc. 11 During normal operation the brakes of the double/triple trailer are controlled by: You should be sure the converter dolly air tank drain . 3. Stop the vehicle by gearing down and sparingly B. slow to a safe speed before entering the curve, then accelerate slightly through it Simply click in your answer to each CDL practice test question. B. restore traction to the tires A. use the engine brake or speed retarder Doubles and triples must be driven very smoothly to avoid rollover or jackknife. Visually check to make sure that the rear trailer is slightly lower than the center of the When connecting a converter dolly to a rear trailer, the trailer height must be adjusted so that it is? coupled to the rear of a tractor-trailer combination forming a double bottom rig, A coupling device of one or two axles and a sixth wheel by which a semitrailer can be converting it into two trailers, A coupling device of three or four axles and a fifth wheel by which a semitrailer can You should be sure the converter dolly air tank drain valves are _______ & the pintle hook is __________. 11 Email Updates When New Articles Are Posted. 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! 3. If you do, there is a problem. C. closed, You can release the dolly brakes by: When checking the fifth wheel, you should make sure that it has enough? Should the shut-off valves on the rear of the last trailer be open or closed? How can you test that air flows to all trailers? 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 road is dry & visibility is good. B. keep other traffic out of your side space Try our free CDL Doubles and Triples Test Question and Answers Quiz online. How can you test that air flows to all trailers? In order to receive your Doubles and Triples endorsement, it is required that you pass the states official CDL written Knowledge exam. You should keep at least ____ seconds of space ahead of you. axle will have spring brakes due to the weight of the unit. You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. Good speed management says you should: You must drive through deep or flowing water. Allow much more space than is needed for ideal driving condition. Sometimes, metal tags are attached to the lines with the words service and emergency stamped on them. 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 Which of these statements about managing space to the sides is true? 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. paramount to safe driving. Any combination of vehicles with a gross combined weight rating (GCWR) of 26,001 or more pounds, providing the gross vehicle weight rating (GVWR) of the vehicle being towed is in excess of 10,000 pounds. re-couple, You can if you want to, it does not matter. 2) the second test is to go out to the trailer to ensure that the parking brakes have indeed applied. There are more things that can go wrong, and doubles/triples are less stable than other commercial vehicles. All of the above, 6. These mirrors: to do this without wheel chocks you should: supply air to the trailer air system with the tractor and then disconnect the emergency line. A bent or damaged kingpin on a coupling should be? C. posted speed limits on curves are safe for all trucks, Empty trucks: 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. Never, 9. 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. Explore now! Make sure pintle hook is latched. You should reduce your speed by about _____ on a wet road. C. slow to a safe speed before entering the curve, then coast through it, Which of these is NOT a good thing to do when driving on slippery roads? How do you check to make sure trailer height is correct before coupling? Question 4. Locking jaws closed on Therefore, it is very important for safety that you use wheel chocks when you park trailers without spring brakes. b. cell Once you have coupled your rear trailer, you should test the coupling by? Converter dolly air tank drain valve: CLOSED Air lines supported and glad hands properly connected. 0000010306 00000 n Make a sketch that explains this phenomenon in terms of a feedback loop . The last trailer in a combination is most likely to turn over. You should be sure the converter dolly air tank . A thorough pre-trip inspection should catch any major service line leaks before you begin your trip. You must steer gently when pulling trailers. Double and triple trailers increase not only the operators risk of safety, but also the other motorists around him. All other trailer air functions use the emergency line. View the price and details of this FINSBURY PUMP SYSTEMS 400L (SINGLE STAGE) 5.5HP HONDA GX PETROL ENGINE (18M HOSE) FIRE WATER TANK | Mobile fire units. None of the above, 5. If this lamp is illuminated and does not go out, On the first trailer in a set of doubles? Slow to a safe speed before entering the curve, then coast through the curve. you want to hook your combination to a second trailer that has no spring brakes. symptoms of a bad fuel tank selector switch. Any vehicle required by federal regulations to be placarded while transporting hazardous materials. you are driving a 100ft truck eith double trailers at 50mph. Never pull any trailer without visually inspecting the fifth wheel locking bar Some large trucks have curved (convex or spot) mirrors. The rear trailers shut off valves should be closed and the front open to allow air to the 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. You should keep at least ____ seconds of space ahead of you. You should hear air escaping, showing the entire system is charged. 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: Calculate the net energy change in kilojoules per mole that takes place on formation of MgF2_22(s) from the elements: Heat of sublimation for Mg(s) = 147.7 kJ/mol Eea_{ea}ea for F(g) = -328 kJ>mol, Bond dissociation energy for F2_22(g) = 158 kJ>mol Ei1_{i1}i1 for Mg(g) = 737.7 kJ>mol, Electrostatic interactions in MgF2_22(s) = -2957 kJ/mol Ei2_{i2}i2 for Mg(g) = 1450.7 kJ/mol. Pull gently against the pin of the second trailer. 0000007032 00000 n A. countersteer The total number of questions. 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. What is a converter dolly? 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: The dolly tow bar may fly up 9 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. Locking jaws open At section 2 downstream, the speed is 519 m/s. A Definition. 0000001107 00000 n Mar 2 - Mar 3. They are not only longer, but also need more space because they cannot be turned or stopped suddenly. Which the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the trailer. 5. D Doubles and triples must be driven very smoothly to avoid rollover or jackknife. A converter dolly is still under the second trailer when you unlock the pintle hook. C Trucks with trailers have a dangerous crack-the-whip effect. Doubles and triples are more likely to turn over than other combination vehicles because of the "crack- the-whip" effect. Refers to pulling two trailers at the same time, otherwise known as "pups" or "pup trailers" because they're only about 28 feet long. 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. A Commercial Drivers License Overview, Trucking Terminology and Transportation Definitions. If you want to couple a second trailer to your combination vehicle, secure it by using: The crack-the-whip effect that troubles trucks with trailers is most likely to cause a tip over: You are driving on a slippery road during the day. This will let the rear wheels roll again and keep the rear wheels from sliding. The road is dry and visibility is good. Once you are finished, click the button below. B. open; latched Time allowed (Requires timer add on). By clicking on "Sign Up", you agree to our Terms of Use and Privacy Policy. On double and triple combinations, you must make sure that which of these is secure? B. slightly raised the trailer height is right when: the trailer will be raised slightly when the converter dolly is backed under it. Your vehicle is so long that you must swing wide to make the turn. You are driving a tractor with multiple trailers. You are driving with double trailers and must use your brakes to avoid a crash. This will prevent water and dirt from getting into the coupler and the air lines. You should NOT: They provide the air pressure used to operate trailer brakes. can and will get stuck on a raised railroad crossing. These mirrors: Make things seem smaller and further away than they really are. New! To check if the converter dolly is securely coupled to the rear trailer you should: Pull gently against the pin of the second trailer. A turn of the glad hand attached to the hose will join and lock the couplers. 21 0 obj << /Linearized 1 /O 23 /H [ 1162 213 ] /L 29759 /E 11109 /N 7 /T 29221 >> endobj xref 21 38 0000000016 00000 n When turning a double or triple at an intersection, the turn often cannot be completed without swinging wide. locked . You should keep at least ___ seconds of space ahead of you. The lighter trailer should be in the rear. 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. then there is a problem with the ABS system. C. foot pedal, Which of these statements about managing space to the sides is true? Converter dolly air tank drain valve: CLOSED. Question 3 Explanation: All of the above. While it is general practice to make blue the service line, red the emergency line, and green the electrical line, these colors are not required by any laws or regulations. you should check the trailer height before connecting a converter dolly to a second or third trailer. A. always keep your vehicle to the right side of your lane If there are no dummy couplers, the glad hands can sometimes be locked together (depending on the couplings). 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. Time limit varies by state. You wish to turn right from one two-lane, two-way street to another. 0000001162 00000 n You will speak with recruiters today. Tips for Backing Up a Trailer Like a Pro Trucker. You need to be aware of how parking lots are arranged in order to avoid a long and difficult escape. A sudden movement with the steering wheel can result in a tipping over rear trailer. In bad weather, slippery conditions and mountain driving, you must be especially careful if you drive double and triple bottoms. C When connecting two trailers the converter dolly is connected to the rear trailer first. If there is a trailer weather passes. HK Extended Tank Drain Assembly Kit with 10 Inch Braided Steel Hose 1/4 Inch Drain Valve and Elbow Fitting for Air Compressor 4.7 (463) $1499 FREE delivery Thu, Mar 9 on $25 of items shipped by Amazon Small Business All Tool Depot Air Compressor Drain Valve Replacement for Craftsman Petcock 072-0001, 072-0006 (1-Pack) 4.2 (20) $649 A how can you be sure you supplied air to a second trailer? The road is dry and the visibility is good. Usually need a glad hand converter B. you should avoid traveling next to others whenever possible Study section 6.2 if you can't answer all of these questions. You want to lock your combination to a second trailer that has no spring brakes. Calculate the voltage gain of each. you should keep atleast __seconds of space ahead of you. That split second that you release the brakes will allow them to match the vehicles road How much space should be between the upper and lower fifth wheels? How should you test the coupling? Chock the tires, park on level ground and charge the trailer air tank if it does air throughout the system. A. fully lowered Which trailer should come first behind the tractor? This has the same value as the %%WRONG_ANSWERS%% Variable on the Final Screen. Because of this, which of the following vehicle parts is most likely to tip over? If your tanks have automatic drains, they will keep most moisture out, but you should still open the drains to make sure. D The emergency line valve open and release air True! Use controlled or stab braking Any time you have to These trailers have no parking brake. Page 7-6 Commercial Driver's Manual/2.0 = Be sure air lines are supported and glad hands are properly connected. 6. unsafe slow down even further, or better yet, find a safe haven and park until the If the fifth wheel on a coupling is too far forward, the tractor frame may hit? For emergency braking you should: C. closed; unlatched, Which of these will result in the best control on a curve? 1/32 to 3/32 of an inch. Remember however, that is just a suggestion. When driving with more than one trailer, which trailer should be the first one behind the tractor? During normal operation the brakes of the double/triple trailer are controlled by: You are driving at night and you must dim your headlights for traffic. You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. When connecting the glad hands, press the two seals together with the couplers at a 90-degree angle to each other. The road is dry and visibility is good. B Each trailer and converter dolly has one or more air tanks. Open the emergency line shut-off valve at the rear of the last trailer. and ensuring it is secure. 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. "Glad hands" are coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer. Open the shut-off valves at the rear of the last trailer and listen for air flow. You are driving a 100 ft twin trailer combination at 50 mph. B. use only the trailer brakes 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. door. There is more chance for skids and loss of traction. Any trailer with a reduced ground clearance Park on level ground, put chock on the tires, and charge the air tank. front of the second trailer. How To Use Cruise Control Effectively As A Truck Driver. You must treat a flashing red signal as you would treat a STOP sign. Open Doubles and triples are extremely prone to control issues and must be A converter dolly is If a converter dolly has spring brakes, you release the brakes by You have connected the converter dolly to the front semitrailer and then connected the rear semitrailer to the converter dolly.
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