symptoms of a bad fuel tank selector switch. 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 D 0000005345 00000 n 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 Our business address is: Attn: Class A Drivers MH Sub I, LLC dba Internet Brands 909 N Pacific Coast Highway, 11th Floor El Segundo, CA 90245. When testing trailer service brakes, you should use? which of these is not a good thing to do when driving on slippery roads? What will happen if there is a major leak in the service air line? Which is most likely to tip over: We wish you the best of luck in your endeavors and are pleased to be of assistance. Some areas of concern are discussed below. How much space should be between the upper and lower fifth wheel? There are more critical parts to check when you have two or three trailers. The word part ferrit- means: When uncoupling, you should never unlock the _______ with the dolly still under the rear trailer. This will prevent water and dirt from getting into the coupler and the air lines. What types of trailers can get stuck on raised crossings? None of the above, 2. Opening the shut off valves on the rear most trailer will ensure the lines are flowing Converter dolly air tank drain valve: CLOSED. A On a triple combination, the shutoff valves at the rear off the middle trailer should be? The crack the whip effect will topple the rear trailer first. The driver will be required to complete this requirement in three eight hour shifts. This will supply air to the emergency (supply) lines. Be certain you are clear at the sides before changing lanes. They provide the air pressure used to operate trailer brakes. b. cell 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. Take this same test in our other testing modes How to Get a Hazardous Materials Endorsement, What is a CDL? Question 3 Explanation: All of the above. If it goes low enough, the trailer emergency brakes will come on. The couplers have a rubber seal that prevents air from escaping. A The rear trailer does not have shut-off valves. When you do this, you should hear: you are driving with double trailer and must use your brakes to avoid a crash. What value of channel width must the design use? C All ABS equipped units You have not finished your quiz. 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. 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 _______. Which of these statements about managing space to the sides is true? Do converter dollies have spring brakes? you should keep atleast __seconds of space ahead of you. These dollies will have a yellow lamp on the left side of the dolly Questions You Should Know For Doubles And Triples 1. Join 50,000+ users around America to get your Commercial Driver License today! 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. The last trailer in a combination is most likely to turn over. Slow to a safe speed before entering the curve, then coast through the curve. How do you check to make sure trailer height is correct before coupling? C. When coupling doubles and triples, be sure that the pintle-eye of the dolly is in place in the pintle hook of the trailer, You are driving on a slippery road during the day. When connecting two trailers the converter dolly is connected to the rear trailer first. Good speed management says you should: You must drive through deep or flowing water. Our normal business hours are Monday-Friday 8 a.m. to 5 p.m. (Pacific Time). When the road is dry A. 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. Which of the following statements about off tracking is true? 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? C The lighter semitrailer should be in first position behind the tractor. 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. Calculate the Mach number at section 2. A thorough pre-trip inspection should catch any major service line leaks before you begin your trip. Doubles and triples are more likely to turn over than other combination vehicles because of the "crack-the-whip" effect. While inspecting your converter dolly coupling, you should make sure there is _____ between the upper and lower fifth wheel. Take special care when pulling two and three trailers. Open the emergency line shut-off valve at the rear of the last trailer. You may be timed. Sketch the shape of the passage between sections 1 and 2. B 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 has lights, air tanks, air relays, air lines, air brakes, ABS, electrical connections, etc. 0000006015 00000 n you should check the trailer height before connecting a converter dolly to a second or third trailer. The road is dry and visibility is good. Lock pintle hook. What is one function of the tractor protection valve? [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]. True False True If you want to couple a second trailer to you combiantion vehicle, secure it by using the: Trailer emergency air brakes. There are more things that can go wrong, and doubles/triples are less stable than other commercial vehicles. axle will have spring brakes due to the weight of the unit. the converter dolly air tank drain valve on couple double/triple trailers should be: to check if the converter dolly is securely coupled to the rear trailer you should: pull gently against the pin of the second trailer. 0000010705 00000 n For emergency braking you should: You are doing a walk around inspection of a double or triple trailer rig. Blue is used for the service lines, and red for the emergency (supply) lines. When driving a truck with more than one trailer, which trailer should be first behind the truck? When checking the coupling system, make sure that the locking jaws are around the shank of the. 0000010285 00000 n 7.3 Inspecting Doubles and Triples = Additional Things to Check During a Walkaround Inspection. Check them all. Before coupling a trailer, you should make sure it is at the right height using? With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. You should keep at least ____ seconds of space ahead of you. What should you check for when inspecting the converter dolly and the pintle hook? 0000008894 00000 n C. close the shut-off valves at the rear of the first trailer and open the shut-off valves at the rear of the second trailer, To check that the converter dolly is securely coupled to the rear trailer, you should: Connect the Converter Dolly to the Rear Trailer: Test the coupling by pulling against the pin of the second semitrailer. The emergency line valve open and release air Air escape from the open valve Ensuring the safety of the public starts with a thorough A. brake and downshift in a curve you are doing a walkaround inspection of a double or triple trailer rig. a. blood Also, this page requires javascript. Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? Any vehicle required by federal regulations to be placarded while transporting hazardous materials. What does the drivers manual say about how much space you should keep ahead of your truck? In order to receive your Doubles and Triples endorsement, it is required that you pass the state's official CDL written Knowledge exam. You are doing a walk around inspection of a double or triple trailer rig. C A. always keep your vehicle to the right side of your lane Hit the article to see the way to back up your trailer like a pro! What is the most common foundation brake found on heavy vehicles? Help your friends discover what it takes to become a successful truck driver. You should keep at least _____ seconds of space ahead of you. Chock the tires, park on level ground and charge the trailer air tank if it does Air flows steadily and isentropically through a passage. B B. do not need to be checked as often as flat mirrors because they show a larger area how can you be sure you supplied air to a second trailer? There is no obligation whatsoever. 0000007508 00000 n paramount to safe driving. D There are two types of converter dollies. If there is Visually check to make sure that the lead trailer is slightly higher than the center of A 0000002636 00000 n "Glad hands" are coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer. 0000001375 00000 n You are visually checking the coupling of a converter dolly to the rear trailer. The rear trailer of a triple B. releasing the pintle hook 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. Open, free Pull gently against the pin of the second trailer. Open the emergency line shut-off valve at the rear of the last trailer. 1/4 in. The pressure in the service line tells how much pressure the relay valves should send to the trailer brakes. 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. The rear trailers shut-off valves should be open and the front closed. 2003-2023 Chegg Inc. All rights reserved. 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. D Ideal for replacing a worn, leaky drain valve on a compressor. 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. A converter dolly is still under the second trailer when you unlock the pintle hook. Explore now! This has the same value as the %%WRONG_ANSWERS%% Variable on the Final Screen. We have a new version of this program. A. open the shut-off valves at the rear of both trailers 0000005733 00000 n Which is most likely to tip over: which of these statements about managing space to the sides is true? 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? Any time you have to Seriously! CDL Doubles and Triples Test Question and Answers 2023 [PDF]: Commercial Drivers License Doubles and Triples Endorsements Knowledge Test. There is a school zone ahead. Refers to pulling two trailers at the same time, otherwise known as "pups" or "pup trailers" because they're only about 28 feet long. Therefore, look far ahead so you can slow down or change lanes gradually when necessary. Use controlled or stab braking Should the shut-off valves on the trailers be open or closed on a set of double trailers? When driving with more than one trailer, which trailer should be the first one behind the tractor? 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? 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. These valves permit closing the air lines off when another trailer is not being towed. weather passes. The lighter trailer should be in the rear. 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 are doing a walk around inspection of a double or triple trailer rig. B. pull gently against the pin of the second semitrailer The trailer is at the correct height when. A CDL is required to drive any of the following vehicles: A vehicle with two separate parts - the power unit (tractor) and the trailer. Which the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the trailer. What does the Commercial Driver Handbook say about how much space you should keep ahead of your truck? They provide the air pressure used to operate trailer brakes. To prevent trailers from rolling over, you must steer gently and go slowly around corners, on ramps, off ramps and curves. You can reset the test and retake it as needed. 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. Their drawbars differentiate them. should remain in the closed position. Doubles/triples flip flop over from quick steering moves more easily than many vehicles. you are driving a 100ft truck eith double trailers at 50mph. You should NOT: Which trailer should come first behind the tractor? Number of wrong answers. The converter dolly air tank drain valve on coupled double/triple trailers should be: Closed. 2. Any items you have not completed will be marked incorrect. Why should you not use the trailer hand valve while driving? 0000006195 00000 n The shut off valves prevent air from going any further. Go to Section 4: Other Topics This question is in Section 4: Other Topics of our CDL Test Guide. Safety should never take second place, so know your stuff! Be more careful in adverse conditions. A low air buzzer will go off indicating something is wrong and either the front or the C. posted speed limits on curves are safe for all trucks, Empty trucks: If you feel The Verge logo. 3. The number of correct answers. 0000009556 00000 n 0000001582 00000 n 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. If the spring brakes do not release when you push the trailer air supply control, check the air line connections. The total number of questions. When you do this, you should hear: Ais escape from the open valve. Once you are finished, click the button below. Go to the rear of the rig. front of the second trailer. 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 Driving doubles/triples is also more dangerous in hot and cold weather driving, as well as on mountain roads. A. hand valve Should the converter dolly air-tank drain valve be open or closed on a double trailer combination? For a particular IC-fabrication process, the transconductance parameter kn=400A/V2,k_{n}^{\prime}=400 \mu \mathrm{A} / \mathrm{V}^{2},kn=400A/V2, and Vt=0.5V.V_{t}=0.5 \mathrm{V}.Vt=0.5V. However, converter dollies and trailers built before 1975 are not required to have spring brakes. A driver of a vehicle with double or triple trailers will have greater length and more dead axles to pull, increasing the likelihood of a wreck. The crack the whip effect that troubles trucks with trailers. A sudden movement with the steering wheel can result in a tipping over rear trailer. We are here to help. You should hear air escaping, showing the entire system is charged. D the road is dry & visibility is good. 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. The application only takes one minute. When uncoupling a rear trailer, your rig should be parked in a straight line on? 0000007032 00000 n A Open, latched B Open, free C Closed, latched D Closed, free 28. on kingpin. The coupling between a rear trailer and a dolly should have a space between the upper and lower fifth wheels of? Contributor: Luke Nold (Experienced truck driver for 5+ years and published writer for Fleet Magazine). The puzzle: At the far left edge, the plates are in contact, so the path length difference between rays 222 and 333 is zero. If the converter dolly is close to your semitrailer, you should wheel it into position? Disconnect the glad-hand at the front of the first trailer and listen for air flow. you are driving at night and you must dim your headlights for traffic. Make sure pintle hook is latched. 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. Because of this, which of the following vehicle parts is most likely to tip over? Which of these statements about quick steering movements and doubles/triples is true? The front trailer in a set of double trailers is most likely to turn over due to the Crack-the-Whip effect. The dolly tow bar may fly away, possibly causing panic, and making it very difficult Many scientists are concerned that the melting of Earth's sea ice will increase Earth's surface temperature. The road is dry and visibility is good. You may not notice a major leak in the service line until you try to put the brakes on. 2) the second test is to go out to the trailer to ensure that the parking brakes have indeed applied. You should keep at least ____ seconds of space ahead of you. to do this without wheel chocks you should: supply air to the trailer air system with the tractor and then disconnect the emergency line. Doubles and triples are more likely to turn over than other combination vehicles because of the "crack- the-whip" effect. 1. If this activity does not load, try refreshing your browser. Nothing, the weight of the trailer will keep it in place, 10. When driving doubles or triples how should they be driven to avoid rollover or jackknifing: For all brakes to work on a triple combination, you must have air supply? Watch the wording of the question AND the answers A safe driver will look for all of the above. You should reduce your speed by about _____ on a wet road. Pull gently against the pin of the second trailer. Try our free CDL Doubles and Triples Test Question and Answers Quiz online. Otherwise, the dolly tow bar may fly up, possibly causing injury and making it very difficult to re-couple. The rear trailers shut-off valves should be closed and the front open. B. keep gentle pressure on the brakes while going through the water and for a short distance after coming out Which of the following will probably happen if you are driving a double rig and a set of trailer wheels goes into a skid? kingpin, That there is grease between upper and lower fifth wheel. Doubles and triples are more likely to turn over than other combination vehicles because of what effect? You need to brake in order to regain control. When you're finished, check your score and results. A. release the spring brakes and check for movement Hook dolly to front trailer. retrovirus $_____________________________$. Compressed air usually has some water and some compressor oil in it. 12, 3. Page 7-6 Commercial Driver's Manual/2.0 = Be sure air lines are supported and glad hands are properly connected. Which of these are the correct positions for shut-off valves in doubles and triples? At section 2 downstream, the speed is 519 m/s. D Push the brake pedal as hard as you can and hold it there You are driving with double trailers and must use your brakes to avoid a crash. Each trailer and converter dolly has one or more air tanks. True or False? The road is dry and visibility is good. 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 Eventually, the air will leak away, and then there will be no brakes. 0000009577 00000 n Why should you use chocks when parking a trailer without spring 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." recouple. 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. High Road 2.0! You are driving a 100-feet truck with double trailers at 30 mph. 7. 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 a turn. What happens if you cross the Emergency Air Line and the Service Air Line? %PDF-1.2 % To do this without wheel chocks you should: Empty trucks: When parking your double or triple combination, you should look for a parking space A . You will speak with recruiters today. You should hear air escaping, showing the entire system is charged. Correct answer percentage. How can you be sure you supplied air to a second trailer? 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. The emergency brakes come on whenever air pressure in the emergency line is lost. You are visually checking the coupling of a converter dolly to the rear trailer. New! Any trailer with a reduced ground clearance kingpin. "Glad hands" are coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer. Remember, the service line is not used unless you depress the brake pedal or use the trailer hand valve. 0000008915 00000 n X D5^4aX{Ka)nT)Ac g" endstream endobj 58 0 obj 108 endobj 23 0 obj << /Type /Page /Parent 19 0 R /Resources 24 0 R /Contents [ 31 0 R 33 0 R 35 0 R 46 0 R 48 0 R 50 0 R 52 0 R 54 0 R ] /MediaBox [ 0 0 612 792 ] /CropBox [ 0 0 612 792 ] /Rotate 0 >> endobj 24 0 obj << /ProcSet [ /PDF /Text ] /Font << /F2 37 0 R /F4 40 0 R /TT2 28 0 R /TT4 26 0 R /TT6 42 0 R /TT8 44 0 R >> /ExtGState << /GS1 55 0 R >> /ColorSpace << /Cs5 29 0 R >> >> endobj 25 0 obj << /Type /FontDescriptor /Ascent 905 /CapHeight 0 /Descent -211 /Flags 32 /FontBBox [ -222 -325 1072 1037 ] /FontName /ArialMT /ItalicAngle 0 /StemV 0 >> endobj 26 0 obj << /Type /Font /Subtype /TrueType /FirstChar 32 /LastChar 121 /Widths [ 278 0 355 0 0 0 0 191 333 333 0 0 278 333 278 278 556 556 556 556 556 556 556 556 556 556 278 0 0 0 0 556 0 667 667 722 722 667 611 778 722 278 0 667 556 833 722 778 667 0 722 667 611 722 0 944 0 667 0 0 0 0 0 0 0 556 556 500 556 556 278 556 556 222 222 500 222 833 556 556 556 556 333 500 278 556 500 722 500 500 ] /Encoding /WinAnsiEncoding /BaseFont /ArialMT /FontDescriptor 25 0 R >> endobj 27 0 obj << /Type /FontDescriptor /Ascent 905 /CapHeight 0 /Descent -211 /Flags 96 /FontBBox [ -262 -325 1082 1025 ] /FontName /Arial-ItalicMT /ItalicAngle -15 /StemV 0 >> endobj 28 0 obj << /Type /Font /Subtype /TrueType /FirstChar 32 /LastChar 118 /Widths [ 278 0 0 0 0 0 0 191 0 0 0 0 0 333 278 278 556 556 556 556 556 556 556 556 0 0 0 0 0 0 0 0 0 0 0 722 722 0 0 0 0 0 0 0 0 833 0 0 667 0 0 0 611 0 0 0 0 0 0 0 0 0 0 0 0 556 556 500 556 556 0 556 0 222 0 0 222 833 556 556 556 0 333 500 0 556 500 ] /Encoding /WinAnsiEncoding /BaseFont /Arial-ItalicMT /FontDescriptor 27 0 R >> endobj 29 0 obj [ /CalRGB << /WhitePoint [ 0.9505 1 1.089 ] /Gamma [ 2.22221 2.22221 2.22221 ] /Matrix [ 0.4124 0.2126 0.0193 0.3576 0.71519 0.1192 0.1805 0.0722 0.9505 ] >> ] endobj 30 0 obj 638 endobj 31 0 obj << /Filter /FlateDecode /Length 30 0 R >> stream It is important to check the height of the trailer before connecting a converter dolly to a trailer. D Any vehicle, regardless of size, designed to transport 16 or more persons, including the driver. 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. You can test that air is flowing to all trailers by opening? B. closed A. for coupled doubles and triples, be sure that the pintle hook is in the open position That split second that you release the brakes will allow them to match the vehicles road Also available in App Store & Google Play. If one air system is very low on pressure _______. 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. 5. C 5. B If there is a trailer For emergency braking you should: May have poor traction due to bouncing and wheels lockup. You can find it here: High Road 2.0. Converter dolly air tank drain valve: CLOSED. Hazardous materials must be placarded on all four sides of EACH Trailer. You are driving a tractor with multiple trailers. You shouldn't stop braking. None Air pressure is sent from the air tanks to the brakes by relay valves. A then there is a problem with the ABS system. coupled to the rear of a tractor-trailer combination forming a double bottom rig, Careful of the wording! 0000001956 00000 n To help, some companies offer their drivers per diem to get them started Read More, Driving a semi-truck for a living is unlike any other profession. 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. Your tractor protection valve control should pop out, or go from normal to emergency position, when air pressure falls into what range? with the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the trailer. B. slightly raised and possible answers include: open, free or closed, latched or closed, free or open, latched from TruckersDouble & Triple Trailer (CDL) Endorsement. Converter dollies have spring brakes. Terms in this set (43) Converter dollies are used to connect: A tractor-trailer combination to another trailer. How do you check to make sure trailer height is correct before coupling? Submit your email at the end of the test. Use only the trailer brakes When you go to the rear of the last trailer, what should you do to complete this check? Safety chains secured to trailer (s). doubles/triples flip flop over from quick steering movements more easily than many other vehicles. Park on level ground, put chock on the tires, and charge the air tank. A. closed; latched air throughout the system. B. restore traction to the tires On the middle trailer of a set of triples? Seriously! Charge the system and pump the brakes with the window down. These dollies will have a yellow lamp on the left side of the dolly.
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the converter dolly air tank drain valve should be
