. air throughout the system. 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. It is important not to let water and oil build up in the air tanks. C You should hear air escaping, showing the entire system is charged. how can you be sure you supplied air to a second trailer? We are here to help. 10 mTouch Quiz will automatically populate the fields below. locked . You are doing a walk around inspection of a double or triple trailer rig. 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. 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. Which of the following must be connected when coupling tractor to trailer or trailer to trailer? 0000003977 00000 n A. closed; latched B. the emergency line valve open and release air 3. There is no obligation whatsoever. You are doing a walk around inspection of a double or triple trailer rig. When driving a truck with more than one trailer, which trailer should be first behind the truck? C Often do not have spring brakes Double and Triples Endorsement Flashcards If a converter dolly is still under the second trailer and you unlock the pintle hook, what will probably happen? Make sure you do not get in a spot you cannot pull straight through. Doubles and triples take up more space than other commercial vehicles. Open the emergency line shut-off valve at the rear of the last trailer. These mirrors: make things seem smaller & further away then they really are. The puzzle: At the far left edge, the plates are in contact, so the path length difference between rays 222 and 333 is zero. A major leak in the emergency line will cause the tractor protection valve to close and the trailer emergency brakes to come on. Open, free The dolly tow bar may fly away, possibly causing panic, and making it very difficult 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? PDF Doubles and triples 1. The stopping distance for a tractor trailer 0000001162 00000 n 0000010705 00000 n Older trailers do not have spring brakes. All rights reserved Site Map. You should hear air escaping, showing the entire system is charged. New! Please use the form below to contact our customer service or sales team. Wait for air pressure to reach normal, then push in the red trailer air supply knob. All rights reserved 2022 TestPermit.com, CDL Doubles and Triples Test Question and Answers, Divided Highway Sign: Meaning, Quiz Definition, Example, Shape, Location, Color, Narrow Bridge Sign: Meaning, Quiz Definition, Example, Shape, Location, Color, STOP Sign 2023 Meaning, Quiz Definition, Example, Shape, Location, Color, Crossbuck Sign: Meaning, Definition, Example, Shape, Location, Color, Georgia CDL Permit Practice Test 2023 Study Guide [PDF], Georgia Motorcycle Permit Test 2023 with Study Guide [PDF], Georgia Permit Test 2023 (DDS Practice Test UPDATED), Georgia ADAP Practice Test 2023 Questions Answers Online, Ohio CDL Permit Practice Test 2023 Study Guide [PDF], Ohio Motorcycle Permit Test 2023 Study Guide [PDF]. you should avoid traveling next to others when possible. 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. 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. The converter dolly air tank drain valve on coupled double/triple trailers should be: Closed. Eventually, the air will leak away, and then there will be no brakes. Be sure air-lines are supported and glad hands are properly connected. Inspecting Doubles And Triples | High Road Online CDL Training Like a trailer, a dolly equipped with ABS will have a yellow indicator light on the left side. They are not only longer, but also need more space because they cannot be turned or stopped suddenly. B. slow to a safe speed before entering the curve, then accelerate slightly through it On the first trailer in a set of doubles? You are driving a 100-feet truck with double trailers at 30 mph. The road is dry and visibility is good. Be more careful in adverse conditions. The rear trailers shut off valves should be closed and the front open to allow air to the Sometimes, metal tags are attached to the lines with the words service and emergency stamped on them. To do this without wheels chocks you should: Supply air to the trailer air system with the tractor and then disconnect the emergency line. Always test the trailer brakes before driving with the hand valve or by pulling the air supply (tractor protection valve) control. This will prevent water and dirt from getting into the coupler and the air lines. Mar 2 - Mar 3. C Converter dolly air tank drain valve: CLOSED Air lines supported and glad hands properly connected. These dollies will have a yellow lamp on the left side of the dolly Questions You Should Know For Doubles And Triples 1. Make sure trailer height is correct. There are more things that can go wrong, and doubles/triples are less stable than other commercial vehicles. At TruckingTruth we'll help you decide if trucking is right for you and help you get your career off to a great start. 4. To help avoid mistakes, colors are sometimes used. There is a school zone ahead. rear trailer. on kingpin. [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." You should keep at least ____ seconds of space ahead of you. You have not finished your quiz. C On double and triple combinations, you must make sure that which of these is secure? 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. 0000002636 00000 n A good and safe driver will always look out for ______. If your tractor protection valve doesn't work properly, then if an air hose starts to leak what could happen? HlTo xGf`{iIMh-x||?pbE':X4ZZZRbu7 uvi_RHUkVXBVu{^B3 4e/iw\]RE] YY7i)e V*h(++WQ-]Xm9c5yU6BS" 5HiL,[b)ee:t/ )%BVGpU7T\ZJD The dolly tow bar may fly up, possibly causing injury, and making it very difficult to The air lines will rupture You are driving a tractor with multiple trailers. Because of this, which of the following vehicle parts is most likely to tip over? B. for doubles and triples, the fifth wheel should be all the way towards the tractor TestPermit.com is not affiliated, endorsed, or sponsored by state agencies or any motor vehicle and any other departments in the United States, Canada, UK. They provide the air pressure used to operate trailer brakes. 0000008187 00000 n The coupling between a rear trailer and a dolly should have a space between the upper and lower fifth wheels of? You should be sure the converter dolly air tank drain valves are _____ and the pintle hook is _____. The trailer is at the correct height when. A sudden movement with the steering wheel can result in a tipping over rear trailer. Any items you have not completed will be marked incorrect. Take special care when pulling two and three trailers. You must steer gently when pulling trailers. You are doing a walkaround inspection of a double or triple trailer rig. Open. Finsbury Pump Systems 400l (Single Stage) 5.5hp Honda Gx Petrol Engine Park the rear trailer against another trailer, chock the tires and lock the trailer True! 3. 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! the fifth wheel, so trailer is raised slightly when dolly is pushed under it. Calculate the Mach number at section 2. You will speak with recruiters today. Our normal business hours are Monday-Friday 8 a.m. to 5 p.m. (Pacific Time). C 0000006015 00000 n slow to safe speed before entering, then accelerate slightly through the curve. You want to lock your combination to a second trailer that has no spring brakes. 1/32 to 3/32 of an inch. A B A vehicle transporting hazardous materials is required to display placards where? Leave the emergency line shut-off valve closed and open the service line valve. Pickup at South Loop. 1 You can also reach us at (888) 830-2326. Should the shut-off valves on the trailers be open or closed on a set of double trailers? 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. At section 1, where the cross-sectional area is 0.02 m2m^{2}m2, the air is at 40.0 kPa (abs), 60C60^{\circ} \mathrm{C}60C, and M=2.0. Push the brake pedal as hard as you can and hold it there re-couple, You can if you want to, it does not matter. A dolly should be pulled out from a rear trailer using? (done) Chp 23: Cash Flow + Working Capital, Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer. A) one inch of space . You should keep at least ____ seconds of space ahead of you. A. make things look smaller and farther away than they really are The total number of questions. A. always keep your vehicle to the right side of your lane C. closed, You can release the dolly brakes by: C With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. Remember, the service line is not used unless you depress the brake pedal or use the trailer hand valve. some large trucks have curved (convex or spot) mirrors. you are visually checking the coupling of a converter dolly to the rear trailer. Driving doubles/triples is also more dangerous in hot and cold weather driving, as well as on mountain roads. After 15 years on the road I wanted to help people understand the trucking industry and everything that came with the career and lifestyle of an over the road trucker. A. for coupled doubles and triples, be sure that the pintle hook is in the open position 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. A 0000009577 00000 n What three methods can you use to secure a second trailer before coupling? 2023 PA Doubles - Triples CDL Practice Test 3 - CristCDL.com 1/3 For example: If you are traveling 60 MPH and it begins to rain, your suggested 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. A turn of the glad hand attached to the hose will join and lock the couplers. C Blue is used for the service lines, and red for the emergency (supply) lines. When checking your air lines, they must be secure and? 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. The crack the whip effect will topple the rear trailer first. C. use stab or controlled braking, Which of these is true? Why should you not use the trailer hand valve while driving? 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. What does the drivers manual say about how much space you should keep ahead of your truck? To test the tractor protection valve, charge the trailer air brake system, turn off the engine, and Before coupling a trailer, you should make sure it is at the right height using? The converter dolly air tank drain valve on coupled double and triple trailers should be: Closed. Amazon.com: Air Tank Drain Valve B. to do this without wheel chocks you should: supply air to the trailer air system with the tractor and then disconnect the emergency line. That there is no space between upper and lower fifth wheel. A. 0000008166 00000 n [California Commercial Driver Handbook] The weight of a truck: Is a major factor affecting stopping distance. You are driving with double trailers and must use your brakes to avoid a crash. On a triple combination, the shutoff valves at the rear off the middle trailer should be? We are an independent company focused on providing valuable motor vehicle and permit practice test information. Doubles and triples are more likely to turn over than other combination vehicles because of what effect? Compressed air usually has some water and some compressor oil in it. 3. You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. You should check the height of the trailer before connecting a converter dolly to a second or third trailer. 0000007032 00000 n C speed and start spinning again, in turn stopping your skid, All the listed answers would be correct. 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. Converter dollies: When checking the coupling system, make sure that the locking jaws are around the shank of the. fumoto drain valve. Open the emergency line shut-off valve at the rear of the last trailer. When uncoupling a rear trailer, you should remove some weight from the dolly by? you are doing a walkaround inspection of a double or triple trailer rig. Charge the system and pump the brakes with the window down. 0000007487 00000 n the road is dry & visibility is good. All trademarks are property of their respective owners. Make sure pintle hook is latched. A Those that do not have spring brakes have emergency brakes that work from the air stored in the trailer air tank. Tractor-trailers are considered combination vehicles. This would be very dangerous. D you should check the trailer height before connecting a converter dolly to a second or third trailer. Opening the shut off valves on the rear most trailer will ensure the lines are flowing You should keep at least ___ seconds of space ahead of you. Never unlock the pintle hook with the dolly still under the rear trailer. There are more critical parts to check when you have two or three trailers. 1/4 in. They are filled by the emergency (supply) line from the tractor. The last trailer in a combination is most likely to turn over. 2. 11 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. You open the emergency line shut-off valve at the rear of the last trailer and hear air escaping. To check air flows to all trailers, you should let air pressure reach normal then? Slow to a safe speed before entering the curve, then coast through the curve. when testing the coupling of a double trailer the landing gears of the rear trailer should be, you must drive through deep or flowing water . A CDL is required to drive any of the following vehicles: A vehicle with two separate parts - the power unit (tractor) and the trailer. Release Dolly breaks by opening the air tank petcock or if the dolly has a spring break, use the Dolly parking brake control . B Visually check to make sure that the rear trailer is slightly lower than the center of the The road is dry and visibility is good. You can find it here: High Road 2.0. Converter dollies have spring brakes. A the trailer height is right when: the trailer will be raised slightly when the converter dolly is backed under it. Speed for other vehicles is often too fast for a multi-combination unit! True False True If you want to couple a second trailer to you combiantion vehicle, secure it by using the: Trailer emergency air brakes. Many scientists are concerned that the melting of Earth's sea ice will increase Earth's surface temperature. All ABS equipped units coupled to the rear of a tractor-trailer combination forming a double bottom rig, Careful of the wording! Which is most likely to tip over: Did you know you can fill out one quick form here on TruckingTruth and apply to several companies at once for paid CDL training? 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 bent or damaged kingpin on a coupling should be? There are two types of converter dollies. Try our free CDL Doubles and Triples Test Question and Answers Quiz online. You are driving a 100 ft twin trailer combination at 50 mph. The heavier trailer should be in the rear. With the red knob pushed in on the tractor dash, the service line should have air in it. Chock the tires, park on level ground and charge the trailer air tank if it does Hb```f``b`c``e@ (Q6_* C. closed; unlatched, Which of these will result in the best control on a curve? What does the Commercial Driver Handbook say about how much space you should keep ahead of your truck? To do this without wheel chocks you should: Empty trucks: When parking your double or triple combination, you should look for a parking space 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: 0000005733 00000 n Go to the rear of the rig. [California Commercial Driver Handbook] The weight of a truck: Is a major factor affecting stopping distance. 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. Disconnect the glad-hand at the front of the first trailer and listen for air flow. When coupling, be sure to couple the proper glad hands together. converting it into two trailers, A coupling device of three or four axles and a fifth wheel by which a semitrailer can The shut off valves, when in the open position, allows air to flow out to another trailer. The number of correct answers. 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. C. use a light touch on the accelerator and brake pedals, For coupled double and triple trailers, all of the converter dolly shut-off valves should be: PDF Section 7: Doubles and Triples - CDL Study C. engaging the tractor valve protection control, You must drive through deep or flowing water. be coupled to the rear of a tractor-trailer combination forming a hexagon bottom rig, A coupling device of one or two axles and a fifth wheel by which a semitrailer can be The converter dolly air tank drain valve on coupled double and triple trailers should be: A. open B. closed C. partially opened B When inspecting coupled doubles and triples, make sure the pintle hooks are: A. secured to the safety pins B. in the open position C. latched C Which of these is true? 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. Do converter dollies have spring brakes? 7.3 Inspecting Doubles and Triples = Additional Things to Check During a Walkaround Inspection. 4. What does the Driver's manual say about how much space you should keep ahead of your truck? None of the above, 4. 9. The trailer height is right when: The trailer will be raised slightly when the converter dolly is backed under it. B If there is 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. kingpin, That there is grease between upper and lower fifth wheel. 1/2 to 3/4 of an inch Pintle hook latched. D What will happen if there is a major leak in the service air line? The number and size of air tanks varies among vehicles. 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. Hit the article below to see specific information about AOBRDs! how much space should be between the upper and lower fifth wheel? Slow to the safe speed before entering, then accelerate slightly through the curve. When the road is slippery When entering a roundabout, a driver must yield the right-of-way to drivers already in the roundabout and obey all traffic signs. This means. Hook dolly to front trailer. Be sure pintle-eye of dolly is in place in pintle hook of trailer(s). B b. cell a. blood C. may have poor traction due to bouncing and wheel lockup, Before you can supply air to the air tanks of a second trailer you need to: B Go to Section 4: Other Topics This question is in Section 4: Other Topics of our CDL Test Guide. High Road 2.0! How can you test that air flows to all trailers? This has the same value as the %%TIME_ALLOWED%% Variable on the Final Screen. B. you can almost always stop more quickly than you can turn 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. A A. require shorter stopping distances than full ones front of the second trailer. The final procedure when connecting a rear trailer is to? To check if the converter dolly is securely coupled to the rear trailer you should: Pull gently against the pin of the second trailer. B. do not need to be checked as often as flat mirrors because they show a larger area A. use light, steady pressure on the brake pedal The pintle hook should always be secure when the vehicle is in motion. What should you check for when inspecting a converter dolly - Answers If the air supply in the trailer air tank has leaked away, there will be no emergency brakes, and the trailer wheels will turn freely. We wish you the best of luck in your endeavors and are pleased to be of assistance. C 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: Therefore, look far ahead so you can slow down or change lanes gradually when necessary. You are doing a walk around inspection of a double or triple trailer When you do this, you should hear: Which of these statements about emergency steering is true? All other trailer air functions use the emergency line. CDL License Requirements State By State. and ensuring it is secure. Have little braking power because they are small A Open, latched B Open, free C Closed, latched D Closed, free 28. TestPermit.com provides free unofficial review materials for a variety of exams. C. posted speed limits on curves are safe for all trucks, Empty trucks: CDL Doubles & Triples Practice Test 3 - Classic Mode - Trucker Country When connecting the glad hands, press the two seals together with the couplers at a 90-degree angle to each other. Flashcards - Doubles Triples Test #3 - FreezingBlue Did you know you can fill out one quick form here on TruckingTruth and apply to several companies at once for paid CDL training? B. releasing the pintle hook 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. weather passes. Dobles - Triples Pruebas de prctica 3 - NJ 2023 - CristCDL.com It is very important to keep the air supply clean. Open, latched B. are the easiest to stop since there is no shifting cargo 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. Use controlled or stab braking In an application in which vGS=vDS=Vsupply=1.8V,v_{G S}=v_{D S}=V_{\text { supply }}=1.8 \mathrm{V},vGS=vDS=Vsupply=1.8V, a drain current of 2 mA is required of a device of minimum length of 0.18m.0.18 \mu \mathrm{m}.0.18m. When uncoupling doubles or triples, what is important to know about unlocking the pintle hook? NPT thumbscrew style design enables easy installation. Air will not be available to release the trailer spring brakes (parking brakes). Once you have coupled your rear trailer, you should test the coupling by? How should you test the coupling? Which of the following will probably happen if you are driving a double rig and a set of trailer wheels goes into a skid? The braking systems of double and triple trailers are different than those of straight trucks because doubles and triples. Safety should never take second place, so know your stuff!