You should NOT: You are driving a set of doubles and a set of trailer wheels goes into a skid. B. for doubles and triples, the fifth wheel should be all the way towards the tractor When connecting the glad hands, press the two seals together with the couplers at a 90-degree angle to each other. 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. Ensuring the safety of the public starts with a thorough inspection of all equipment. If you crossed the air lines, you could drive away, but you would not have trailer brakes. Compressed air usually has some water and some compressor oil in it. When you do this, you should hear: you are driving with double trailer and must use your brakes to avoid a crash. All rights reserved Site Map. You want to lock your combination to a second trailer that has no spring brakes. you should keep atleast __seconds of space ahead of you. 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. High Road 2.0! 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. If there is a trailer You are driving a 100-feet truck with double trailers at 30 mph. It is very important to keep the air supply clean. You are doing a walk around inspection of a double or triple trailer rig. Open the emergency line shut-off valve at the rear of the last trailer. There is a school zone ahead. Which of these statements about the handling of doubles and triples is true? What is most likely to happen if the trailer protection valve of a double or triple trailer does not function correctly? speed and start spinning again, in turn stopping your skid, All the listed answers would be correct. Open the shut-off valves at the rear of the last trailer and listen for air flow. when driving a truck with more than one trailer, which trailer should be first behind the truck? B. are the easiest to stop since there is no shifting cargo Which the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the trailer. Connect the Converter Dolly to the Rear Trailer: Test the coupling by pulling against the pin of the second semitrailer. The road is dry and visibility is good. Hazardous materials must be placarded on all four sides of EACH Trailer. you should avoid traveling next to others when possible. 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. Any time you have to D Why should you pull a dolly out from under a trailer before you disconnect it from the trailer in front? B. you can almost always stop more quickly than you can turn You are visually checking the coupling of a converter dolly to the rear trailer. Doubles and triples must be driven very smoothly to avoid rollover or jackknife. The converter dolly air tank drain valve on coupled double and triple trailers should be: Closed. then there is a problem with the ABS system. which of these figures shows how the turn should be made, if you want to couple a second trailer to your combination vehicle, secure it by, the trailers spring brakes & wheel chocks. Open, free When turning a double or triple at an intersection, the turn often cannot be completed without swinging wide. You can find it here: High Road 2.0. recouple. The rear trailer of a triple re-couple, You can if you want to, it does not matter. The weight of the individual trailers will have no noticeable effect on the handling of the vehicle, The weight of all trailers should be nearly the same, within 2% of each other. For emergency braking you should: You are doing a walk around inspection of a double or triple trailer rig. If your tanks have automatic drains, they will keep most moisture out, but you should still open the drains to make sure. rear trailer. 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, enclose converter dolly air tank drain valves utilize the brakes. A You should be sure the converter dolly air tank drain valves are _____ and the pintle hook is _____. 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. front of the second trailer. Which trailer should come first behind the tractor? 12, 3. fifth wheel, so trailer is raised slightly when dolly is pushed under it. Make sure you do not get in a spot you cannot pull straight through. CDL Doubles and Triples Test Question and Answers 2023 [PDF]: Commercial Drivers License Doubles and Triples Endorsements Knowledge Test. 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. Wait for air pressure to reach normal, then push in the red trailer air supply knob. The dolly tow bar may fly up, possibly causing injury, and making it very difficult to The air lines will rupture The trailer brakes will unlock Number of wrong answers. Which of these is most likely to occur? 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? There is more chance for skids and loss of traction. You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. 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? When does the "driver's manual" advise disconnecting the steering axle brakes to help keep the rig straight? These valves permit closing the air lines off when another trailer is not being towed. 11 You may not notice a major leak in the service line until you try to put the brakes on. Flammable materials in the front trailer then it must have the placards on that trailer. kingpin, That there is grease between upper and lower fifth wheel. Air escape from the open valve 2 When uncoupling doubles or triples, what is important to know about unlocking the pintle hook? Pickup at South Loop. Which f these will result in the best control on curves? the road is dry & visibility is good. 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 DMV doubles triples practice test will examine your knowledge of pulling double/triple trailers, coupling and uncoupling, inspecting doubles and triples, and checking air brakes. You should keep at least ____ seconds of space ahead of you. A What happens if you cross the Emergency Air Line and the Service Air Line? You shouldn't stop braking. What value of channel width must the design use? This has the same value as the %%TOTAL%% Variable on the Final Screen. Trucks with trailers have a dangerous crack-the-whip effect. C. the service brakes slowly move to the fully applied position, Some large trucks have converted or "spot" mirrors. 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 0000008166 00000 n You are driving with double trailers and must use your brakes to avoid a crash. 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. Usually need a glad hand converter 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? What do you check when making a visual check of coupling? Which of the following will occur? A. always keep your vehicle to the right side of your lane fumoto drain valve. C. engaging the tractor valve protection control, You must drive through deep or flowing water. A. countersteer How do you check to make sure trailer height is correct before coupling? D 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? B. They are not only longer, but also need more space because they cannot be turned or stopped suddenly. What will happen if there is a major leak in the service air line? 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. Secure converter gear support in raised position. What is a converter dolly? Older trailers do not have spring brakes. For emergency braking you should: May have poor traction due to bouncing and wheels lockup. Doubles and triples are extremely prone to control issues and must be Make sure trailer height is correct. A. make things look smaller and farther away than they really are B "Glad hands" are coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer. Those that do not have spring brakes have emergency brakes that work from the air stored in the trailer air tank. Some large trucks have curved (convex or spot) mirrors. Air pressure is sent from the air tanks to the brakes by relay valves. c. iron some large trucks have curved (convex or spot) mirrors. True or False? Do converter dollies have spring brakes? Allow much more space than is needed for ideal driving condition. Speed for other vehicles is often too fast for a multi-combination unit! The heaviest trailer When checking the coupling system, make sure that the locking jaws are around the shank of the. You should not hear air escaping. C. closed; unlatched, Which of these will result in the best control on a curve? You should be sure the converter dolly air tank drain valves are ____ and the pintle hook is ____. Sketch the shape of the passage between sections 1 and 2. The word part ferrit- means: S-cam brakes are the most common style brakes on large trucks today. Pintle-eye of dolly in place in pintle hook of trailer (s). D. Make sure the spare tire is secured, if it has one. If the fifth wheel on a coupling is too far forward, the tractor frame may hit? Slow to a safe speed before entering the curve, then coast through the curve. What should you check for when inspecting the converter dolly and the pintle hook? If your converter dolly has to be moved over a distance to bring it to your semitrailer, you should? What should you check for when inspecting a converter dolly? Closed, latched 3. They provide the air pressure used to operate trailer brakes. To uncouple the rear trailer in a set of doubles, the shut-off valve at the rear of the front trailer should be: Closed. A truckers workspace is a small moving office Read More. 0000008915 00000 n Doubles and triples take up more space than other commercial vehicles. If you do, there is a problem. The driver must yield the right-of-way to other vehicles when merging and when entering a highway from an alley. 27. Air flows steadily and isentropically through a passage. Mar 2 - Mar 3. True! None of the above, 2. 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]. driven with care to avoid losing control, Make sure the spare tire is secured, if it has one, Make sure the converter dolly air tank drain valve is closed, Make sure safety chains are secured to the trailers, All of the above. These mirrors: make things seem smaller & further away then they really are. The dolly will have a yellow lamp on the drivers (left) side. Take special care when pulling two and three trailers. For emergency braking you should: weather passes. This has the same value as the %%SCORE%% Variable on the Final Screen. 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. and the converter dolly air tank drain valve should be _____. the crack-whip effect that triubkes trucks with trailers is most likely to cause a tip over when. B. pull gently against the pin of the second semitrailer not have spring brakes. For emergency braking you should: If you feel B. slightly open 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: If there is Did you know you can fill out one quick form here on TruckingTruth and apply to several companies at once for paid CDL training? Why is there still destructive interference? How To Use Cruise Control Effectively As A Truck Driver. 0000001354 00000 n you are driving on a slippery road during the day. You should keep at least ____ seconds of space ahead of you. Terms in this set (43) Converter dollies are used to connect: A tractor-trailer combination to another trailer. 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. With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. B We have a new version of this program. 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. Open. 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. Feel Free to add additional fields for the Quiz Taker to complete using the "Add Fields" options to the right. The trailer height is right when: The trailer will be raised slightly when the converter dolly is backed under it. 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 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. 0000005554 00000 n When uncoupling a rear trailer, your rig should be parked in a straight line on? 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. A Open, latched B Open, free C Closed, latched D Closed, free 28. If spare tire is carried on converter gear (dolly), make sure it's secured. A connection device of one axle used to disconnect a semitrailer combination vehicle 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. 7. How can you be sure you supplied air to a second trailer? Time used (Requires timer add on). Doubles and triples must be driven very smoothly to avoid rollover or jackknife. Explore now! In order to receive your Doubles and Triples endorsement, it is required that you pass the state's official CDL written Knowledge exam. 3. Before you can supply air to the air tanks of a second trailer you need to.