Be sure air-lines are supported and glad hands are properly connected. They provide the air pressure used to operate trailer brakes. The puzzle: At the far left edge, the plates are in contact, so the path length difference between rays 222 and 333 is zero. 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. A How do you check to make sure trailer height is correct before coupling? When uncoupling doubles or triples, what is important to know about unlocking the pintle hook? You should be sure the converter dolly air tank drain valves are _____ and the pintle hook is ____. you want to hook your combination to a second trailer that has no spring brakes. Safety should never take second place, so know your stuff! You should keep at least ___ seconds of space ahead of you. C. add "one car length for every 10 mph", Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer, Incidental Motions & Motions that Bring a Que. Converter dolly air tank drain valve: CLOSED Air lines supported and glad hands properly connected. Which of the following is true about loading cargo into double or triple trailers? HlTo xGf`{iIMh-x||?pbE':X4ZZZRbu7 uvi_RHUkVXBVu{^B3 4e/iw\]RE] YY7i)e V*h(++WQ-]Xm9c5yU6BS" 5HiL,[b)ee:t/ )%BVGpU7T\ZJD on kingpin. 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. B. the emergency line valve open and release air 0000001107 00000 n You are driving a triple trailer and there is a loss of air pressure in the emergency line. You can also reach us at (888) 830-2326. A. air escape from the open valve 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! 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 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. That split second that you release the brakes will allow them to match the vehicles road Ship to Store. 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. Which of these are the correct positions for shut-off valves in doubles and triples? The front trailer in a set of double trailers is most likely to turn over due to the Crack-the-Whip effect. C. use stab or controlled braking, Which of these is true? A low air buzzer will go off indicating something is wrong and either the front or the A. opening the air tank petcock Should the converter dolly air-tank drain valve be open or closed on a double trailer combination? D Always test the trailer brakes before driving with the hand valve or by pulling the air supply (tractor protection valve) control. That there is some space between the upper and lower fifth wheel. Take special care when pulling two and three trailers. To test the tractor protection valve, charge the trailer air brake system, turn off the engine, and You are visually checking the coupling of a converter dolly to the rear trailer. You are driving a 100-feet truck with double trailers at 50 mph. A. fully lowered Do converter dollies have spring brakes? You open the emergency line shut-off valve at the rear of the last trailer and hear air escaping. Delivering to. These dollies will have a yellow lamp on the left side of the dolly. Remember: The trailer air brakes are supplied with air using the emergency line (also called the supply line). In order to receive your Doubles and Triples endorsement, it is required that you pass the states official CDL written Knowledge exam. To check air flows to all trailers, you should let air pressure reach normal then? some large trucks have curved (convex or spot) mirrors. 5. Connect Converter Dolly to Front Trailer Back first semitrailer into position in front of dolly tongue. Many scientists are concerned that the melting of Earth's sea ice will increase Earth's surface temperature. Have little braking power because they are small 0000010285 00000 n Also, this page requires javascript. Always unlock the pintle hook with the dolly still under the rear trailer. Usually need a glad hand converter 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. Time used (Requires timer add on). Eventually, the air will leak away, and then there will be no brakes. A. require shorter stopping distances than full ones Also available in App Store & Google Play. These mirrors: Make things seem smaller and further away than they really are. The coupling between a rear trailer and a dolly should have a space between the upper and lower fifth wheels of? 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. A How much space should be between the upper and lower fifth wheel? Converter dollies are connected to front trailers with a? When you're finished, check your score and results. 0000003261 00000 n When uncoupling a rear trailer, your rig should be parked in a straight line on? What is the most common foundation brake found on heavy vehicles? 0000001956 00000 n You can reset the test and retake it as needed. Otherwise, the dolly tow bar may fly up, possibly causing injury and making it very difficult to re-couple. 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. 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 When coupling twin trailers, you should _______ the pintle hook and secure the dolly support in the _______ position. These dollies will have a yellow lamp on the left side of the dolly Questions You Should Know For Doubles And Triples 1. 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. when driving a truck with more than one trailer, which trailer should be first behind the truck? Should the shut-off valves on the rear of the last trailer be open or closed? B. slow to a safe speed before entering the curve, then accelerate slightly through it [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." This will let the rear wheels roll again and keep the rear wheels from sliding. Antilock Braking Systems on Converter Dollies, Converter dollies built on or after March 1, 1998, are required to have antilock brakes. Which of the following must be connected when coupling tractor to trailer or trailer to trailer? The road is dry and visibility is good. 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. you are driving a 100ft truck eith double trailers at 50mph. Which is most likely to tip over: Hazardous materials must be placarded on all four sides of EACH Trailer. True False True If you want to couple a second trailer to you combiantion vehicle, secure it by using the: Trailer emergency air brakes. Try our free CDL Doubles and Triples Test Question and Answers Quiz online. NPT thumbscrew style design enables easy installation. A 360 degree area of awareness is When you turn with the tractor/triple trailer combination the wheels that off-track (cheat) the most are: You should check trailer height before connecting a converter dolly to a second or third trailer. Calculate the Mach number at section 2. You are driving a 100-feet truck with double trailers at 30 mph. A. closed; latched When connecting the glad hands, press the two seals together with the couplers at a 90-degree angle to each other. The trailer height is right when: The trailer will be raised slightly when the converter dolly is backed under it. We have a new version of this program. With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. 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. 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 B axle will have spring brakes due to the weight of the unit. What is most likely to happen if the trailer protection valve of a double or triple trailer does not function correctly? D We wish you the best of luck in your endeavors and are pleased to be of assistance. Blue is used for the service lines, and red for the emergency (supply) lines. Page 7-6 Commercial Driver's Manual/2.0 = Be sure air lines are supported and glad hands are properly connected. 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: 0000002446 00000 n While inspecting your converter dolly coupling, you should make sure there is _____ between the upper and lower fifth wheel. a. blood you are driving a set of doubles and a set of trailer wheels goes in a skid. d. protein. C However there are some states that allow doubles that are each 48 feet in length. not have spring brakes. A thorough pre-trip inspection should catch any major service line leaks before you begin your trip. A. you can steer more quickly and safely if you hold the wheel with one hand

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