0000001354 00000 n the road is dry & visibility is good. Which of these are the correct positions for shut-off valves in doubles and triples? fumoto drain valve. Stay up to date on truck driving industry news. 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. on kingpin. Should I Be A Truck Driver? When uncoupling a rear trailer, your rig should be parked in a straight line on? Go to the rear of the rig. Number of wrong answers. For emergency braking you should: May have poor traction due to bouncing and wheels lockup. Any items you have not completed will be marked incorrect. Calculate the voltage gain of each. Our normal business hours are Monday-Friday 8 a.m. to 5 p.m. (Pacific Time). These mirrors: If the dolly is a two axle unit then 1 A What's a converter dolly? Only a certified diesel mechanic can check this. Wait for air pressure to reach normal, then push in the red trailer air supply knob. 0000001582 00000 n Always test the trailer brakes before driving with the hand valve or by pulling the air supply (tractor protection valve) control. Locking jaws closed on Sketch the shape of the passage between sections 1 and 2. The dolly tow bar may fly up, possibly causing injury and making it very difficult to re-couple. the rig will continue moving in a straight line no matter how much the steering wheel is turned. D A. completely open 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. Doubles and triples must be driven very smoothly to avoid rollover or jacknife. These trailers have no parking brake. The crack the whip effect will topple the rear trailer first. you are driving a 100ft truck eith double trailers at 50mph. The rear trailers shut-off valves should be open and the front closed. To uncouple the rear trailer in a set of doubles, the shut-off valve at the rear of the front trailer should be: Closed. 0000008894 00000 n When coupling twin trailers, you should _______ the pintle hook and secure the dolly support in the _______ position. 0000008166 00000 n The total number of questions. There are more critical parts to check when you have two or three trailers. A major leak in the emergency line will cause the tractor protection valve to close and the trailer emergency brakes to come on. How do you know if your converter dolly is equipped with antilock brakes? Related Question Question: What does this sign mean? To do this without wheels chocks you should: Supply air to the trailer air system with the tractor and then disconnect the emergency line. C. foot pedal, Which of these statements about managing space to the sides is true? The shut off valves, when in the open position, allows air to flow out to another trailer. The last trailer in a combination is most likely to turn over. A. open the shut-off valves at the rear of both trailers NPT thumbscrew style design enables easy installation. You want to lock your combination to a second trailer that has no spring brakes. ADVERTISEMENT ADVERTISEMENT Follow the procedures described later in this section. What is likely to happen? Stop the vehicle by gearing down and sparingly Some do. Tips for Backing Up a Trailer Like a Pro Trucker. A. use light, steady pressure on the brake pedal 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. Be sure air-lines are supported and glad hands are properly connected. With the red knob pushed in on the tractor dash, the service line should have air in it. A bent or damaged kingpin on a coupling should be? Remember however, that is just a suggestion. 1/3 For example: If you are traveling 60 MPH and it begins to rain, your suggested The application only takes one minute. A. closed; latched 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. When coupling, be sure to couple the proper glad hands together. The service air line is only used to control the service brakes (when you press on the brake pedal or use the trailer hand-valve). If you crossed the air lines, you could drive away, but you would not have trailer brakes. Slow to the safe speed before entering, then accelerate slightly through the curve. B. you need about four times as much stopping distance at 40 mph as at 20 mph Doubles and triples take up more space than other commercial vehicles. A. always keep your vehicle to the right side of your lane Locking jaws closed on A converter dolly is a piece of equipment designed to allow commercial trucks, such as semi-trucks, to pull a trailer. C. fully raised, Which of these statements about speed management and braking is true? 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]. Once you have coupled your rear trailer, you should test the coupling by? For emergency braking you should: Closed, free, 8. 9. The individual voltage gains of the first two stages are to be equal, while the gain of the third is to be one-fourth of each of the first two. When inspecting doubles and triples you must make sure there is air all the way to the back of the last trailer, otherwise what may not work? What does the Driver's manual say about how much space you should keep ahead of your truck? Types of converter dollies. Opening the shut off valves on the rear most trailer will ensure the lines are flowing Doubles and triples are extremely prone to control issues and must be Their drawbars differentiate them. with the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the trailer. the trailer will be raised slightly when the converter dolly is backed under it 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 There are two types of converter dollies. You are driving a 100-feet truck with double trailers at 50 mph. On double and triple combinations, you must make sure that which of these is secure? You need to be aware of how parking lots are arranged in order to avoid a long and difficult escape. B. closed 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. 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 Newer trailers have spring brakes just like trucks and truck tractors. C. the service brakes slowly move to the fully applied position, Some large trucks have converted or "spot" mirrors. Check them all. You may be timed. Make a sketch that explains this phenomenon in terms of a feedback loop . A Open The tanks will hold enough air to allow the brakes to be used several times even if the compressor stops working. rear brakes will not work properly. B. pull gently against the pin of the second semitrailer D [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]. "Glad hands" are coupling devices used to connect the service and emergency air lines from the truck or tractor to the trailer. B weather passes. 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. Charge the system and pump the brakes with the window down. Trucks with trailers have a dangerous crack-the-whip effect. 8. Mar 2 - Mar 3. Question 3 Explanation: All of the above. 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. When the road is slippery All ABS equipped units 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? 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 _____. To test the tractor protection valve, charge the trailer air brake system, turn off the engine, and None These dollies will have a yellow lamp on the left side of the dolly. Go to Section 4: Other Topics This question is in Section 4: Other Topics of our CDL Test Guide. What three methods can you use to secure a second trailer before coupling? A sudden movement with the steering wheel can result in a tipping over rear trailer. C 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. HlTo xGf`{iIMh-x||?pbE':X4ZZZRbu7 uvi_RHUkVXBVu{^B3 4e/iw\]RE] YY7i)e V*h(++WQ-]Xm9c5yU6BS" 5HiL,[b)ee:t/ )%BVGpU7T\ZJD It is very important to keep the air supply clean. 0000009577 00000 n How do you know if your converter dolly is equipped with antilock brakes? Secure converter gear support in raised position. Trailer Air Tanks And Shutoff Valves - Page 50. a. blood Should the pintle hook be latched or unlatched when backing a dolly under the second trailer? You must steer gently when pulling trailers. If your tanks have automatic drains, they will keep most moisture out, but you should still open the drains to make sure.
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