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This document presents a series of scenarios and questions related to the operational procedures of coupling and operating a tractor-semitrailer combination vehicle. It covers critical topics such as air line management, emergency procedures, safety checks, and designated practices to ensure the safe and efficient handling of trailers. The content is structured in a question-and-answer format, emphasizing practical knowledge for drivers in maintaining safety and compliance while operating large vehicles.

1.Where should the tractor be when you inspect landing gear after uncoupling the trailer? A: With the tractor frame under the trailer. 2. While driving behind other vehicle under good condition you should allow at least one second between your vehicle and the vehicle ahead for each ……..(how many) feet of your vehicle length? A:10 3.There are two things that a driver can do to prevent a rollover. They are : (1)keep the cargo as close to the ground as possible; and(2): C: Go slow around turns. 4.The air brake leakage rate for a combination vehicle (engine off,brakes off) should be less than …….psi per minute. C: 3 5.The safest way to make turn without entering another traffic lane is: B: You should turn wide as you complete the turn. 6.The higher the center of gravity of your truck,the: C:Easier to turn over. 7. If the service line comes apart while you are driving a combination vehicle but the emergency line stays together ,what will happen right away? C: Nothing is likely to happen until you try to apply the brakes. 8. Glad hands are usually connecting which of these? C: Service and emergency air lines from the vehicle to the trailer. 9. A driver crosses the air lines when hooking up to an old trailer. What will happen? B:If the trailer has no spring brakes , you could drive away but you wouldn’t have trailer brakes. 10. The hand valve should be used: B: To test the trailer brakes. 11. When driving a set of doubles it is necessary to close which shut-off valve in the last trailer. C: Back. 12. If the service line comes apart while you are driving a combination vehicle but the emergency line stays together ,what will happen right away? C: Nothing is likely to happen until you try to apply the brakes. 13. You are about to back your tractor under a semitrailer. The trailer is at the right height when the: C: Trailer will be lifted slightly when the tractor backs under it. 14. Your emergency air line breaks or gets pulled apart while you are driving.The loss of pressure will cause the: B: Emergency trailer brakes to come on. 15. If the brakes are not released when you pushed the trailer air supply valve you should: A:Check air line connection. 16. Air brake equipped trailers made before 1975: A: Often do not have spring brakes. 17. There are two things that driver can do to prevent a rollover. They are : (1) go slow around turns; and (2): B: Keep the cargo as close to the ground as possible. 18. After connecting the air lines but before backing under the trailer you should: A: Supply air to the trailer system, then pull out the air supply. 19. Which part of the kingpin should the locking jaws close around? A:The shank. 20. How much space should be allowed between upper and lower fifth wheel after coupling? C: Nothing. 21. You have pushed the trailer air supply valve. You should not back a tractor under a trailer until the whole air system is: B: At normal pressure. 22. You are coupling tractor to a semitrailer. You have connected the airlines. Before backing under the trailer you should: A: Supply air to the trailer system,then pull out the air supply knob. 23. You are coupling a tractor to a semitrailer and have backed up but are not under it. What should you hook up before backing under? A:The emergency and service air lines. 24. Tractor with ……….. trailer requires the shortest amount of stopping distance. C: Fully loaded. 25. There are two things that a driver can do to prevent a rollover.They are : (1) keep the cargo as close to the ground as possible; and (2): C: Go slow around turns. 26. After you have coupled the trailer you have to raise the landing gear by using: A:low gear 27. You supply air to the trailer tanks by: A: Pushing in the trailer air supply valve. 28.There are two things that a driver can do to prevent a rollover. They are ;(1) go slow around turns; and(2): B: Keep the cargo as close to the ground as possible. 29. Why should you be sure that the fifth wheel plate is greased as required? B: To prevent steering problems. 30.Your emergency air line breaks or gets pulled apart while you are driving.The loss of pressure will cause the: C:Emergency trailer brakes to come on. 31. When connecting the glad hands press the two seals with the coupler together at what degree to each other? B: 90 degree 32. Which of these statements is true? C: Bobtail tractors can take longer to stop than a combination vehicle loaded to maximum gross weight. 33.Why should you lock the tractor glad hands to each other(or dummy couplers) when you are not towing a trailer? B: It will keep dirt or water out of the lines. 34. When backing a tractor under a trailer you should: A: Always use the lowest reverse gear. 35. After the trailer has been coupled to the tractor,the tractor protection control valve should be placed in what position? C: Normal 36. The fifth wheel locking lever is not locked after the jaws close around the kingpin.This means that: C:The coupling is not right and should be fixed before driving the coupled unit. 37. Off-tracking or cheating causes of which of these to follow the wider pass while making a turn? A: Tractor towing a 45-feet trailer. 38. The iron trailer supports are up and the trailer is resting on the tractor. Make sure: C: There is enough clearance between the tractor frame and the landing gear. 39. When you are uncoupling a loaded trailer you should lower the landing gear until it: A: Make firm contact with the ground,then crackle hits a low gear a few extra turns. 40.What will happen if the air lines are crossed when you hook up to an old trailer? B: If the trailer has no spring brakes,you could drive away but you wouldn’t have trailer brakes. 41. There are two things that a driver can do to prevent a rollover.They are: (1) keep the cargo as close to the ground as possible ;and (2): C: Go slow around turns. 42. To stop a trailer skid you should: B:Release the service brakes. 43. If you cannot make a turn without entering another traffic lane: B: You should turn wide as you complete the turn. 44. The air lines on a combination vehicles are often colored to prevent then from mixing up. The emergency line is………. ,the service line is……….. A: Red,blue. 45. The semitrailer made before 1975 that are equipped with the air brakes: B:Often do not have spring brakes. 46. The air leakage rate for a combination vehicle(engine off,brakes on) should be less than ……psi per minute. C:4 47. Compared to a straight truck or bus there are ………things to inspect in combination vehicle. C: More 48. When checking the trailer emergency brakes the tractor protection control valve should be placed in what position? B: Emergency. 49. In normal driving , some drivers use the hand valve before the brake pedal to prevent a jackknife. Which of the statements is true? A: it should not be done. 50. While checking if the trailer is securely coupled to the trailer the landing gears should be: B: Slightly raised. 51. Air and electrical lines from the tractor to the trailer should be: B:Secured but with enough loop to turn. 52.You have a major leak in the service line and you put on the brakes.Service air will escape and cause the: A:Trailer emergency brakes to come on. 53.A tractor with a …….. trailers requires the shortest amount of stopping distance. C: Fully loaded. 54.When you get ready to back under a semitrailer you should line up: B:Directly in front of the trailer. 55. Off-tracking or cheating causes of which of these to follow the wider pass while making a turn? A: Tractor towing a 45-feet trailer. 56. You should not back a tractor under a trailer until the whole air system is : B: At normal pressure. 57. After you lock the kingpin into the fifth wheel,you should check the connection by: C. Pulling the tractor ahead gently with the trailer brakes locked. 58.When should you use the hand valve to park a combination vehicle? C: Never. 59. You have coupled with a semitrailer. Where should you put the iron trailer supports before driving away? B: Fully raised with the crank handle secured in its bracket. 60. The safety catch for the fifth wheel locking lever must be………for a coupling to be complete. A: Over the locking lever. 61. After you supply air to the trailer, make sure the air lines are not crossed and the trailer brakes are working. This is done by: C: Applying and releasing the trailer brakes and listening for the sound of the brake. 62.Before you back under a trailer,make sure that: A: The trailer brakes are locked. 63. How should you test the tractor-semitrailer connection for security? C: Pull gently forward in low gear against the locked trailer brakes then look at it carefully. 64. The front trailer supports are up and the trailer is resting on the tractor. Make sure: C:Both A and B are correct.(There is enough clearance between the top of the tractor tires and nose of the trailer)(There is enough clearance between the tractor frame and the landing) 65.To unlock the fifth wheel the locking lever should be placed in the ……… position. C:Open 66. The tractor protection valve will close and the trailer emergency brakes will come on when there is a major leak in the…………….. brake line. C:Emergency 67. When coupling, the proper position of the fifth wheel is: B:Tilted down toward the end of the trailer. 68. What gear should the tractor engine be in after you uncouple the trailer and are inspecting the trailer supports? A: Neutral. 69. При расцеплении тягача от прицепа после перекрытия подачи воздуха и включения тормозов прицепа вы должны: A: Back up gently to erase pressure on the fifth wheel. 70. You are driving a combination vehicle when the trailer breaks away, pulling apart both air lines.You expect trailer brakes to come on and: C:The tractor protection valve to close.