Combination Vehicle
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62 questions – 30 min
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Question 1 of 62
1. Question
1 pointsWhere should the tractor be when you inspect landing gear after uncoupling the trailer?
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Question 2 of 62
2. Question
1 pointsWhile driving behind another vehicle under the 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?
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Question 3 of 62
3. Question
1 pointsThere 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):
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Question 4 of 62
4. Question
1 pointsThe air brake leakage rate for a combination vehicle (engine off, brakes off) should be less than ___ psi per minute.
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Question 5 of 62
5. Question
1 pointsThe safest way to make turn without entering another traffic lane is:
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Question 6 of 62
6. Question
1 pointsThe higher the center of gravity of your truck, the:
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Question 7 of 62
7. Question
1 pointsIf the service line cornes apart while you are driving a combination vehicle but the emergency line stays together, what will happen right away?
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Question 8 of 62
8. Question
1 pointsGlad hands are usually connecting which of these?
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Question 9 of 62
9. Question
1 pointsA driver crosses the air lines when hooking up to an old trailer. What will happen?
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Question 10 of 62
10. Question
1 pointsThe hand valve should be used:
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Question 11 of 62
11. Question
1 pointsWhen driving a set of doubles it is necessary to close which shut-off valve in the last trailer.
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Question 12 of 62
12. Question
1 pointsIf the service line comes apart while you are driving a combination vehicle but the emergency line stays together, what will happen right away?
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Question 13 of 62
13. Question
1 pointsYou are about to back your tractor under a semitrailer. The trailer is at the right height when the:
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Question 14 of 62
14. Question
1 pointsYour emergency air line breaks or gets pulled apart while you are driving. The loss of pressure will cause the:
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Question 15 of 62
15. Question
1 pointsIf the brakes are not released when you pushed the trailer air supply valve you should:
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Question 16 of 62
16. Question
1 pointsAir brake equipped trailers made before 1975:
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Question 17 of 62
17. Question
1 pointsThere are two things that a driver can do to prevent a rollover. They are: (1) go slow around turns; and (2):
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Question 18 of 62
18. Question
1 pointsAfter connecting the air lines but before backing under the trailer you should:
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Question 19 of 62
19. Question
1 pointsWhich part of the kingpin should the locking jaws close around?
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Question 20 of 62
20. Question
1 pointsHow much space should be allowed between upper and lower fifth wheel after coupling?
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Question 21 of 62
21. Question
1 pointsYou have pushed the trailer air supply valve. You should not back a tractor under a trailer until the whole air system is:
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Question 22 of 62
22. Question
1 pointsYou are coupling tractor to a semitrailer. You have connected the airlines. Before backing under the trailer you should:
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Question 23 of 62
23. Question
1 pointsYou are coupling a tractor to a semitrailer and have backed up but are not under it. What should you hook up before backing under?
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Question 24 of 62
24. Question
1 pointsTractor with _____ trailer requires the shortest amount of stopping distance
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Question 25 of 62
25. Question
1 pointsAfter you have coupled the trailer you should have to raise the landing gear by using:
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Question 26 of 62
26. Question
1 pointsYou supply air to the trailer tanks by:
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Question 27 of 62
27. Question
1 pointsWhy should you be sure that the fifth wheel plate is greased as required?
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Question 28 of 62
28. Question
1 pointsWhen connecting the glad hands press the two seals with the coupler together at what degree to each other?
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Question 29 of 62
29. Question
1 pointsWhich of these statements is true?
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Question 30 of 62
30. Question
1 pointsWhy should you lock the tractor glad hands to each other (or dummy couplers) when you are not towing a trailer?
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Question 31 of 62
31. Question
1 pointsWhen backing a tractor under a trailer you should:
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Question 32 of 62
32. Question
1 pointsAfter the trailer has been coupled to the tractor, the tractor protection control valve should be placed in what position?
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Question 33 of 62
33. Question
1 pointsThe fifth wheel locking lever is not locked after the jaws close around the kingpin. This means that:
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Question 34 of 62
34. Question
1 pointsOff-tracking or cheating causes of which of these to follow the wider pass while making a turn?
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Question 35 of 62
35. Question
1 pointsThe iron trailer supports are up and the trailer is resting on the tractor. Make sure:
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Question 36 of 62
36. Question
1 pointsWhen you are uncoupling a loaded trailer you should lower the landing gear until it:
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Question 37 of 62
37. Question
1 pointsWhat will happen if the air lines are crossed when you hook up to an old trailer?
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Question 38 of 62
38. Question
1 pointsTo stop a trailer skid you should:
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Question 39 of 62
39. Question
1 pointsIf you cannot make a turn without entering another traffic lane:
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Question 40 of 62
40. Question
1 pointsThe air lines on a combination vehicles are often colored to prevent then from mixing up. The emergency line is________, the service line is________.
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Question 41 of 62
41. Question
1 pointsThe air leakage rate for a combination vehicle (engine off, brakes on) should be less than ______ psi per minute.
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Question 42 of 62
42. Question
1 pointsCompared to a straight truck or bus there are______ things to inspect in combination vehicle
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Question 43 of 62
43. Question
1 pointsWhen checking the trailer emergency brakes the tractor protection control valve should be placed in what position?
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Question 44 of 62
44. Question
1 pointsWhile checking if the trailer is securely coupled to the trailer the landing gears should be:
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Question 45 of 62
45. Question
1 pointsAir and electrical lines from the tractor to the trailer should be:
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Question 46 of 62
46. Question
1 pointsYou have a major leak in the service line and you put on the brakes. Service air will escape and cause the:
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Question 47 of 62
47. Question
1 pointsA tractor with a _______ trailers requires the shortest amount of stopping distance.
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Question 48 of 62
48. Question
1 pointsWhen you get ready to back under a semitrailer you should line up:
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Question 49 of 62
49. Question
1 pointsAfter you lock the kingpin into the fifth wheel, you should check the connection by:
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Question 50 of 62
50. Question
1 pointsWhen should you use the hand valve to park a combination vehicle?
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Question 51 of 62
51. Question
1 pointsYou have coupled with a semitrailer. Where should you put the iron trailer supports before driving away?
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Question 52 of 62
52. Question
1 pointsThe safety catch for the fifth wheel locking lever must be _______ for a coupling to be complete.
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Question 53 of 62
53. Question
1 pointsAfter you supply air to the trailer, make sure the air lines are not crossed and the trailer brakes are working. This is done by:
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Question 54 of 62
54. Question
1 pointsBefore you back under a trailer, make sure that:
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Question 55 of 62
55. Question
1 pointsHow should you test the tractor-semitrailer connection for security?
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Question 56 of 62
56. Question
1 pointsThe front trailer supports are up and the trailer is resting on the tractor. Make sure:
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Question 57 of 62
57. Question
1 pointsTo unlock the fifth wheel the locking lever should be placed in the _______ position.
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Question 58 of 62
58. Question
1 pointsThe tractor protection valve will close and the trailer emergency brakes will come on when there is a major leak in the ________ brake line.
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Question 59 of 62
59. Question
1 pointsWhen coupling, the proper position of the fifth wheel is:
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Question 60 of 62
60. Question
1 pointsWhat gear should the tractor engine be in after you uncouple the trailer and are inspecting the trailer supports?
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Question 61 of 62
61. Question
1 pointsWhen uncoupling the trailer, after you shut off the trailer air supply and lock the trailer brakes, you should:
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Question 62 of 62
62. Question
1 pointsYou are driving a combination vehicle when the trailer breaks away, pulling apart both air lines. You expect the trailer brakes to come on and
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