Sides Seeding Cdl Training -- Combination Vehicles

Front 1

1. Where should the tractor be when you inspect landing gear after uncoupling the trailer?

A) With the tractor frame under the trailer.

B) Completely cleared from the trailer.

C) With the fifth wheel directly beneath the kingpin.

Back 1

A) With the tractor frame under the trailer.

Front 2

2. While driving behind another 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.

B) 20.

C) 30.

Back 2

A) 10.

Front 3

3. There are two things that a driver can do to prevent a rollover. The are: (1) keep the cargo as close to the ground as possible; and (2):

A) Make sure that the brakes are properly adjusted.

B) Keep both hands firmly on the steering wheel.

C) Go slow around turns.

Back 3

C) Go slow around turns.

Front 4

4. The air brake leakage rate for a combination vehicle (engine off, brakes off) should be less than _____ psi per minute.

A) 1/2.

B) 2.

C) 3.

Back 4

C) 3.

Front 5

5. The safest way to make a turn without entering another traffic lane is:

A) You should turn wide before you start the turn.

B) You should turn wide as you complete the turn.

C) You should not make a turn and move to another place where you can make a turn without crossing another lane.

Back 5

B) You should turn wide as you complete the turn.

Front 6

6. The higher the center of gravity of your truck, the:

A) Easier to turn around the corner.

B) More stable while turning.

C) Easier to turn over.

Back 6

C) Easier to turn over.

Front 7

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?

A) The trailer's tank will exhaust through the open line.

B) The emergency trailer brakes will come on.

C) Nothing is likely to happen until you try to apply the brakes.

Back 7

C) Nothing is likely to happen until you try to apply the brakes.

Front 8

8. Glad hands are usually connecting which of these?

A) Electric lines from the tractor to trailer.

B) Kingpin from the trailer to the locking jaws of the fifth wheel.

C) Service and emergency air lines from the vehicle to the trailer.

Back 8

C) Service and emergency air lines from the vehicle to the trailer.

Front 9

9. A driver crosses the air lines when hooking up to an old trailer. What will happen?

A) The hand valve will apply the tractor brakes instead of the trailer brakes.

B) If the trailer has no spring brakes, you could drive away but you wouldn't have trailer brakes.

C) The brake lights will come on when the brake pedal is pressed.

Back 9

B) If the trailer has no spring brakes, you could drive away but you wouldn't have trailer brakes.

Front 10

10. When driving a set of doubles it is necessary to close which shut-off valve?

A) Front.

B) Middle section.

C) Back.

Back 10

C) Back.

Front 11

11. The hand valve should be used:

A) Only with a foot brake.

B) To test the trailer brakes.

C) As a parking brake.

Back 11

B) To test the trailer brakes.

Front 12

12. You are about to back your tractor under a semitrailer. The trailer is at the right height when the:

A) Kingpin is about 1 1/4 inches above the fifth wheel.

B) End of the kingpin is even with the top of the fifth wheel.

C) Trailer will be lifted slightly when the tractor backs under it.

Back 12

C) Trailer will be lifted slightly when the tractor backs under it.

Front 13

13. Your emergency air line breaks or gets pulled apart while you are driving. The loss of pressure will cause the:

A) Air compressor to unload instead of pumping air.

B) Emergency trailer brakes to come on.

C) Trailer supply valve to open.

Back 13

B) Emergency trailer brakes to come on.

Front 14

14. If the brakes are not released when you pushed the trailer air supply valve you should:

A) Check air line connection.

B) Cross the airlines.

C) Check electrical cable.

Back 14

A) Check air line connection.

Front 15

15. Air brake equipped trailers made before 1975:

A) Often do not have spring brakes.

B) Usually need a glad hand converter.

C) Cannot be legally operated on interstate highways.

Back 15

A) Often do not have spring brakes.

Front 16

16. 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 knob.

B) Make sure that the trailer brakes are off.

C) Walk around the rig to be sure that it is clear.

Back 16

A) Supply air to the trailer system, then pull out the air supply knob.

Front 17

17. Which part of the kingpin should the locking jaws close around?

A) The shank.

B) The head.

C) The base.

Back 17

A) The shank.

Front 18

18. How much space should be allowed between upper and lower fifth wheel after coupling?

A) 1/4 inch.

B) Just enough to sit on.

C) Nothing.

Back 18

C) Nothing.

Front 19

19. You have pushed the trailer air supply valve. You should not back a tractor under a trailer until the whole air system is:

A) Empty.

B) At normal pressure.

C) Between 60 and 80 psi.

Back 19

B) At normal pressure.

Front 20

21. 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.

B) The electrical service cable.

C) Nothing. Back up and lock the fifth wheel.

Back 20

A) The emergency and service air lines.

Front 21

22. Tractor with ________ trailer requires the shortest amount of stopping distance?

A) Empty.

B) Partially loaded.

C) Fully loaded.

Back 21

C) Fully loaded.

Front 22

23. After you have coupled the trailer you should have to raise the landing gear by using:

A) Low gear.

B) Intermediate.

C) High gear.

Back 22

A) Low gear.

Front 23

24. You supply air to the trailer tanks by:

A) Pushing in the trailer air supply valve.

B) Pulling out the trailer air supply valve.

C) Connecting the service line glad hands.

Back 23

A) Pushing in the trailer air supply valve.

Front 24

25. Why should you be sure that the fifth wheel plate is greased as required?

A) To ensure a good electrical connection.

B) To prevent steering problems.

C) To reduce heat and noise.

Back 24

B) To prevent steering problems.

Front 25

26. When connecting the glad hands press the two seals with the coupler together at what degree to each other?

A) 45 degree.

B) 90 degree.

C) 180 degrees.

Back 25

B) 90 degrees.

Front 26

27. Which of these statements is true?

A) The brakes and suspension systems of combination vehicles work best with a light load.

B) Light vehicles need more braking power to stop than heavy ones.

C) Bobtail tractors can take longer to stop than a combination vehicle loaded to maximum gross weight.

Back 26

C) Bobtail tractors can take longer to stop than a combination vehicle loaded to maximum gross weight.

Front 27

28. Why should you lock the tractor glad hands to each other (or dummy couplers) when you are not towing a trailer?

A) The connected brake circuit becomes a back up air tank.

B) It will keep dirt or water out of the lines.

C) If you didn't, you could never build system pressure.

Back 27

B) It will keep dirt or water out of lines.

Front 28

29. When backing a tractor under a trailer you should:

A) Always use the lowest reverse gear.

B) Always approach the trailer at a slight angle.

C) Do it quickly to ensure that the kingpin is locked into the fifth wheel.

Back 28

A) Always use the lowest reverse gear.

Front 29

30. After the trailer has been coupled to the tractor, the tractor protection control valve should be placed in what position?

A) Down.

B) Up.

C) Normal.

Back 29

C) Normal.

Front 30

31. The fifth wheel locking lever is not locked after the jaws close around the kingpin. This means that:

A) The trailer will not swivel on the fifth wheel.

B) The parking lock is off and you may drive away.

C) The coupling is not right and should be fixed before driving the coupled unit.

Back 30

C) The coupling is not right and should be fixed before driving the coupled unit.

Front 31

32. Off-tracking or cheating causes which of the following to make the wider pass while making a turn?

A) Tractor towing a 45-foot trailer.

B) Tractor with two 27-foot trailers.

C) Tractor with 53-foot trailer.

Back 31

B) Tractor with two 27-foot trailers.

Front 32

33. The iron trailer supports are up and the trailer is resting on the tractor. Make sure:

A) There is enough clearance between the upper and lower fifth wheels.

B) The safety latch is in unlocked position.

C) There is enough clearance between the tractor frame and the landing gear.

Back 32

C) There is enough clearance between the tractor frame and the landing gear.

Front 33

34. 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.

B) Make contact with the ground and leave the trailer off the fifth wheel.

C) Reaches the ground.

Back 33

A) Make firm contact with the ground, then crackle hits a low gear a few extra turns.

Front 34

36. To stop a trailer skid you should:

A) Use the trailer hand brakes.

B) Release the service brakes.

C) Counter-steer.

Back 34

B) Release the service brakes.

Front 35

37. If you cannot make a turn without entering another traffic lane:

A) You should turn wide when you start the turn.

B) You should turn wide as you complete the turn.

C) Not to make a turn. Go to another place where you won't have to cross into another lane.

Back 35

B) You should turn wide as you complete the turn.

Front 36

38. The air lines on a combination vehicle are often colored to prevent them from mixing up. The emergency line is ________, the service line is ________.

A) Red, blue.

B) Black, yellow.

C) Blue, red.

Back 36

A) Red, blue.

Front 37

39. A semitrailer made before 1975 that are equipped with air brakes:

A) Usually need a glad hand converter.

B) Often do not have spring brakes.

C) Have only a service air line.

Back 37

B) Often do not have spring brakes.

Front 38

40. The air leakage rate for a combination vehicle (engine off, brakes on) should be less than _____ psi per minute.

A) 2.

B) 3.

C) 4.

Back 38

C) 4.

Front 39

41. Compared to a straight truck or bus, there are _______ things to inspect on a combination vehicle.

A) Fewer.

B) The same number.

C) More.

Back 39

C) More.

Front 40

42. When checking the trailer emergency brakes the tractor protection control valve should be placed in what position?

A) Normal.

B) Emergency.

C) Neutral.

Back 40

B) Emergency.

Front 41

44. While checking if the trailer is securely coupled to the trailer the landing gears should be:

A) Fully raised.

B) Slightly raised.

C) Fully lowered.

Back 41

B) Slightly raised.

Front 42

45. Air and electrical lines from the tractor to the trailer should be:

A) Fully tight.

B) Secured but with enough loop to turn.

C) Resting on the frame of the tractor.

Back 42

B) Secured but with enough loop to turn.

Front 43

46. 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.

B) Trailer tank pressure to be lost.

C) Tractor spring brakes to lock up.

Back 43

A) Trailer emergency brakes to come on.

Front 44

47. A tractor with a ______ trailers requires the shortest amount of stopping distance.

A) Empty.

B) Lightly loaded.

C) Fully loaded.

Back 44

C) Fully loaded.

Front 45

48. When you get ready to back under a semitrailer, you should line up:

A) The kingpin to engage the driver's side locking jaw first.

B) Directly in front of the trailer.

C) The left rear outer dual wheel with the kingpin.

Back 45

B) Directly in front of the trailer.

Front 46

49. After you lock the kingpin into the fifth wheel, you should check the connection by:

A) Pulling forward 50 feet, turning right and then left.

B) Backing up with the trailer brakes released.

C) Pulling the tractor ahead gently with the trailer brakes locked.

Back 46

C) Pulling the tractor ahead gently with the trailer brakes locked.

Front 47

50. When should you use the hand valve to park a combination vehicle?

A) To park at loading docks.

B) To park on a grade.

C) Never.

Back 47

C) Never.

Front 48

51. You have coupled with a semitrailer. Where should you put the iron trailer supports before driving away?

A) Raised 1/2 way with the crank handle secured in its bracket.

B) Fully raised with the crank handle secured in its bracket.

C) 3 turns off the top with the crank handle secured in its bracket.

Back 48

B) Fully raised with the crank handle secured in its bracket.

Front 49

52. The safety catch for the fifth wheel locking level must be _______ for a coupling to be complete.

A) Over the locking lever.

B) Under the locking lever.

C) Straight up.

Back 49

A) Over the locking lever.

Front 50

53. 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:

A) Lifting the brake pedal.

B) Watching your mirrors to see if the trailer lights come on.

C) Applying and releasing the trailer brakes and listening for the sound of the brake.

Back 50

C) Applying and releasing the trailer brakes and listening for the sound of the brake.

Front 51

54. Before you back under a trailer, make sure that:

A) The trailer brakes are locked.

B) The tractor protection valve is normal.

C) The air supply knob is in.

Back 51

A) The trailer brakes are locked.

Front 52

55. How should you test the tractor-semitrailer connection for security?

A) Look at it carefully.

B) Rock the trailer back and forth with the trailer brakes locked.

C) Pull gently forward in low gear against the locked trailer brakes then look at it carefully.

Back 52

C) Pull gently forward in low gear against the locked trailer brakes then look at it carefully.

Front 53

56. The front trailer supports are up and the trailer is resting on the tractor. Make sure:

A) There is enough clearance between the top of the tractor tires and nose of the trailer.

B) There is enough clearance between the tractor frame and the landing gear.

C) Both A and B are correct.

Back 53

C) Both A and B are correct.

Front 54

57. To unlock the fifth wheel the locking lever should be placed in the _______ position.

A) Neutral.

B) Closed.

C) Open.

Back 54

C) Open.

Front 55

58. The tractor protection valve will close and the trailer emergency brakes will come on when there is a major leak in the ________ brake line.

A) Service.

B) Parking.

C) Emergency.

Back 55

C) Emergency.

Front 56

59. When coupling, the proper position of the fifth wheel is:

A) Level of the ground.

B) Tilted down toward the end of the trailer.

C) Tilted up toward the end of the trailer.

Back 56

B) Tilted down toward the end of the trailer.

Front 57

60. What gear should the tractor engine be in after you uncouple the trailer and are inspecting the trailer supports?

A) Neutral.

B) Low reverse.

C) High reverse.

Back 57

A) Neutral.

Front 58

61. When uncoupling the trailer, after you shut off the trailer air supply and lock the trailer brakes, you should:

A) Back up gently to ease pressure on the fifth wheel.

B) Put on your tractor parking brakes.

C) Lower trailer landing gear.

Back 58

A) Back up gently to ease pressure on the fifth wheel.

Front 59

62. You are driving a combination vehicle when the trailer breaks away, pulling apart both air lines. You expect the trailer brakes to come on and:

A) The trailer supply valve to stay open.

B) The tractor to lose air pressure.

C) The tractor protection valve to close.

Back 59

C) The tractor protection valve to close.