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55 Cards in this Set
- Front
- Back
1. Glad hands are used for connecting the: |
Service and emergency air lines from the truck to the trailer. |
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2. Why should you be sure the fifth wheel plate is greased as required? |
To prevent steering problems. |
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3. After connecting the airlines but before backing under the trailer, you should: |
Supply air to the trailer system, then pull out the air supply knob |
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4: The trailer air supply control (also called the tractor protection valve control) should automatically close when the air pressure falls between. |
20 and 45 PSI |
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5. When coupling, the proper position of the 5th is: |
Tilted down towards the end of the tractor |
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6. Which part of the kingpin should the locking jaws close around? |
The shank |
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7. A trailer is most likely to jack knife when it is: |
Empty |
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8. If the spring brakes don't release when you push the trailer air supply control, you should: |
Check the air line connections. |
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9. The best way to tell if your trailer has started to skid is to: |
See it in your mirrors |
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10. To unlock the 5th wheel, pull the release handle to the ____ position |
Open |
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11. When should you use the hand valve to park a combination vehicle? |
Never |
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12. A driver crossed the airlines when hooking up to an old trailer. What happened? |
If the trailer has no spring brakes, they could drive away but wouldn't have trailer brakes. |
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13. You supply air to the trailer tanks by: |
Pushing in the trailer air supply valve |
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14. The front trailer supports are up and the is resting on the tractor. Make sure: |
There is enough clearance between the tractor and the landing gear |
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15. Safety catch for the 5th wheel locking lever must be ___ for a coupling to be complete. |
Over the locking lever |
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16. After you supply to the trailer, make sure the airlines are not crossed and the trailer brakes are working. This is done by: |
Applying and releasing the trailer braiges and listening for brake sounds. |
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17. If the service line comes apart while you are driving a combination vehicle but the emergency line stays together, what will happen right away? |
Nothing is likely to happen until you try to apply the brakes |
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18. Where should the tractor be when you inspect the landing gear after uncoupling the trailer? |
With the tractor frame under the trailer |
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19. What gear should the tractor transmission be in after you have uncoupled the trailer and are inspecting the trailer supports? |
Neutral |
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20. You should not back a tractor under a trailer until the whole air system is |
At normal pressure |
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21. Which of these statements is true? |
"Bobtail" tractors can take longer to stop a combination vehicle loaded to maximum gross weight. |
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22. You are coupling a semi-trailer to your tractor but have not yet backed under. The trailer is at the right height when: |
It will be raised slightly when the tractor is backed under it |
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23. When you are uncoupling a loaded trailer, you should lower the landing gear until it: |
Makes firm contact with the ground, Nd then crank it in lower gear a few extra turns |
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24. In general, the higher the center of gravity of your truck, the: |
Easier it is to turn over |
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25. To be safe when driving behind other vehicles under good conditions, you should leave at least 1 second between your vehicle and the vehicle ahead for each ___ feet of your vehicles length. |
Ten |
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26. You are coupling a tractor to a semi-trailer and have backed up but are not under it. What should you hook up before backing under? |
The emergency and the service air lines. |
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27. A tractor with a ___ trailer requires the shortest amount of stopping distance. |
Fully loaded |
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28. When checking the trailers emergency brakes, the tractor protection control valve should be placed in the ___ position. |
Emergency |
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29. When do you need to use chocks to park a trailer that does not have spring brakes? |
Always |
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30. You are driving a combination vehicle when the trailer breaks away, pulling apart both air lines. You would expect the trailer brakes to come on, and: |
The tractor protection valve to close. |
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31. When you get ready to back under a trailer, you should line up: |
Directly in front of the trailer |
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32. To stop a trailer skid, you should |
Release the service brakes |
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33. The air leakage rate for a combination of two vehicles (engine off, brake off) should not be greater than |
3 PSI per minute |
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34. Before you back under a trailer make sure the: |
Trailer brakes are locked. |
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35. There are 2 things a driver can do to prevent rollover. 1) Go slow around turns and 2) |
Keep the cargo as close to the ground as possible |
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36. After the trailer has been coupled to the tractor, the tractor protection control valve should be placed in the ___ position |
Normal |
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37. When uncoupling a trailer, after you have shut off the trailer air supply and locked the trailer brakes, you should |
Back up gently to ease pressure on the 5th wheel locking jaws. |
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38. After you lock the kingpin into the 5th wheel, you should check the connection by: |
Pulling the tractor ahead gently with the trailer brakes locked |
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39. If you cannot make a turn without entering another traffic lane, you should: |
Turn wide as you complete your turn |
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40. Loss of air pressure in the emergency line causes |
The trailer's emergency brakes to come on |
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41. In normal driving, some drivers use the hand valve before the brake pedal to prevent a jack knife. Which statement is true? |
It should NOT be done |
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41. In normal driving, some drivers use the hand valve before the brake pedal to prevent a jack knife. Which statement is true? |
It should NOT be done |
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42. The tractor protection valve will close and the trailer emergency brakes will come on when there is a major leak in the ___ brake line. |
Emergency |
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43. You have a major leak in the service line and you put on the brakes. Service air pressure will escape Nd cause the |
Trailer emergency brakes to come on |
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44. What will happen if the airlines are crossed when you hook up to an old trailer? |
If the trailer has no spring brakes, you could drive away but you would not have trailer brakes. |
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45. You have pushed in the trailer supply valve. You should not move the tractor until the whole air system is |
At normal pressure |
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46. After you have coupled the trailer, you should begin raising the landing gear by using the ___ gear |
Low |
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47. Why should you lock the airline glad hands to each other ( or keep dummy couplers) when you are not towing trailer? |
It will keep the water out of the lines. |
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48. You want to inspect the trailer supports l. You should place the tractor transmission in which gear after you have uncoupled the trailer? |
Neutral |
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49. When checking that the trailer is securely coupled to the tractor, the landing gear should be |
Slightly raised |
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50. How much space should be between the upper and lower 5th wheel after coupling? |
None |
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51. Which of these vehicles off-track the most? |
5-axle tractor towing a 52-foot trailer. |
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52. If you have coupled with a semi-trailer, where should the front trailer supports be prior to driving away? |
Fully raised with crank handle secured in its bracket |
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53. The 5th wheel locking lever is not locked after the jaws close around the king pin. This means that |
The coupling is not right and should be fixed before driving the coupled unit |
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54. Compared to a straight truck or bus, there are ___ things to inspect on a combination vehicle. |
More |