Combination Vehicles Sample Test G
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Combination Vehicles Sample Test G

1. The service air line is controlled by:
A The pressure applied to the line by the foot brake or the trailer hand brake
B The relay valve which connects the trailer air tanks to the trailer air brakes
C The relay valve which sends air pressure from the trailer air tank to the trailer brake chambers
D All of the above

2. A device which connects the service and emergency air lines from the truck to the trailer is called:
A Relay switch
B Glad hands
C Service couplers
D Shut off valves

3. When coupling the glad hands, you should NOT do the following:
A Clean the couplers before a connection is made
B Press the two seals together at a 90 degree angle
C Cross air supply lines to test them for leaks
D Match the colors to each other, or read the tags before connecting

4. If you cross connect the two air lines the following will result:
A Nothing, the lines are interchangeable
B You will not have air going to the trailer brakes
C Your tractor brakes will lock up
D You could not move the tractor

5. The fifth wheel should be checked to see if:
A There is damage or missing parts
B It is properly greased
C The jaws are open
D All of the above

6. When coupling the trailer, back up slowly until:
A The load shifts inside the trailer
B The fifth wheel just touches the trailer
C You can see the rear wheels in the mirror
D You hit the front of the trailer with the tractor

7. In order to supply air to the trailer, you must first:
A Push in the tractor protection valve.
B Pull out the "air supply' knob
C Stop engine so you can hear the brakes
D Cross the air lines to check for leaks

8. A king pin is:
A The pin which locks the air brake lines together
B A pin which locks the trailer to the tractor on the fifth wheel
C A pin which holds the wheels on the axles
D The pin a driver receives for safe driving

9. In order to inspect the coupling you should:
A Make sure there is space between the upper and lower fifth wheel
B Check that the locking lever is in the open position
C Make sure the fifth wheel jaws are open
D Use a flashlight if necessary

10. You should crank the landing gear until:
A It is six inches off the ground
B You can clear railroad tracks
C The crank handle is loose
D It is as far up as it will go


Score =
Correct answers:






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