CDL Combination Vehicles Test 5 – Classic Mode

This is CDL Combination Vehicles Test 5 in our original Classic Mode. Simply click in your answer to each CDL practice test question. When you're finished, check your score and results. You can reset the test and retake it as needed.

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1. When uncoupling, if you park the trailer at an angle...

A you won't have to do as much walking around the vehicle
B you'll have more room to maneuver in the yard
C you'll make the process easier
D you could do damage to the landing gear

2. If you start a trailer skid you should...

A Step on the brakes quickly
B Release the brakes to get traction back
C Use the trailer hand brake
D Slowly apply pressure to the brakes

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. When rolling up the landing gear to complete the coupling process...

A leave the landing gear half way down to make uncoupling easier later
B use low gear until the tractor is supporting the trailer
C use high gear to speed up the process
D grease the landing gear to speed up the process

6. 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

7. 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

8. To prevent rollovers, remember to...

A Keep the load centered
B Keep the load as low as possible
C Go slow around turns
D All of the above

9. "Off-tracking" occurs when you go around a corner and...

A The rear wheels follow a different path than the front wheels
B The rear trailer goes off the road
C The rear wheels follow the front ones in a straight line
D The front of the trailer pulls to the right

10. Large combination vehicles take longer to stop...

A When they are empty
B When they are loaded
C Than bobtail tractors
D It takes the same time whether empty or loaded

End of Test #5

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