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Double-Triple Trailers Sample Test F

1. When pulling triple trailers, always put the heaviest trailer:
A In the front
B In the rear
C In the middle
D It doesn't make a difference

2. When coupling twin trailers, you should release the dolly brakes by:
A Dropping the trailer onto the fifth wheel
B Opening the air tank petcock
C Letting the air out of the brake line
D Pushing the air release valve on the dash

3. When connecting the converter dolly to the rear trailer, you should remember to:
A Make sure trailer brakes are locked
B Make sure trailer height is correct
C Raise the landing gear slightly off the ground
D All of the above

4. When coupling the rear trailer, the correct trailer height is:
A Six inches of space between the upper and lower fifth wheel
B Slightly lower than the fifth wheel
C When the locking jaws are closed around the kingpin
D The kingpin touches the fifth wheel

5. To uncouple double trailers, you should park your rig:
A On a slight incline
B On level ground
C In the company parking lot
D On a soft surface

6. To uncouple the converter dolly you should:
A Disconnect safety chains, lower the landing gear and chock the wheels
B Chock the wheels, lower the landing gear and disconnect safety chains
C Lower the landing gear, disconnect safety chains, and chock the wheels
D Chock the wheels, disconnect safety chains and lower the landing gears

7. It is dangerous to unlock the pintle hook with the dolly still under the rear trailer because:
A The dolly tow bar may fly up
B The brakes might release
C The kingpin might break off
D The fifth wheel might not be aligned

8. When inspecting doubles, the shut off valves at the rear of the trailer should be:
A Open at the rear of front trailer, open at the rear of the last trailer
B Open at the rear of front trailer, closed at the rear of the last trailer
C Closed at the rear of front trailer, closed at the rear of the last trailer
D None of the Above

9. To check for air flow to the last trailer:
A Pull forward and step on brake pedal
B Open emergency shut off valve and listen for escaping air
C Step on brake pedal and watch for brake lights
D Test emergency brake lines on level surface

10. You should test your tractor protection valve to avoid:
A The emergency brakes coming on due to loss of air
B The loss of air from the air hose
C The loss of air from your trailer brakes
D All of the above


Score =

Correct answers:






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