CDL Doubles & Triples Test 2 – Classic Mode

This is CDL Doubles and Triples Test 2 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. To test the trailer service brakes you should...

A Lightly test brakes at 5 mph
B Apply hand control and check to see if you feel the trailer brakes come on
C Depress the brake pedal
D Release air to the brakes

2. When pulling triple trailers, which unit is more likely to roll over?

A The front trailer
B The middle trailer
C The last trailer
D The tractor

3. 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

4. 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

5. When steering to avoid a crash while pulling doubles, remember to...

A Keep both hands on the steering wheel
B Stay off the brake while turning
C Be prepared to counter-steer
D All of the above

6. 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

7. 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

8. Should you unhook the pintle hook with the converter dolly still under a trailer?

A Yes, this is standard procedure
B Yes, this keeps the trailer from falling
C No, this could damage the pintle hook
D No, this could result in your injury

9. 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

10. 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 gear

End of Test #2

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