CDL Combination Vehicles Test 2 – Classic Mode

This is CDL Combination Vehicles 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. 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

2. The earliest way to notice a trailer skid is...

A By feeling the pull on your steering wheel
B By feeling a jerking in the back of the tractor
C By seeing it in your mirrors
D By hearing the squeal from the tires

3. 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

4. The trailer should be lowered so that...

A the trailer is far above the fifth wheel
B the tractor strikes the nose of the trailer
C you can use the landing gear to make any adjustments
D it's raised slightly when the tractor's backed under it

5.Which of the following steps comes first?

A apply the trailer brakes
B raise the landing gear
C put the transmission in reverse
D connect the air supply lines

6. Before you begin coupling...

A check the condition of the tractor frame
B check your path for hazards
C pre-position the fifth wheel
D put the spring brakes on

7. The trailer air supply control...

A Is a red, triangular-shaped knob
B Is a yellow, square knob
C Is a red, square knob
D Is a red, eight sided knob

8. 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

9. 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

10. 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

End of Test #2

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