CDL Combination Vehicles Test 3 – Classic Mode

1. You should not back a tractor under a trailer until the whole air system is:

A Between 60 and 80 psi
B Empty.
C Bled down to half the maximum pressure
D At normal pressure

2. You are coupling a semi trailer to your tractor but have not yet backed under. The trailer is at the right height when:

A It will be raised slightly when the tractor is backed under it.
B The kingpin is about 1 1/4 inches above the fifth wheel.
C The end of the kingpin is even with the top of the fifth wheel.
D The fifth wheel is sure to miss the kingpin.

3. Which part of the kingpin should the locking jaws close around?

A The base
B The shank
C The shiny section
D The head

4. When you get ready to back under the semi trailer you should line up:

A About 12 degrees off the line of the trailer.
B The kingpin to engage the driver's side locking jaw first.
C Exactly one trailer length in back of the trailer.
D Directly in front of the trailer.

5. How should you test the tractor semi trailer connection for security?

A Pull gently forward in low gear against the locked trailer brakes, then look at it carefully.
B Put the tractor in gear and pull ahead with a sharp jerk.
C Rock the trailer back and forth with the trailer brakes locked.
D Don't worry. The connection should be fine.

6. When should you use the hand valve to park a combination vehicle?

A To park at loading docks.
B Never
C To park on a grade
D In sub-freezing temperatures.

7. You supply air to the trailer tanks by:

A Pushing in the trailer air supply valve.
B Pulling out the trailer air supply valve.
C Connecting the blue line to the red line.
D Connecting the service line glad hand.

8. Why should you be sure that the fifth wheel plate is greased as required?

A To reduce heat and noise
B To prevent steering problems
C To ensure good electrical connections
D To make uncoupling easier.

9. After you supply air to the trailer, make sure the air lines are not crossed and the trailer brakes are working. This is done by:

A Applying and releasing the trailer brakes and listening for brake sounds.
B Lifting the brake pedal.
C Turning on the parking brakes from the cab.
D Releasing the tractor brakes.

10. There are two things that a driver can do to prevent a roll over. They are: (1) Keep the cargo as close to the ground as possible; and (2):

A Make sure that the brakes are properly adjusted.
B Keep the fifth wheel's free play as tight as possible.
C Go slowly around turns.
D Never drive a tanker.

End of Test #3

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