AZ CDL Combination Practice Test (2024)

1. Which of these statements about brakes is true?

The lighter the vehicle, the more heat the brakes absorb to stop it.
Brake fade does not result from excessive heat.
None of the above.

2. You must check that all shut-off valves are in the open position except the ones:

on the middle trailer of a set of triples.
at the back of the last trailer.
on the first trailer in a set of doubles.

3. _________ rigs are much more likely to roll over in an accident than _________ rigs.

Empty ; fully loaded
Fully loaded ; overloaded
Fully loaded ; empty

4. To reduce the chance of rollover, you should:

distributed the cargo as low as possible inside the trailer.
place the cargo as high as possible inside the trailer.
put the lightest parts of the cargo under the heaviest parts.

5. When more cargo is piled up in a truck, the truck becomes easier to turn over. Fully loaded rigs are _________ to roll over in a crash than empty rigs.

ten times more likely
three times more likely
five times more likely

6. If you unlock the pintle hook with the dolly still under the rear trailer:

the dolly tow bar may fly up.
the brakes could be damaged by the combined forces of the springs and the air pressure.
your vehicle might roll away.

7. If your brakes get wet, it can cause them:

to apply unevenly.
to be weak.
All of the above.

8. When connecting the glad hands, you should press the two seals together with the couplers at a ______ angle to each other.

90 degree
45 degree
30 degree

9. When parking, you should choose a spot:

that allows you to pull forward when you leave.
that requires backing up.
that allows you do a walk around inspection.

10. When backing with a trailer, you should:

look at your line of travel before you begin backing.
check your mirrors on both sides frequently.
All of the above.

Number of questions:	20
Correct answers to pass:	16
Passing score:	80%

CDL COMBINATION PRACTICE TEST (AZ)

AZ CDL Combination Test