FREE AK CDL Combination Test (2024)

1. If you discover a fire, before opening trailer doors you should:

have a helper open the doors.
feel the doors to see if they are hot.
use the fire extinguisher on the doors.

2. To be in the proper position for coupling, the fifth wheel should:

have its jaws closed around the shank of the kingpin.
tilted up towards the rear of the tractor.
be tilted down towards the rear of the tractor.

3. Hydroplaning:

can occur at speeds as low as 30 mph.
only occurs at extremely high speeds.
only happens when tire pressure is higher than normal.

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

5. When driving on slippery surfaces, you should:

make turns as quickly as possible.
change lanes often.
not pass slower vehicles unless necessary.

6. If your trailer starts to skid, you should:

release the brakes to get traction back.
keep the rear of your vehicle close to the curb.
use the trailer hand brake (if you have one) to straighten out the rig.

7. Combination vehicles usually:

are shorter than single than single CMVs.
are easier to drive than single than single CMVs.
require more driving skill than single CMVs.

8. When the wheels of a trailer lock up, the trailer will tend to swing around. This is more likely to happen when:

the trailer is empty or lightly loaded.
the trailer is overloaded.
the trailer is fully loaded.

9. An Anti-lock Braking System:

increases a vehicle's stopping power.
increases the distamce required to stop on slippery surfaces.
keeps your wheels from locking when you brake hard.

10. What is the emergency air line for?

It controls the front brakes of the tractor in case of an emergency.
It tells you the amount of brake pressure you need to stop the vehicle.
It supplies air to the trailer air tanks, and controls the emergency brakes on combination vehicles.

AK CDL COMBINATION PRACTICE TEST