PA CDL Combination Practice Test (2024)

1. While driving, you should use your mirrors to:

know where other vehicles are around you.
check where the rear of your vehicle is while you make turns.
check the condition of the tires and cargo.
All of the above.

2. Poor weight balance:

increases fuel efficiency.
makes it easier to turn.
can make vehicle handling more difficult.
improves handling.

3. Which of the following makes a rollover more likely?

Driving slowly around turns
Keeping the cargo as close to the ground as possible
Driving quickly around turns
Keeping the load centered on your rig

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

put the lightest parts of the cargo under the heaviest parts.
place the cargo as high as possible inside the trailer.
distributed the cargo as low as possible inside the trailer.
None of the above.

5. Older trailers do not have spring brakes. If the air supply leaks away:

the ABS won't work properly.
there will be no emergency brakes.
the trailer will stop normally.
All of the above.

6. What is the minimum tread depth for tires other than front tires?

7. If driving a new vehicle, you should familiarize yourself with the controls and equipment:

as you drive.
before you start driving.
after pulling into a service station.
within the first 50 miles.

8. You should not use the trailer hand brake to straighten out a jackknifing trailer. Why?

The brakes on the trailer wheels will not respond.
You should use the emergency break instead.
The brakes on the trailer wheels caused the skid in the first place.
You should use the service break instead.

9. When backing a tractor under a trailer, you should:

back at an angle.
stop before when the kingpin is locked into the fifth wheel.
always use the lowest reverse gear.
All of the above.

10. What should you do if your vehicle gets stuck on the railroad tracks?

Stay inside the vehicle and call 911.
Call 911, then get out of the vehicle and away from the tracks.
Turn on the emergency flashers and call 911.
Get out of the vehicle and away from the tracks as quickly as possible, then call 911.

CDL COMBINATION PRACTICE TEST (PA)