FREE PA CDL Combination Test (2024)

1. As part of your vehicle inspection, you are checking that air flows to all trailers. After using the trailer handbrake to provide air to the service line, you go to the rear of the rig. When you open the emergency line shut-off valve at the rear of the last trailer, you should hear:

a mechanical vibration.
the service line valve close.
air escaping from the open valve.
a thumping sound.

2. Before entering an intersection, make sure that:

That there is enough room for the rear of your vehicle to clear the stop line on your side.
there's enough room to get at least halfway across.
there is sufficient space to clear it.
accelerate smoothly and change gears as necessary.

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

To park at loading docks.
Never.
Always.
When parking downhill.

4. Which of the following is NOT a step in backing up with a trailer?

Backing quickly when the path is straight
Looking at your line of travel before you begin
Backing slowly
Checking the outside mirrors on both sides frequently

5. Empty trucks require _____ stopping distances because empty vehicles have ______ traction.

less; less
less; more
greater; more
greater; less

6. If a vehicle is equipped with ABS, when you start the engine:

the trailer emergency brakes will come on.
the ABS indicator light on the dash should come on and then turn off.
the spring brakes will come on.
the wheels will lock up.

7. If a trailer does not have spring brakes, to keep the trailer from moving you should:

park on a slight decline.
close the brake valve.
use wheel chocks.
use the service brakes.

8. If you try to couple when the trailer is too low:

the tractor may strike and damage the trailer nose.
it might not couple correctly.
the tractor could roll away.
All of the above.

9. The two most important things that a driver can do to prevent a rollover when driving a combination vehicle are:

Keeping cargo near center of vehicle and driving slowly on the highway
Keeping cargo near the center of the vehicle and driving slowly on turns
Keeping cargo near the ground and driving slowly on the highway
Driving slowly around turns and keeping the cargo as close to the ground as possible

10. When checking the air and electric lines to the trailer, be sure that the air lines are properly connected to the gland hands, and are:

properly greased.
secured with enough slack for turns.
secured with enough air leaks for turns.
None of the above.

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

PA CDL COMBINATION PRACTICE TEST

PA CDL Combination Test