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Drivers who want to drive combination vehicles must pass the combination vehicles test. The Pennsylvania CDL combination test consists of 20 questions, and you'll need at least 16 correct answers to pass (80%). The test covers the combination vehicles section of the Pennsylvania CDL Manual. Take this practice test now to prepare for the actual PA CDL combination test!
1. Empty trucks:
require a shorter stopping distance than full trucks.
require a greater stopping distance than full trucks.
require the same stopping distance than full trucks.
None of the above.
2. When checking the lights before driving:
the engine must be running.
make sure the parking brake is not set.
you should turn off the engine.
you should check them from inside the vehicle.
3. One way to prevent hydroplaning is to:
take curves at higher speeds.
make sure you have enough tread on your tires.
use the controlled braking method.
have less than 4/32 inch tread depth in every major groove on front tires.
4. After a tire has been changed, you should:
decrease tire pressure.
wait at least 30 minutes before driving.
deflate the tire to 15 psi.
stop a short while later and check that the nuts are tight.
5. When you turn suddenly while pulling doubles, which trailer is most likely to turn over?
The front trailer is twice as likely to turn over as the tractor.
The rear trailer is twice as likely to turn over as the tractor.
All trailers are equally likely to turn over.
None of the above.
6. If you must drive slowly, how should you alert following drivers?
Turn on your taillights
Flash your brake lights
Help them out by signaling when it is safe to pass
Use your emergency flashers if it is legal
7. On front tires, tread should be at least:
1/16 inch
4/32 inch
4/16 inch
2/32 inch
8. Overloading can have negative effects on:
speed control.
All of the above.
9. If are being followed closely, you should:
flash your brake lights.
increase your following distance.
decrease your following distance.
change lanes quickly.
10. As part of the final air brake check, you should:
Test air leakage rate.
Test low pressure warning signal.
Check air compressor governor cut-in and cut-out pressure.
All of the above.
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PA CDL Combination Test

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