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Safely pulling double and triple trailers requires knowledge and skill. If you want to pull double or triple trailers, you must add the Doubles/Triples (T) endorsement to your Class A CDL. The Pennsylvania doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The PA CDL doubles triples test covers the following sections of the Pennsylvania CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this PA CDL practice test now to prepare for the actual test!
1. The application pressure gauge:
shows how much air pressure is being applied to the brakes.
tells you how much pressure is in the air tanks.
protects the tank and the rest of the system from too much pressure.
stops the compressor from pumping air.
2. You are driving a modern truck with a manual transmission. When going down a hill you should usually:
use the same gear you would use to go up the hill.
downshift after your speed has already built up.
use a lower gear than would be required to go up the hill.
shift into neutral and coast.
3. You should be especially alert for drunk drivers:
late at night.
in the early evening.
around shopping areas.
in the morning.
4. With low beams, drivers can see ahead about:
100 feet
150 feet
15 feet
250 feet
5. The safety valve is usually set to open at:
75 psi.
200 psi.
150 psi.
100 psi.
6. Your vehicle has hydraulic brakes. When you press the brake pedal while driving and the pedal goes to the floor, remember that:
shifting into neutral may help slow the vehicle.
pumping the brake pedal may generate enough hydraulic pressure to stop the vehicle.
the parking brake should never used to slow the vehicle.
All of the above.
7. Truck tractors with air brakes built after March 1, 1997, are required to be equipped with:
a rear backup camera.
anti-lock brakes.
hydraulic brakes.
8. If your trucks has a high center of gravity, which of the following is true for curves?
You should slow down, as your truck can roll over at the posted speed limit for the curve.
Reduce your speed to a crawl.
You should travel at the posted speed limit.
None of the above.
9. Combination vehicles usually require _________ single commercial vehicles.
the same level of skill as
more driving skill than
less driving skill than
None of the above.
10. An item that is 15 feet long placed on a flatbed trailer should have at least:
15 tie-downs.
3 tie-downs.
1 tie-down.
2 tie-downs.
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PA CDL Doubles Triples Test

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