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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. Most heavy-duty vehicles use:
hydraulic brakes.
pressure brakes.
air brakes.
solid brakes.
2. You should test the coupling by:
applying the parking brakes so the rig will not move.
pulling against the pin of the second semitrailer.
disconnect the safety chains.
locking the pintle hook.
3. When driving in hot weather, drivers should inspect tires:
every 4 hours or every 200 miles.
every hour or every 50 miles.
every 3 hours or every 75 miles.
every 2 hours or every 100 miles.
4. Air tank drains:
are used to move air to the brakes.
are used to remove water and oil from the air tanks.
should not be used in wet weather.
protect the tanks and the rest of the system from too much pressure.
5. A low air pressure warning signal:
is optional on vehicles with air brakes.
is required on all vehicles without air brakes.
is required on vehicles with air brakes.
None of the above.
6. Tire load is defined as:
the maximum safe weight a tire can carry at a specified pressure.
the minimum tire pressure.
the minimum safe weight a tire can carry at a specified pressure.
the weight transmitted to the ground by 1 tire.
7. The trailer hand valve should be used:
to check that the trailer is locked onto the tractor.
to check that the trailer emergency brakes are on.
to test the trailer brakes.
to check that the fire extinguisher is charged.
8. If the drive wheels start to skid:
push in the clutch to let them turn freely.
use the brakes to slow down.
accelerate slightly to regain control.
All of the above.
9. Over-length loads:
require special driving care.
may require special equipment such as "wide load" or flags.
require special transit permits.
All of the above.
10. The center of gravity of a trailer should be:
as low as possible.
at the rear of the trailer.
at the front of the trailer.
as high as possible.
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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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