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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. Your vehicle should be equipped with all of the following except:
Fire extinguisher
Instructions on how to perform a vehicle inspection test
Warning devices for parked vehicles
Spare electrical fuses
2. When should you downshift automatic transmissions?
When you want to go faster.
Watch your tachometer, and downshift when your engine reaches the top of the range.
When going down steep grades.
When you start to get drowsy.
3. If during vehicle inspection a tire is too hot to touch, you should:
remain stopped until the tire cools off.
make sure there is enough engine oil on the tires.
let air out.
immediately decrease air pressure.
4. If you must stop on a one-way or divided highway, place your warning devices:
10 feet, 100 feet, and 200 feet toward the approaching traffic.
50 feet, 100 feet, and 150 feet toward the approaching traffic.
100 feet, 200 feet, and 300 feet toward the approaching traffic.
10 feet, 50 feet, and 150 feet toward the approaching traffic.
5. The trailer hand valve should:
be used in driving.
never be used for parking.
never be used to test the trailer brakes.
All of the above.
6. Dollies with ABS are required to have a malfunction lamp:
on the rear.
on the left side.
on the right side.
on the front.
7. If your vehicle is equipped with air brakes, loss of air pressure in the emergency line will cause:
the trailer supply valve to open.
the springs to put on the brakes.
the trailer emergency brakes to come on.
the vehicle to slide back and forth.
8. How should you apply the brakes when going down a steep downgrade?
You should not brake, and only use engine braking to prevent brake failure.
Apply the brakes when you reach the bottom of the downgrade.
Apply the brakes whenever you reach your safe speed, until your speed has been reduced to 5 mph below your safe speed.
Apply the brakes as hard as you can without locking the wheels.
9. During a walk around inspection of a double or triple trailer, make sure that the converter dolly air tank drain valve is _____ and the glad hands are ______.
closed; not connected
open; not connected
open; properly connected
closed; properly connected
10. Which of the following is not a braking system on a truck?
Steering brake
Emergency brake
Service brake
Parking brake
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PA CDL Doubles 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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