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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 weight of a truck:
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has an impact on stopping distance.
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is not as important as the vehicle's center of gravity in determining stopping distance.
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has no effect on stopping distance.
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None of the above.
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2.
If coolant has to be added to a system without a recovery tank, you should:
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turn the radiator cap quickly to the first stop.
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keep the engine running while adding coolant.
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wait until the engine has cooled before adding coolant.
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never use thick cloth to touch the radiator cap.
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3.
Dollies manufactured in or after _____ are required to have ABS.
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1973
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2008
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1974
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1998
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4.
Hanging meat in a refrigerated truck:
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should never be transported.
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creates a low center of gravity.
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can be a very unstable load.
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will not affect safe driving ability.
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5.
Which of the following is not a type of retarder?
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Pressure
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Exhaust
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Electric
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Hydraulic
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6.
Glad hands are:
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securement devices.
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warning devices.
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electronic devices.
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coupling devices.
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7.
Older trailers do not have spring brakes. If the air supply leaks away:
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there will be no emergency brakes.
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the ABS won't work properly.
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the trailer will stop normally.
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All of the above.
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8.
When making a turn you should:
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honk your horn.
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make gestures to get the attention of other drivers.
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turn the signal off before entering the turn.
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signal early.
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9.
When the temperature drops:
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bridges usually freeze after other parts of the roadway.
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bridges will freeze before the road will.
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bridges will not freeze.
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None of the above.
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10.
When coupling a double or triple, ________ should be attached last.
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the middle trailer.
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the trailer right behind the cab.
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the more heavily loaded trailer.
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None of the above.
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