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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 Vermont doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The VT CDL doubles triples test covers the following sections of the Vermont CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this VT CDL practice test now to prepare for the actual test!
1. "Bobtail" tractors are:
tractors with a tank.
tractors without semitrailers.
tractors with two trailers.
2. When driving with more than one trailer, the _______ trailer should be the first one behind the tractor.
3. When the wheels of a trailer lock up:
the vehicle will gradually come to a complete stop.
the trailer will tend to swing around.
ABS will increase stopping power.
4. Why should you cover your cargo?
To protect the cargo from weather.
To protect people from spilled cargo.
All of the above.
5. If coolant has to be added to a system without a recovery tank, you should:
wait until the engine has cooled before adding coolant.
turn the radiator cap quickly to the first stop.
keep the engine running while adding coolant.
6. When coupling a double or triple, ________ should be attached last.
the trailer right behind the cab.
the middle trailer.
None of the above.
7. When going down a steep downgrade, you should primarily brake using:
the service brakes.
the parking brake.
the braking effect of the engine.
8. Large vehicles take longer to stop when they are:
heavily loaded but not fully loaded.
fully loaded.
9. A bridge formula permits:
less maximum axle weight for axles that are far apart.
less maximum axle weight for axles that are close together.
more maximum axle weight for axles that are closer together.
10. As part of your vehicle inspection, you are checking that air flows to all trailers. After using the trailer handbrake to provide air to the service line, you go to the rear of the rig. When you open the emergency line shut-off valve at the rear of the last trailer, you should hear:
air escaping from the open valve.
a mechanical vibration.
the service line valve close.
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VT Doubles Triples CDL 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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