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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 Kentucky doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The KY CDL doubles triples test covers the following sections of the Kentucky CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this KY CDL practice test now to prepare for the actual test!
1. Large vehicles take longer to stop when they are:
fully loaded.
carrying hazardous materials.
heavily loaded but not fully loaded.
2. A trailer jackknife is more likely to happen when the trailer is:
loaded to its full capacity.
None of the above.
3. 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.
the parking brake should never used to slow the vehicle.
pumping the brake pedal may generate enough hydraulic pressure to stop the vehicle.
All of the above.
4. Excessive use of the service brakes results in overheating. Too much heat can:
cause the brakes apply unevenly.
cause the brakes to squeak.
cause the brakes to grab.
make the brakes stop working.
5. Before driving a vehicle with a dual brake brake system, the driver should:
wait at least 5 minutes before driving.
pump the brake pedal 10 times to build pressure.
wait at least 10 minutes before driving.
allow time for the air compressor to build up a minimum of 100 psi pressure in both the primary and secondary systems.
6. 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.
All of the above.
7. To know how much space you should keep in front of you when driving at speeds below 40 mph, one good rule says you need at least ______ for each ______ of vehicle length.
1 second; 5 feet
3 seconds; 50 feet
2 seconds; 10 feet
1 second; 10 feet
8. Why should you cover your cargo?
To protect the cargo from weather.
Because spill protection is a safety requirement in many states.
To protect people from spilled cargo.
All of the above.
9. Which of the following is a reason to cover cargo?
To contain a spill
To protect people from spilled cargo
To protect the cargo from weather
All of the above.
10. On any upgrade, gravity:
speed you up.
doubles your speed.
doesn't affect your speed.
slows you down.
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Doubles Triples KY CDL Test

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