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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. You should always try to back toward the driver's side because:
you can watch the rear of your vehicle out the side window.
backing toward the left side is more dangerous.
you can more easily correct any steering errors.
None of the above.
2. Brake lag is:
the distance your vehicle will travel, in ideal conditions, while you are braking.
the amount of air pressure required to stop the vehicle.
the time required for the air brakes to work after the brake pedal is pushed.
the distance your vehicle will continue to travel, in ideal conditions, before you hit the brakes.
3. At dawn, dusk, in rain or snow, to make yourself easier to see you should:
use the parking lights.
use the low beams.
use the high beams.
use the emergency flashers.
4. Emergency brakes are:
required on all vehicles.
not required on doubles.
not required on buses.
not required on commercial vehicles with air brakes.
5. When checking the lights before driving:
you should check them from inside the vehicle.
make sure the parking brake is not set.
the engine must be running.
you should turn off the engine.
6. When the temperature drops:
bridges usually freeze after other parts of the roadway.
bridges will not freeze.
bridges will freeze before the road will.
None of the above.
7. When inspecting the coupling, make sure the fifth-wheel jaws have closed around the:
head of the kingpin.
the electrical cord.
the brake camshaft.
shank of the kingpin.
8. Which of the following is not a sign of fatigue?
Yawning repeatedly
Frequent blinking
Rubbing eyes
Keeping a steady speed
9. The trolley valve should be used only:
to test the trailer brakes.
in an emergency.
to prevent skids.
in driving.
10. When coupling, you should:
make sure the trailer wheels are not chocked.
make sure the trailer kingpin is bent.
make sure the sliding fifth-wheel is locked.
be aware that wrong coupling and uncoupling can be very dangerous.
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KY CDL Doubles Test

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