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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 Kansas doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The KS CDL doubles triples test covers the following sections of the Kansas CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this KS CDL practice test now to prepare for the actual test! Important: Triple trailers are not legal in Kansas.
1. The tractor protection valve:
controls the emergency brakes on combination vehicles.
works the trailer brakes.
keeps air in the tractor brake system should the trailer break away or develop a bad leak.
supplies air to the trailer air tanks.
2. To know if your vehicle is equipped with ABS, look for:
the ABS logo on the steering wheel.
a yellow ABS malfunction lamps on the instrument panel.
an ABS placard.
the ABS shipping paper.
3. The trailer hand valve should:
never be used for parking.
be used in driving.
never be used to test the trailer brakes.
All of the above.
4. Driving in very hot weather:
can increase tire pressure.
can decrease oil pressure.
can make it difficult to stay in your lane.
should never be done.
5. Watch out for black ice:
when it is snowing.
right after it starts to rain.
any time the temperature is below freezing and the road looks wet.
when the temperature is above freezing and the road is dry.
6. When making a turn you should:
turn the signal off before entering the turn.
signal early.
honk your horn.
make gestures to get the attention of other drivers.
7. If your vehicle is hydroplaning, you should:
speed up.
put the vehicle in reverse.
stay off the brake.
apply the brakes.
8. When should you downshift automatic transmissions?
When you start to get drowsy.
Watch your tachometer, and downshift when your engine reaches the top of the range.
When you want to go faster.
When going down steep grades.
9. Front-end header boards:
should never be used.
reduce traction.
protect drivers from spilled cargo.
protect drivers from cargo in case of an accident or emergency stop.
10. With the controlled braking method:
you lightly tap the brakes.
you apply your brakes as hard as possible without locking the wheels.
you use the parking brake to lock the wheels.
you apply your brakes all the way and release the brakes when the wheels lock up.
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KS Doubles Triples 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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