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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 Connecticut doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The CT CDL doubles triples test covers the following sections of the Connecticut CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this CT CDL practice test now to prepare for the actual test!
1. Radial and bias-ply tires:
should be used together only during bad weather.
should not be used together.
should be used together only when driving in packed snow.
should be used together.
2. The safety valve installed in the first tank the air compressor pumps air is set to open:
at 30 psi.
every 15 minutes.
if there is too much pressure.
if there is too little pressure.
3. If you are being tailgated, you should:
increase your speed very gradually.
make quick changes.
turn on your taillights.
open up room in front of you.
4. Combination vehicles have __ air lines.
5. When should you be particularly careful about high winds?
When emerging from a tunnel
When driving at night
When driving in winter
When going downhill
6. When inspecting the coupling, make sure the fifth-wheel jaws have closed around the:
the electrical cord.
shank of the kingpin.
head of the kingpin.
the brake camshaft.
7. The center of gravity of a trailer should be:
as low as possible.
at the rear of the trailer.
at the front of the trailer.
as high as possible.
8. Front-end header boards:
should never be used.
reduce traction.
protect drivers from cargo in case of an accident or emergency stop.
protect drivers from spilled cargo.
9. Retarders:
reduce braking distance.
improve gas mileage.
help slow a vehicle, reducing the need for using brakes.
reduce the danger of slipping.
10. When you discover a fire, if the trailer doors are hot you should not open them because:
you should use the fire extinguisher on the door.
the temperature of the trailer should not be changed in any way.
with air many fires do less damage.
opening the doors lets air in and may make the fire flare up.
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CT Doubles Triples Test

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