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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 New Hampshire doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The NH CDL doubles triples test covers the following sections of the New Hampshire CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this NH CDL practice test now to prepare for the actual test!
1. Which of the following may have reduced the clearances since the heights were posted at bridges and overpasses?
Repaving of the road
The weight of a cargo
2. Before driving a vehicle with a dual air system, allow time for the air compressor to build up a minimum of ____ pressure in both the primary and secondary systems.
25 psi
100 psi
50 psi
75 psi
3. When coupling double trailers, you can secure the second trailer by:
setting the trailer emergency brakes.
using the trailer spring brakes.
chocking the wheels.
All of the above.
4. If coolant has to be added to a system without a recovery tank, you should:
turn the radiator cap quickly to the first stop.
wait until the engine has cooled before adding coolant.
keep the engine running while adding coolant.
never use thick cloth to touch the radiator cap.
5. Combination vehicles usually require _________ single commercial vehicles.
the same level of skill as
less driving skill than
more driving skill than
None of the above.
6. Combination vehicles usually:
require more driving skill than single CMVs.
are easier to drive than single than single CMVs.
are shorter than single than single CMVs.
All of the above.
7. If brakes fail on a long downgrade, you should:
turn off the engine as soon as you.
pump the brake pedal 3 times.
set the parking brake.
use an escape ramp if it is available.
8. When you back under a trailer:
back the tractor slowly.
make sure the trailer brakes are locked.
use lowest reverse gear.
All of the above.
9. When the spring brakes are on, you should:
pump the brakes.
exceed the posted speed limit.
press the accelerator.
not push the brake pedal down.
10. Which of the following is not proper tie-down equipment:
Bungee cords
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Doubles Triples NH CDL Test

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