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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. You are driving a modern truck with a manual transmission. When going down a hill you should usually:
shift into neutral and coast.
use the same gear you would use to go up the hill.
use a lower gear than would be required to go up the hill.
downshift after your speed has already built up.
2. If your trucks has a high center of gravity, which of the following is true for curves?
You should travel at the posted speed limit.
Reduce your speed to a crawl.
You should slow down, as your truck can roll over at the posted speed limit for the curve.
None of the above.
3. As part of your vehicle inspection, you are checking that air flows to all trailers. After using the trailer handbrake to provide air to the service line, you go to the rear of the rig. When you open the emergency line shut-off valve at the rear of the last trailer, you should hear:
air escaping from the open valve.
the service line valve close.
a thumping sound.
a mechanical vibration.
4. When should you turn the retarder off?
when your vehicle has a high center of gravity.
when the cargo is heavy.
when the road is slippery.
when the cargo is prone to shifting.
5. When backing, it is best to:
back toward the passenger's side when possible.
use a helper whenever possible.
try to back in the direction of the drift.
use only the passenger's side mirror.
6. If the fifth-wheel locking lever is not locked after the jaws close around the kingpin:
the coupling is not right and you should not drive until you get it fixed.
the parking brakes are on and the wheels are chocked.
the parking brakes are on and your vehicle is safe to drive.
cargo is properly blocked.
7. When parking a trailer without spring brakes, it is very important for safety that you use wheel chocks. Why?
You may not notice a major leak in the service line until you try to put the brakes on.
The air could leak out of the trailer air tank, releasing its emergency brakes.
if you don't use wheel chocks, supply air will be sent to the service line instead of going to charge the trailer air tanks.
None of the above.
8. Texting while driving a CMV is:
safer than talking on the phone.
acceptable if the message less than 140 characters.
acceptable if the message work-related.
9. Which of the following is NOT correct? Anti-lock brakes:
require drivers to apply the brakes as hard as they can without locking the wheels.
give drivers more control over the vehicle during braking.
help drivers avoid skids caused by over braking.
help drivers avoid wheel lock up.
10. When a combination vehicle goes around a corner:
the driver must keep the rear of your vehicle far away from the curb.
the front and rear wheels follow a different path.
the rear wheels of the trailer will never off-track.
All of the above.
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NH CDL Doubles Triples Test

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