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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. ABS:
improves your visibility at night.
helps you increase your average speed.
does not decrease your stopping distance.
helps you increase your following distance.
2. To know how much space you should keep in front of you:
estimate how many vehicle lengths there are between you and the vehicle ahead.
estimate how many seconds it would take you to reach the vehicle ahead.
wait until the vehicle ahead of you passes a clear landmark, then count off the seconds until you reach the same spot.
None of the above.
3. Hanging meat in a refrigerated truck:
can be a very unstable load.
creates a low center of gravity.
will not affect safe driving ability.
should never be transported.
4. When the wheels of a trailer lock up, which of the following is most likely to occur?
The rig will stay in a straight line but slide sideways.
The trailer will tend to swing around (trailer jackknife).
The trailer will tend to push the towing vehicle sideways (tractor jackknife).
The trailer will the trailer has overturn.
5. In vehicles with air brakes, the two markings on a front brake limiting valve are:
high and low.
normal and slippery.
wet and dry.
left and right.
6. If you are carrying a heavy load that is slowing you down, you should:
drive on the shoulder.
keep the vehicle in third gear.
drive in the right lane.
drive in the left lane.
7. You should always adjust your speed to be able to stop within:
the length of your vehicle.
the distance you can see ahead.
50 feet.
30 feet.
8. For safe handling, the heaviest trailer should be:
the second trailer in a triple.
behind the tractor.
the last trailer.
None of the above.
9. Over-length loads:
require special transit permits.
require special driving care.
may require special equipment such as "wide load" or flags.
All of the above.
10. Brake lag is:
the amount of air pressure required to stop the vehicle.
the distance your vehicle will continue to travel, in ideal conditions, before you hit the brakes.
the time required for the air brakes to work after the brake pedal is pushed.
the distance your vehicle will travel, in ideal conditions, while you are braking.
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NH Doubles Triples Test

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