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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. Pre-trip inspections are:
required only for trips of more than 100 miles.
required only for trips of more than 50 miles.
required by law
2. Air brakes:
are an effective way to stop large and heavy vehicles.
can improve fuel efficiency.
are prohibited on larger vehicles.
should be used only when driving on wet roads.
3. It is safer to drive over (rather than to avoid) which of the following?
Paper and cloth sacks
Plastic containers
Cardboard boxes
None of the above.
4. If you must drive slowly, how should you alert following drivers?
Help them out by signaling when it is safe to pass
Use your emergency flashers if it is legal
Turn on your taillights
Flash your brake lights
5. Combination vehicles have __ air lines.
6. Air brakes use ________ to make the brakes work.
compressed gas cylinders
compressed gases
compressed air
compressed oil
7. When coupling double trailers, if the second trailer does not have spring brakes, to set the trailer emergency brakes you should:
1. Connect the emergency line 2. Charge the trailer air tank. 3. Drive the tractor close to the trailer 4. Disconnect the emergency line.
1. Connect the emergency line 2. Drive the tractor close to the trailer 3. Disconnect the emergency line 4. Charge the trailer air tank.
1. Disconnect the emergency line 2. Drive the tractor close to the trailer 3. Charge the trailer air tank 4. Connect the emergency line.
1. Drive the tractor close to the trailer 2. Connect the emergency line 3. Charge the trailer air tank 4. Disconnect the emergency line.
8. As you approach off ramps and on ramps, remember:
to always brake and turn at the same time.
that the posted speed limit may not be safe for larger vehicles.
to maintain your highway speed.
that downgrades make it easier to reduce speed.
9. An ABS system:
requires a change in the way you brake.
is a safety anti-skid braking system.
decreases your stopping distance.
helps increase a vehicle's stopping power.
10. If your vehicle is equipped with air brakes, loss of air pressure in the emergency line will cause:
the vehicle to slide back and forth.
the springs to put on the brakes.
the trailer emergency brakes to come on.
the trailer supply valve to open.
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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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