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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. Enough tread is especially important in winter conditions. You need at least ________ tread depth on steering axle tires.
6/24 inch
2/8 inch
8/32 inch
4/32 inch
2. Regardless of its size, cargo should have at least ___ tie-downs.
3
4
2
1
3. You have two tie-downs on a 15 foot load. How many more tie-downs do you need to secure cargo and keep it from shifting or falling?
Three
None
Two
One
4. To test your parking brake, do the following:
Speed up to 15 mph, then set the parking brake.
Set the parking brake, and gently pull against it in a low gear.
Set the parking brake while going downhill.
Speed up to 5 mph, then set the parking brake.
5. The safety valve is usually set to open at:
75 psi.
200 psi.
150 psi.
100 psi.
6. Cargo should be properly covered:
to protect the weather from the cargo.
to protect people from spilled cargo.
to block your view or someone else’s.
All of the above.
7. You should always try to back toward the driver's side because:
you can watch the rear of your vehicle out the side window.
backing toward the left side is more dangerous.
you can more easily correct any steering errors.
None of the above.
8. Containerized loads are used:
when transporting liquids.
when the cargo exceeds the weight limit.
when transporting explosives.
when the cargo has been or will be carried by rail or ship.
9. With the controlled braking method:
you use the parking brake to lock the wheels.
you lightly tap the brakes.
you apply your brakes as hard as possible without locking the wheels.
you apply your brakes all the way and release the brakes when the wheels lock up.
10. To know how much space you should keep in front of you when driving at speeds below 40 mph, one good rule says you need at least ______ for each ______ of vehicle length.
1 second; 5 feet
2 seconds; 10 feet
1 second; 10 feet
3 seconds; 50 feet
 
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NH CDL Doubles Test

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