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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. Hydroplaning:
can occur at speeds as low as 30 mph.
can occur only if there is a lot of water on the road.
can occur at speeds as low as 10 mph, if there is a lot of water.
is less likely if tire pressure is low.
2. To reduce the chance of rollover, you should:
distributed the cargo as low as possible inside the trailer.
place the cargo as high as possible inside the trailer.
put the lightest parts of the cargo under the heaviest parts.
None of the above.
3. When inspecting the coupling, make sure the fifth-wheel jaws have closed around the:
the electrical cord.
head of the kingpin.
shank of the kingpin.
the brake camshaft.
4. When more cargo is piled up in a truck, the center of gravity moves:
to the left side of the truck.
to the right side of the truck.
closer to the ground.
higher up from the road.
5. Empty trucks:
require a shorter stopping distance than full trucks.
require a greater stopping distance than full trucks.
require the same stopping distance than full trucks.
None of the above.
6. Doubles and triples:
have a lower chance of skidding.
can be stopped suddenly due to their weight.
can't be turned suddenly.
can be turned suddently due to the low center of gravity.
7. When making a turn you should:
honk your horn.
make gestures to get the attention of other drivers.
signal early.
turn the signal off before entering the turn.
8. In a combination vehicle, ________ is most likely to turn over.
the last trailer
the trailer behind the tractor
the tractor
All of the above.
9. When coupling, you should:
make sure the trailer wheels are not chocked.
make sure the sliding fifth-wheel is locked.
be aware that wrong coupling and uncoupling can be very dangerous.
make sure the trailer kingpin is bent.
10. After the pre-trip inspection, drivers should inspect their cargo and its securing devices again within ________ after beginning the trip.
25 miles
two hours
50 miles
20 miles
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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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