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NORTH CAROLINA DOUBLES TRIPLES PRACTICE CDL TEST

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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 North Carolina doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The NC CDL doubles triples test covers the following sections of the North Carolina CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this NC CDL practice test now to prepare for the actual test!
1. Empty trucks require _____ stopping distances because empty vehicles have ______ traction.
greater; less
less; more
less; less
greater; more
2. Which of the following statements about retarders is NOT correct?
Retarders help slow a vehicle, reducing the need for using brakes.
Retarders help you avoid skids.
You should turn the retarder off whenever the road is wet, icy, or snow covered.
Retarders reduce reduce brake wear.
3. If your trucks has a high center of gravity, which of the following is true for curves?
Reduce your speed to a crawl.
You should travel at the posted speed limit.
You should slow down, as your truck can roll over at the posted speed limit for the curve.
None of the above.
4. If a load is 50 feet long, the minimum number of tie-downs required is:
5
4
3
10
5. Combination vehicles usually require _________ single commercial vehicles.
less driving skill than
the same level of skill as
more driving skill than
None of the above.
6. Which of the following road surfaces freezes first?
Open roads
Underpasses
Bridges
Parkings
7. Before driving a vehicle with a dual air system, allow time for the air compressor to build up a minimum of ____ pressure in both the primary and secondary systems.
50 psi
75 psi
25 psi
100 psi
8. The space under a heavily loaded vehicle can be very small. This can cause problems:
on dirt roads.
on unpaved yards.
when crossing railroad tracks.
All of the above.
9. Hydroplaning:
can occur at speeds as low as 30 mph.
can occur at speeds as low as 10 mph, if there is a lot of water.
is less likely if tire pressure is low.
can occur only if there is a lot of water on the road.
10. ABS helps you:
drive faster.
brake harder.
stop faster.
None of the above.
 
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NC Doubles Triples CDL Test

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