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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 Hawaii doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The HI CDL doubles triples test covers the following sections of the Hawaii CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this HI CDL practice test now to prepare for the actual test!
1. When you turn suddenly while pulling doubles, which trailer is most likely to turn over?
The front trailer is twice as likely to turn over as the tractor.
The rear trailer is twice as likely to turn over as the tractor.
All trailers are equally likely to turn over.
2. Too little weight on the driving axles can cause:
poor traction.
mechanical damage.
longer stopping distances.
3. Blocking and bracing are:
used to keep cargo from sliding and to prevent movement of cargo.
coupling devices used to connect the service air lines from the truck or tractor to the trailer.
driving techniques used to regain control when your drive wheels start to skid.
4. After the pre-trip inspection, drivers should inspect their cargo and its securing devices again within ________ after beginning the trip.
25 miles
50 miles
20 miles
5. What is Gross Vehicle Weight?
The total weight of the cargo
The total weight of a single vehicle, excluding its load
The total weight of a single vehicle, including its load
6. The safety valve is usually set to open at:
150 psi.
200 psi.
100 psi.
7. At dawn, dusk, in rain or snow, to make yourself easier to see you should:
use the low beams.
use the high beams.
use the emergency flashers.
8. What factors can cause brakes to fade?
Slippery surfaces and shaded areas.
Dirt roads and in unpaved yards.
Excessive heat and brakes out of adjustment.
9. Too much weight on the steering axle can cause:
better handling.
hard steering and damage to the steering axle and tires.
poor traction.
10. If you doubt you have enough space to pass under a bridge, you should:
go slowly.
drive faster.
turn on your headlights.
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HI CDL Doubles 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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