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DOUBLES TRIPLES TEST NC - CDL PRACTICE 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. If your vehicle has air brakes, to check that air flows to all trailers:
go to the rear of the second trailer and open the emergency line shut-off.
watch each trailer’s air gauge for a drop of 25 psi.
check that the fifth wheel is not so far forward that the tractor frame will hit the landing gear.
pull gently on the trailer with the tractor.
2. Placards are:
a type of safety equipment.
signs put inside a vehicle used to warn others of hazardous materials.
signs placed on a vehicle to identify the hazard class of the cargo.
devices placed below a vehicle to improve traction.
3. To warn drivers behind you when you see you'll need to slow down, you should:
sound your horn.
turn off your lights.
use your headlights.
flash the brake lights.
4. If there is a fire in your vehicle, do NOT:
pull into a service station.
park away from buildings and other vehicles.
park in an open area.
notify emergency services.
5. In vehicles with air brakes, the two markings on a front brake limiting valve are:
high and low.
left and right.
wet and dry.
normal and slippery.
6. Emergency lines are often coded with the color ___ to keep from getting them mixed up with the service line.
white.
blue.
yellow.
red.
7. To prevent rollover, you should do all of the following except:
put the lightest parts of the cargo under the heaviest parts.
drive slowly around turns.
avoid quick lane changes.
keep the load centered on your rig.
8. Air brakes use ________ to make the brakes work.
compressed gas cylinders
compressed air
compressed gases
compressed oil
9. Which of the following is NOT a reason for hydraulic brake failure?
Loss of hydraulic pressure
Brake fade on long hills
Stab braking
All of the above.
10. If a load is 10 feet long, the minimum number of tie-downs required is:
1
2
4
3
 
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NC 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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